Quantitative Master Series N-CSR Certified annual shareholder report (management investment company)

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-CSR

CERTIFIED SHAREHOLDER REPORT OF REGISTERED MANAGEMENT INVESTMENT COMPANIES

Investment Company Act file number: 811-07899 and 811-07885

Name of Fund: BlackRock Index Funds, Inc.

        iShares MSCI EAFE International Index Fund

        iShares Russell 2000 Small-Cap Index Fund

Quantitative Master Series LLC

        Master Small Cap Index Series

Fund Address: 100 Bellevue Parkway, Wilmington, DE 19809

Name and address of agent for service: John M. Perlowski, Chief Executive Officer, BlackRock Index Funds, Inc. and Quantitative Master Series LLC, 55 East 52^nd Street, New York, NY 10055

Registrants’ telephone number, including area code: (800) 441-7762

Date of fiscal year end: 12/31/2021

Date of reporting period: 12/31/2021

Item 1 – Report to Stockholders

(a) The Report to Shareholders is attached herewith.

DECEMBER 31, 2021

2021 Annual Report

BlackRock Funds^SM

· iShares Municipal Bond Index Fund

· iShares Short-Term TIPS Bond Index Fund

BlackRock Index Funds, Inc.

· iShares MSCI EAFE International Index Fund

· iShares Russell 2000 Small-Cap Index Fund

    Not FDIC Insured • May Lose Value • No Bank Guarantee         

The Markets in Review

Dear Shareholder,

The 12-month reporting period as of December 31, 2021 saw a continuation of the resurgent growth that followed the initial coronavirus (or “COVID-19”) pandemic reopening, albeit at a slower pace. The global economy weathered the emergence of several variant strains and the resulting peaks and troughs in infections amid optimism that increasing vaccinations and economic adaptation could help contain the pandemic’s disruptions. Continued growth meant that the U.S. economy regained and then surpassed its pre-pandemic output. However, a rapid rebound in consumer spending pushed up against supply constraints and led to elevated inflation.

Equity prices rose with the broader economy, as the implementation of mass vaccination campaigns and passage of an additional fiscal stimulus package and infrastructure bill further boosted stocks. In the United States, both large-and small-capitalization stocks posted a strong advance, and many equity indices neared or surpassed all-time highs late in the reporting period. International equities from developed markets also gained, although emerging market stocks declined, pressured by a strengthening U.S. dollar.

The 10-year U.S. Treasury yield (which is inversely related to bond prices) rose during the reporting period as the economy expanded rapidly and inflation reached its highest annualized reading in decades. In the corporate bond market, support from the U.S. Federal Reserve (the “Fed”) assuaged credit concerns and led to solid returns for high-yield corporate bonds, outpacing investment-grade corporate bonds, which declined.

The Fed maintained accommodative monetary policy during the reporting period by maintaining near-zero interest rates and by asserting that inflation could exceed its 2% target for a sustained period without triggering a rate increase. However, the Fed’s tone shifted late in the year, as it reduced its bond-buying program and used its market guidance to raise the prospect of higher rates in 2022.

Looking ahead, we believe that the global expansion will continue to broaden as Europe and other developed market economies gain momentum, although the Delta and Omicron variants of the coronavirus remain a threat, particularly in emerging markets. While we expect inflation to abate somewhat as supply bottlenecks are resolved, we anticipate that inflation will remain higher than the pre-COVID norm. The Fed is poised to raise interest rates next year in response, but the Fed’s policy shift means that tightening is likely to be less aggressive than what we’ve seen in previous cycles.

In this environment, we favor an overweight to equities, as we believe low interest rates and continued economic growth will support further gains, albeit likely more modest than what we saw in 2021. Sectors that are better poised to manage the transition to a lower-carbon world, such as technology and health care, are particularly attractive in the long term. U.S. and other developed-market equities have room for further growth, while we believe Chinese equities stand to gain from a more accommodative monetary and fiscal environment as the Chinese economy slows. We are underweight long-term credit, but inflation-protected U.S. Treasuries, Asian fixed income, and emerging market local-currency bonds offer potential opportunities. We believe that international diversification and a focus on sustainability can help provide portfolio resilience, and the disruption created by the coronavirus appears to be accelerating the shift toward sustainable investments.

In this environment, our view is that investors need to think globally, extend their scope across a broad array of asset classes, and be nimble as market conditions change. We encourage you to talk with your financial advisor and visit blackrock.com for further insight about investing in today’s markets.

Sincerely,

Rob Kapito

President, BlackRock Advisors, LLC

Rob Kapito

President, BlackRock Advisors, LLC

Total Returns as of December 31, 2021
	6-Month	12-Month
U.S. large cap equities (S&P 500® Index)	11.67%	28.71%
U.S. small cap equities (Russell 2000® Index)	(2.31)	14.82
International equities (MSCI Europe, Australasia, Far East Index)	2.24	11.26
Emerging market equities (MSCI Emerging Markets Index)	(9.30)	(2.54)
3-month Treasury bills (ICE BofA 3-Month U.S. Treasury Bill Index)	0.02	0.05
U.S. Treasury securities (ICE BofA 10-Year U.S. Treasury Index)	0.44	(3.68)
U.S. investment grade bonds (Bloomberg U.S. Aggregate Bond Index)	0.06	(1.54)
Tax-exempt municipal bonds (S&P Municipal Bond Index)	0.52	1.77
U.S. high yield bonds (Bloomberg U.S. Corporate High Yield 2% Issuer Capped Index)	1.59	5.26
Past performance is not an indication of future results. Index performance is shown for illustrative purposes only. You cannot invest directly in an index.

2 THIS   PAGE   IS   NOT   PART   OF   YOUR   FUND   REPORT

Table of Contents

	Page
The Markets in Review		2
Annual Report:
Fund Summary		4
About Fund Performance		15
Disclosure of Expenses		16
Derivative Financial Instruments		16
Fund Financial Statements:
Fund Schedules of Investments		17
Fund Statements of Assets and Liabilities		36
Fund Statements of Operations		38
Fund Statements of Changes in Net Assets		40
Fund Financial Highlights		42
Fund Notes to Financial Statements		57
Fund Report of Independent Registered Public Accounting Firm		71
Important Tax Information		72
Series Portfolio Information		73
Series Financial Statements:
Series Schedule of Investments		74
Series Statement of Assets and Liabilities		98
Series Statement of Operations		99
Series Statements of Changes in Net Assets		100
Series Financial Highlights		101
Series Notes to Financial Statements		102
Series Report of Independent Registered Public Accounting Firm		110
Statement Regarding Liquidity Risk Management Program		111
Director and Officer Information		112
Additional Information		117
Glossary of Terms Used in this Report		119

3

Fund Summaryas of December  31, 2021  iShares Municipal Bond Index Fund

Investment Objective

iShares Municipal Bond Index Fund’s (the “Fund”) investment objective is to seek to provide investment results that correspond to the total return performance of fixed-income securities in the aggregate, as represented by the ICE BofA US Municipal Securities Index (the “Underlying Index”).

Portfolio Management Commentary

How did the Fund perform?

For the 12-month period ended December 31, 2021, the Fund’s Institutional Shares returned 1.54%, Investor A Shares returned 1.28%, Investor P Shares returned 1.29%, and Class K Shares returned 1.58%. The Fund’s benchmark, the ICE BofA US Municipal Securities Index, returned 1.83% for the same period.

Returns for the Fund’s respective share classes differ from the benchmark indexes based on individual share-class expenses.

Describe the market environment.

The global markets in 2021 began the process of recovery from the COVID-19 pandemic and geopolitical uncertainty. The year started with a positive tone for risk assets as vaccines were rolled out and signs of recovery emerged. The reopening of the economy, continued government stimulus and a dovish Fed contributed to a risk-on environment in the first half of the year. The Fed maintained its exceptionally accommodative stance through most of 2021 as the economy continued to recover with minor setbacks due to the COVID-19 Delta and, more recently, the COVID-19 Omicron variant. The U.S. unemployment rate trended downward throughout the year, beginning at 6.4% in January and ending the year at 3.9%.

As the economy showed continued signs of recovery and inflation remained elevated, the Fed began tapering its asset purchases in November 2021. The final Federal Open Market Committee (“FOMC”) meeting of the year, held in December 2021, announced a doubling in the pace of tapering. At the new pace, the Fund will wrap up its asset purchases in the middle of March 2022, and the expectation is that fed funds rate hikes will follow shortly thereafter. This was reflected in the December Summary of Economic Projections and “dot plot” that showed that FOMC participants anticipate that three increases in the Fed’s benchmark overnight lending rate will be appropriate in 2022. The 10-year U.S. Treasury yield rose by 59 basis points (0.59%) to 1.52% at year end.

Municipal bonds outperformed comparable-maturity U.S. Treasuries for the year on strong credit fundamentals and as U.S. Treasury yields were more directly impacted by the prospect of Fed tightening.

Describe recent portfolio activity.

During the period, the Fund maintained its objective of seeking to provide investment results that correspond to the total return performance of the Underlying Index by selecting securities in accordance with their relative proportion within the Underlying Index. Other factors considered in security selection included transaction costs and maturity.

Describe portfolio positioning at period end.

The Fund remained positioned to attempt to match the risk characteristics of the Underlying Index, irrespective of the market’s future direction.

The views expressed reflect the opinions of BlackRock as of the date of this report and are subject to change based on changes in market, economic or other conditions. These views are not intended to be a forecast of future events and are no guarantee of future results.

4 2 0 2 1   BLACK ROCK   ANNUAL   REPORT   TO   SHAREHOLDERS

Fund Summary   as of December 31, 2021 (continued) iShares Municipal Bond Index Fund

TOTAL RETURN BASED ON A $10,000 INVESTMENT

^(a) Assuming transaction costs and other operating expenses, including administration fees, if any. On November 19, 2018, the Fund acquired all of the assets and assumed certain stated liabilities of the State Farm Tax Advantaged Bond Fund (the “Predecessor Fund”), a series of State Farm Mutual Fund Trust, through a tax-free reorganization (the “Reorganization”). The Predecessor Fund is the performance and accounting survivor of the Reorganization; accordingly the Fund assumed the performance and financial history of the Predecessor Fund upon completion of the Reorganization.

^(b) The Fund generally invests at least 80% of its assets, plus the amount of any borrowings for investment purposes, in securities or other financial instruments that are components of or have economic characteristics similar to the securities in the Underlying Index.

^(c) An index that tracks the performance of U.S. dollar denominated investment grade tax-exempt debt publicly issued by U.S. states and territories, and their political subdivisions, in the U.S. domestic market.

Performance

							Average Annual Total Returns(a)
							1 Year						5 Years						10 Years
	Standardized 30-Day Yields			Unsubsidized 30-Day Yields			Without Sales Charge			With Sales Charge			Without Sales Charge			With Sales Charge			Without Sales Charge			With Sales Charge
Institutional		0.79	%		0.78	%		1.54	%		N/A			3.79	%		N/A			3.21	%		N/A
Investor A		0.53			0.50			1.28			N/A			3.62			N/A			3.13			N/A
Investor P		0.52			0.52			1.29			(2.77	)%		3.62			2.78	%		3.12			2.70	%
Class K		0.83			0.77			1.58			N/A			3.81			N/A			3.22			N/A
ICE BofA US Municipal Securities Index		—			—			1.83			N/A			4.23			N/A			3.88			N/A

^(a) Assuming maximum sales charges, if any. Average annual total returns with and without sales charges reflect reductions for distribution and service fees. See “About Fund Performance” for a detailed description of share classes, including any related sales charges and fees, and how performance was calculated for certain share classes. On November 19, 2018, the Fund acquired all of the assets and assumed certain stated liabilities of the State Farm Tax Advantaged Bond Fund (the “Predecessor Fund”), a series of State Farm Mutual Fund Trust, through a tax-free reorganization (the “Reorganization”). The Predecessor Fund is the performance and accounting survivor of the Reorganization; accordingly the Fund assumed the performance and financial history of the Predecessor Fund upon completion of the Reorganization.

N/A — Not applicable as the share class and index do not have a sales charge.

Past performance is not an indication of future results.

Performance results may include adjustments made for financial reporting purposes in accordance with U.S. generally accepted accounting principles.

Expense Example

	Actual							Hypothetical(a)
	Beginning		Ending		Expenses			Beginning		Ending		Expenses			Annualized
	Account Value		Account Value		Paid During			Account Value		Account Value		Paid During			Expense
		(07/01/21)		(12/31/21)		the Period	(b)		(07/01/21)		(12/31/21)		the Period	(b)		Ratio
Institutional		$         1,000.00		$         1,003.20		$          1.21			$         1,000.00		$         1,024.00		$          1.22			0.24	%
Investor A		1,000.00		1,001.90		2.52			1,000.00		1,022.68		2.55			0.50
Investor P		1,000.00		1,001.90		2.47			1,000.00		1,022.74		2.50			0.49
Class K		1,000.00		1,003.40		1.01			1,000.00		1,024.20		1.02			0.20

^(a) Hypothetical 5% annual return before expenses is calculated by prorating the number of days in the most recent fiscal half year divided by 365.

^(b) For each class of the Fund, expenses are equal to the annualized expense ratio for the class, multiplied by the average account value over the period, multiplied by 184/365 (to reflect the one-half year period shown).

See “Disclosure of Expenses” for further information on how expenses were calculated.

FUND   SUMMARY 5

Fund Summary   as of December 31, 2021 (continued) iShares Municipal Bond Index Fund

Portfolio Information

SECTOR ALLOCATION
Sector(a)(b)	Percent of Total Investments
State		31	%
Transportation		26
County/City/Special District/School District		16
Utilities		16
Health		6
Education		4
Tobacco		1

CALL/MATURITY SCHEDULE
Calendar Year Ended December 31,(a)(c)	Percentage
2022		8	%
2023		9
2024		8
2025		11
2026		16

CREDIT QUALITY ALLOCATION
Credit Rating(a)(d)	Percent of Total Investments
AAA/Aaa		21	%
AA/Aa		55
A		17
BBB/Baa		6
N/R(e)		1

^(a) Excludes short-term securities.

^(b) For Fund compliance purposes, the Fund’s sector classifications refer to one or more of the sector sub-classifications used by one or more widely recognized market indexes or rating group indexes, and/or as defined by the investment adviser. These definitions may not apply for purposes of this report, which may combine such sector sub-classifications for reporting ease.

^(c) Scheduled maturity dates and/or bonds that are subject to potential calls by issuers over the next five years.

^(d) For financial reporting purposes, credit quality ratings shown above reflect the highest rating assigned by either S&P Global Ratings or Moody’s Investors Service, Inc. if ratings differ. These rating agencies are independent, nationally recognized statistical rating organizations and are widely used. Investment grade ratings are credit ratings of BBB/Baa or higher. Below investment grade ratings are credit ratings of BB/Ba or lower. Investments designated N/R are not rated by either rating agency. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change.

^(e) The investment adviser evaluates the credit quality of unrated investments based upon certain factors including, but not limited to, credit ratings for similar investments and financial analysis of sectors and individual investments. Using this approach, the investment adviser has deemed certain of these unrated securities as investment grade quality. As of December 31, 2021, the market value of unrated securities deemed by the investment adviser to be investment grade represents less than 1% of the Fund’s total investments.

6 2 0 2 1   BLACK ROCK   ANNUAL   REPORT   TO   SHAREHOLDERS

Fund Summary   as of December 31, 2021  iShares Short-Term TIPS Bond Index Fund

Investment Objective

iShares Short-Term TIPS Bond Index Fund’s (the “Fund”) investment objective is to seek to track the investment results of an index composed of U.S. 0-5 Year Treasury Inflation-Protected Securities.

Portfolio Management Commentary

How did the Fund perform?

For the 12-month period ended December 31, 2021, the Fund’s Institutional Shares returned 5.18%, Investor A Shares returned 4.89%, and Class K Shares returned 5.19%. The Fund’s benchmark, the Bloomberg U.S. Treasury Inflation-Protected Securities (TIPS) 0-5 Years Index (Series-L), the (“Underlying Index”), returned 5.34% for the same period.

On December 31, 2021, Bloomberg priced the Fund’s benchmark index at 1 pm EST while BlackRock funds priced at 4 pm EST. This event caused some pricing noise and underperformance across both the index and active books, including the iShares Short Term TIPS Index Fund, when looking at the official return. This effect was offset on January 3, 2022 as the benchmark reverted to 4 pm EST pricing.

What factors influenced performance?

Prices for Treasury inflation-protected securities (“TIPS”) are influenced by changes in inflation expectations as well as the direction of nominal U.S. Treasury yields. For the 12-month period, the Bloomberg US TIPS Index posted a return of 5.96% while the Fund’s benchmark, the Bloomberg U.S. TIPS 0-5 Years Index, returned 5.34%, with returns for both indexes limited by rising longer-term nominal U.S. Treasury yields.

The global markets in 2021 began the process of recovery from the COVID-19 pandemic and geopolitical uncertainty. The year started with a positive tone for risk assets as vaccines were rolled out and signs of recovery emerged. The reopening of the economy, continued government stimulus and a dovish Fed contributed to a risk-on environment in the first half of the year. The Fed maintained its exceptionally accommodative stance through most of 2021 as the economy continued to recover with minor setbacks due to the COVID-19 Delta variant and, more recently, the COVID-19 Omicron variant. The U.S. unemployment rate trended downward throughout the year, beginning at 6.4% in January and ending the year at 3.9%.

As the economy showed continued signs of recovery and inflation remained elevated, the Fed began tapering its asset purchases in November 2021. The final Federal Open Market Committee (“FOMC”) meeting of the year, held in December 2021, announced a doubling in the pace of tapering. At the new pace, the Fund will wrap up its asset purchases in the middle of March 2022, and the expectation is that fed funds rate hikes will follow shortly thereafter. This was reflected in the December Summary of Economic Projections and “dot plot” that showed that FOMC participants anticipate that three increases in the Fed’s benchmark overnight lending rate will be appropriate in 2022. The 10-year U.S. Treasury yield rose by 59 basis points (0.59%) over the 12 months to 1.52% at year end.

Describe recent portfolio activity.

During the period, the Fund maintained its objective of seeking to provide investment results that correspond to the total return performance of the Underlying Index by selecting securities in accordance with their relative proportion within the Underlying Index. Other factors considered in security selection included transaction costs and maturity.

Describe portfolio positioning at period end.

The Fund remains positioned to attempt to match the risk and return characteristics of the Underlying Index, irrespective of the future direction of inflation expectations.

The views expressed reflect the opinions of BlackRock as of the date of this report and are subject to change based on changes in market, economic or other conditions. These views are not intended to be a forecast of future events and are no guarantee of future results.

FUND   SUMMARY 7

Fund Summary   as of December 31, 2021 (continued) iShares Short-Term TIPS Bond Index Fund

TOTAL RETURN BASED ON A $10,000 INVESTMENT

The Fund commenced operations on February 16, 2016.

^(a) Assuming transaction costs and other operating expenses, including investment advisory fees, if any.

^(b) The Fund generally invests at least 90% of its assets, plus the amount of any borrowing for investment purposes, in securities of the Underlying Index. From time to time when conditions warrant, however, the Fund may invest at least 80% of its assets in securities of the Underlying Index. The Fund may invest a portion of the remainder of its assets in securities not included in the Underlying Index, but which BlackRock Advisors, LLC believes will help the Fund track the Underlying Index.

^(c) Bloomberg U.S. Treasury Inflation-Protected Securities (TIPS) 0-5 Years Index (Series-L) (formerly Bloomberg Barclays U.S. Treasury Inflation-Protected Securities (TIPS) 0-5 Years Index (Series-L), an index that measures the performance of the inflation-protected public obligations of the U.S. Treasury that have a remaining maturity of less than five years.

Performance

	Average Annual Total Returns(a)
		1 Year		5 Years		Since Inception	(b)
Institutional		5.18	%	3.21	%	3.16	%
Investor A		4.89		2.96		2.89
Class K		5.19		3.23		3.18
Bloomberg U.S. Treasury Inflation-Protected Securities (TIPS) 0-5 Years Index (Series-L)		5.34		3.32		3.28

^(a) Average annual total returns reflect reductions for distribution and service fees. See “About Fund Performance” for a detailed description of share classes, including any related fees.

^(b) The Fund commenced operations on February 16, 2016.

Past performance is not an indication of future results.

Performance results may include adjustments made for financial reporting purposes in accordance with U.S. generally accepted accounting principles.

Expense Example

	Actual						Hypothetical(a)
		Beginning Account Value (07/01/21)		Ending Account Value (12/31/21)	Expenses Paid During the Period	(b)		Beginning Account Value (07/01/21)	Ending Account Value (12/31/21)	Expenses Paid During the Period	(b)	Annualized Expense Ratio
Institutional		$       1,000.00		$       1,024.00	$          0.36			$       1,000.00	$       1,024.85	$          0.36		0.07	%
Investor A		1,000.00		1,022.60	1.84			1,000.00	1,023.39	1.84		0.36
Class K		1,000.00	��	1,024.10	0.31			1,000.00	1,024.90	0.31		0.06

^(a) Hypothetical 5% annual return before expenses is calculated by prorating the number of days in the most recent fiscal half year divided by 365.

^(b) For each class of the Fund, expenses are equal to the annualized expense ratio for the class, multiplied by the average account value over the period, multiplied by 184/365 (to reflect the one-half year period shown).

See “Disclosure of Expenses” for further information on how expenses were calculated.

8 2 0 2 1   BLACK ROCK   ANNUAL   REPORT   TO   SHAREHOLDERS

Fund Summary   as of December 31, 2021 (continued) iShares Short-Term TIPS Bond Index Fund

Portfolio Information

ALLOCATION BY MATURITY

Period	Percent of Total Investments	(a)
0-1 Year	13	%
1-2 Years	21
2-3 Years	21
3-4 Years	26
4-5 Years	19

^(a) Exclude short-term securities.    

FIVE LARGEST FUND HOLDINGS

Holding	Percent of Total Investments
U.S. Treasury Inflation Protected Security, 0.13%, 01/15/2023		8	%
U.S. Treasury Inflation Protected Security, 0.13%, 10/15/2025		7
U.S. Treasury Inflation Protected Security, 0.38%, 07/15/2023		7
U.S. Treasury Inflation Protected Security, 0.25%, 01/15/2025		6
U.S. Treasury Inflation Protected Security, 0.38%, 07/15/2025		6

FUND   SUMMARY 9

Fund Summary   as of December 31, 2021 iShares MSCI EAFE International Index Fund

Investment Objective

iShares MSCI EAFE International Index Fund’s (the “Fund”) investment objective is to match the performance of the MSCI EAFE Index (Europe, Australasia, Far East) (the “MSCI EAFE Index”) in U.S. dollars with net dividends as closely as possible before the deduction of Fund expenses.

Portfolio Management Commentary

How did the Fund perform?

For the 12-month period ended December 31, 2021, the Fund’s Institutional Shares returned 11.28%, Investor A Shares returned 11.01%, Investor P Shares returned 11.05%, and Class K Shares returned 11.33%. The MSCI EAFE Index returned 11.26% for the same period.

Returns for the Fund’s respective share classes differ from the benchmark index based on individual share-class expenses.

Describe the market environment.

The vaccination rollout in developed markets during the first quarter of 2021 boosted optimism for a global economic recovery. However, the reappearance of high numbers of daily COVID-19 cases across Europe weighed down on the general sentiment, especially as social restrictions were tightened again across Europe.

After a relatively slow start in the second quarter of 2021, the vaccination rate across developed markets picked up, leading to more economic activities restarting. The prospect for strong growth, signaled by strong economic data, also boosted European equities over the quarter. Strong corporate earnings in Europe supported market performance as companies benefited from a combination of demand recovery and supply constraints. Services increased over the quarter, as the ease of COVID-19 restrictions helped fuel higher demand. However, despite the improving economic outlook, the European Central Bank policy makers signaled that it was still too soon to withdraw stimulus measures, while despite the Bank of England announcing its plans to slow its quantitative easing program.

In Japan, the consistent increase in COVID-19 cases led the government to extend the state of emergency until June 20, 2021. While market performance was initially weighed down by the slow vaccination campaign, the market began to rally in the second quarter of 2021 as the government rolled out mass vaccination efforts throughout the country. The Japanese equity market started to recover by the end of May, but investors’ concerns over the low vaccination rate persisted, resulting in slight negative performance for the quarter.

In the third quarter of 2021, the COVID-19 pandemic continued to have a negative impact on economic recovery, but to a lesser degree in developed countries as vaccination rates increased. However, concerns regarding inflation, supply chain disruption, and rising energy prices hindered developed markets’ performance.

In Europe, strong earnings reports and easing of restrictions boosted market performance, and many economies began to recover in the first two months of the third quarter. However, an increase in energy prices due to energy shortages, along with concerns of inflation and supply chain disruption, hindered market performance and gross domestic product growth.

In Asia, the concerns regarding the debt crisis of the Chinese property developer Evergrande dampened market performance, especially in Hong Kong. The Japanese market continued its recovery throughout the third quarter of 2021 despite the state of emergency implemented in Tokyo. Japanese equities were supported by strong earnings reports and increased hopes of stimulus and economic reopening, as COVID-19 cases declined.

During the fourth quarter of 2021, developed non-U.S. equity markets posted a gain in October on the back of strong corporate earnings reports and robust economic data. However, the emergence of the new COVID-19 Omicron variant dampened markets performance in November and put pressure on central banks as they faced rising inflation rates on the back of supply chain disruptions. In December, markets rebounded as the new variant was reported to be less severe than expected despite higher transmissibility.

In Europe, the market recovered in December 2021 after concerns regarding the Omicron variant were lessened. The European Central Bank committed to end the emergency bond buying program in March 2022 but promised to keep low borrowing costs over 2022 and to keep the door open for restarting emergency support in the event of turbulence. On the other hand, the Bank of England raised the policy interest rate in December from 0.10% to 0.25%, signaling that inflation risk outweighed the disruptions risk of the Omicron variant.

Asian developed markets finished the fourth quarter of 2021 in negative territory. The uncertainty of the impact of the Omicron variant and higher commodity prices weighed down on the performance of Asian markets. Japanese equities were the worst performer on the back of a weakened yen and renewed ambiguity regarding new mobility restrictions.

In the fourth quarter of 2021, from a sector perspective within the MSCI EAFE Index, materials (+8.80%), consumer staples (+6.96%) and real estate (+6.29%) were among the best performers. Communication services (-7.68%), energy (-7.37%), and financials (+2.08%) were among the worst performers.

Describe recent portfolio activity.

During the 12-month period, as changes were made to the composition of the MSCI EAFE Index, the Fund purchased and sold securities to maintain its objective of matching the risks and return of the benchmark index.

Describe portfolio positioning at period end.

The Fund remains positioned to match the risk characteristics of the benchmark index, irrespective of the market’s future direction.

The views expressed reflect the opinions of BlackRock as of the date of this report and are subject to change based on changes in market, economic or other conditions. These views are not intended to be a forecast of future events and are no guarantee of future results.

10 2 0 2 1   BLACK ROCK   ANNUAL   REPORT   TO   SHAREHOLDERS

Fund Summary   as of December 31, 2021 (continued) iShares MSCI EAFE International Index Fund

TOTAL RETURN BASED ON A $10,000 INVESTMENT

^(a) Assuming transaction costs and other operating expenses, including administration fees, if any.

^(b) Prior to August 1, 2016, the Fund invested all of its assets in Master International Index Series, a series of Quantitative Master Series LLC. Master International Index Series invested in a statistically selected sample of equity securities included in the MSCI EAFE Index and in derivative instruments linked to the MSCI EAFE Index. On August 1, 2016, the Fund ceased to invest in the Master International Index Series as part of a “master/feeder” structure and instead began to operate as a stand-alone fund.

^(c) An equity index which captures large- and mid-cap representation across certain developed markets countries around the world, excluding the United States and Canada. The index covers approximately 85% of the free float adjusted market capitalization in each country.

Performance

	Average Annual Total Returns(a)
	1 Year						5 Years						10 Years
	Without Sales Charge			With Sales Charge			Without Sales Charge			With Sales Charge			Without Sales Charge			With Sales Charge
Institutional		11.28	%		N/A			9.70	%		N/A			7.96	%		N/A
Investor A		11.01			N/A			9.40			N/A			7.68			N/A
Investor P		11.05			5.22	%		9.42			8.25	%		7.69			7.11	%
Class K		11.33			N/A			9.74			N/A			8.00			N/A
MSCI EAFE Index		11.26			N/A			9.55			N/A			8.03			N/A

^(a) Assuming maximum sales charges, if any. Average annual total returns with and without sales charges reflect reductions for distribution and service fees. See “About Fund Performance” for a detailed description of share classes, including any related sales charges and fees, and how performance was calculated for certain share classes.

N/A — Not applicable as the share class and index do not have a sales charge.

Past performance is not an indication of future results.

Performance results may include adjustments made for financial reporting purposes in accordance with U.S. generally accepted accounting principles.

Expense Example

	Actual					Hypothetical(a)
		Beginning	Ending	Expenses			Beginning	Ending	Expenses		Annualized
		Account Value	Account Value	Paid During			Account Value	Account Value	Paid During		Expense
		(07/01/21)	(12/31/21)	the Period	(b)		(07/01/21)	(12/31/21)	the Period	(b)	Ratio
Institutional		$         1,000.00	$         1,021.60	$          0.46			$         1,000.00	$         1,024.75	$          0.46		0.09	%
Investor A		1,000.00	1,020.50	1.73			1,000.00	1,023.49	1.73		0.34
Investor P		1,000.00	1,020.60	1.73			1,000.00	1,023.49	1.73		0.34
Class K		1,000.00	1,021.50	0.20			1,000.00	1,025.00	0.20		0.04

^(a) Hypothetical 5% annual return before expenses is calculated by prorating the number of days in the most recent fiscal half year divided by 365.

^(b) For each class of the Fund, expenses are equal to the annualized expense ratio for the class, multiplied by the average account value over the period, multiplied by 184/365 (to reflect the one-half year period shown).

See “Disclosure of Expenses” for further information on how expenses were calculated.

FUND   SUMMARY 11

Fund Summary   as of December 31, 2021 (continued) iShares MSCI EAFE International Index Fund

Portfolio Information

TEN LARGEST HOLDINGS

Security	Percent of Net Assets
Nestle SA, Registered Shares		2	%
ASML Holding NV		2
Roche Holding AG		2
LVMH Moet Hennessy Louis Vuitton SE		1
Toyota Motor Corp.		1
Novartis AG, Registered Shares		1
Novo Nordisk A/S, Class B		1
AstraZeneca PLC		1
Sony Group Corp.		1
SAP SE		1

GEOGRAPHIC ALLOCATION

Country/Geographic Region	Percent of Net Assets
Japan		22	%
United Kingdom		13
France		11
Switzerland		11
Germany		9
Australia		7
Netherlands		6
Sweden		4
Denmark		3
Hong Kong		2
Spain		2
Italy		2
Finland		1
Singapore		1
Ireland		1
Belgium		1
Israel		1
Norway		1
United States		1
Other#		—	(a)
Other Assets Less Liabilities		1

^(a) Rounds to less than 1% of net assets.

^# Includes holdings within countries/geographic regions that are less than 1% of net assets. Please refer to the Schedule of Investments for such countries/geographic regions.

12 2 0 2 1   BLACK ROCK   ANNUAL   REPORT   TO   SHAREHOLDERS

Fund Summary   as of December 31, 2021 iShares Russell 2000 Small-Cap Index Fund

Investment Objective

iShares Russell 2000 Small-Cap Index Fund’s (the “Fund”) investment objective is to match the performance of the Russell 2000^® Index as closely as possible before the deduction of Fund expenses.

Portfolio Management Commentary

How did the Fund perform?

For the 12-month period ended December 31, 2021, the Fund’s Institutional Shares returned 14.73%, Investor A Shares returned 14.38%, Investor P Shares returned 14,42%, and Class K Shares returned 14.78%. The Russell 2000^® Index returned 14.82% for the same period.

Returns for the Fund’s respective share classes differ from the benchmark index based on individual share-class expenses. The Fund invests all of its assets in Master Small Cap Index Series (the “Series”), a series of Quantitative Master Series LLC.

Describe the market environment.

In the first quarter of 2021, following the strong end to 2020, favorable conditions continued with signs of a sooner-than-expected economic activity restart. Monetary conditions remained supportive, as the Fed signaled a continuing environment of low interest rates. With both the Senate and Congress passing a new $1.9 trillion stimulus package, and the United States starting to lead in the vaccine rollout, optimism continued to rise for strong economic growth in the first quarter. Despite the heightened volatility at the beginning of the quarter related to retail trading activity, the positive news about the stimulus package and the potential infrastructure bill soothed the market and supported a positive return over the first quarter.

The U.S. equity market rallied in the second quarter of 2021 as the vaccination campaign continued to accelerate, and as more signs started to emerge for a sooner-than-expected economic activity restart. The U.S. Consumer Price Index increased by more than 4% (one-year as of April 2021), which raised questions on whether this surge was sparked by temporary factors at play. However, the inflation concerns and the Fed’s cautious optimism about the recovery muted the market rally in May. In June, the U.S. equity market extended its rally, supported by the prospect of more fiscal stimulus, as President Biden reached a bipartisan $1 trillion agreement for infrastructure spending.

In the third quarter of 2021, U.S. equities continued climbing in August on the back of strong economic data and quarterly earnings reports. The positive return in markets came despite the increase in COVID-19 Delta variant cases in the United States. The Fed announcement in August was in line with expectations, as Fed Chair Jerome Powell suggested that tapering may start before year end during his Jackson Hole speech.

The positive sentiment of July and August was offset in September amid concerns regarding potential contagion from the unfolding debt crisis at Chinese property developer, Evergrande. Concerns that higher inflation and supply chain issues would last longer than expected also weighed down on the market. Lastly, the continuing disagreement in Washington D.C. regarding the debt ceiling and the infrastructure bill dampened U.S. equity performance. However, Congress passed a bill, toward the end of the third quarter, extending government funding until December 3, 2021.

Following a strong earnings season in the fourth quarter of 2021 that boosted the positive sentiment early in the quarter, the emergence of the new COVID-19 Omicron variant and the concerns about higher inflation rates weighed down on U.S. market performance in November. However, preliminary data showed that the coronavirus vaccine was effective against the Omicron variant, and the Fed shared more clarity on next year’s policy path, leading to strong positive returns to end the fourth quarter. The falling unemployment rate and the $550 billion bipartisan infrastructure bill signed by President Biden supported market performance over the fourth quarter.

The Fed’s stance on monetary policy was at the forefront of market discussions over the fourth quarter of 2021. Fed Chair Jerome Powell conceded that inflation had been far stickier than initially anticipated. These inflation pressures have been exacerbated as consumer demand continued to increase with supply chain bottlenecks and labor shortages. The Fed brought forward the dates of tapering to Spring 2022.

In the fourth quarter of 2021, from a sector perspective within the Russell 2000^® Index, utilities (+10.87%), real estate (+8.44%) and industrials (+7.71%) were among the best performers, while communication services (-9.99%), health care (-9.58%), and energy (-3.16%) were among the worst performers.

Describe recent portfolio activity.

During the 12-month period, as changes were made to the composition of the Russell 2000^® Index, the Series purchased and sold securities to maintain its objective of matching the risks and return of the benchmark index.

The Series had slightly elevated cash positions at times during the period, which had no material impact on Fund performance.

Describe portfolio positioning at period end.

The Series remains positioned to match the risk characteristics of its benchmark index, irrespective of the market’s future direction.

The views expressed reflect the opinions of BlackRock as of the date of this report and are subject to change based on changes in market, economic or other conditions. These views are not intended to be a forecast of future events and are no guarantee of future results.

FUND   SUMMARY 13

Fund Summary   as of December 31, 2021 (continued) iShares Russell 2000 Small-Cap Index Fund

TOTAL RETURN BASED ON A $10,000 INVESTMENT

^(a) Assuming transaction costs and other operating expenses, including administration fees, if any.

^(b) The Fund invests all of its assets in the Series. The Series may invest in a statistically selected sample of the stocks included in the Russell 2000^® Index and in derivative instruments linked to the Russell 2000^® Index.

^(c) An index that measures the performance of the small-cap segment of the U.S. equity universe. It is a subset of the Russell 3000^® Index representing approximately 10% of the total market capitalization of that index. It includes approximately 2,000 of the smallest securities based on a combination of their market cap and current index membership.

Performance

	Average Annual Total Returns(a)
	1 Year						5 Years						10 Years
	Without Sales Charge			With Sales Charge			Without Sales Charge			With Sales Charge			Without Sales Charge			With Sales Charge
Institutional		14.73	%		N/A			12.00	%		N/A			13.21	%		N/A
Investor A		14.38			N/A			11.72			N/A			12.94			N/A
Investor P		14.42			8.41	%		11.72			10.52	%		12.93			12.32	%
Class K		14.78			N/A			12.06			N/A			13.28			N/A
Russell 2000® Index		14.82			N/A			12.02			N/A			13.23			N/A

^(a) Assuming maximum sales charges, if any. Average annual total returns with and without sales charges reflect reductions for distribution and service fees. See “About Fund Performance” for a detailed description of share classes, including any related sales charges and fees, and how performance was calculated for certain share classes.

N/A — Not applicable as the share class and index do not have a sales charge.

Past performance is not an indication of future results.

Performance results may include adjustments made for financial reporting purposes in accordance with U.S. generally accepted accounting principles.

Expense Example

	Actual					Hypothetical(a)
		Beginning	Ending	Expenses			Beginning	Ending	Expenses		Annualized
		Account Value	Account Value	Paid During			Account Value	Account Value	Paid During		Expense
		(07/01/21)	(12/31/21)	the Period	(b)		(07/01/21)	(12/31/21)	the Period	(b)	Ratio
Institutional		$         1,000.00	$         976.90	$          0.60			$         1,000.00	$         1,024.60	$          0.61		0.12	%
Investor A		1,000.00	975.10	1.84			1,000.00	1,023.34	1.89		0.37
Investor P		1,000.00	975.30	1.84			1,000.00	1,023.34	1.89		0.37
Class K		1,000.00	977.10	0.30			1,000.00	1,024.90	0.31		0.06

^(a) Hypothetical 5% annual return before expenses is calculated by prorating the number of days in the most recent fiscal half year divided by 365.

^(b) For each class of the Fund, expenses are equal to the annualized expense ratio for the class, multiplied by the average account value over the period, multiplied by 184/365 (to reflect the one-half year period shown). Because the Fund invests all of its assets in the Master Portfolio, the expense example reflects the net expenses of both the Fund and the Master Portfolio in which it invests.

See “Disclosure of Expenses” for further information on how expenses were calculated.

14 2 0 2 1   BLACK ROCK   ANNUAL   REPORT   TO   SHAREHOLDERS

About Fund Performance

Institutional and Class K Shares are not subject to any sales charge. These shares bear no ongoing distribution or service fees and are available only to certain eligible investors.

On November 19, 2018, the iShares Municipal Bond Index Fund acquired all of the assets and assumed certain stated liabilities, of the State Farm Tax Advantaged Bond Fund (the “Predecessor Fund”), a series of State Farm Mutual Fund Trust, in a tax-free reorganization (the “Reorganization”). The Predecessor Fund is the performance and accounting survivor of the Reorganization. Accordingly, information provided herein for periods prior to the Reorganization is that of the Predecessor Fund. See Note 1 of the Notes to Financial Statements for additional information regarding the Reorganization.

Institutional and Class K Shares performance of iShares Municipal Bond Index Fund shown prior to the Institutional and Class K Shares inception date of November 19, 2018 is that of Investor A Shares, which reflect the performance of Premier Shares of the Predecessor Fund. The performance of iShares Municipal Bond Index Fund’s Institutional and Class K Shares would be substantially similar to Investor A Shares because Institutional Shares, Class K Shares and Investor A Shares invest in the same portfolio of securities and performance would only differ to the extent that Institutional Shares, Class K Shares and Investor A Shares have different expenses. The actual returns of Institutional and Class K Shares would have been higher than those of the Investor A Shares because Institutional and Class K Shares have lower expenses than the Investor A Shares.

Investor A Shares are not subject to any sales charge and bear no ongoing distribution fee. These shares are subject to an ongoing service fee of 0.25% per year. These shares are generally available through financial intermediaries. Investor A Shares performance of iShares Municipal Bond Index Fund shown prior to the Reorganization is that of the Premier Shares of the Predecessor Fund.

Investor P Shares (available in iShares MSCI EAFE International Index Fund and iShares Russell 2000 Small-Cap Index Fund) are subject to a maximum initial sales charge (front-end load) of 5.25% and a service fee of 0.25% per year (but no distribution fee). These shares are only available to investors purchasing shares through registered representatives of an insurance company’s broker-dealer that has entered into an agreement with iShares MSCI EAFE International Index Fund and iShares Russell 2000 Small-Cap Index Fund’s distributor to offer such shares. Investor P Share performance of iShares MSCI EAFE International Index Fund and iShares Russell 2000 Small-Cap Index Fund shown prior to the Investor P Shares inception date of August 6, 2018 is that of Institutional Shares (which have no distribution or service fees) and was restated to reflect Investor P Shares fees.

Investor P Shares (available in iShares Municipal Bond Index Fund) are subject to a maximum initial sales charge (front-end load) of 4.00% and a service fee of 0.25% per year (but no distribution fee). Certain redemptions of these shares may be subject to a contingent deferred sales charge (“CDSC”) where no initial sales charge was paid at the time of purchase. These shares are only available to investors purchasing shares through registered representatives of an insurance company’s broker-dealer that has entered into an agreement with the Fund’s distributor to offer such shares. Investor P Shares performance shown prior to the Reorganization is that of the Premier Shares of the Predecessor Fund.

Past performance is not an indication of future results. Financial markets have experienced extreme volatility and trading in many instruments has been disrupted. These circumstances may continue for an extended period of time and may continue to affect adversely the value and liquidity of each Fund’s investments. As a result, current performance may be lower or higher than the performance data quoted. Refer to blackrock.com to obtain performance data current to the most recent month-end. Performance results do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. Figures shown in the performance table(s) assume reinvestment of all distributions, if any, at net asset value (“NAV”) on the ex-dividend date or payable date, as applicable. Investment return and principal value of shares will fluctuate so that shares, when redeemed, may be worth more or less than their original cost. Distributions paid to each class of shares will vary because of the different levels of service, distribution and transfer agency fees applicable to each class, which are deducted from the income available to be paid to shareholders.

BlackRock Advisors, LLC (the “Manager”), each Fund’s investment adviser, has contractually and/or voluntarily agreed to waive and/or reimburse a portion of each Fund’s expenses. Without such waiver(s) and/or reimbursement(s), each Fund’s performance would have been lower. With respect to each Fund’s voluntary waiver(s), if any, the Manager is under no obligation to waive and/or reimburse or to continue waiving and/or reimbursing its fees and such voluntary waiver(s) may be reduced or discontinued at any time. With respect to each Fund’s contractual waiver(s), if any, the Manager is under no obligation to continue waiving and/or reimbursing its fees after the applicable termination date of such agreement. See the Notes to Financial Statements for additional information on waivers and/or reimbursements.

The standardized 30-day yield includes the effects of any waivers and/or reimbursements. The unsubsidized 30-day yield excludes the effects of any waivers and/or reimbursements.

ABOUT  FUND  PERFORMANCE 15

Disclosure of Expenses

Shareholders of each Fund may incur the following charges: (a) transactional expenses, such as sales charges; and (b) operating expenses, including investment advisory fees, service and distribution fees, including 12b-1 fees, acquired fund fees and expenses, and other fund expenses. The expense examples shown (which are based on a hypothetical investment of $1,000 invested at the beginning of the period (or from the commencement of operations if less than 6 months) and held through the end of the period) are intended to assist shareholders both in calculating expenses based on an investment in each Fund and in comparing these expenses with similar costs of investing in other mutual funds.

The expense examples provide information about actual account values and actual expenses. Annualized expense ratios reflect contractual and voluntary fee waivers, if any. In order to estimate the expenses a shareholder paid during the period covered by this report, shareholders can divide their account value by $1,000 and then multiply the result by the number corresponding to their Fund and share class under the heading entitled “Expenses Paid During the Period.”

The expense examples also provide information about hypothetical account values and hypothetical expenses based on a Fund’s actual expense ratio and an assumed rate of return of 5% per year before expenses. In order to assist shareholders in comparing the ongoing expenses of investing in these Funds and other funds, compare the 5% hypothetical examples with the 5% hypothetical examples that appear in shareholder reports of other funds.

The expenses shown in the expense examples are intended to highlight shareholders’ ongoing costs only and do not reflect transactional expenses, such as sales charges, if any. Therefore, the hypothetical examples are useful in comparing ongoing expenses only and will not help shareholders determine the relative total expenses of owning different funds. If these transactional expenses were included, shareholder expenses would have been higher.

Derivative Financial Instruments

The Funds may invest in various derivative financial instruments. These instruments are used to obtain exposure to a security, commodity, index, market, and/or other assets without owning or taking physical custody of securities, commodities and/or other referenced assets or to manage market, equity, credit, interest rate, foreign currency exchange rate, commodity and/or other risks. Derivative financial instruments may give rise to a form of economic leverage and involve risks, including the imperfect correlation between the value of a derivative financial instrument and the underlying asset, possible default of the counterparty to the transaction or illiquidity of the instrument. The Funds’ successful use of a derivative financial instrument depends on the investment adviser’s ability to predict pertinent market movements accurately, which cannot be assured. The use of these instruments may result in losses greater than if they had not been used, may limit the amount of appreciation a Fund can realize on an investment and/or may result in lower distributions paid to shareholders. The Funds’ investments in these instruments, if any, are discussed in detail in the Notes to Financial Statements.

16 2 0 2 1   BLACK ROCK   ANNUAL   REPORT   TO   SHAREHOLDERS

Schedule of Investments December 31, 2021 iShares Municipal Bond Index Fund (Percentages shown are based on Net Assets)

Security	Par (000)		Value
Municipal Bonds
Alabama — 0.5%
State — 0.2%
Alabama Public School and College Authority, Refunding RB, Series A, 4.00%, 11/01/38	$	395	$	476,015
Transportation — 0.3%
Alabama Federal Aid Highway Finance Authority, Refunding RB, Series B, 5.00%, 09/01/24(a)		900		1,010,363
Total Municipal Bonds in Alabama				1,486,378
Arizona — 1.7%
County/City/Special District/School District — 0.2%
City of Phoenix, Refunding GO, 5.00%, 07/01/24		650		723,944
Health — 0.3%
Arizona Health Facilities Authority, Refunding RB, Series A, 4.00%, 01/01/23(b)		1,000		1,000,000
Transportation — 0.3%
Arizona Department of Transportation State Highway Fund Revenue, Refunding RB, Sub-Series A, 5.00%, 07/01/22(b)		1,000		1,023,654
Utilities — 0.9%
Salt River Project Agricultural Improvement & Power District, Refunding RB, Series A, 5.00%, 01/01/34		2,480		2,975,039
Total Municipal Bonds in Arizona				5,722,637
California — 21.0%
County/City/Special District/School District — 4.4%
Coast Community College District, Refunding GO, Series A, 4.00%, 08/01/23(b)		1,000		1,059,347
Contra Costa Community College District, GO, Series A, 4.00%, 08/01/39		1,000		1,083,398
El Camino Community College District Foundation, GO, CAB, Series C, 0.00%, 08/01/38(c)		680		472,787
Fremont Union High School District, Refunding GO, Series A, 5.00%, 08/01/44		1,350		1,643,627
Los Angeles Community College District, Refunding GO, Series A, 5.00%, 08/01/24(b)		1,000		1,118,720
Los Angeles County Facilities Inc., RB, Series A, 4.00%, 12/01/48		1,000		1,159,709
Los Angeles Unified School District, GO, Series B-1, 5.00%, 07/01/33		1,500		1,850,002
Sacramento City Financing Authority, Refunding RB, Series E, (AMBAC), 5.25%, 12/01/30		250		322,127
San Diego Community College District, Refunding GO, 4.00%, 08/01/26(b)		500		578,563
San Diego Unified School District, GO
Series I, 5.00%, 07/01/41		1,000		1,214,390
Series I, 5.00%, 07/01/47		2,075		2,503,820
Series L, 4.00%, 07/01/49		1,000		1,176,095
San Marcos Unified School District, GO, CAB, Series B, 0.00%, 08/01/51(c)		350		168,378
				14,350,963
Education — 2.3%
California Educational Facilities Authority, RB, Series U-6, 5.00%, 05/01/45		1,260		1,957,899
California State University, Refunding RB Series A, 4.00%, 11/01/35		500		564,380

Security	Par (000)		Value
Education (continued)
California State University, Refunding RB (continued)
Series A, 4.00%, 11/01/38	$	500	$	562,680
Series A, 5.00%, 11/01/43		540		625,750
Series A, 5.00%, 11/01/48		1,030		1,275,615
University of California, Refunding RB
Series AR, 5.00%, 05/15/41		605		712,986
Series AY, 5.00%, 05/15/32		500		610,211
Series AY, 5.00%, 05/15/36		1,000		1,216,313
				7,525,834
Health — 1.1%
California Health Facilities Financing Authority Refunding RB, 5.00%, 08/15/51		1,000		1,284,424
California Health Facilities Financing Authority, RB, Series A, 5.00%, 11/15/48		1,950		2,377,871
				3,662,295
State — 5.8%
California State Public Works Board, RB, Series A, 5.00%, 03/01/38		1,000		1,050,563
California State Public Works Board, Refunding RB
Series B, 5.00%, 10/01/26		250		300,588
Series C, 4.00%, 11/01/32		500		574,416
Series C, 5.00%, 11/01/34		685		818,475
State of California, GO, 5.00%, 03/01/45		1,000		1,123,816
State of California, Refunding GO
5.00%, 10/01/24		475		534,826
5.00%, 10/01/25		1,000		1,166,631
5.00%, 08/01/26		540		626,800
5.00%, 08/01/27		1,000		1,198,265
5.00%, 08/01/31		1,000		1,188,301
5.00%, 09/01/31		565		673,314
5.00%, 12/01/31		2,000		2,171,749
4.00%, 09/01/32		250		286,496
4.00%, 09/01/33		1,000		1,144,834
5.00%, 08/01/35		1,000		1,221,756
4.00%, 09/01/35		1,000		1,143,023
5.00%, 09/01/35		1,000		1,189,181
5.00%, 02/01/38		1,000		1,048,495
5.00%, 12/01/43		500		542,737
5.00%, 08/01/46		1,000		1,177,453
				19,181,719
Tobacco — 0.9%
Golden State Tobacco Securitization Corp., Refunding RB, Series A, (SAP), 5.00%, 06/01/25(b)		2,400		2,773,924
Transportation — 2.9%
Bay Area Toll Authority, RB, Series F-1, 4.00%, 04/01/56		1,000		1,145,682
Bay Area Toll Authority, Refunding RB, 4.00%, 04/01/38		500		577,548
City of Long Beach California Harbor Revenue, Refunding ARB, Series C, 5.00%, 05/15/47		500		600,019
City of Los Angeles Department of Airports, ARB, Sub- Series B, 5.00%, 05/15/42		1,500		1,817,035
City of Los Angeles Department of Airports, Refunding RB, Series B, 5.00%, 05/15/35		400		406,937
Foothill-Eastern Transportation Corridor Agency, Refunding RB, CAB(c)
Series A, (AGM), 0.00%, 01/15/36		500		370,605
Series A, (AGM), 0.00%, 01/15/37		1,000		720,232

FUND  SCHEDULES   OF  INVESTMENTS 17

Schedule of Investments   (continued) December 31, 2021 iShares Municipal Bond Index Fund (Percentages shown are based on Net Assets)

Security	Par (000)		Value
Transportation (continued)
Riverside County Transportation Commission Refunding RB, 4.00%, 06/01/37	$	1,154	$	1,387,701
San Francisco City & County Airport Comm-San Francisco International Airport, Refunding ARB
Series E, 5.00%, 05/01/48		1,190		1,459,510
Series A, AMT, 4.00%, 05/01/49		1,000		1,135,947
				9,621,216
Utilities — 3.6%
City of San Francisco California Public Utilities Commission Water Revenue, Refunding RB, 5.00%, 11/01/35		1,305		1,560,650
East Bay Municipal Utility District Water System Revenue, Refunding RB, Series B, 5.00%, 06/01/33		1,435		1,758,518
Los Angeles Department of Water & Power Power System Revenue, RB, Series D, 5.00%, 07/01/44		1,500		1,658,392
Los Angeles Department of Water & Power Power System Revenue, Refunding RB
Series A, 5.00%, 07/01/30		1,500		1,697,841
Series A, 5.00%, 07/01/37		1,000		1,229,098
Sacramento Municipal Utility District, RB, Series A, 5.00%, 08/15/41		575		615,106
San Diego Public Facilities Financing Authority, Refunding RB, Series A, Subordinate, 5.00%, 08/01/43		500		619,312
San Francisco City & County Public Utilities Commission Wastewater Revenue, Refunding RB, Series B, 4.00%, 10/01/42		1,500		1,539,955
State of California Department of Water Resources, Refunding RB, Series AW, 5.00%, 12/01/26(b)		1,000		1,214,843
				11,893,715
Total Municipal Bonds in California				69,009,666
Colorado — 1.9%
County/City/Special District/School District — 0.5%
City & County of Denver Colorado, Refunding RB, Series A, 4.00%, 08/01/46		1,500		1,656,099
Health — 0.3%
Colorado Health Facilities Authority, Refunding RB, Series A, 5.00%, 08/01/44		1,000		1,227,991
State — 0.2%
State of Colorado, COP, Series N, 4.00%, 03/15/43		500		572,015
Transportation — 0.5%
City & County of Denver Colorado Airport System Revenue, Refunding ARB, Series A, AMT, 5.00%, 12/01/35		1,000		1,230,694
E-470 Public Highway Authority, Refunding RB, Series A, 5.00%, 09/01/40		400		444,469
				1,675,163
Utilities — 0.4%
Board of Water Commissioners City & County of Denver, RB, Series A, 4.00%, 12/15/26		1,230		1,233,434
Total Municipal Bonds in Colorado				6,364,702
Connecticut — 2.2%
Health — 0.4%
Connecticut State Health & Educational Facilities Authority, Refunding RB, 5.00%, 12/01/45		1,000		1,171,051

Security	Par (000)		Value
State — 1.8%
State of Connecticut Special Tax Revenue, RB
Series A, 5.00%, 09/01/24	$	400	$	447,917
Series A, 5.00%, 10/01/29		725		782,509
Series A, 4.00%, 05/01/36		1,000		1,199,640
Series A, 4.00%, 09/01/36		430		484,470
State of Connecticut, GO
Series A, 5.00%, 10/15/23		850		920,433
Series A, 5.00%, 10/15/27		400		432,178
Series B, 5.00%, 06/15/28		400		459,928
Series B, 4.00%, 06/15/33		850		939,553
State of Connecticut, Refunding GO, Series B, 5.00%, 05/15/25		250		287,399
				5,954,027
Total Municipal Bonds in Connecticut				7,125,078
District of Columbia — 2.5%
State — 0.5%
District of Columbia, GO
Series D, 5.00%, 06/01/26		500		596,732
Series D, 4.00%, 06/01/34		1,000		1,159,649
				1,756,381
Transportation — 1.1%
Metropolitan Washington Airports Authority Aviation Revenue, Refunding RB, Series A, AMT, 4.00%, 10/01/51		1,500		1,754,253
Washington Metropolitan Area Transit Authority, RB, Series A, 4.00%, 07/15/45		1,500		1,773,838
				3,528,091
Utilities — 0.9%
District of Columbia Water & Sewer Authority, Refunding RB
Sub-Series A, 5.00%, 10/01/45		1,510		1,743,355
Series C, Sub-Lien, 5.00%, 10/01/44		1,000		1,111,704
				2,855,059
Total Municipal Bonds in District of Columbia				8,139,531
Florida — 2.7%
County/City/Special District/School District — 0.7%
County of Miami-Dade Florida Transit System, RB, Series A, 4.00%, 07/01/50		1,500		1,743,718
School Board of Miami-Dade County, Refunding COP, Series D, 5.00%, 02/01/27		500		585,233
				2,328,951
State — 0.3%
State of Florida, Refunding GO, Series A, 5.00%, 07/01/25		1,000		1,157,363
Transportation — 1.7%
Central Florida Expressway Authority, Refunding RB, Series B, Senior Lien, 5.00%, 07/01/33		1,000		1,179,564
County of Broward Florida Airport System Revenue, Refunding ARB, Series Q-1, 5.00%, 10/01/22(b)		1,000		1,036,039
Greater Orlando Aviation Authority, ARB, Series A, AMT, 5.00%, 10/01/54		850		1,035,460

18 2 0 2 1   BLACK ROCK   ANNUAL   REPORT   TO   SHAREHOLDERS

Schedule of Investments   (continued) December 31, 2021 iShares Municipal Bond Index Fund (Percentages shown are based on Net Assets)

Security	Par (000)		Value
Transportation (continued)
Miami-Dade County Expressway Authority, Refunding RB, Series B, 5.00%, 07/01/25	$	1,000	$	1,111,119
State of Florida Department of Transportation Turnpike System Revenue, RB, Series A, 4.00%, 07/01/48		1,000		1,147,899
				5,510,081
Total Municipal Bonds in Florida				8,996,395
Georgia — 2.0%
County/City/Special District/School District — 0.5%
Gwinnett County School District, GO, 5.00%, 02/01/40		400		502,901
Metropolitan Atlanta Rapid Transit Authority, Refunding RB, Series B, 5.00%, 07/01/35		1,000		1,185,998
				1,688,899
State — 0.9%
State of Georgia, GO, Series A, 5.00%, 02/01/29		650		765,340
State of Georgia, Refunding GO, Series C, 5.00%, 07/01/28		1,710		2,105,850
				2,871,190
Transportation — 0.4%
City of Atlanta Georgia Department of Aviation, Refunding RB, Series A, 5.00%, 07/01/29		1,000		1,286,939
Utilities — 0.2%
City of Atlanta Georgia Water & Wastewater Revenue, Refunding RB, 5.00%, 05/01/25(b)		500		575,270
Total Municipal Bonds in Georgia				6,422,298
Hawaii — 0.2%
State — 0.2%
State of Hawaii, Refunding GO, Series A, 5.00%, 11/01/22(b)		500		519,905
Illinois — 3.9%
Health — 0.4%
Illinois Finance Authority, Refunding RB, 5.00%, 12/01/40		1,000		1,172,225
State — 2.1%
Metropolitan Pier & Exposition Authority, RB, (AGM), 0.00%, 06/15/46(c)		1,105		587,771
State of Illinois, GO
5.00%, 05/01/39		1,500		1,638,257
Series C, 5.00%, 11/01/29		1,000		1,201,304
Series D, 5.00%, 11/01/24		1,000		1,120,962
Series D, 5.00%, 11/01/26		500		593,305
State of Illinois, Refunding GO
5.00%, 02/01/22		500		501,802
Series A, 5.00%, 10/01/25		500		576,586
Series A, 5.00%, 10/01/28		500		615,790
				6,835,777
Transportation — 1.4%
Chicago O’Hare International Airport, ARB, Series E, Senior Lien, 5.00%, 01/01/24		410		447,340
Chicago O’Hare International Airport, Refunding ARB
Series B, Senior Lien, 4.00%, 01/01/44		1,000		1,145,308
Series B, Senior Lien, 5.00%, 01/01/48		1,000		1,216,465

Security	Par (000)		Value
Transportation (continued)
Chicago Transit Authority Capital Grant Receipts Revenue Refunding RB, 5.00%, 06/01/28	$	190	$	236,290
Illinois State Toll Highway Authority, RB, Series B, 5.00%, 01/01/41		1,000		1,169,463
Illinois State Toll Highway Authority, Refunding RB
Series A, 5.00%, 01/01/25		100		113,285
Series A, 5.00%, 01/01/30		250		315,662
				4,643,813
Total Municipal Bonds in Illinois				12,651,815
Indiana — 0.0%
State — 0.0%
Indiana Finance Authority, Refunding RB, Series C, 5.00%, 12/01/24		100		113,406
Kansas — 0.7%
County/City/Special District/School District — 0.1%
University of Kansas Hospital Authority Refunding RB, 5.00%, 03/01/27(b)		155		187,942
Health — 0.1%
University of Kansas Hospital Authority Refunding RB, 5.00%, 03/01/47		425		504,665
Transportation — 0.5%
State of Kansas Department of Transportation, RB 5.00%, 09/01/27		1,000		1,160,073
5.00%, 09/01/34		500		578,098
				1,738,171
Total Municipal Bonds in Kansas				2,430,778
Louisiana(b) — 0.5%
County/City/Special District/School District — 0.3%
State of Louisiana Gasoline & Fuels Tax Revenue, Refunding RB, Series C-1, 2nd Lien, 5.00%, 05/01/23		925		983,434
State — 0.2%
State of Louisiana, Refunding GO, Series C, 5.00%, 07/15/22		500		512,870
Total Municipal Bonds in Louisiana				1,496,304
Maryland — 1.0%
State — 0.7%
State of Maryland, GO
Series A, 5.00%, 03/15/28		450		564,780
Series A, 5.00%, 03/15/31		400		486,518
State of Maryland, Refunding GO, Series B, 5.00%, 08/01/25		1,000		1,161,515
				2,212,813
Transportation — 0.3%
State of Maryland Department of Transportation, ARB 4.00%, 12/15/28		405		433,718
4.00%, 11/01/29		695		762,734
				1,196,452
Total Municipal Bonds in Maryland				3,409,265

FUND  SCHEDULES   OF  INVESTMENTS 19

Schedule of Investments   (continued) December 31, 2021 iShares Municipal Bond Index Fund (Percentages shown are based on Net Assets)

Security	Par (000)		Value
Massachusetts — 3.3%
Education — 0.7%
Massachusetts Development Finance Agency, RB, Series P, 5.00%, 07/01/50	$	500	$	804,235
Massachusetts Development Finance Agency, Refunding RB, Series A, 4.00%, 07/15/36		1,000		1,142,300
University of Massachusetts Building Authority, Refunding RB, Series 1, 5.00%, 11/01/24(b)		400		452,145
				2,398,680
Health — 0.4%
Massachusetts Development Finance Agency, Refunding RB, 5.00%, 07/01/34		1,000		1,228,428
State — 2.2%
Commonwealth of Massachusetts, GO
Series A, 5.00%, 03/01/26		725		857,641
Series A, 5.00%, 01/01/48		1,000		1,221,462
Series C, 5.00%, 05/01/29		1,000		1,062,067
Series E, 4.00%, 04/01/46		530		583,463
Series F, 5.00%, 11/01/37		500		616,862
Series F, 5.00%, 11/01/42		1,000		1,231,581
Series G, 4.00%, 09/01/32		1,325		1,517,774
				7,090,850
Total Municipal Bonds in Massachusetts				10,717,958
Michigan — 1.0%
Education — 0.2%
University of Michigan, Refunding RB, 5.00%, 04/01/46		585		684,887
Health — 0.4%
Michigan Finance Authority, Refunding RB, Series A, 5.00%, 12/01/41		1,000		1,260,369
State — 0.4%
State of Michigan Trunk Line Revenue, RB, Series B, 5.00%, 11/15/45		1,000		1,288,253
Total Municipal Bonds in Michigan				3,233,509
Missouri — 0.9%
Transportation — 0.5%
Missouri Highway & Transportation Commission, Refunding RB, Series A, 1st Lien, 5.00%, 05/01/24		1,500		1,662,754
Utilities — 0.4%
Metropolitan St. Louis Sewer District, Refunding RB
Series B, 5.00%, 05/01/25(b)		330		378,497
Series B, 5.00%, 05/01/45		705		797,913
				1,176,410
Total Municipal Bonds in Missouri				2,839,164
New Jersey — 5.3%
Health — 0.3%
New Jersey Health Care Facilities Financing Authority RB, 4.00%, 07/01/51		1,000		1,181,645
State — 2.2%
New Jersey Economic Development Authority, RB, Series EEE, 5.00%, 06/15/48		1,000		1,201,035
New Jersey Economic Development Authority, Refunding RB
Series NN, 5.00%, 03/01/22		500		503,750
Series NN, 5.00%, 03/01/25		500		526,089
Series NN, 5.00%, 03/01/30		1,000		1,051,445

Security	Par (000)		Value
State (continued)
New Jersey Transportation Trust Fund Authority, RB, Series S, 5.00%, 06/15/46	$	500	$	601,430
New Jersey Transportation Trust Fund Authority, RB, CAB, Series A, 0.00%, 12/15/38(c)		530		353,220
New Jersey Transportation Trust Fund Authority, Refunding RB, Series A, 5.00%, 12/15/36		1,000		1,223,859
State of New Jersey, GO, Series A, 4.00%, 06/01/31		1,500		1,845,943
				7,306,771
Transportation — 2.8%
New Jersey Transportation Trust Fund Authority, RB
Series A, 0.00%, 12/15/25(c)		100		95,570
Series AA, 5.00%, 06/15/25		150		165,971
Series AA, 4.75%, 06/15/38		280		311,726
New Jersey Transportation Trust Fund Authority, RB, CAB(c)
Series A, 0.00%, 12/15/32		250		200,219
Series A, 0.00%, 12/15/35		3,075		2,258,241
New Jersey Transportation Trust Fund Authority, Refunding RB
Series A, 4.00%, 12/15/31		1,000		1,172,267
Series D, 5.00%, 12/15/24		250		282,008
New Jersey Turnpike Authority, RB, Series A, 5.00%, 01/01/34		1,000		1,106,644
New Jersey Turnpike Authority, Refunding RB
Series B, 5.00%, 01/01/23(b)		840		880,084
Series E, 5.00%, 01/01/29		1,000		1,238,795
Series E, 5.00%, 01/01/32		1,100		1,355,769
				9,067,294
Total Municipal Bonds in New Jersey				17,555,710
New York — 24.6%
County/City/Special District/School District — 7.0%
City of New York, GO
Series B-1, 5.00%, 12/01/41		1,390		1,655,902
Series D, 5.00%, 12/01/35		500		628,424
Series D, 4.00%, 12/01/41		1,000		1,163,004
Series F-1, 5.00%, 04/01/34		1,115		1,378,983
Series F-1, 5.00%, 03/01/43		1,000		1,283,354
Series F-1, 5.00%, 03/01/50		1,000		1,272,199
City of New York, Refunding GO
Series I, 5.00%, 08/01/22(b)		835		858,460
Series I, 5.00%, 08/01/26		165		169,529
Hudson Yards Infrastructure Corp., Refunding RB, Series A, 5.00%, 02/15/42		910		1,075,439
Nassau County Interim Finance Authority, Refunding RB, Series A, 4.00%, 11/15/34		310		384,602
New York City Industrial Development Agency, Refunding RB, (AGM), 4.00%, 03/01/45		300		346,635
New York City Transitional Finance Authority Future Tax Secured Revenue RB, 3.00%, 08/01/41		1,500		1,617,000
New York City Transitional Finance Authority Future Tax Secured Revenue, RB
5.00%, 05/01/37		1,000		1,174,802
Series A-1, 5.00%, 08/01/36		500		623,863
Series A-1, 5.00%, 08/01/42		1,000		1,237,485
Series B-1, 5.00%, 08/01/40		1,500		1,770,600
Series C-2, 5.00%, 05/01/36		1,000		1,238,619
Sub-Series I, 5.00%, 05/01/42		1,620		1,714,975

20 2 0 2 1   BLACK ROCK   ANNUAL   REPORT   TO   SHAREHOLDERS

Schedule of Investments   (continued) December 31, 2021 iShares Municipal Bond Index Fund (Percentages shown are based on Net Assets)

Security	Par (000)		Value
County/City/Special District/School District (continued)
New York State Thruway Authority RB, 4.00%, 03/15/56	$	1,000	$	1,166,366
New York State Urban Development Corp. RB, 4.00%, 03/15/36		2,000		2,379,887
				23,140,128
Education — 0.7%
New York State Dormitory Authority, RB, 5.00%, 10/01/45		1,500		2,323,754
Health — 0.4%
New York State Dormitory Authority, Refunding RB, 1st Series, 5.00%, 07/01/42		1,000		1,208,530
State — 6.4%
New York City Transitional Finance Authority Building Aid Revenue, RB, Series S-1, Subordinate, (SAW), 5.00%, 07/15/31		1,000		1,135,397
New York City Transitional Finance Authority Building Aid Revenue, Refunding RB
Series S-1, (SAW), 5.00%, 07/15/35		2,000		2,434,712
Series -2A, Subordinate, (SAW), 4.00%, 07/15/36		1,455		1,708,574
New York State Dormitory Authority, RB
Series A, 5.00%, 03/15/35		740		912,256
Series A, 5.00%, 02/15/39		1,000		1,182,173
Series A, 5.00%, 03/15/45		1,000		1,222,091
Series B, 5.00%, 03/15/42		2,000		2,018,679
New York State Dormitory Authority, Refunding RB
Series A, 5.00%, 03/15/24(a)		600		661,593
Series A, 5.00%, 03/15/28		250		312,978
Series A, 4.00%, 03/15/43		500		579,600
Series A, 3.00%, 03/15/49		1,500		1,585,277
Series D, 4.00%, 02/15/47		1,000		1,160,267
Series E, 5.00%, 03/15/27		500		611,045
Series E, 5.00%, 09/15/28(b)		5		6,321
Series E, 5.00%, 03/15/29		995		1,262,479
New York State Urban Development Corp., Refunding RB
Series A, 5.00%, 03/15/24		1,000		1,101,957
Series A, 5.00%, 03/15/27		600		732,566
Series A, 5.00%, 03/15/39		1,000		1,269,751
Sales Tax Asset Receivable Corp., Refunding RB, Series A, 5.00%, 10/15/24(b)		1,000		1,128,322
				21,026,038
Transportation — 5.0%
Metropolitan Transportation Authority, Refunding RB
Series B, 5.00%, 11/15/37		1,075		1,248,569
Series B-1, 5.00%, 11/15/47		1,000		1,205,644
Series D, 5.00%, 11/15/25		1,235		1,282,522
Series D-1, 5.00%, 11/15/34(d)		1,000		1,120,962
Series E-1, 5.00%, 11/15/42		1,260		1,305,686
Sub-Series C-1, 5.00%, 11/15/34		1,000		1,201,378
New York State Thruway Authority, Refunding RB, Series B, Subordinate, 4.00%, 01/01/50		1,000		1,148,034
Port Authority of New York & New Jersey, Refunding ARB 179th Series, 5.00%, 12/01/32		1,000		1,086,876
194th Series, 5.00%, 10/15/34		1,395		1,614,242
194th Series, 5.00%, 10/15/41		835		960,833
Triborough Bridge & Tunnel Authority, RB, Series A, 4.00%, 11/15/42		1,000		1,026,680
Triborough Bridge & Tunnel Authority, Refunding RB Series A, 5.00%, 11/15/31		1,000		1,179,902

Security	Par (000)		Value
Transportation (continued)
Triborough Bridge & Tunnel Authority, Refunding RB (continued)
Series A, 5.00%, 11/15/40	$	600	$	682,206
Series B, 5.00%, 11/15/38		1,000		1,212,220
				16,275,754
Utilities — 5.1%
Long Island Power Authority, Refunding RB, Series B, 5.00%, 09/01/41		1,500		1,764,234
New York City Water & Sewer System, RB
Series CC-1, 5.00%, 06/15/48		1,000		1,202,415
Series DD-1, 4.00%, 06/15/49		1,000		1,148,733
Series DD-2, 5.00%, 06/15/24		500		522,808
New York City Water & Sewer System, Refunding RB
Series DD, 5.00%, 06/15/35		2,500		2,769,858
Series DD, 5.00%, 06/15/39		420		464,468
Series EE, 5.00%, 06/15/36		1,000		1,163,663
New York Power Authority, Refunding RB, Series A, 4.00%, 11/15/50		1,000		1,173,706
New York State Dormitory Authority RB, 5.00%, 10/01/48		1,000		1,582,005
New York State Environmental Facilities Corp., Refunding RB, Series A, Subordinate, 4.00%, 06/15/46		1,475		1,640,710
Utility Debt Securitization Authority, Refunding RB
Series TE, Restructured, 5.00%, 12/15/34		1,000		1,087,518
Series TE, Restructured, 5.00%, 12/15/41		2,000		2,167,697
				16,687,815
Total Municipal Bonds in New York.				80,662,019
North Carolina(c) — 0.3%
Transportation — 0.3%
North Carolina Turnpike Authority, RB, CAB 0.00%, 01/01/49		1,000		446,157
Series B, (AGC), 0.00%, 01/01/34		500		394,250
Total Municipal Bonds in North Carolina				840,407
Ohio — 1.0%
State — 0.2%
State of Ohio, Refunding GO, Series B, 5.00%, 09/15/25		510		593,869
Transportation — 0.4%
Ohio Turnpike & Infrastructure Commission, RB, Series A, 5.00%, 02/15/46		1,000		1,290,304
Utilities — 0.4%
American Municipal Power, Inc., Refunding RB, 5.00%, 02/15/33		1,000		1,278,496
Total Municipal Bonds in Ohio				3,162,669
Pennsylvania — 3.2%
Health — 0.8%
Geisinger Authority, Refunding RB, 5.00%, 04/01/50		1,000		1,244,279
Pennsylvania Higher Educational Facilities Authority, RB, 5.00%, 08/15/49		1,000		1,245,590
				2,489,869
State — 1.3%
Commonwealth of Pennsylvania, GO 1st Series, 5.00%, 03/15/29		1,000		1,138,402
2nd Series, 5.00%, 10/15/26		685		741,120

FUND  SCHEDULES   OF  INVESTMENTS 21

Schedule of Investments   (continued) December 31, 2021 iShares Municipal Bond Index Fund (Percentages shown are based on Net Assets)

Security	Par (000)		Value
State (continued)
Commonwealth of Pennsylvania, Refunding GO, 1st Series, 5.00%, 01/01/28	$	1,105	$	1,333,759
Pennsylvania Economic Development Financing Authority, RB, AMT, 5.00%, 12/31/38		1,000		1,169,457
				4,382,738
Transportation — 1.1%
Delaware River Port Authority, ARB, Series A, 5.00%, 01/01/39		125		155,297
Delaware River Port Authority, Refunding RB, Series B, 5.00%, 01/01/26		250		293,151
Pennsylvania Turnpike Commission, RB
Series A-1, 5.00%, 12/01/47		1,000		1,214,045
Series C, 5.00%, 12/01/23(b)		760		828,008
Series C, 5.00%, 12/01/43		240		259,848
Series A, Subordinate, 4.00%, 12/01/46		425		492,576
Series A, Subordinate, 4.00%, 12/01/50		480		555,535
				3,798,460
Total Municipal Bonds in Pennsylvania				10,671,067
South Carolina — 0.4%
Utilities — 0.4%
South Carolina Public Service Authority Refunding RB, 5.00%, 12/01/51		305		390,037
South Carolina Public Service Authority, Refunding RB, Series A, 4.00%, 12/01/40		750		887,487
Total Municipal Bonds in South Carolina				1,277,524
Tennessee — 2.1%
County/City/Special District/School District — 0.3%
Metropolitan Government of Nashville & Davidson County Tennessee, Refunding GO, 4.00%, 07/01/30		765		892,946
State — 1.5%
State of Tennessee, Refunding GO, Series A, 4.00%, 08/01/22(b)		5,000		5,110,571
Transportation — 0.3%
Metropolitan Nashville Airport Authority, ARB, Series A, 5.00%, 07/01/45		900		1,027,146
Total Municipal Bonds in Tennessee				7,030,663
Texas — 9.2%
County/City/Special District/School District — 0.9%
Carrollton-Farmers Branch Independent School District, Refunding GO(b)
Series 2018, (PSF), 4.00%, 02/15/22		310		311,332
Series A, (PSF), 4.00%, 02/15/23		445		463,337
Cypress-Fairbanks Independent School District, Refunding GO, Series C, (PSF), 5.00%, 02/15/44		500		546,752
Dallas Area Rapid Transit, Refunding RB, Series A, 5.00%, 12/01/23		800		871,267
Lewisville Independent School District, Refunding GO, Series B, 5.00%, 08/15/28		570		658,956
				2,851,644
Education — 0.1%
Board of Regents of the University of Texas System, RB, Series E, 5.00%, 08/15/27		400		494,609

Security	Par (000)		Value
Health — 0.4%
Tarrant County Cultural Education Facilities Finance Corp., Refunding RB, Series A, 5.00%, 11/15/45	$	1,000	$	1,169,116
State — 0.7%
State of Texas, Refunding GO 5.00%, 04/01/24(b)		1,000		1,103,132
Series A, 5.00%, 10/01/36		1,000		1,154,940
				2,258,072
Transportation — 4.6%
Central Texas Regional Mobility Authority, RB
Series C, 5.00%, 01/01/27		1,000		1,161,003
Series A, Senior Lien, 5.00%, 07/01/25(b)		1,000		1,154,349
Central Texas Regional Mobility Authority, Refunding RB, Series A, Senior Lien, 5.00%, 01/01/23(b)		1,000		1,046,899
Central Texas Turnpike System, RB, Series C, 5.00%, 08/15/37		1,000		1,115,450
Central Texas Turnpike System, RB, CAB, Series A, (AMBAC), 0.00%, 08/15/30(c)		270		236,720
Dallas Fort Worth International Airport, Refunding RB, Series A, 4.00%, 11/01/34		1,250		1,512,534
Grand Parkway Transportation Corp., RB 5.00%, 02/01/23		570		597,959
Series A, 5.00%, 10/01/35		695		864,590
Grand Parkway Transportation Corp., Refunding RB, 4.00%, 10/01/49		500		579,511
Harris County Toll Road Authority, Refunding RB, Series A, Senior Lien, 5.00%, 08/15/31		1,000		1,238,198
North Texas Tollway Authority, Refunding RB
Series A, 5.00%, 01/01/38		1,000		1,225,618
Series A, 5.00%, 01/01/43		1,815		2,218,115
Series B, 5.00%, 01/01/34		1,000		1,126,482
State of Texas, Refunding GO, Series A, 5.00%, 10/01/24(b)		1,000		1,124,779
				15,202,207
Utilities — 2.5%
City of Austin Texas Electric Utility Revenue, Refunding RB, Series A, 5.00%, 11/15/45		1,000		1,140,500
City of Austin Texas Water & Wastewater System Revenue, Refunding RB, 5.00%, 11/15/42		2,000		2,077,797
City of Garland Texas Electric Utility System Revenue, Refunding RB, 4.00%, 03/01/49		1,000		1,143,829
City of San Antonio Texas Electric & Gas Systems Revenue, Refunding RB, Series A, 5.00%, 02/01/26		500		587,656
Lower Colorado River Authority, Refunding RB, Series A, 5.00%, 05/15/36		750		762,990
Texas Water Development Board, RB
Series A, 4.00%, 10/15/37		1,180		1,381,207
Series B, 5.00%, 04/15/49		1,000		1,241,170
				8,335,149
Total Municipal Bonds in Texas				30,310,797
Utah — 0.2%
State — 0.2%
State of Utah, GO, 5.00%, 07/01/25		450		521,323

22 2 0 2 1   BLACK ROCK   ANNUAL   REPORT   TO   SHAREHOLDERS

Schedule of Investments   (continued) December 31, 2021 iShares Municipal Bond Index Fund (Percentages shown are based on Net Assets)

Security	Par (000)		Value
Virginia — 1.9%
County/City/Special District/School District — 0.7%
City of Alexandria Virginia, GO, Series A, (SAW), 3.00%, 07/15/46	$	1,000	$	1,109,626
County of Fairfax Virginia, Refunding GO, Series A, (SAW), 4.00%, 10/01/27		1,000		1,142,054
				2,251,680
State — 0.4%
Virginia College Building Authority, Refunding RB, Series E, 5.00%, 02/01/30		1,000		1,238,222
Transportation — 0.6%
Virginia Commonwealth Transportation Board, Refunding RB
5.00%, 09/15/23		500		540,032
5.00%, 03/15/27		285		346,744
Series A, 5.00%, 05/15/31		1,000		1,235,211
				2,121,987
Utilities — 0.2%
City of Richmond Virginia Public Utility Revenue, Refunding RB, 5.00%, 01/15/26		500		589,442
Total Municipal Bonds in Virginia				6,201,331
Washington — 3.4%
County/City/Special District/School District — 0.1%
Central Puget Sound Regional Transit Authority, Refunding RB, Series S-1, 5.00%, 11/01/25(b)		485		567,823
State — 1.5%
State of Washington, GO, Series A, 5.00%, 08/01/43		1,250		1,544,720
State of Washington, Refunding GO
Series B, 5.00%, 07/01/23		1,000		1,070,945
Series B, 5.00%, 07/01/30		1,000		1,168,721
Series R, 5.00%, 07/01/31		1,000		1,129,025
				4,913,411
Transportation — 1.1%
Central Puget Sound Regional Transit Authority, RB, Series S-1, 5.00%, 11/01/46		1,000		1,551,377
Port of Seattle Washington, Refunding RB, Series A, 5.00%, 08/01/31		2,000		2,053,006
				3,604,383
Utilities — 0.7%
County of King Washington Sewer Revenue, Refunding RB, Series B, 5.00%, 07/01/23(b)		2,075		2,221,886
Total Municipal Bonds in Washington				11,307,503

Security	Par (000)		Value
Wisconsin — 1.2%
Health — 0.4%
Wisconsin Health & Educational Facilities Authority, Refunding RB, Series A, 5.00%, 11/15/39	$	1,000	$	1,169,116
State — 0.8%
State of Wisconsin, Refunding GO 5.00%, 11/01/27		770		942,149
5.00%, 11/01/29		525		640,332
Series 2, 5.00%, 11/01/26		980		1,182,296
				2,764,777
Total Municipal Bonds in Wisconsin				3,933,893
Total Long-Term Investments —98.8% (Cost: $300,045,711)				324,153,695
	Shares
Short-Term Securities
Money Market Funds — 0.2%
BlackRock Liquidity Funds, MuniCash, Institutional Class, 0.01%(e)(f)		725,011		725,084
Total Short-Term Securities — 0.2% (Cost: $725,084)				725,084
Total Investments — 99.0% (Cost: $300,770,795)				324,878,779
Other Assets Less Liabilities — 1.0%				3,351,800
Net Assets — 100.0%			$	328,230,579

^(a) Security is collateralized by municipal bonds or U.S. Treasury obligations.

^(b) U.S. Government securities held in escrow, are used to pay interest on this security as well as to retire the bond in full at the date indicated, typically at a premium to par.

^(c) Zero-coupon bond.

^(d) Variable rate security. Interest rate resets periodically. The rate shown is the effective interest rate as of period end. Security description also includes the reference rate and spread if published and available.

^(e) Affiliate of the Fund.

^(f) Annualized 7-day yield as of period end.

Affiliates

Investments in issuers considered to be affiliate(s) of the Fund during the year ended December 31, 2021 for purposes of Section 2(a)(3) of the Investment Company Act of 1940, as amended, were as follows:

Affiliated Issuer	Value at 12/31/20		Purchases at Cost		Proceeds from Sales			Net Realized Gain (Loss)		Change in Unrealized Appreciation (Depreciation)			Value at 12/31/21		Shares Held at 12/31/21		Income		Capital Gain Distributions from Underlying Funds
BlackRock Liquidity Funds, MuniCash, Institutional Class	$	4,146,259	$	—	$	(3,420,852	)(a)	$	1,274	$	(1,597	)	$	725,084		725,011	$	401	$	—

^(a) Represents net amount purchased (sold).

FUND  SCHEDULES   OF  INVESTMENTS 23

Schedule of Investments   (continued) December 31, 2021 iShares Municipal Bond Index Fund

Fair Value Hierarchy as of Period End

Various inputs are used in determining the fair value of financial instruments. For a description of the input levels and information about the Fund’s policy regarding valuation of financial instruments, refer to the Notes to Financial Statements.

The following table summarizes the Fund’s financial instruments categorized in the fair value hierarchy. The breakdown of the Fund’s financial instruments into major categories is disclosed in the Schedule of Investments above.

	Level 1		Level 2		Level 3		Total
Assets
Investments
Long-Term Investments
Municipal Bonds	$	—	$	324,153,695	$	—	$	324,153,695
Short-Term Securities
Money Market Funds		725,084		—		—		725,084
	$	725,084	$	324,153,695	$	—	$	324,878,779

See notes to financial statements.

24 2 0 2 1   BLACK ROCK   ANNUAL   REPORT   TO   SHAREHOLDERS

Schedule of Investments December 31, 2021 iShares Short-Term TIPS Bond Index Fund (Percentages shown are based on Net Assets)

Security	Par (000)		Value
U.S. Treasury Obligations
U.S. Treasury Inflation Protected Security 0.13%, 01/15/22 - 10/15/26	$	57,964	$	61,187,119
0.63%, 04/15/23 - 01/15/26		14,534		15,486,230
0.38%, 07/15/23 - 07/15/25		12,724		13,584,161
0.50%, 04/15/24		2,956		3,150,819
0.25%, 01/15/25		6,085		6,518,870
2.38%, 01/15/25		2,142		2,438,882
Total Long-Term Investments — 97.8% (Cost: $100,740,697)				102,366,081

Security	Shares		Value
Short-Term Securities
Money Market Funds — 2.7%
BlackRock Cash Funds: Treasury, SL Agency Shares, 0.01%(a)(b)		2,879,900	$	2,879,900
Total Short-Term Securities — 2.7% (Cost: $2,879,900)				2,879,900
Total Investments — 100.5% (Cost: $103,620,597)				105,245,981
Liabilities in Excess of Other Assets — (0.5)%				(527,335	)
Net Assets — 100.0%			$	104,718,646

^(a) Affiliate of the Fund.

^(b) Annualized 7-day yield as of period end.

Affiliates

Investments in issuers considered to be affiliate(s) of the Fund during the year ended December 31, 2021 for purposes of Section 2(a)(3) of the Investment Company Act of 1940, as amended, were as follows:

Affiliated Issuer	Value at 12/31/20		Purchases at Cost			Proceeds from Sales		Net Realized Gain (Loss)		Change in Unrealized Appreciation (Depreciation)		Value at 12/31/21		Shares Held at 12/31/21		Income			Capital Gain Distributions from Underlying Funds
BlackRock Cash Funds: Treasury, SL Agency Shares	$	2,084,465	$	795,435	(a)	$	—	$	—	$	—	$	2,879,900		2,879,900	$	2,175	(b)	$	—

^(a) Represents net amount purchased (sold).

^(b) All or a portion represents securities lending income earned from the reinvestment of cash collateral from loaned securities, net of fees and collateral investment expenses, and other payments to and from borrowers of securities.

Fair Value Hierarchy as of Period End

Various inputs are used in determining the fair value of financial instruments. For a description of the input levels and information about the Fund’s policy regarding valuation of financial instruments, refer to the Notes to Financial Statements.

The following table summarizes the Fund’s financial instruments categorized in the fair value hierarchy. The breakdown of the Fund’s financial instruments into major categories is disclosed in the Schedule of Investments above.

	Level 1		Level 2		Level 3		Total
Assets
Investments
Long-Term Investments
U.S. Treasury Obligations	$	—	$	102,366,081	$	—	$	102,366,081
Short-Term Securities
Money Market Funds		2,879,900		—		—		2,879,900
	$	2,879,900	$	102,366,081	$	—	$	105,245,981

See notes to financial statements.

FUND  SCHEDULES   OF  INVESTMENTS 25

Schedule of Investments December 31, 2021 iShares MSCI EAFE International Index Fund (Percentages shown are based on Net Assets)

Security	Shares		Value
Common Stocks
Australia — 7.3%
Afterpay Ltd.(a)		105,803	$	6,387,028
Ampol Ltd.		117,320		2,533,284
APA Group(b)		582,894		4,264,328
Aristocrat Leisure Ltd.		293,252		9,302,703
ASX Ltd.		94,725		6,401,912
Aurizon Holdings Ltd.		891,440		2,264,817
AusNet Services Ltd.		956,400		1,789,120
Australia & New Zealand Banking Group Ltd.		1,389,824		27,840,026
BHP Group Ltd.		1,440,293		43,484,929
BHP Group PLC		1,031,099		30,680,060
BlueScope Steel Ltd.		249,072		3,802,419
Brambles Ltd.		708,527		5,481,394
Cochlear Ltd.		32,297		5,069,026
Coles Group Ltd.		649,903		8,479,988
Commonwealth Bank of Australia		866,102		63,668,267
Computershare Ltd.		268,510		3,908,738
Crown Resorts Ltd.(a)		183,048		1,593,410
CSL Ltd.		233,457		49,376,207
Dexus		530,056		4,285,961
Domino’s Pizza Enterprises Ltd.		29,220		2,507,997
Endeavour Group Ltd.		665,955		3,268,077
Evolution Mining Ltd.		907,192		2,691,446
Fortescue Metals Group Ltd.		823,145		11,570,745
Glencore PLC(a)		4,874,993		24,839,443
Goodman Group		811,712		15,647,223
GPT Group		950,537		3,748,152
IDP Education Ltd.		100,244		2,525,373
Insurance Australia Group Ltd.		1,218,796		3,777,075
Lendlease Corp. Ltd.(b)		331,413		2,580,560
Macquarie Group Ltd.		171,054		25,570,049
Magellan Financial Group Ltd.		65,625		1,014,071
Medibank Pvt Ltd.		1,325,490		3,228,365
Mirvac Group		1,941,960		4,110,690
National Australia Bank Ltd.		1,607,646		33,755,908
Newcrest Mining Ltd.		399,100		7,147,924
Northern Star Resources Ltd.		546,849		3,760,870
Orica Ltd.		196,302		1,957,575
Origin Energy Ltd.		874,231		3,336,491
Qantas Airways Ltd.(a)		448,876		1,637,437
QBE Insurance Group Ltd.		721,911		5,961,348
Ramsay Health Care Ltd.		90,100		4,682,501
REA Group Ltd.		25,435		3,101,584
Reece Ltd.		142,733		2,807,017
Rio Tinto Ltd.		181,522		13,246,056
Santos Ltd.		1,570,797		7,235,832
Scentre Group		2,542,244		5,848,120
SEEK Ltd.		161,663		3,853,992
Sonic Healthcare Ltd.		221,798		7,522,573
South32 Ltd.		2,271,160		6,642,194
Stockland		1,180,549		3,642,011
Suncorp Group Ltd.		617,486		4,971,428
Sydney Airport(a)(b)		636,448		4,018,201
Tabcorp Holdings Ltd.		1,069,255		3,906,318
Telstra Corp. Ltd.		2,038,194		6,194,473
Transurban Group(b)		1,488,851		14,954,457
Treasury Wine Estates Ltd.		348,274		3,140,156
Vicinity Centres		1,890,498		2,325,000
Washington H Soul Pattinson & Co. Ltd.		104,210		2,245,996
Wesfarmers Ltd.		553,533		23,882,974
Westpac Banking Corp.		1,790,982		27,784,419

Security	Shares		Value
Australia (continued)
WiseTech Global Ltd.		70,375	$	2,984,704
Woodside Petroleum Ltd.		470,277		7,497,137
Woolworths Group Ltd.		618,860		17,107,474
				624,845,053
Austria — 0.2%
Erste Group Bank AG		167,860		7,869,338
OMV AG		70,882		4,008,570
Raiffeisen Bank International AG		72,372		2,125,604
Verbund AG		33,646		3,781,280
voestalpine AG		56,256		2,041,146
				19,825,938
Belgium — 0.8%
Ageas SA		84,274		4,364,318
Anheuser-Busch InBev SA/NV		371,983		22,426,837
Elia Group SA/NV		15,411		2,031,259
Etablissements Franz Colruyt NV		25,552		1,084,234
Groupe Bruxelles Lambert SA		55,276		6,173,602
KBC Group NV		121,514		10,440,633
Proximus SADP		74,741		1,459,673
Sofina SA		7,626		3,745,950
Solvay SA		35,670		4,146,847
UCB SA		61,731		7,045,110
Umicore SA		94,873		3,870,287
				66,788,750
Chile — 0.0%
Antofagasta PLC		189,795		3,451,839
China — 0.2%
BOC Hong Kong Holdings Ltd.		1,814,034		5,949,132
Budweiser Brewing Co. APAC Ltd.(c)		857,600		2,254,592
Chow Tai Fook Jewellery Group Ltd.(a)		980,400		1,766,562
Futu Holdings Ltd., ADR(a)(d)		27,094		1,173,170
Wilmar International Ltd.		957,983		2,948,262
				14,091,718
Denmark — 2.7%
Ambu A/S, B Shares		80,632		2,128,184
AP Moeller - Maersk A/S, Class A		1,542		5,115,683
AP Moeller - Maersk A/S, Class B		2,820		10,065,461
Carlsberg A/S, Class B		49,015		8,462,329
Chr Hansen Holding A/S		50,768		4,003,077
Coloplast A/S, Class B		57,782		10,173,978
Danske Bank A/S		337,829		5,832,278
Demant A/S(a)		52,008		2,663,129
DSV A/S		99,591		23,207,517
Genmab A/S(a)		32,094		12,810,416
GN Store Nord A/S		61,450		3,855,727
Novo Nordisk A/S, Class B		822,086		92,341,520
Novozymes A/S, B Shares		100,290		8,234,792
Orsted A/S(c)		92,610		11,860,291
Pandora A/S		48,920		6,085,201
Rockwool International A/S, B Shares		4,063		1,774,222
Tryg A/S		177,378		4,377,266
Vestas Wind Systems A/S		493,010		15,014,681
				228,005,752
Finland — 1.2%
Elisa OYJ		70,091		4,315,918
Fortum OYJ		217,222		6,662,292
Kesko OYJ, B Shares		131,457		4,381,566
Kone OYJ, Class B		166,452		11,944,374
Neste OYJ		207,675		10,220,884

26 2 0 2 1   BLACK ROCK   ANNUAL   REPORT   TO   SHAREHOLDERS

Schedule of Investments   (continued) December 31, 2021 iShares MSCI EAFE International Index Fund (Percentages shown are based on Net Assets)

Security	Shares		Value
Finland (continued)
Nokia OYJ(a)		2,632,186	$	16,671,437
Nordea Bank Abp		1,581,727		19,294,770
Orion OYJ, Class B		51,063		2,121,094
Sampo OYJ, A Shares		244,076		12,215,521
Stora Enso OYJ, R Shares		285,467		5,239,276
UPM-Kymmene OYJ		259,545		9,875,323
Wartsila OYJ Abp		227,835		3,195,561
				106,138,016
France — 11.1%
Accor SA(a)		84,247		2,730,732
Aeroports de Paris(a)(d)		14,626		1,886,807
Air Liquide SA		231,281		40,336,400
Airbus SE(a)		287,798		36,821,975
Alstom SA		154,900		5,500,567
Amundi SA(c)		29,251		2,412,752
Arkema SA		30,571		4,314,932
AXA SA		944,914		28,123,718
BioMerieux		19,938		2,835,156
BNP Paribas SA		549,129		37,967,343
Bollore SA		425,399		2,379,499
Bouygues SA		112,818		4,038,433
Bureau Veritas SA		141,519		4,698,279
Capgemini SE		78,280		19,184,899
Carrefour SA		309,078		5,666,476
Cie de Saint-Gobain		246,992		17,375,036
Cie Generale des Etablissements Michelin SCA		82,803		13,561,823
CNP Assurances		82,617		2,043,542
Covivio		25,036		2,055,099
Credit Agricole SA		606,406		8,645,717
Danone SA		318,916		19,823,646
Dassault Aviation SA		12,174		1,316,705
Dassault Systemes SE		324,556		19,260,887
Edenred		120,947		5,585,133
Eiffage SA		41,059		4,233,335
Electricite de France SA		230,814		2,714,670
Engie SA		892,695		13,216,689
EssilorLuxottica SA		140,178		29,840,642
Eurazeo SE		19,159		1,671,532
Faurecia SE		56,471		2,686,665
Gecina SA		22,099		3,092,329
Getlink SE		211,770		3,507,394
Hermes International		15,461		27,016,136
Ipsen SA		18,820		1,722,213
Kering SA		36,620		29,382,113
Klepierre SA(a)		99,336		2,350,511
La Francaise des Jeux SAEM(c)		46,840		2,075,841
Legrand SA		130,566		15,292,025
L’Oreal SA		122,513		58,415,750
LVMH Moet Hennessy Louis Vuitton SE		135,531		112,007,375
Orange SA		973,966		10,404,078
Orpea SA		25,121		2,519,339
Pernod Ricard SA		102,277		24,605,559
Publicis Groupe SA		111,984		7,544,814
Remy Cointreau SA		11,027		2,680,322
Renault SA(a)		92,514		3,209,342
Safran SA		166,860		20,427,530
Sanofi		555,119		55,702,835
Sartorius Stedim Biotech		13,501		7,414,825
Schneider Electric SE		263,908		51,883,098
SEB SA		13,714		2,137,064
Societe Generale SA		396,236		13,618,120
Sodexo SA(a)		43,731		3,833,807

Security	Shares		Value
France (continued)
Suez SA		173,699	$	3,917,551
Teleperformance		28,675		12,819,904
Thales SA		51,346		4,367,826
TotalEnergies SE		1,224,588		62,331,784
Ubisoft Entertainment SA(a)		45,185		2,204,135
Unibail-Rodamco-Westfield(a)(d)		61,821		4,326,187
Valeo		110,521		3,332,913
Veolia Environnement SA		320,001		11,751,679
Vinci SA		262,589		27,733,280
Vivendi SE		375,939		5,085,291
Wendel SE		13,339		1,598,351
Worldline SA(a)(c)		116,259		6,470,994
				949,711,404
Germany — 8.1%
Adidas AG		92,950		26,764,510
Allianz SE, Registered Shares		201,279		47,473,385
BASF SE		448,395		31,470,761
Bayer AG, Registered Shares		479,613		25,613,388
Bayerische Motoren Werke AG		161,639		16,170,725
Bechtle AG		39,418		2,804,968
Beiersdorf AG		49,496		5,073,590
Brenntag SE		75,492		6,817,215
Carl Zeiss Meditec AG		19,371		4,063,577
Commerzbank AG(a)		495,331		3,747,463
Continental AG, Class A(a)		53,845		5,657,248
Covestro AG(c)		94,647		5,825,331
Daimler AG, Registered Shares		417,830		31,923,943
Daimler Truck Holding AG(a)		207,371		7,623,404
Delivery Hero SE(a)(c)		78,733		8,714,998
Deutsche Bank AG, Registered Shares(a)		1,010,706		12,588,357
Deutsche Boerse AG		92,757		15,488,044
Deutsche Lufthansa AG, Registered Shares(a)(d)		287,691		2,014,396
Deutsche Post AG, Registered Shares		483,920		31,126,098
Deutsche Telekom AG, Registered Shares		1,627,158		30,065,789
E.ON SE		1,096,053		15,232,329
Evonik Industries AG		100,928		3,260,527
Fresenius Medical Care AG & Co. KGaA		100,324		6,503,824
Fresenius SE & Co. KGaA		203,865		8,194,024
GEA Group AG		73,840		4,033,095
Hannover Rueck SE		29,552		5,602,955
HeidelbergCement AG		73,104		4,947,462
HelloFresh SE(a)		80,519		6,170,819
Henkel AG & Co. KGaA		50,015		3,898,724
Infineon Technologies AG		637,542		29,351,449
KION Group AG		34,730		3,793,408
Knorr-Bremse AG		34,913		3,448,164
LANXESS AG		39,984		2,472,558
LEG Immobilien SE		35,428		4,939,469
Merck KGaA		63,095		16,231,634
MTU Aero Engines AG		26,225		5,324,824
Muenchener Rueckversicherungs-Gesellschaft AG in Muenchen, Registered Shares		68,395		20,190,796
Nemetschek SE		28,583		3,654,736
Puma SE		51,630		6,305,274
Rational AG		2,474		2,530,317
Rwe AG		314,235		12,731,713
SAP SE		509,785		71,746,887
Scout24 AG(c)		42,221		2,948,136
Siemens AG, Registered Shares		373,468		64,685,696
Siemens Energy AG(a)		196,232		5,006,720
Siemens Healthineers AG(c)		137,083		10,220,798
Symrise AG		62,809		9,289,114

FUND  SCHEDULES   OF  INVESTMENTS 27

Schedule of Investments   (continued) December 31, 2021 iShares MSCI EAFE International Index Fund (Percentages shown are based on Net Assets)

Security	Shares		Value
Germany (continued)
Telefonica Deutschland Holding AG		501,074	$	1,389,873
Uniper SE		45,514		2,161,010
United Internet AG, Registered Shares		48,127		1,908,056
Volkswagen AG(d)		15,958		4,665,062
Vonovia SE		360,173		19,846,310
Zalando SE(a)(c)		109,114		8,789,839
				692,502,792
Hong Kong — 2.5%
AIA Group Ltd.		5,905,483		59,603,098
CK Asset Holdings Ltd.		982,589		6,198,136
CK Infrastructure Holdings Ltd.		326,844		2,082,392
CLP Holdings Ltd.		810,761		8,192,553
ESR Cayman Ltd.(a)(c)		987,200		3,339,311
Galaxy Entertainment Group Ltd.(a)		1,066,058		5,530,284
Hang Lung Properties Ltd.		1,024,565		2,107,588
Hang Seng Bank Ltd.		373,648		6,842,079
Henderson Land Development Co. Ltd.		722,774		3,083,045
HK Electric Investments & HK Electric Investments Ltd., Class SS(b)		1,319,116		1,294,155
HKT Trust & HKT Ltd., Class SS(b)		1,850,417		2,486,351
Hong Kong & China Gas Co. Ltd.		5,521,383		8,612,054
Hong Kong Exchanges & Clearing Ltd.		560,543		32,782,777
Hongkong Land Holdings Ltd.		581,093		3,021,460
Jardine Matheson Holdings Ltd.		105,986		5,827,917
Link REIT		1,025,243		9,031,641
Melco Resorts & Entertainment Ltd., ADR(a)		106,328		1,082,419
MTR Corp. Ltd.(d)		764,533		4,104,053
New World Development Co. Ltd.		760,824		3,012,311
Power Assets Holdings Ltd.		684,618		4,267,447
Sino Land Co. Ltd.		1,651,975		2,056,970
SITC International Holdings Co. Ltd.		670,000		2,423,180
Sun Hung Kai Properties Ltd.		636,088		7,718,450
Swire Pacific Ltd., Class A		251,200		1,428,823
Swire Properties Ltd.		579,736		1,453,329
Techtronic Industries Co. Ltd.		672,131		13,398,862
WH Group Ltd.(c)		4,446,107		2,791,056
Wharf Real Estate Investment Co. Ltd.		823,245		4,183,106
Xinyi Glass Holdings Ltd.		921,000		2,306,941
				210,261,788
Ireland — 1.1%
CRH PLC		380,299		20,133,035
Experian PLC		450,092		22,169,670
Flutter Entertainment PLC(a)		81,539		12,908,736
James Hardie Industries PLC		216,414		8,711,127
Kerry Group PLC, Class A		77,399		9,985,683
Kingspan Group PLC		75,195		8,969,633
Smurfit Kappa Group PLC		120,289		6,629,895
				89,507,779
Isle of Man — 0.1%
Entain PLC(a)		286,176		6,541,031
Israel — 0.7%
Azrieli Group Ltd.		20,426		1,948,856
Bank Hapoalim BM		546,744		5,627,066
Bank Leumi Le-Israel BM		699,272		7,500,401
Check Point Software Technologies Ltd.(a)		52,808		6,155,301
CyberArk Software Ltd.(a)(d)		19,136		3,315,886
Elbit Systems Ltd.		12,868		2,224,291
Fiverr International Ltd.(a)(d)		14,040		1,596,348
ICL Group Ltd.		340,539		3,280,109
Inmode Ltd.(a)		25,258		1,782,710

Security	Shares		Value
Israel (continued)
Isracard Ltd.		1	$	3
Israel Discount Bank Ltd., Class A		560,236		3,761,572
Kornit Digital Ltd.(a)(d)		22,850		3,478,913
Mizrahi Tefahot Bank Ltd.		67,712		2,607,631
Nice Ltd.(a)		30,815		9,344,820
Teva Pharmaceutical Industries Ltd., ADR(a)		542,363		4,344,328
Wix.com Ltd.(a)		27,594		4,354,057
				61,322,292
Italy — 2.0%
Amplifon SpA		59,928		3,224,615
Assicurazioni Generali SpA		542,303		11,461,421
Atlantia SpA(a)		243,513		4,831,728
Davide Campari-Milano NV		256,494		3,742,829
DiaSorin SpA		12,117		2,305,211
Enel SpA		3,970,643		31,749,571
Eni SpA		1,232,159		17,124,266
Ferrari NV		61,537		15,839,988
FinecoBank Banca Fineco SpA		293,542		5,140,660
Infrastrutture Wireless Italiane SpA(c)		164,606		1,996,019
Intesa Sanpaolo SpA		8,062,947		20,825,973
Mediobanca Banca di Credito Finanziario SpA		307,830		3,534,035
Moncler SpA		100,208		7,241,855
Nexi SpA(a)(c)		226,816		3,594,212
Poste Italiane SpA(c)		251,450		3,294,061
Prysmian SpA		125,278		4,712,476
Recordati Industria Chimica e Farmaceutica SpA		50,326		3,231,637
Snam SpA		988,137		5,951,721
Telecom Italia SpA/Milano		4,795,703		2,359,373
Terna SPA		690,545		5,586,260
UniCredit SpA		1,040,522		15,994,221
				173,742,132
Japan — 22.3%
Advantest Corp.		97,400		9,223,696
Aeon Co. Ltd.		319,246		7,523,409
AGC, Inc.		95,148		4,545,512
Aisin Corp.		71,846		2,756,554
Ajinomoto Co., Inc.		228,054		6,942,445
ANA Holdings, Inc.(a)		76,911		1,607,815
Asahi Group Holdings Ltd.		222,302		8,653,945
Asahi Intecc Co. Ltd.		105,700		2,270,815
Asahi Kasei Corp.		614,568		5,789,444
Astellas Pharma, Inc.		908,943		14,793,528
Azbil Corp.		59,500		2,713,708
Bandai Namco Holdings, Inc.		97,504		7,623,679
Benefit One Inc.		38,400		1,649,838
Bridgestone Corp.		277,341		11,906,984
Brother Industries Ltd.		116,563		2,246,694
Canon, Inc.		490,048		11,954,064
Capcom Co. Ltd.		85,400		2,011,284
Central Japan Railway Co.		70,240		9,346,974
Chiba Bank Ltd.		259,470		1,484,303
Chubu Electric Power Co., Inc.		319,711		3,376,951
Chugai Pharmaceutical Co. Ltd.		326,430		10,640,312
Concordia Financial Group Ltd.		540,070		1,961,291
Cosmos Pharmaceutical Corp.		9,800		1,440,726
CyberAgent, Inc.		194,716		3,245,881
Dai Nippon Printing Co. Ltd.		109,068		2,744,894
Daifuku Co. Ltd.		48,776		3,988,650
Dai-ichi Life Holdings, Inc.		490,400		9,891,352
Daiichi Sankyo Co. Ltd.		855,462		21,772,719
Daikin Industries Ltd.		121,668		27,560,135

28 2 0 2 1   BLACK ROCK   ANNUAL   REPORT   TO   SHAREHOLDERS

Schedule of Investments   (continued) December 31, 2021 iShares MSCI EAFE International Index Fund (Percentages shown are based on Net Assets)

Security	Shares		Value
Japan (continued)
Daito Trust Construction Co. Ltd.		32,370	$	3,713,521
Daiwa House Industry Co. Ltd.		276,476		7,945,666
Daiwa House REIT Investment Corp.		1,057		3,202,056
Daiwa Securities Group, Inc.		695,252		3,923,301
Denso Corp.		211,590		17,534,637
Dentsu Group, Inc.		106,882		3,804,275
Disco Corp.		14,259		4,358,299
East Japan Railway Co.		147,244		9,051,901
Eisai Co. Ltd.		116,015		6,585,917
ENEOS Holdings, Inc.		1,503,763		5,617,774
FANUC Corp.		93,651		19,906,634
Fast Retailing Co. Ltd.		28,441		16,167,131
Fuji Electric Co. Ltd.		61,094		3,337,448
FUJIFILM Holdings Corp.		176,108		13,055,634
Fujitsu Ltd.		96,004		16,496,028
GLP J-REIT		2,067		3,572,846
GMO Payment Gateway, Inc.		20,800		2,590,154
Hakuhodo DY Holdings, Inc.		112,492		1,871,861
Hamamatsu Photonics KK		69,087		4,412,578
Hankyu Hanshin Holdings, Inc.		113,663		3,230,161
Hikari Tsushin, Inc.		10,306		1,587,202
Hino Motors Ltd.		137,521		1,133,993
Hirose Electric Co. Ltd.		15,592		2,620,383
Hitachi Construction Machinery Co. Ltd.		53,505		1,546,023
Hitachi Ltd.		472,713		25,608,435
Hitachi Metals Ltd.(a)		104,886		1,943,438
Honda Motor Co. Ltd.		795,935		22,644,933
Hoshizaki Corp.		26,965		2,028,789
Hoya Corp.		180,478		26,781,443
Hulic Co. Ltd.		185,367		1,762,745
Ibiden Co. Ltd.		50,800		3,016,784
Idemitsu Kosan Co. Ltd.		100,800		2,572,391
Iida Group Holdings Co. Ltd.		71,922		1,672,722
Inpex Corp.		492,700		4,284,321
Isuzu Motors Ltd.		288,582		3,591,830
Ito En Ltd.		25,800		1,355,591
ITOCHU Corp.		580,273		17,752,801
Itochu Techno-Solutions Corp.		48,300		1,553,702
Japan Airlines Co. Ltd.(a)		70,162		1,331,907
Japan Exchange Group, Inc.		249,936		5,475,943
Japan Metropolitan Fund Invest		3,364		2,898,074
Japan Post Bank Co. Ltd.		202,400		1,855,328
Japan Post Holdings Co. Ltd.		1,191,829		9,284,671
Japan Post Insurance Co. Ltd.		108,300		1,739,716
Japan Real Estate Investment Corp.		618		3,508,155
Japan Tobacco, Inc.		587,441		11,861,573
JFE Holdings, Inc.		236,612		3,018,697
JSR Corp.		100,628		3,824,213
Kajima Corp.		216,277		2,485,567
Kakaku.com, Inc.		64,716		1,730,070
Kansai Electric Power Co., Inc.		349,651		3,268,182
Kansai Paint Co. Ltd.		88,475		1,923,977
Kao Corp.		232,007		12,151,204
KDDI Corp.		787,375		23,025,759
Keio Corp.		49,529		2,185,325
Keisei Electric Railway Co. Ltd.		64,787		1,752,651
Keyence Corp.		94,980		59,719,443
Kikkoman Corp.		71,264		6,001,216
Kintetsu Group Holdings Co. Ltd.(a)		82,598		2,308,996
Kirin Holdings Co. Ltd.		402,355		6,480,681
Kobayashi Pharmaceutical Co. Ltd.		26,465		2,081,671
Kobe Bussan Co. Ltd.		65,800		2,547,611
Koei Tecmo Holdings Co. Ltd.		28,300		1,111,190

Security	Shares		Value
Japan (continued)
Koito Manufacturing Co. Ltd.		50,347	$	2,666,581
Komatsu Ltd.		425,854		9,959,016
Konami Holdings Corp.		44,999		2,159,931
Kose Corp.		16,059		1,821,765
Kubota Corp.		499,089		11,097,768
Kurita Water Industries Ltd.		47,529		2,253,280
Kyocera Corp.		156,200		9,766,565
Kyowa Kirin Co. Ltd.		133,697		3,645,342
Lasertec Corp.		36,700		11,241,263
Lawson, Inc.		25,088		1,190,409
Lion Corp.		113,239		1,513,782
Lixil Corp.		132,027		3,522,075
M3, Inc.		214,213		10,800,911
Makita Corp.		110,239		4,679,609
Marubeni Corp.		763,864		7,442,325
Mazda Motor Corp.(a)		276,598		2,122,305
McDonald’s Holdings Co. Japan Ltd.		38,394		1,699,165
Medipal Holdings Corp.		87,098		1,632,645
MEIJI Holdings Co. Ltd.		58,834		3,512,022
Mercari, Inc.(a)		51,300		2,610,011
MINEBEA MITSUMI, Inc.		178,308		5,066,375
MISUMI Group, Inc.		139,356		5,725,019
Mitsubishi Chemical Holdings Corp.		616,209		4,570,650
Mitsubishi Corp.		616,497		19,575,689
Mitsubishi Electric Corp.		886,321		11,250,101
Mitsubishi Estate Co. Ltd.		577,382		8,009,722
Mitsubishi Gas Chemical Co., Inc.		79,893		1,354,304
Mitsubishi HC Capital, Inc.		329,773		1,631,563
Mitsubishi Heavy Industries Ltd.		158,605		3,667,011
Mitsubishi UFJ Financial Group, Inc.		5,967,570		32,477,153
Mitsui & Co. Ltd.		761,700		18,050,660
Mitsui Chemicals, Inc.		89,151		2,396,397
Mitsui Fudosan Co. Ltd.		446,120		8,842,442
Miura Co. Ltd.		43,100		1,483,737
Mizuho Financial Group, Inc.		1,177,651		14,957,641
MonotaRO Co. Ltd.		122,000		2,194,291
MS&AD Insurance Group Holdings, Inc.		217,524		6,698,062
Murata Manufacturing Co. Ltd.		280,425		22,367,388
NEC Corp.		120,474		5,570,682
Nexon Co. Ltd.		240,348		4,647,425
NGK Insulators Ltd.		127,468		2,157,396
Nidec Corp.		218,320		25,826,011
Nihon M&A Center Holdings, Inc.		150,100		3,681,824
Nintendo Co. Ltd.		54,682		25,583,362
Nippon Building Fund, Inc.		716		4,170,449
Nippon Express Co. Ltd.(a)(e)		37,870		2,243,624
Nippon Paint Holdings Co. Ltd.		342,280		3,737,968
Nippon Prologis REIT, Inc.		1,023		3,616,032
Nippon Sanso Holdings Corp.		75,693		1,655,606
Nippon Shinyaku Co. Ltd.		24,700		1,719,989
Nippon Steel Corp.		418,256		6,832,648
Nippon Telegraph & Telephone Corp.		628,432		17,186,522
Nippon Yusen KK		79,122		6,033,282
Nissan Chemical Corp.		58,911		3,426,265
Nissan Motor Co. Ltd.(a)		1,138,115		5,481,780
Nisshin Seifun Group, Inc.		99,973		1,442,248
Nissin Foods Holdings Co. Ltd.		30,541		2,228,985
Nitori Holdings Co. Ltd.		39,223		5,866,643
Nitto Denko Corp.		69,726		5,386,502
Nomura Holdings, Inc.		1,502,218		6,543,133
Nomura Real Estate Holdings, Inc.		59,858		1,379,245
Nomura Real Estate Master Fund, Inc.		2,042		2,873,784
Nomura Research Institute Ltd.		163,063		6,971,073

FUND  SCHEDULES   OF  INVESTMENTS 29

Schedule of Investments   (continued) December 31, 2021 iShares MSCI EAFE International Index Fund (Percentages shown are based on Net Assets)

Security	Shares		Value
Japan (continued)
NTT Data Corp.		308,517	$	6,618,066
Obayashi Corp.		314,634		2,435,060
Obic Co. Ltd.		34,194		6,399,379
Odakyu Electric Railway Co. Ltd.		141,885		2,637,852
Oji Holdings Corp.		388,226		1,880,977
Olympus Corp.		539,812		12,430,373
Omron Corp.		90,428		9,010,907
Ono Pharmaceutical Co. Ltd.		182,131		4,526,938
Open House Co. Ltd.		39,400		2,058,906
Oracle Corp. Japan		18,735		1,423,363
Oriental Land Co. Ltd.		97,604		16,458,677
ORIX Corp.		598,100		12,206,126
Orix JREIT, Inc.		1,262		1,972,818
Osaka Gas Co. Ltd.		186,708		3,088,013
Otsuka Corp.		55,382		2,640,759
Otsuka Holdings Co. Ltd.		190,755		6,939,841
Pan Pacific International Holdings Corp.		198,436		2,735,209
Panasonic Corp.		1,081,257		11,886,028
Persol Holdings Co. Ltd.		85,475		2,485,036
Pola Orbis Holdings, Inc.		45,823		763,676
Rakuten Group, Inc.(a)		427,500		4,289,218
Recruit Holdings Co. Ltd.		662,394		40,310,442
Renesas Electronics Corp.(a)		611,408		7,594,116
Resona Holdings, Inc.		1,027,699		3,993,820
Ricoh Co. Ltd.		322,681		3,007,744
Rinnai Corp.		17,835		1,609,540
Rohm Co. Ltd.		42,100		3,829,812
Ryohin Keikaku Co. Ltd.		125,060		1,906,917
Santen Pharmaceutical Co. Ltd.		176,249		2,151,779
SBI Holdings, Inc.		117,797		3,212,976
SCSK Corp.		75,800		1,508,585
Secom Co. Ltd.		102,557		7,126,302
Seiko Epson Corp.		134,603		2,424,255
Sekisui Chemical Co. Ltd.		182,878		3,058,477
Sekisui House Ltd.		301,399		6,484,822
Seven & i Holdings Co. Ltd.		367,859		16,181,378
SG Holdings Co. Ltd.		158,504		3,716,671
Sharp Corp.		106,169		1,219,304
Shimadzu Corp.		116,363		4,914,940
Shimano, Inc.		36,470		9,712,664
Shimizu Corp.		274,606		1,702,651
Shin-Etsu Chemical Co. Ltd.		172,926		30,015,693
Shionogi & Co. Ltd.		128,921		9,069,120
Shiseido Co. Ltd.		194,278		10,838,083
Shizuoka Bank Ltd.		214,801		1,533,469
SMC Corp.		27,941		18,884,147
Softbank Corp.		1,402,200		17,710,582
SoftBank Group Corp.		588,800		28,227,151
Sohgo Security Services Co. Ltd.		35,847		1,424,409
Sompo Holdings, Inc.		155,142		6,542,911
Sony Group Corp.		615,668		77,745,431
Square Enix Holdings Co. Ltd.		41,400		2,123,801
Stanley Electric Co. Ltd.		62,834		1,577,577
Subaru Corp.		301,546		5,387,966
SUMCO Corp.		160,115		3,260,387
Sumitomo Chemical Co. Ltd.		738,460		3,482,437
Sumitomo Corp.		549,840		8,137,297
Sumitomo Dainippon Pharma Co. Ltd.		84,293		972,523
Sumitomo Electric Industries Ltd.		370,780		4,839,043
Sumitomo Metal Mining Co. Ltd.		119,015		4,507,624
Sumitomo Mitsui Financial Group, Inc.		637,427		21,766,397
Sumitomo Mitsui Trust Holdings, Inc.		165,726		5,541,603

Security	Shares		Value
Japan (continued)
Sumitomo Realty & Development Co. Ltd.		148,949	$	4,391,140
Suntory Beverage & Food Ltd.		67,540		2,445,824
Suzuki Motor Corp.		180,019		6,942,043
Sysmex Corp.		81,422		10,990,465
T&D Holdings, Inc.		259,006		3,309,000
Taisei Corp.		91,910		2,794,991
Taisho Pharmaceutical Holdings Co. Ltd.		19,600		904,735
Takeda Pharmaceutical Co. Ltd.		772,408		21,093,142
TDK Corp.		189,774		7,406,097
Terumo Corp.		315,606		13,331,385
TIS, Inc.		107,700		3,202,572
Tobu Railway Co. Ltd.		90,898		2,074,288
Toho Co. Ltd.		54,382		2,327,131
Tokio Marine Holdings, Inc.		306,487		17,062,020
Tokyo Century Corp.		19,212		932,617
Tokyo Electric Power Co. Holdings, Inc.(a)		754,312		1,950,056
Tokyo Electron Ltd.		72,893		41,955,195
Tokyo Gas Co. Ltd.		182,655		3,278,725
Tokyu Corp.		248,065		3,297,697
Toppan Inc.		126,200		2,368,233
Toray Industries, Inc.		667,414		3,954,185
Toshiba Corp.		199,670		8,216,103
Tosoh Corp.		129,574		1,925,018
TOTO Ltd.		68,187		3,145,978
Toyo Suisan Kaisha Ltd.		42,723		1,811,386
Toyota Industries Corp.		71,900		5,751,493
Toyota Motor Corp.		5,177,145		95,687,024
Toyota Tsusho Corp.		104,481		4,816,232
Trend Micro, Inc.(a)		66,134		3,671,496
Tsuruha Holdings, Inc.		19,335		1,856,522
Unicharm Corp.		196,602		8,553,595
USS Co. Ltd.		105,563		1,649,286
Welcia Holdings Co. Ltd.		47,200		1,474,196
West Japan Railway Co.		103,940		4,347,074
Yakult Honsha Co. Ltd.		61,782		3,223,119
Yamaha Corp.		64,564		3,185,291
Yamaha Motor Co. Ltd.		147,327		3,538,663
Yamato Holdings Co. Ltd.		140,262		3,294,968
Yaskawa Electric Corp.		117,545		5,767,421
Yokogawa Electric Corp.		109,863		1,982,964
Z Holdings Corp.		1,308,227		7,548,457
ZOZO, Inc.		62,251		1,940,994
				1,904,533,112
Jordan — 0.0%
Hikma Pharmaceuticals PLC		83,302		2,501,646
Luxembourg — 0.3%
ArcelorMittal SA		329,046		10,555,348
Aroundtown SA		480,846		2,900,639
Eurofins Scientific SE		65,198		8,077,481
Tenaris SA		227,275		2,372,070
				23,905,538
Macau — 0.0%
Sands China Ltd.(a)		1,211,660		2,812,017
Malta — 0.0%
BGP Holdings Ltd.(a)(e)		966,939		11
Netherlands — 6.2%
ABN AMRO Bank NV(c)		203,588		2,992,682
Adyen NV(a)(c)		9,664		25,367,996
Aegon NV		861,215		4,281,577
Akzo Nobel NV		91,725		10,077,356

30 2 0 2 1   BLACK ROCK   ANNUAL   REPORT   TO   SHAREHOLDERS

Schedule of Investments   (continued) December 31, 2021 iShares MSCI EAFE International Index Fund (Percentages shown are based on Net Assets)

Security	Shares		Value
Netherlands (continued)
Argenx SE(a)		22,380	$	7,958,505
ASM International NV		22,997		10,151,276
ASML Holding NV		201,785		161,633,788
Euronext NV(c)		42,167		4,383,847
EXOR NV		53,325		4,773,529
Heineken Holding NV		56,544		5,213,630
Heineken NV		126,540		14,240,773
IMCD NV		27,824		6,149,190
ING Groep NV		1,905,920		26,498,010
JDE Peet’s NV		48,648		1,505,750
Just Eat Takeaway.com NV(a)(c)		87,919		4,776,717
Koninklijke Ahold Delhaize NV		510,516		17,519,039
Koninklijke DSM NV		85,329		19,216,628
Koninklijke KPN NV		1,627,035		5,056,994
Koninklijke Philips NV		447,868		16,576,313
NN Group NV		131,908		7,133,621
Prosus NV(a)		455,552		37,731,095
QIAGEN NV(a)		111,776		6,198,040
Randstad NV		59,047		4,028,023
Royal Dutch Shell PLC, A Shares		2,002,197		43,876,946
Royal Dutch Shell PLC, B Shares		1,797,535		39,467,701
Stellantis NV		993,728		18,760,170
Universal Music Group NV		354,085		9,989,453
Wolters Kluwer NV		130,600		15,371,733
				530,930,382
New Zealand — 0.3%
Auckland International Airport Ltd.(a)		602,462		3,171,259
Fisher & Paykel Healthcare Corp. Ltd.		281,927		6,316,168
Mercury NZ Ltd.		341,301		1,429,849
Meridian Energy Ltd.		634,997		2,107,727
Ryman Healthcare Ltd.		204,551		1,715,224
Spark New Zealand Ltd.		898,639		2,779,030
Xero Ltd.(a)		65,019		6,655,291
				24,174,548
Norway — 0.7%
Adevinta ASA(a)		132,652		1,762,158
Aker BP ASA		60,525		1,861,059
DNB Bank ASA		454,127		10,387,578
Equinor ASA		477,114		12,633,638
Gjensidige Forsikring ASA		98,626		2,392,758
Mowi ASA		211,551		5,006,720
Norsk Hydro ASA		647,270		5,093,100
Orkla ASA		361,488		3,623,396
Schibsted ASA, Class A		35,193		1,356,855
Schibsted ASA, B Shares		46,855		1,580,180
Telenor ASA		343,189		5,394,606
Yara International ASA		83,883		4,229,229
				55,321,277
Poland — 0.0%
InPost SA(a)		96,259		1,161,444
Portugal — 0.2%
Banco Espirito Santo SA, Registered Shares(a)(e)		47,542		—
EDP - Energias de Portugal SA		1,354,348		7,439,844
Galp Energia SGPS SA		241,255		2,340,931
Jeronimo Martins SGPS SA		137,226		3,140,258
				12,921,033
Singapore — 1.2%
Ascendas Real Estate Investment Trust		1,649,175		3,613,315
CapitaLand Integrated Commercial Trust		2,405,601		3,639,605

Security	Shares		Value
Singapore (continued)
Capitaland Investment Ltd.(a)		1,310,530	$	3,313,573
City Developments Ltd.		199,178		1,007,718
DBS Group Holdings Ltd.		884,209		21,414,618
Genting Singapore Ltd.(d)		2,959,825		1,702,517
Keppel Corp. Ltd.		714,742		2,718,165
Mapletree Commercial Trust		1,079,200		1,598,035
Mapletree Logistics Trust		1,502,141		2,118,523
Oversea-Chinese Banking Corp. Ltd.		1,652,987		13,990,463
Sea Ltd., ADR(a)		67,263		15,047,406
Singapore Airlines Ltd.(a)(d)		676,599		2,508,658
Singapore Exchange Ltd.		329,026		2,271,255
Singapore Technologies Engineering Ltd.		790,979		2,207,398
Singapore Telecommunications Ltd.		4,031,046		6,939,367
United Overseas Bank Ltd.		576,105		11,505,804
UOL Group Ltd.		224,399		1,181,191
Venture Corp. Ltd.		133,927		1,819,913
				98,597,524
Spain — 2.2%
ACS Actividades de Construccion y Servicios SA		121,421		3,237,212
Aena SME SA(a)(c)		36,762		5,789,424
Amadeus IT Group SA(a)		219,931		14,881,462
Banco Bilbao Vizcaya Argentaria SA		3,255,217		19,306,626
Banco Santander SA		8,465,583		28,114,847
CaixaBank SA		2,171,737		5,932,401
Cellnex Telecom SA(c)		248,732		14,408,447
EDP Renovaveis SA		138,694		3,448,968
Enagas SA		102,462		2,380,327
Endesa SA		157,288		3,620,994
Ferrovial SA		238,955		7,472,998
Grifols SA		149,130		2,869,656
Iberdrola SA		2,797,093		33,117,514
Industria de Diseno Textil SA		532,535		17,174,269
Naturgy Energy Group SA(d)		96,293		3,131,946
Red Electrica Corp. SA		180,542		3,904,110
Repsol SA		715,590		8,474,821
Siemens Gamesa Renewable Energy SA(a)		118,064		2,803,769
Telefonica SA		2,593,722		11,246,915
				191,316,706
Sweden — 3.7%
Alfa Laval AB		153,923		6,183,015
Assa Abloy AB, Class B		489,315		14,914,797
Atlas Copco AB, A Shares		327,829		22,653,253
Atlas Copco AB, B Shares		189,703		11,143,201
Boliden AB		134,236		5,176,103
Electrolux AB		108,554		2,629,142
Embracer Group AB(a)(d)		273,112		2,897,445
Epiroc AB, Class A		321,726		8,135,095
Epiroc AB, Class B		187,692		3,969,162
EQT AB		144,114		7,812,424
Essity AB, Class B		299,188		9,760,947
Evolution AB(c)		84,105		11,887,480
Fastighets AB Balder, B Shares(a)		52,021		3,743,637
Getinge AB		112,219		4,890,746
H & M Hennes & Mauritz AB, B Shares		356,597		6,997,184
Hexagon AB, B Shares		961,782		15,235,149
Husqvarna AB, B Shares		207,754		3,321,758
Industrivarden AB, A Shares		65,197		2,071,585
Industrivarden AB, C Shares		77,886		2,440,221
Investment AB Latour, B Shares		71,256		2,895,021
Investor AB		243,588		6,408,229
Investor AB, B Shares		889,457		22,319,416

FUND  SCHEDULES   OF  INVESTMENTS 31

Schedule of Investments   (continued) December 31, 2021 iShares MSCI EAFE International Index Fund (Percentages shown are based on Net Assets)

Security	Shares		Value
Sweden (continued)
Kinnevik AB, Class B(a)		116,431	$	4,139,543
L E Lundbergforetagen AB, B Shares		36,578		2,049,305
Lifco AB		115,376		3,446,124
Lundin Energy AB		99,108		3,546,358
Nibe Industrier AB, B Shares		693,466		10,478,226
Sagax AB, Class B		77,338		2,601,456
Sandvik AB		551,144		15,362,326
Securitas AB, B Shares		150,793		2,074,377
Sinch AB(a)(c)		253,106		3,193,775
Skandinaviska Enskilda Banken AB, Class A		797,395		11,070,677
Skanska AB, B Shares		163,733		4,231,045
SKF AB, B Shares		187,909		4,443,994
Svenska Cellulosa AB SCA, Class B		297,350		5,276,268
Svenska Handelsbanken AB, A Shares		711,314		7,687,840
Swedbank AB, A Shares		440,752		8,857,277
Swedish Match AB		773,270		6,138,745
Tele2 AB, B Shares		248,274		3,541,793
Telefonaktiebolaget LM Ericsson, B Shares		1,424,927		15,678,528
Telia Co. AB		1,305,188		5,104,542
Volvo AB, A Shares		97,974		2,298,225
Volvo AB, B Shares		697,930		16,140,669
				314,846,103
Switzerland — 10.6%
ABB Ltd., Registered Shares		801,866		30,561,339
Adecco Group AG, Registered Shares		74,585		3,800,654
Alcon, Inc.		243,950		21,517,695
Bachem Holding AG		2,976		2,330,346
Baloise Holding AG, Registered Shares		22,313		3,641,767
Barry Callebaut AG, Registered Shares		1,717		4,168,276
Chocoladefabriken Lindt & Spruengli AG		514		7,124,473
Chocoladefabriken Lindt & Spruengli AG, Registered Shares		53		7,107,770
Cie Financiere Richemont SA, Class A, Registered Shares		254,837		38,081,520
Clariant AG, Registered Shares(a)		103,845		2,157,150
Coca-Cola HBC AG(a)		99,461		3,443,869
Credit Suisse Group AG, Registered Shares		1,294,763		12,553,529
EMS-Chemie Holding AG, Registered Shares		3,666		4,097,050
Geberit AG, Registered Shares		17,514		14,276,251
Givaudan SA, Registered Shares		4,508		23,651,689
Holcim Ltd., Registered Shares(a)		256,015		13,020,675
Julius Baer Group Ltd.		107,718		7,203,345
Kuehne + Nagel International AG, Registered Shares		26,528		8,543,533
Logitech International SA, Registered Shares		84,509		7,089,259
Lonza Group AG, Registered Shares		36,355		30,268,735
Nestle SA, Registered Shares		1,374,264		191,871,013
Novartis AG, Registered Shares		1,069,621		93,989,709
Partners Group Holding AG		11,080		18,290,968
Roche Holding AG		358,626		149,291,730
Schindler Holding AG		19,967		5,359,741
Schindler Holding AG, Registered Shares		9,685		2,588,197
SGS SA, Registered Shares		2,944		9,814,402
Sika AG, Registered Shares		69,217		28,767,774
Sonova Holding AG, Registered Shares		26,723		10,443,262
STMicroelectronics NV		333,397		16,394,772
Straumann Holding AG, Registered Shares		5,071		10,723,091
Swatch Group AG		13,927		4,241,272
Swatch Group AG, Registered Shares		26,076		1,524,576
Swiss Life Holding AG, Registered Shares		15,408		9,413,931
Swiss Prime Site AG, Registered Shares		36,814		3,613,954
Swiss Re AG		147,250		14,535,556

Security	Shares		Value
Switzerland (continued)
Swisscom AG, Registered Shares		12,645	$	7,133,348
Temenos AG, Registered Shares		32,918		4,537,460
UBS Group AG, Registered Shares		1,717,123		30,821,127
VAT Group AG(c)		13,174		6,528,025
Vifor Pharma AG		23,463		4,168,149
Zurich Insurance Group AG		73,454		32,178,654
				900,869,636
United Arab Emirates — 0.0%
NMC Health PLC(a)(e)		45,379		1
United Kingdom — 12.7%
3i Group PLC		473,694		9,285,941
Abrdn PLC		1,080,370		3,519,860
Admiral Group PLC		95,329		4,080,503
Anglo American PLC		630,866		25,948,918
Ashtead Group PLC		218,461		17,611,132
Associated British Foods PLC		175,209		4,796,161
AstraZeneca PLC		756,268		88,308,912
Auto Trader Group PLC(c)		465,237		4,659,287
AVEVA Group PLC		57,980		2,675,325
Aviva PLC		1,909,553		10,644,177
BAE Systems PLC		1,570,053		11,708,186
Barclays PLC		8,263,731		21,049,876
Barratt Developments PLC		500,208		5,079,352
Berkeley Group Holdings PLC		55,614		3,601,292
BP PLC		9,822,844		44,012,443
British American Tobacco PLC		1,064,212		39,516,008
British Land Co. PLC		423,727		3,059,873
BT Group PLC		4,341,203		9,986,933
Bunzl PLC		164,830		6,439,133
Burberry Group PLC		199,045		4,912,878
CK Hutchison Holdings Ltd.		1,315,117		8,467,280
CNH Industrial NV		498,334		9,634,888
Coca-Cola European Partners PLC		100,532		5,622,755
Compass Group PLC(a)		870,952		19,608,338
Croda International PLC		67,915		9,302,416
DCC PLC		48,667		3,984,034
Diageo PLC		1,139,421		62,299,027
Evraz PLC		245,721		2,008,969
Ferguson PLC		108,686		19,305,527
GlaxoSmithKline PLC		2,456,449		53,483,649
Halma PLC		185,197		8,029,931
Hargreaves Lansdown PLC		176,713		3,247,307
HSBC Holdings PLC		9,971,926		60,223,037
Imperial Brands PLC		460,305		10,087,489
Informa PLC(a)		737,931		5,166,681
InterContinental Hotels Group PLC(a)		89,745		5,801,927
Intertek Group PLC		79,057		6,031,052
J Sainsbury PLC		847,406		3,167,574
JD Sports Fashion PLC		1,276,549		3,763,908
Johnson Matthey PLC		93,147		2,588,365
Kingfisher PLC		1,037,945		4,774,280
Land Securities Group PLC		340,947		3,598,341
Legal & General Group PLC		2,923,521		11,806,027
Lloyds Banking Group PLC		34,651,244		22,502,217
London Stock Exchange Group PLC		160,592		15,106,910
M&G PLC		1,251,324		3,385,223
Melrose Industries PLC		2,151,466		4,678,974
Mondi PLC		237,887		5,900,527
National Grid PLC		1,765,741		25,460,725
Natwest Group PLC		2,818,846		8,632,194
Next PLC		64,927		7,181,122

32 2 0 2 1   BLACK ROCK   ANNUAL   REPORT   TO   SHAREHOLDERS

Schedule of Investments   (continued) December 31, 2021 iShares MSCI EAFE International Index Fund (Percentages shown are based on Net Assets)

Security	Shares		Value
United Kingdom (continued)
Ocado Group PLC(a)		238,839	$	5,433,907
Pearson PLC		366,560		3,040,884
Persimmon PLC		156,246		6,055,941
Phoenix Group Holdings PLC		315,439		2,792,271
Prudential PLC		1,276,925		22,081,666
Reckitt Benckiser Group PLC		348,675		30,015,203
RELX PLC		944,063		30,820,732
Rentokil Initial PLC		907,869		7,186,458
Rio Tinto PLC		548,285		36,157,330
Rolls-Royce Holdings PLC(a)		4,088,566		6,824,371
Sage Group PLC		517,129		5,983,667
Schroders PLC		59,830		2,887,886
Segro PLC		582,915		11,344,534
Severn Trent PLC		122,878		4,906,754
Smith & Nephew PLC		429,223		7,490,959
Smiths Group PLC		191,001		4,088,429
Spirax-Sarco Engineering PLC		35,977		7,829,688
SSE PLC		511,346		11,431,227
St James’s Place PLC		264,269		6,039,136
Standard Chartered PLC		1,292,890		7,861,783
Taylor Wimpey PLC		1,754,821		4,183,718
Tesco PLC		3,774,567		14,860,748
Unilever PLC		1,266,925		67,966,025
United Utilities Group PLC		335,009		4,943,206
Vodafone Group PLC		13,524,053		20,370,413
Whitbread PLC(a)		97,205		3,954,069
WPP PLC		579,575		8,825,609
				1,081,123,498
Total Common Stocks — 98.4% (Cost: $5,906,008,562)				8,391,750,760
Preferred Securities
Preferred Stocks — 0.5%
Germany — 0.5%
Bayerische Motoren Werke AG, Preference Shares		27,970		2,319,457
Fuchs Petrolub SE, Preference Shares		33,901		1,531,953

Security	Shares		Value
Germany (continued)
Henkel AG & Co. KGaA, Preference Shares		86,993	$	7,019,559
Porsche Automobil Holding SE, Preference Shares		74,755		7,057,825
Sartorius AG, Preference Shares		12,764		8,632,804
Volkswagen AG, Preference Shares		90,601		18,200,210
				44,761,808
Total Preferred Securities — 0.5% (Cost: $32,186,952)				44,761,808
Total Long-Term Investments — 98.9% (Cost: $5,938,195,514)				8,436,512,568
Short-Term Securities
Money Market Funds — 0.5%
BlackRock Cash Funds: Institutional, SL Agency Shares, 0.10%(f)(g)(h)		17,805,845		17,811,186
BlackRock Cash Funds: Treasury, SL Agency Shares, 0.01%(f)(g)		25,217,563		25,217,563
Total Short-Term Securities — 0.5% (Cost: $43,030,352)				43,028,749
Total Investments — 99.4% (Cost: $5,981,225,866)				8,479,541,317
Other Assets Less Liabilities — 0.6%				47,875,977
Net Assets — 100.0%			$	8,527,417,294

^(a) Non-income producing security.

^(b) A security contractually bound to one or more other securities to form a single saleable unit which cannot be sold separately.

^(c) Security exempt from registration pursuant to Rule 144A under the Securities Act of 1933, as amended. These securities may be resold in transactions exempt from registration to qualified institutional investors.

^(d) All or a portion of this security is on loan.

^(e) Security is valued using significant unobservable inputs and is classified as Level 3 in the fair value hierarchy.

^(f) Affiliate of the Fund.

^(g) Annualized 7-day yield as of period end.

^(h) All or a portion of this security was purchased with the cash collateral from loaned securities.

Affiliates

Investments in issuers considered to be affiliate(s) of the Fund during the year ended December 31, 2021 for purposes of Section 2(a)(3) of the Investment Company Act of 1940, as amended, were as follows:

Affiliated Issuer	Value at 12/31/20		Purchases at Cost		Proceeds from Sales			Net Realized Gain (Loss)		Change in Unrealized Appreciation (Depreciation)			Value at 12/31/21		Shares Held at 12/31/21		Income			Capital Gain Distributions from Underlying Funds
BlackRock Cash Funds: Institutional, SL Agency Shares	$	30,455,641	$	—		$ (12,640,096	)(a)	$	10,791	$	(15,150	)	$	17,811,186		17,805,845	$	306,136	(b)	$	—
BlackRock Cash Funds: Treasury, SL Agency Shares		28,526,482		—		(3,308,919	)(a)		—		—			25,217,563		25,217,563		1,790			—
								$	10,791	$	(15,150	)	$	43,028,749			$	307,926		$	—

^(a) Represents net amount purchased (sold).

^(b) All or a portion represents securities lending income earned from the reinvestment of cash collateral from loaned securities, net of fees and collateral investment expenses, and other payments to and from borrowers of securities.

FUND  SCHEDULES   OF  INVESTMENTS 33

Schedule of Investments   (continued) December 31, 2021 iShares MSCI EAFE International Index Fund

Derivative Financial Instruments Outstanding as of Period End

Futures Contracts

Description	Number of Contracts		Expiration Date		Notional Amount (000)		Value/ Unrealized Appreciation (Depreciation)
Long Contracts
Nikkei 225 Index		145		03/10/22	$	18,152	$	127,892
SPI 200 Index		76		03/17/22		10,159		120,231
Euro Stoxx 50 Index		602		03/18/22		29,301		647,925
FTSE 100 Index		174		03/18/22		17,267		272,414
							$	1,168,462

Derivative Financial Instruments Categorized by Risk Exposure

As of period end, the fair values of derivative financial instruments located in the Statements of Assets and Liabilities were as follows:

	Commodity Contracts		Credit Contracts		Equity Contracts		Foreign Currency Exchange Contracts		Interest Rate Contracts		Other Contracts		Total
Assets — Derivative Financial Instruments
Futures contracts
Unrealized appreciation on futures contracts(a)	$	—	$	—	$	1,168,462	$	—	$	—	$	—	$	1,168,462

^(a) Net cumulative unrealized appreciation (depreciation) on futures contracts and centrally cleared swaps, if any, are reported in the Schedule of Investments. In the Statements of Assets and Liabilities, only current day’s variation margin is reported in receivables or payables and the net cumulative unrealized appreciation (depreciation) is included in accumulated earnings (loss).

For the period ended December 31, 2021, the effect of derivative financial instruments in the Statements of Operations was as follows:

	Commodity Contracts		Credit Contracts		Equity Contracts		Foreign Currency Exchange Contracts		Interest Rate Contracts		Other Contracts		Total
Net Realized Gain (Loss) from:
Futures contracts	$	—	$	—	$	7,940,992	$	—	$	—	$	—	$	7,940,992
Net Change in Unrealized Appreciation (Depreciation) on:
Futures contracts	$	—	$	—	$	266,476	$	—	$	—	$	—	$	266,476

Average Quarterly Balances of Outstanding Derivative Financial Instruments

Futures contracts:
Average notional value of contracts — long	$	94,380,691

For more information about the Fund’s investment risks regarding derivative financial instruments, refer to the Notes to Financial Statements.

Fair Value Hierarchy as of Period End

Various inputs are used in determining the fair value of financial instruments. For a description of the input levels and information about the Fund’s policy regarding valuation of financial instruments, refer to the Notes to Financial Statements.

The following table summarizes the Fund’s financial instruments categorized in the fair value hierarchy. The breakdown of the Fund’s financial instruments into major categories is disclosed in the Schedule of Investments above.

	Level 1		Level 2		Level 3		Total
Assets
Investments
Long-Term Investments
Common Stocks
Australia	$	—	$	624,845,053	$	—	$	624,845,053
Austria		—		19,825,938		—		19,825,938

34 2 0 2 1   BLACK ROCK   ANNUAL   REPORT   TO   SHAREHOLDERS

Schedule of Investments   (continued) December 31, 2021 iShares MSCI EAFE International Index Fund

Fair Value Hierarchy as of Period End (continued)

	Level 1		Level 2		Level 3		Total
Common Stocks (continued)
Belgium	$	—	$	66,788,750	$	—	$	66,788,750
Chile		—		3,451,839		—		3,451,839
China		1,173,170		12,918,548		—		14,091,718
Denmark		—		228,005,752		—		228,005,752
Finland		—		106,138,016		—		106,138,016
France		6,752,707		942,958,697		—		949,711,404
Germany		7,623,404		684,879,388		—		692,502,792
Hong Kong		4,484,162		205,777,626		—		210,261,788
Ireland		—		89,507,779		—		89,507,779
Isle of Man		—		6,541,031		—		6,541,031
Israel		25,027,543		36,294,749		—		61,322,292
Italy		—		173,742,132		—		173,742,132
Japan		—		1,902,289,488		2,243,624		1,904,533,112
Jordan		—		2,501,646		—		2,501,646
Luxembourg		—		23,905,538		—		23,905,538
Macau		—		2,812,017		—		2,812,017
Malta		—		—		11		11
Netherlands		15,046,447		515,883,935		—		530,930,382
New Zealand		—		24,174,548		—		24,174,548
Norway		1,580,180		53,741,097		—		55,321,277
Poland		1,161,444		—		—		1,161,444
Portugal		3,140,258		9,780,775		—		12,921,033
Singapore		15,047,406		83,550,118		—		98,597,524
Spain		—		191,316,706		—		191,316,706
Sweden		—		314,846,103		—		314,846,103
Switzerland		14,232,243		886,637,393		—		900,869,636
United Arab Emirates		—		—		1		1
United Kingdom		5,622,755		1,075,500,743		—		1,081,123,498
Preferred Securities
Preferred Stocks		—		44,761,808		—		44,761,808
Short-Term Securities
Money Market Funds		43,028,749		—		—		43,028,749
	$	143,920,468	$	8,333,377,213	$	2,243,636	$	8,479,541,317
Derivative Financial Instruments(a)
Assets
Equity Contracts	$	—	$	1,168,462	$	—	$	1,168,462

^(a) Derivative financial instruments are futures contracts. Futures contracts are valued at the unrealized appreciation (depreciation) on the instrument.    

See notes to financial statements.

FUND  SCHEDULES   OF  INVESTMENTS 35

Statements of Assets and Liabilities

December 31, 2021

	iShares Municipal Bond Index Fund		iShares Short-Term TIPS Bond Index Fund		iShares MSCI EAFE International Index Fund		iShares Russell 2000 Small-Cap Index Fund
ASSETS
Investments, at value — unaffiliated(a)(b)	$	324,153,695	$	102,366,081	$	8,436,512,568	$	—
Investments, at value — Master Small Cap Index Series		—		—		—		3,366,639,817
Investments, at value — affiliated(c)		725,084		2,879,900		43,028,749		—
Cash pledged for futures contracts		—		—		5,722,452		—
Foreign currency, at value(d)		—		—		62,205,044		—
Receivables:
Investments sold		—		1,152,910		2,224		—
Securities lending income — affiliated		—		232		7,771		—
Capital shares sold		143,753		444,645		10,845,093		3,223,313
Dividends — unaffiliated		—		—		19,858,271		—
Dividends — affiliated		11		11		77		—
Interest — unaffiliated		3,693,224		113,010		—		—
From the Manager		—		12,544		—		—
Withdrawals from the Master Portfolio		—		—		—		8,612,055
Prepaid expenses		53,181		10,392		11,195		37,588
Total assets		328,768,948		106,979,725		8,578,193,444		3,378,512,773
LIABILITIES
Bank overdraft		—		—		99,616		—
Collateral on securities loaned		—		—		17,836,635		—
Payables:
Investments purchased		163		2,140,870		21,215,434		—
Accounting services fees		2,997		3,018		—		1,655
Administration fees		—		—		278,534		112,201
Capital shares redeemed		243,996		31,696		10,511,674		11,835,368
Custodian fees		1,389		395		—		—
Income dividend distributions		42,936		43,083		—		—
Investment advisory fees		27,410		—		69,676		—
Directors’ and Officer’s fees		3,707		3,407		16,318		943
Recoupment of past waived fees		9,579		886		—		—
Other accrued expenses		27,993		8,913		270,304		15,530
Professional fees		56,663		25,933		91,259		18,873
Service fees		67,740		386		111,547		123,935
Transfer agent fees		53,796		2,492		17,984		205,517
Variation margin on futures contracts		—		—		257,169		—
Total liabilities		538,369		2,261,079		50,776,150		12,314,022
NET ASSETS	$	328,230,579	$	104,718,646	$	8,527,417,294	$	3,366,198,751
NET ASSETS CONSIST OF
Paid-in capital	$	303,764,607	$	103,220,022	$	7,284,742,363	$	2,505,835,934
Accumulated earnings		24,465,972		1,498,624		1,242,674,931		860,362,817
NET ASSETS	$	328,230,579	$	104,718,646	$	8,527,417,294	$	3,366,198,751
(a)  Investments, at cost — unaffiliated	$	300,045,711	$	100,740,697	$	5,938,195,514	$	—
(b)  Securities loaned, at value	$	—	$	—	$	17,089,493	$	—
(c)  Investments, at cost — affiliated	$	725,084	$	2,879,900	$	43,030,352	$	—
(d)  Foreign currency, at cost	$	—	$	—	$	62,204,078	$	—

36 2 0 2 1   BLACK ROCK  ANNUAL  REPORT  TO  SHAREHOLDERS

Statements of Assets and Liabilities  (continued)

December 31, 2021

	iShares Municipal Bond Index Fund		iShares Short-Term TIPS Bond Index Fund		iShares MSCI EAFE International Index Fund		iShares Russell 2000 Small-Cap Index Fund
NET ASSET VALUE
Institutional
Net assets	$	11,794,114	$	18,004,454	$	1,058,978,136	$	479,450,673
Shares outstanding		969,624		1,736,635		66,816,428		18,614,884
Net asset value	$	12.16	$	10.37	$	15.85	$	25.76
Shares authorized		Unlimited		Unlimited		1.208 billion		208 million
Par value	$	0.001	$	0.001	$	0.0001	$	0.0001
Investor A
Net assets	$	23,347,586	$	1,908,129	$	385,287,059	$	243,110,092
Shares outstanding		1,919,303		183,377		24,475,394		9,424,782
Net asset value	$	12.16	$	10.41	$	15.74	$	25.79
Shares authorized		Unlimited		Unlimited		208 million		208 million
Par value	$	0.001	$	0.001	$	0.0001	$	0.0001
Investor P
Net assets	$	292,982,960		N/A	$	153,681,703	$	354,746,053
Shares outstanding		24,085,269		N/A		9,797,418		13,803,434
Net asset value	$	12.16		N/A	$	15.69	$	25.70
Shares authorized		Unlimited		N/A		2 billion		2 billion
Par value	$	0.001		N/A	$	0.0001	$	0.0001
Class K
Net assets	$	105,919	$	84,806,063	$	6,929,470,396	$	2,288,891,933
Shares outstanding		8,707		8,149,726		436,832,436		88,579,259
Net asset value	$	12.16	$	10.41	$	15.86	$	25.84
Shares authorized		Unlimited		Unlimited		1.208 billion		1.208 billion
Par value	$	0.001	$	0.001	$	0.0001	$	0.0001

See notes to financial statements.

FUND   FINANCIAL  STATEMENTS 37

Statements of Operations

Year Ended December 31, 2021

	iShares Municipal Bond Index Fund			iShares Short-Term TIPS Bond Index Fund			iShares MSCI EAFE International Index Fund				iShares Russell 2000 Small-Cap Index Fund
INVESTMENT INCOME
Dividends — unaffiliated	$	—		$	—			$	209,159,208		$	—
Dividends — affiliated		401			226				3,094			—
Interest — unaffiliated		8,965,027			3,757,318				—			—
Securities lending income — affiliated — net		—			1,949				304,832			—
Non-cash dividends — unaffiliated		—			—				12,789,831			—
Foreign withholding tax claims		—			—				175,914			—
Foreign taxes withheld		—			—				(19,386,024	)		—
Net investment income allocated from the Master Small Cap Index Series:
Dividends — unaffiliated		—			—				—			32,558,529
Dividends — affiliated		—			—				—			276,278
Interest - unaffliated		—			—				—			1,029
Securities lending income — affiliated — net		—			—				—			1,428,875
Foreign taxes withheld		—			—				—			(83,732	)
Expenses		—			—				—			(495,959	)
Fees waived		—			—				—			20,268
Total investment income		8,965,428			3,759,493				203,046,855			33,705,288
EXPENSES
Service — class specific		822,955			3,781				1,326,940			1,575,230
Investment advisory		338,168			8,031				768,593			—
Transfer agent — class specific		193,774			14,999				—			846,946
Professional		106,100			92,023				129,480			82,220
Registration		76,618			55,059				—			111,605
Printing and postage		19,493			27,946				—			22,702
Recoupment of past waived and/or reimbursed fees — class specific		9,579			886				—			—
Accounting services		9,015			9,028				—			4,985
Directors and Officer		8,541			7,986				44,744			1,064
Custodian		4,215			968				—			—
Administration		—			—				—			1,304,729
Administration — class specific		—			—				3,111,055			—
Miscellaneous		68,752			14,609				550			17,838
Total expenses		1,657,210			235,316				5,381,362			3,967,319
Less:
Fees waived and/or reimbursed by the Administrator		—			—				—			(4,369	)
Fees waived and/or reimbursed by the Manager		(3,101	)		(167,192	)			(185,210	)		—
Transfer agent fees waived and/or reimbursed — class specific		(10,277	)		(14,145	)			—			(150,615	)
Total expenses after fees waived and/or reimbursed		1,643,832			53,979				5,196,152			3,812,335
Net investment income		7,321,596			3,705,514				197,850,703			29,892,953
REALIZED AND UNREALIZED GAIN (LOSS)
Net realized gain (loss) from:
Investments — unaffiliated		494,696			6,506				(13,462,822	)		—
Investments — affiliated		1,274			—				10,791			—
Foreign currency transactions		—			—				(7,940,018	)		—
Futures contracts		—			—				7,940,992			—
Net realized gain allocated from the Master Small Cap Index Series from:
Investments — unaffiliated		—			—				—			222,897,134
Investments — affiliated		—			—				—			1,346,903
Futures contracts		—			—				—			1,556,543
Swaps		—			—				—			658,945
		495,970			6,506				(13,451,057	)		226,459,525

38 2 0 2 1   BLACK ROCK  ANNUAL  REPORT  TO  SHAREHOLDERS

Statements of Operations   (continued)

Year Ended December 31, 2021

	iShares Municipal Bond Index Fund				iShares Short-Term TIPS Bond Index Fund		iShares MSCI EAFE International Index Fund				iShares Russell 2000 Small-Cap Index Fund
Net change in unrealized appreciation (depreciation) on:
Investments — unaffiliated		$	(3,400,627	)	$	266,540		$	598,983,734		$	—
Investments — affiliated			(1,597	)		—			(15,150	)		—
Foreign currency translations			—			—			(1,968,203	)		—
Futures contracts			—			—			266,476			—
Net change in unrealized appreciation (depreciation) allocated from Master Small Cap Index Series on:
Investments — unaffiliated			—			—			—			150,153,329
Investments — affiliated			—			—			—			39,830
Futures contracts			—			—			—			(6,906	)
Swaps			—			—			—			(979	)
			(3,402,224	)		266,540			597,266,857			150,185,274
Net realized and unrealized gain (loss)			(2,906,254	)		273,046			583,815,800			376,644,799
NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS		$	4,415,342		$	3,978,560		$	781,666,503		$	406,537,752

See notes to financial statements.

FUND   FINANCIAL  STATEMENTS 39

Statements of Changes in Net Assets

	iShares Municipal Bond Index Fund						iShares Short-Term TIPS Bond Index Fund
	Year Ended December 31,						Year Ended December 31,
	2021			2020			2021			2020
INCREASE (DECREASE) IN NET ASSETS
OPERATIONS
Net investment income	$	7,321,596		$	7,731,382		$	3,705,514		$	489,933
Net realized gain (loss)		495,970			767,093			6,506			(17,788	)
Net change in unrealized appreciation (depreciation)		(3,402,224	)		7,265,897			266,540			1,249,446
Net increase in net assets resulting from operations		4,415,342			15,764,372			3,978,560			1,721,591
DISTRIBUTIONS TO SHAREHOLDERS(a)
Institutional		(232,970	)		(79,249	)		(734,030	)		(161,714	)
Investor A		(552,520	)		(555,959	)		(58,170	)		(7,803	)
Investor P		(7,117,939	)		(7,699,970	)		—			—
Class K		(2,799	)		(2,823	)		(2,932,006	)		(322,417	)
Decrease in net assets resulting from distributions to shareholders		(7,906,228	)		(8,338,001	)		(3,724,206	)		(491,934	)
CAPITAL SHARE TRANSACTIONS
Net increase (decrease) in net assets derived from capital share transactions		(14,587,213	)		(19,069,783	)		44,904,403			40,760,633
NET ASSETS
Total increase (decrease) in net assets		(18,078,099	)		(11,643,412	)		45,158,757			41,990,290
Beginning of year		346,308,678			357,952,090			59,559,889			17,569,599
End of year	$	328,230,579		$	346,308,678		$	104,718,646		$	59,559,889

^(a) Distributions for annual periods determined in accordance with U.S. federal income tax regulations.

See notes to financial statements.

40 2 0 2 1   B LACK ROCK  ANNUAL  REPORT  TO  SHAREHOLDERS

Statements of Changes in Net Assets (continued)

	iShares MSCI EAFE International Index Fund							iShares Russell 2000 Small-Cap Index Fund
	Year Ended December 31,							Year Ended December 31,
		2021			2020				2021			2020
INCREASE (DECREASE) IN NET ASSETS
OPERATIONS
Net investment income		$	197,850,703		$	145,663,273			$	29,892,953		$	25,488,135
Net realized gain (loss)			(13,451,057	)		(319,994,595	)			226,459,525			(3,821,572	)
Net change in unrealized appreciation (depreciation)			597,266,857			250,780,805				150,185,274			449,403,875
Net increase in net assets resulting from operations			781,666,503			76,449,483				406,537,752			471,070,438
DISTRIBUTIONS TO SHAREHOLDERS(a)
Institutional			(31,413,447	)		(18,981,824	)			(34,044,604	)		(4,630,689	)
Investor A			(10,423,294	)		(6,032,650	)			(16,774,863	)		(3,073,130	)
Investor P			(4,183,302	)		(2,476,048	)			(24,685,571	)		(3,977,992	)
Class K			(203,630,682	)		(100,271,486	)			(162,398,277	)		(26,461,320	)
Decrease in net assets resulting from distributions to shareholders			(249,650,725	)		(127,762,008	)			(237,903,315	)		(38,143,131	)
CAPITAL SHARE TRANSACTIONS
Net increase (decrease) in net assets derived from capital share transactions			1,348,384,504			(1,539,505,451	)			443,268,536			17,181,682
NET ASSETS
Total increase (decrease) in net assets			1,880,400,282			(1,590,817,976	)			611,902,973			450,108,989
Beginning of year			6,647,017,012			8,237,834,988				2,754,295,778			2,304,186,789
End of year		$	8,527,417,294		$	6,647,017,012			$	3,366,198,751		$	2,754,295,778

^(a) Distributions for annual periods determined in accordance with U.S. federal income tax regulations.

See notes to financial statements.

FUND   FINANCIAL  STATEMENTS 41

Financial Highlights  

(For a share outstanding throughout each period)

	iShares Municipal Bond Index Fund
	Institutional
										Period from
		Year Ended December 31,										11/19/18	(a)
	2021			2020			2019			to 12/31/18
Net asset value, beginning of period	$	12.29		$	12.02		$	11.59			$	11.48
Net investment income(b)		0.29			0.30			0.30				0.04
Net realized and unrealized gain (loss)		(0.11	)		0.29			0.56				0.14
Net increase from investment operations		0.18			0.59			0.86				0.18
Distributions(c)
From net investment income		(0.29	)		(0.30	)		(0.30	)			(0.04	)
From net realized gain		(0.02	)		(0.02	)		(0.13	)			(0.03	)
Total distributions		(0.31	)		(0.32	)		(0.43	)			(0.07	)
Net asset value, end of period	$	12.16		$	12.29		$	12.02			$	11.59
Total Return(d)
Based on net asset value		1.54	%		4.97	%		7.52	%			1.56	%(e)
Ratios to Average Net Assets(f)
Total expenses		0.25	%		0.23	%		0.30	%(g)			0.32	%(h)(i)(j)
Total expenses after fees waived and/or reimbursed		0.24	%		0.22	%		0.23	%(g)			0.17	%(h)(i)(j)
Net investment income		2.40	%		2.46	%		2.49	%			2.74	%(h)
Supplemental Data
Net assets, end of period (000)	$	11,794		$	6,115		$	477			$	101
Portfolio turnover rate		7	%		8	%		24	%			3	%

^(a) Commencement of operations.

^(b) Based on average shares outstanding.

^(c) Distributions for annual periods determined in accordance with U.S. federal income tax regulations.

^(d) Where applicable, assumes the reinvestment of distributions.

^(e) Aggregate total return.

^(f) Excludes fees and expenses incurred indirectly as a result of investments in underlying funds.

^(g) Includes non-recurring expenses of offering costs. Without these costs, total expenses and total expenses after fees waived and/or reimbursed and paid indirectly would have been 0.24% and 0.23%, respectively.

^(h) Annualized.

⁽ⁱ⁾ Reorganization and offering costs were not annualized in the calculation of the expense ratios. If these expenses were annualized, the total expenses and total expenses after fees waived and/or reimbursed and paid indirectly would have been 0.69% and 0.21%, respectively.

^(j) Includes reorganization and offering costs associated with the Fund’s reorganization. Without these costs, total expenses and total expenses after fees waived and/or reimbursed and paid indirectly would have been 0.26% and 0.16%, respectively.

See notes to financial statements.

42 2 0 2 1   BLACK ROCK  ANNUAL  REPORT  TO  SHAREHOLDERS

Financial Highlights (continued)

(For a share outstanding throughout each period)

	iShares Municipal Bond Index Fund (continued)
	Investor A
	Year Ended December 31,
		2021			2020			2019			2018	(a)		2017
Net asset value, beginning of year	$	12.29		$	12.02		$	11.59		$	11.81		$	11.68
Net investment income(b)		0.26			0.27			0.27			0.39			0.31
Net realized and unrealized gain (loss)		(0.11	)		0.29			0.56			(0.25	)		0.13
Net increase from investment operations		0.15			0.56			0.83			0.14			0.44
Distributions(c)
From net investment income		(0.26	)		(0.27	)		(0.27	)		(0.31	)		(0.31	)
From net realized gain		(0.02	)		(0.02	)		(0.13	)		(0.05	)		—
Total distributions		(0.28	)		(0.29	)		(0.40	)		(0.36	)		(0.31	)
Net asset value, end of year	$	12.16		$	12.29		$	12.02		$	11.59		$	11.81
Total Return(d)
Based on net asset value		1.28	%		4.70	%		7.24	%		1.24	%		3.83	%
Ratios to Average Net Assets(e)
Total expenses		0.53	%		0.50	%		0.62	%(f)		0.77	%(g)		0.56	%
Total expenses after fees waived and/or reimbursed		0.50	%		0.48	%		0.50	%(f)		0.41	%(g)		0.37	%
Net investment income		2.15	%		2.22	%		2.25	%		3.36	%		2.61	%
Supplemental Data
Net assets, end of year (000)	$	23,348		$	23,315		$	23,805		$	25,418		$	396,544
Portfolio turnover rate		7	%		8	%		24	%		3	%		1	%

(a) On November 19, 2018, State Farm Tax Advantaged Bond Fund was reorganized into the Fund. The activity in the table above is for the accounting survivor, State Farm Tax Advantaged Bond Fund Premier Class, for the periods prior to the date of the reorganization, and for the post-reorganization combined fund thereafter.

^(b) Based on average shares outstanding.

^(c) Distributions for annual periods determined in accordance with U.S. federal income tax regulations.

^(d) Where applicable, assumes the reinvestment of distributions.

^(e) Excludes fees and expenses incurred indirectly as a result of investments in underlying funds.

^(f) Includes non-recurring expenses of offering costs. Without these costs, total expenses and total expenses after fees waived and/or reimbursed and paid indirectly would have been 0.56% and 0.50%, respectively.

^(g) Includes reorganization and offering costs associated with the Fund’s reorganization. Without these costs, total expenses and total expenses after fees waived and/or reimbursed and paid indirectly would have been 0.70% and 0.41%, respectively.

See notes to financial statements.

FUND   FINANCIAL  HIGHLIGHTS 43

Financial Highlights (continued)

(For a share outstanding throughout each period)

	iShares Municipal Bond Index Fund (continued)
	Investor P
	Year Ended December 31,
		2021			2020			2019			2018	(a)		2017
Net asset value, beginning of year	$	12.29		$	12.02		$	11.59		$	11.81		$	11.68
Net investment income(b)		0.26			0.27			0.27			0.39			0.31
Net realized and unrealized gain (loss)		(0.11	)		0.29			0.56			(0.25	)		0.13
Net increase from investment operations		0.15			0.56			0.83			0.14			0.44
Distributions(c)
From net investment income		(0.26	)		(0.27	)		(0.27	)		(0.31	)		(0.31	)
From net realized gain		(0.02	)		(0.02	)		(0.13	)		(0.05	)		—
Total distributions		(0.28	)		(0.29	)		(0.40	)		(0.36	)		(0.31	)
Net asset value, end of year	$	12.16		$	12.29		$	12.02		$	11.59		$	11.81
Total Return(d)
Based on net asset value		1.29	%		4.69	%		7.25	%		1.24	%		3.83	%
Ratios to Average Net Assets(e)
Total expenses		0.49	%		0.50	%		0.53	%(f)		0.77	%(g)		0.56	%
Total expenses after fees waived and/or reimbursed		0.49	%		0.49	%		0.50	%(f)		0.41	%(g)		0.37	%
Net investment income		2.16	%		2.21	%		2.26	%		3.35	%		2.61	%
Supplemental Data
Net assets, end of year (000)	$	292,983		$	316,772		$	333,565		$	352,137		$	396,544
Portfolio turnover rate		7	%		8	%		24	%		3	%		1	%

^(a) On November 19, 2018, State Farm Tax Advantaged Bond Fund was reorganized into the Fund. The activity in the table above is for the accounting survivor, State Farm Tax Advantaged Bond Fund Premier Class, for the periods prior to the date of the reorganization, and for the post-reorganization combined fund thereafter.

^(b) Based on average shares outstanding.

^(c) Distributions for annual periods determined in accordance with U.S. federal income tax regulations.

^(d) Where applicable, excludes the effects of any sales charges and assumes the reinvestment of distributions.

^(e) Excludes fees and expenses incurred indirectly as a result of investments in underlying funds.

^(f) Includes non-recurring expenses of offering costs. Without these costs, total expenses and total expenses after fees waived and/or reimbursed and paid indirectly would have been 0.47% and 0.50%, respectively.

^(g) Includes reorganization and offering costs associated with the Fund’s reorganization. Without these costs, total expenses and total expenses after fees waived and/or reimbursed and paid indirectly would have been 0.70% and 0.41%, respectively.

See notes to financial statements.

44 2 0 2 1   BLACK ROCK  ANNUAL  REPORT  TO  SHAREHOLDERS

Financial Highlights (continued)

(For a share outstanding throughout each period)

	iShares Municipal Bond Index Fund (continued)
	Class K
										Period from
		Year Ended December 31,										11/19/18	(a)
	2021			2020			2019			to 12/31/18
Net asset value, beginning of period	$	12.29		$	12.02		$	11.59			$	11.48
Net investment income(b)		0.30			0.30			0.30				0.04
Net realized and unrealized gain (loss)		(0.11	)		0.29			0.56				0.14
Net increase from investment operations		0.19			0.59			0.86				0.18
Distributions(c)
From net investment income		(0.30	)		(0.30	)		(0.30	)			(0.04	)
From net realized gain		(0.02	)		(0.02	)		(0.13	)			(0.03	)
Total distributions		(0.32	)		(0.32	)		(0.43	)			(0.07	)
Net asset value, end of period	$	12.16		$	12.29		$	12.02			$	11.59
Total Return(d)
Based on net asset value		1.58	%		5.00	%		7.57	%			1.57	%(e)
Ratios to Average Net Assets(f)
Total expenses		0.25	%		0.24	%		0.27	%(g)			0.33	%(h)(i)(j)
Total expenses after fees waived and/or reimbursed		0.20	%		0.20	%		0.20	%(g)			0.16	%(h)(i)(j)
Net investment income		2.45	%		2.50	%		2.55	%			2.74	%(h)
Supplemental Data
Net assets, end of period (000)	$	106		$	107		$	105			$	101
Portfolio turnover rate		7	%		8	%		24	%			3	%

^(a) Commencement of operations.

^(b) Based on average shares outstanding.

^(c) Distributions for annual periods determined in accordance with U.S. federal income tax regulations.

^(d) Where applicable, assumes the reinvestment of distributions.

^(e) Aggregate total return.

^(f) Excludes fees and expenses incurred indirectly as a result of investments in underlying funds.

^(g) Includes non-recurring expenses of offering costs. Without these costs, total expenses and total expenses after fees waived and/or reimbursed and paid indirectly would have been 0.21% and 0.20%, respectively.

^(h) Annualized.

⁽ⁱ⁾ Reorganization and offering costs were not annualized in the calculation of the expense ratios. If these expenses were annualized, the total expenses and total expenses after fees waived and/or reimbursed and paid indirectly would have been 0.70% and 0.20%, respectively.

^(j) Includes reorganization and offering costs associated with the Fund’s reorganization. Without these costs, total expenses and total expenses after fees waived and/or reimbursed and paid indirectly would have been 0.27% and 0.15%, respectively.

See notes to financial statements.

FUND   FINANCIAL  HIGHLIGHTS 45

Financial Highlights (continued)

(For a share outstanding throughout each period)

	iShares Short-Term TIPS Bond Index Fund
	Institutional
	Year Ended December 31,
		2021			2020			2019			2018			2017
Net asset value, beginning of year	$	10.30		$	9.98		$	9.74		$	9.95		$	10.05
Net investment income(a)		0.46			0.25			0.15			0.22			0.16
Net realized and unrealized gain (loss)		0.07			0.23			0.30			(0.16	)		(0.08	)
Net increase from investment operations		0.53			0.48			0.45			0.06			0.08
Distributions(b)
From net investment income		(0.46	)		(0.16	)		(0.21	)		(0.26	)		(0.18	)
From net realized gain		—			(0.00	)(c)		—			(0.01	)		—
Return of capital		—			—			—			—			(0.00	)(c)
Total distributions		(0.46	)		(0.16	)		(0.21	)		(0.27	)		(0.18	)
Net asset value, end of year	$	10.37		$	10.30		$	9.98		$	9.74		$	9.95
Total Return(d)
Based on net asset value		5.18	%		4.89	%		4.66	%		0.56	%		0.88	%
Ratios to Average Net Assets(e)
Total expenses		0.29	%		0.55	%		3.24	%		4.96	%		5.07	%
Total expenses after fees waived and/or reimbursed		0.07	%		0.07	%		0.11	%		0.09	%		0.08	%
Net investment income		4.41	%		2.51	%		1.47	%		2.19	%		1.64	%
Supplemental Data
Net assets, end of year (000)	$	18,004		$	16,549		$	721		$	976		$	3,348
Portfolio turnover rate		10	%		22	%		45	%		80	%		200	%

^(a) Based on average shares outstanding.

^(b) Distributions for annual periods determined in accordance with U.S. federal income tax regulations.

^(c) Amount is greater than $(0.005) per share.

^(d) Where applicable, assumes the reinvestment of distributions.

^(e) Excludes fees and expenses incurred indirectly as a result of investments in underlying funds.

See notes to financial statements.

46 2 0 2 1   BLACK ROCK  ANNUAL  REPORT  TO  SHAREHOLDERS

Financial Highlights (continued)

(For a share outstanding throughout each period)

	iShares Short-Term TIPS Bond Index Fund (continued)
	Investor A
	Year Ended December 31,
	2021			2020			2019			2018			2017
Net asset value, beginning of year	$	10.34		$	9.97		$	9.74		$	9.95		$	10.04
Net investment income(a)		0.40			0.07			0.19			0.20			0.14
Net realized and unrealized gain (loss)		0.10			0.39			0.23			(0.18	)		(0.07	)
Net increase from investment operations		0.50			0.46			0.42			0.02			0.07
Distributions(b)
From net investment income		(0.43	)		(0.09	)		(0.19	)		(0.22	)		(0.16	)
From net realized gain		—			(0.00	)(c)		—			(0.01	)		—
Return of capital		—			—			—			—			(0.00	)(c)
Total distributions		(0.43	)		(0.09	)		(0.19	)		(0.23	)		(0.16	)
Net asset value, end of year	$	10.41		$	10.34		$	9.97		$	9.74		$	9.95
Total Return(d)
Based on net asset value		4.89	%		4.64	%		4.39	%		0.22	%		0.76	%
Ratios to Average Net Assets(e)
Total expenses		0.71	%		1.18	%		3.36	%		6.40	%		6.24	%
Total expenses after fees waived and/or reimbursed		0.36	%		0.36	%		0.36	%		0.36	%		0.36	%
Net investment income		3.79	%		0.71	%		1.94	%		2.00	%		1.35	%
Supplemental Data
Net assets, end of year (000)	$	1,908		$	1,475		$	737		$	526		$	256
Portfolio turnover rate		10	%		22	%		45	%		80	%		200	%

^(a) Based on average shares outstanding.

^(b) Distributions for annual periods determined in accordance with U.S. federal income tax regulations.

^(c) Amount is greater than $(0.005) per share.

^(d) Where applicable, assumes the reinvestment of distributions.

^(e) Excludes fees and expenses incurred indirectly as a result of investments in underlying funds.

See notes to financial statements.

FUND   FINANCIAL  HIGHLIGHTS 47

Financial Highlights (continued)

(For a share outstanding throughout each period)

	iShares Short-Term TIPS Bond Index Fund (continued)
	Class K
	Year Ended December 31,
	2021			2020			2019			2018			2017
Net asset value, beginning of year	$	10.34		$	9.98		$	9.76		$	9.95		$	10.05
Net investment income(a)		0.49			0.12			0.25			0.31			0.25
Net realized and unrealized gain (loss)		0.04			0.36			0.21			(0.25	)		(0.16	)
Net increase from investment operations		0.53			0.48			0.46			0.06			0.09
Distributions(b)
From net investment income		(0.46	)		(0.12	)		(0.24	)		(0.24	)		(0.19	)
From net realized gain		—			(0.00	)(c)		—			(0.01	)		—
Return of capital		—			—			—			—			(0.00	)(c)
Total distributions		(0.46	)		(0.12	)		(0.24	)		(0.25	)		(0.19	)
Net asset value, end of year	$	10.41		$	10.34		$	9.98		$	9.76		$	9.95
Total Return(d)
Based on net asset value		5.19	%		4.87	%		4.72	%		0.60	%		0.89	%
Ratios to Average Net Assets(e)
Total expenses		0.28	%		0.71	%		2.14	%		5.80	%		2.82	%
Total expenses after fees waived and/or reimbursed		0.06	%		0.06	%		0.06	%		0.06	%		0.06	%
Net investment income		4.69	%		1.17	%		2.55	%		3.13	%		2.45	%
Supplemental Data
Net assets, end of year (000)	$	84,806		$	41,536		$	16,112		$	1,788		$	1,138
Portfolio turnover rate		10	%		22	%		45	%		80	%		200	%

^(a) Based on average shares outstanding.

^(b) Distributions for annual periods determined in accordance with U.S. federal income tax regulations.

^(c) Amount is greater than $(0.005) per share.

^(d) Where applicable, assumes the reinvestment of distributions.

^(e) Excludes fees and expenses incurred indirectly as a result of investments in underlying funds.

See notes to financial statements.

48 2 0 2 1   BLACK ROCK  ANNUAL  REPORT  TO  SHAREHOLDERS

Financial Highlights (continued)

(For a share outstanding throughout each period)

	iShares MSCI EAFE International Index Fund
	Institutional
	Year Ended December 31,
	2021			2020			2019			2018			2017
Net asset value, beginning of year	$	14.68		$	13.86		$	11.76		$	14.18		$	11.60
Net investment income(a)		0.41			0.30			0.42			0.42			0.39
Net realized and unrealized gain (loss)(b)		1.24			0.81			2.14			(2.31	)		2.53
Net increase (decrease) from investment operations		1.65			1.11			2.56			(1.89	)		2.92
Distributions(c)
From net investment income		(0.48	)		(0.29	)		(0.46	)		(0.53	)		(0.34	)
Return of capital		—			—			—			(0.00	)(d)		—
Total distributions		(0.48	)		(0.29	)		(0.46	)		(0.53	)		(0.34	)
Net asset value, end of year	$	15.85		$	14.68		$	13.86		$	11.76		$	14.18
Total Return(e)
Based on net asset value		11.28	%		8.03	%		21.80	%		(13.37	)%		25.24	%
Ratios to Average Net Assets(f)
Total expenses		0.09	%		0.09	%		0.08	%		0.11	%(g)		0.09	%
Total expenses after fees waived and/or reimbursed		0.09	%		0.09	%		0.08	%		0.10	%(g)		0.09	%
Net investment income		2.57	%		2.35	%		3.23	%		3.02	%		2.92	%
Supplemental Data
Net assets, end of year (000)	$	1,058,978		$	1,004,855		$	876,551		$	753,659		$	705,986
Portfolio turnover rate		3	%		8	%		4	%		43	%		23	%

^(a) Based on average shares outstanding.

^(b) The amounts reported for a share outstanding may not accord with the change in aggregate gains and losses in securities for the fiscal period due to the timing of capital share transactions in relation to the fluctuating market values of the Fund’s underlying securities.

^(c) Distributions for annual periods determined in accordance with U.S. federal income tax regulations.

^(d) Amount is greater than $(0.005) per share.

^(e) Where applicable, assumes the reinvestment of distributions.

^(f) Excludes fees and expenses incurred indirectly as a result of investments in underlying funds.

^(g) Includes reorganization costs, offering and board reorganization and consolidation expenses associated with the Fund’s reorganization. Without these expenses, total expenses and total expenses after fees waived and/or reimbursed would have been 0.10% and 0.09% respectively.

See notes to financial statements.

FUND   FINANCIAL  HIGHLIGHTS 49

Financial Highlights (continued)

(For a share outstanding throughout each period)

	iShares MSCI EAFE International Index Fund (continued)
	Investor A
	Year Ended December 31,
	2021			2020			2019			2018			2017
Net asset value, beginning of year	$	14.58		$	13.78		$	11.69		$	14.09		$	11.54
Net investment income(a)		0.36			0.27			0.39			0.38			0.34
Net realized and unrealized gain (loss)(b)		1.24			0.78			2.12			(2.28	)		2.52
Net increase (decrease) from investment operations		1.60			1.05			2.51			(1.90	)		2.86
Distributions(c)
From net investment income		(0.44	)		(0.25	)		(0.42	)		(0.50	)		(0.31	)
Return of capital		—			—			—			(0.00	)(d)		—
Total distributions		(0.44	)		(0.25	)		(0.42	)		(0.50	)		(0.31	)
Net asset value, end of year	$	15.74		$	14.58		$	13.78		$	11.69		$	14.09
Total Return(e)
Based on net asset value		11.01	%		7.68	%		21.53	%		(13.57	)%		24.84	%
Ratios to Average Net Assets(f)
Total expenses		0.34	%		0.35	%		0.35	%		0.36	%(g)		0.36	%
Total expenses after fees waived and/or reimbursed		0.34	%		0.35	%		0.35	%		0.36	%(g)		0.35	%
Net investment income		2.31	%		2.11	%		3.00	%		2.74	%		2.60	%
Supplemental Data
Net assets, end of year (000)	$	385,287		$	351,999		$	340,750		$	305,043		$	373,846
Portfolio turnover rate		3	%		8	%		4	%		43	%		23	%

^(a) Based on average shares outstanding.

^(b) The amounts reported for a share outstanding may not accord with the change in aggregate gains and losses in securities for the fiscal period due to the timing of capital share transactions in relation to the fluctuating market values of the Fund’s underlying securities.

^(c) Distributions for annual periods determined in accordance with U.S. federal income tax regulations.

^(d) Amount is greater than $(0.005) per share.

^(e) Where applicable, assumes the reinvestment of distributions.

^(f) Excludes fees and expenses incurred indirectly as a result of investments in underlying funds.

^(g) Includes reorganization costs, offering and board reorganization and consolidation expenses associated with the Fund’s reorganization. Without these expenses, total expenses and total expenses after fees waived and/or reimbursed would have been 0.36% and 0.35% respectively.

See notes to financial statements.

50 2 0 2 1   BLACK ROCK  ANNUAL  REPORT  TO  SHAREHOLDERS

Financial Highlights  (continued)

(For a share outstanding throughout each period)

	iShares MSCI EAFE International Index Fund (continued)
	Investor P
										Period from
		Year Ended December 31,										08/06/18	(a)
	2021			2020			2019				to 12/31/18
Net asset value, beginning of period	$	14.53		$	13.73		$	11.65			$	13.87
Net investment income(b)		0.36			0.26			0.39				0.01
Net realized and unrealized gain (loss)(c)		1.24			0.79			2.11				(1.70	)
Net increase (decrease) from investment operations		1.60			1.05			2.50				(1.69	)
Distributions(d)
From net investment income		(0.44	)		(0.25	)		(0.42	)			(0.53	)
Return of capital		—			—			—				(0.00	)(e)
Total distributions		(0.44	)		(0.25	)		(0.42	)			(0.53	)
Net asset value, end of period	$	15.69		$	14.53		$	13.73			$	11.65
Total Return(f)
Based on net asset value		11.05	%		7.68	%		21.51	%			(12.25	)%(g)
Ratios to Average Net Assets(h)
Total expenses		0.34	%		0.37	%		0.39	%			0.33	%(i)(j)
Total expenses after fees waived and/or reimbursed		0.34	%		0.37	%		0.36	%			0.32	%(i)(j)
Net investment income		2.30	%		2.08	%		2.97	%			0.23	%(i)
Supplemental Data
Net assets, end of period (000)	$	153,682		$	146,759		$	149,612			$	137,266
Portfolio turnover rate		3	%		8	%		4	%			43	%

^(a) Commencement of operations.

^(b) Based on average shares outstanding.

^(c) The amounts reported for a share outstanding may not accord with the change in aggregate gains and losses in securities for the fiscal period due to the timing of capital share transactions in relation to the fluctuating market values of the Fund’s underlying securities.

^(d) Distributions for annual periods determined in accordance with U.S. federal income tax regulations.

^(e) Amount is greater than $(0.005) per share.

^(f) Where applicable, excludes the effects of any sales charges and assumes the reinvestment of distributions.

^(g) Aggregate total return.

^(h) Excludes fees and expenses incurred indirectly as a result of investments in underlying funds.

⁽ⁱ⁾ Annualized.

^(j) Reorganization costs, offering and board realignment and consolidation expenses were not annualized in the calculation of the expense ratios. If these expenses were annualized, the total expenses and total expenses after fees waived and/or reimbursed would have been 0.34% and 0.33% respectively.

See notes to financial statements.

FUND   FINANCIAL  HIGHLIGHTS 51

Financial Highlights  (continued)

(For a share outstanding throughout each period)

	iShares MSCI EAFE International Index Fund (continued)
	Class K
	Year Ended December 31,
	2021			2020			2019			2018			2017
Net asset value, beginning of year	$	14.69		$	13.87		$	11.76		$	14.18		$	11.61
Net investment income(a)		0.41			0.31			0.43			0.43			0.38
Net realized and unrealized gain (loss)(b)		1.24			0.80			2.14			(2.31	)		2.54
Net increase (decrease) from investment operations		1.65			1.11			2.57			(1.88	)		2.92
Distributions(c)
From net investment income		(0.48	)		(0.29	)		(0.46	)		(0.54	)		(0.35	)
Return of capital		—			—			—			(0.00	)(d)		—
Total distributions		(0.48	)		(0.29	)		(0.46	)		(0.54	)		(0.35	)
Net asset value, end of year	$	15.86		$	14.69		$	13.87		$	11.76		$	14.18
Total Return(e)
Based on net asset value		11.33	%		8.07	%		21.94	%		(13.33	)%		25.17	%
Ratios to Average Net Assets(f)
Total expenses		0.04	%		0.04	%		0.03	%		0.06	%(g)		0.06	%
Total expenses after fees waived and/or reimbursed		0.04	%		0.04	%		0.03	%		0.05	%(g)		0.06	%
Net investment income		2.60	%		2.39	%		3.28	%		3.12	%		2.80	%
Supplemental Data
Net assets, end of year (000)	$	6,929,470		$	5,143,404		$	6,870,922		$	6,420,732		$	9,509,257
Portfolio turnover rate		3	%		8	%		4	%		43	%		23	%

^(a) Based on average shares outstanding.

^(b) The amounts reported for a share outstanding may not accord with the change in aggregate gains and losses in securities for the fiscal period due to the timing of capital share transactions in relation to the fluctuating market values of the Fund’s underlying securities.

^(c) Distributions for annual periods determined in accordance with U.S. federal income tax regulations.

^(d) Amount is greater than $(0.005) per share.

^(e) Where applicable, assumes the reinvestment of distributions.

^(f) Excludes fees and expenses incurred indirectly as a result of investments in underlying funds.

^(g) Includes reorganization costs, offering and board reorganization and consolidation expenses associated with the Fund’s reorganization. Without these expenses, total expenses and total expenses after fees waived and/or reimbursed would have been 0.05% and 0.04% respectively.

See notes to financial statements.

52 2 0 2 1   BLACK ROCK  ANNUAL  REPORT  TO  SHAREHOLDERS

Financial Highlights (continued)

(For a share outstanding throughout each period)

	iShares Russell 2000 Small-Cap Index Fund
	Institutional
	Year Ended December 31,
	2021			2020			2019			2018			2017
Net asset value, beginning of year	$	24.19		$	20.46		$	16.87		$	19.72		$	17.76
Net investment income(a)		0.25			0.23			0.27			0.28			0.25
Net realized and unrealized gain (loss)		3.28			3.84			4.02			(2.40	)		2.34
Net increase (decrease) from investment operations		3.53			4.07			4.29			(2.12	)		2.59
Distributions(b)
From net investment income		(0.29	)		(0.25	)		(0.28	)		(0.20	)		(0.21	)
From net realized gain		(1.67	)		(0.09	)		(0.42	)		(0.53	)		(0.42	)
Total distributions		(1.96	)		(0.34	)		(0.70	)		(0.73	)		(0.63	)
Net asset value, end of year	$	25.76		$	24.19		$	20.46		$	16.87		$	19.72
Total Return(c)
Based on net asset value		14.73	%		19.97	%		25.50	%		(10.94	)%		14.55	%
Ratios to Average Net Assets(d)(e)(f)
Total expenses		0.12	%		0.16	%		0.16	%		0.18	%(g)		0.18	%
Total expenses after fees waived and/or reimbursed		0.12	%		0.12	%		0.12	%		0.12	%(g)		0.11	%
Net investment income		0.93	%		1.22	%		1.38	%		1.38	%		1.36	%
Supplemental Data
Net assets, end of year (000)	$	479,451		$	331,429		$	227,381		$	200,990		$	167,351
Portfolio turnover rate of the Series		31	%		27	%		20	%		28	%		30	%

^(a) Based on average Common Shares outstanding.

^(b) Distributions for annual periods determined in accordance with U.S. federal income tax regulations.

^(c) Where applicable, assumes the reinvestment of distributions.

^(d) Includes the Fund’s share of the Series’ allocated net expenses and/or net investment income.

^(e) Includes the Fund’s share of the Series’ allocated fees waived of less than 0.01%.

^(f) Excludes fees and expenses incurred indirectly as a result of investments in underlying funds.

^(g) Includes reorganization costs, offering and board reorganization and consolidation expenses associated with the Fund’s reorganization. Without these expenses, total expenses and total expenses after fees waived and/or reimbursed would have been 0.16% and 0.10% respectively.

See notes to financial statements.

FUND   FINANCIAL  HIGHLIGHTS 53

Financial Highlights (continued)

(For a share outstanding throughout each period)

	iShares Russell 2000 Small-Cap Index Fund (continued)
	Investor A
	Year Ended December 31,
		2021			2020			2019			2018			2017
Net asset value, beginning of year	$	24.22		$	20.49		$	16.89		$	19.74		$	17.78
Net investment income(a)		0.18			0.17			0.22			0.22			0.21
Net realized and unrealized gain (loss)		3.28			3.85			4.03			(2.40	)		2.34
Net increase (decrease) from investment operations		3.46			4.02			4.25			(2.18	)		2.55
Distributions(b)
From net investment income		(0.22	)		(0.20	)		(0.23	)		(0.14	)		(0.17	)
From net realized gain		(1.67	)		(0.09	)		(0.42	)		(0.53	)		(0.42	)
Total distributions		(1.89	)		(0.29	)		(0.65	)		(0.67	)		(0.59	)
Net asset value, end of year	$	25.79		$	24.22		$	20.49		$	16.89		$	19.74
Total Return(c)
Based on net asset value		14.38	%		19.66	%		25.20	%		(11.19	)%		14.35	%
Ratios to Average Net Assets(d)(e)(f)
Total expenses		0.40	%		0.41	%		0.42	%		0.43	%(g)		0.45	%
Total expenses after fees waived and/or reimbursed.		0.37	%		0.37	%		0.37	%		0.37	%(g)		0.37	%
Net investment income		0.66	%		0.93	%		1.14	%		1.08	%		1.13	%
Supplemental Data
Net assets, end of year (000)	$	243,110		$	257,905		$	273,413		$	254,591		$	249,980
Portfolio turnover rate of the Series		31	%		27	%		20	%		28	%		30	%

^(a) Based on average Common Shares outstanding.

^(b) Distributions for annual periods determined in accordance with U.S. federal income tax regulations.

^(c) Where applicable, assumes the reinvestment of distributions.

^(d) Includes the Fund’s share of the Series’ allocated net expenses and/or net investment income.

^(e) Includes the Fund’s share of the Series’ allocated fees waived of less than 0.01%.

^(f) Excludes fees and expenses incurred indirectly as a result of investments in underlying funds.

^(g) Includes reorganization costs, offering and board reorganization and consolidation expenses associated with the Fund’s reorganization. Without these expenses, total expenses and total expenses after fees waived and/or reimbursed would have been 0.41% and 0.35% respectively.

See notes to financial statements.

54 2 0 2 1   BLACK ROCK  ANNUAL  REPORT  TO  SHAREHOLDERS

Financial Highlights (continued)

(For a share outstanding throughout each period)

	iShares Russell 2000 Small-Cap Index Fund (continued)
	Investor P
										Period from
		Year Ended December 31,										08/06/18	(a)
	2021			2020			2019			to 12/31/18
Net asset value, beginning of period	$	24.14		$	20.43		$	16.84			$	21.76
Net investment income(b)		0.18			0.18			0.22				0.17
Net realized and unrealized gain (loss)		3.27			3.82			4.02				(4.38	)
Net increase (decrease) from investment operations		3.45			4.00			4.24				(4.21	)
Distributions(c)
From net investment income		(0.22	)		(0.20	)		(0.23	)			(0.19	)
From net realized gain		(1.67	)		(0.09	)		(0.42	)			(0.52	)
Total distributions		(1.89	)		(0.29	)		(0.65	)			(0.71	)
Net asset value, end of period	$	25.70		$	24.14		$	20.43			$	16.84
Total Return(d)
Based on net asset value		14.42	%		19.65	%		25.25	%			(19.49	)%(e)
Ratios to Average Net Assets(f)(g)(h)
Total expenses		0.38	%		0.41	%		0.40	%			0.39	%(i)(j)(k)
Total expenses after fees waived and/or reimbursed		0.37	%		0.37	%		0.36	%			0.35	%(i)(j)(k)
			��
Net investment income		0.67	%		0.95	%		1.14	%			2.12	%(i)
Supplemental Data
Net assets, end of period (000)	$	354,746		$	329,486		$	301,163			$	265,393
Portfolio turnover rate of the Series		31	%		27	%		20	%			28	%

^(a) Commencement of operations.

^(b) Based on average Common Shares outstanding.

^(c) Distributions for annual periods determined in accordance with U.S. federal income tax regulations.

^(d) Where applicable, excludes the effects of any sales charges and assumes the reinvestment of distributions.

^(e) Aggregate total return.

^(f) Includes the Fund’s share of the Series’ allocated net expenses and/or net investment income.

^(g) Includes the Fund’s share of the Series’ allocated fees waived of less than 0.01%.

^(h) Excludes fees and expenses incurred indirectly as a result of investments in underlying funds.

⁽ⁱ⁾ Annualized.

^(j) Includes reorganization costs, offering and board reorganization and consolidation expenses associated with the Fund’s reorganization. Without these expenses, total expenses and total expenses after fees waived and/or reimbursed would have been 0.38% and 0.35% respectively.

^(k) Reorganization costs, offering and board realignment and consolidation expenses were not annualized in the calculation of the expense ratios. If these expenses were annualized, the total expenses and total expenses after fees waived and/or reimbursed would have been 0.40% and 0.37% respectively.

See notes to financial statements.

FUND   FINANCIAL  HIGHLIGHTS 55

Financial Highlights (continued)

(For a share outstanding throughout each period)

	iShares Russell 2000 Small-Cap Index Fund (continued)
	Class K
	Year Ended December 31,
		2021			2020			2019			2018			2017
Net asset value, beginning of year	$	24.26		$	20.52		$	16.91		$	19.77		$	17.79
Net investment income(a)		0.27			0.24			0.28			0.30			0.27
Net realized and unrealized gain (loss)		3.29			3.85			4.04			(2.43	)		2.34
Net increase (decrease) from investment operations		3.56			4.09			4.32			(2.13	)		2.61
Distributions(b)
From net investment income		(0.31	)		(0.26	)		(0.29	)		(0.20	)		(0.21	)
From net realized gain		(1.67	)		(0.09	)		(0.42	)		(0.53	)		(0.42	)
Total distributions		(1.98	)		(0.35	)		(0.71	)		(0.73	)		(0.63	)
Net asset value, end of year	$	25.84		$	24.26		$	20.52		$	16.91		$	19.77
Total Return(c)
Based on net asset value		14.78	%		20.00	%		25.62	%		(10.93	)%		14.69	%
Ratios to Average Net Assets(d)(e)(f)
Total expenses		0.07	%		0.08	%		0.08	%		0.11	%(g)		0.14	%
Total expenses after fees waived and/or reimbursed		0.07	%		0.07	%		0.07	%		0.07	%(g)		0.07	%
Net investment income		0.99	%		1.26	%		1.44	%		1.44	%		1.40	%
Supplemental Data
Net assets, end of year (000)	$	2,288,892		$	1,835,475		$	1,502,229		$	945,929		$	474,830
Portfolio turnover rate of the Series		31	%		27	%		20	%		28	%		30	%

^(a) Based on average Common Shares outstanding.

^(b) Distributions for annual periods determined in accordance with U.S. federal income tax regulations.

^(c) Where applicable, assumes the reinvestment of distributions.

^(d) Includes the Fund’s share of the Series’ allocated net expenses and/or net investment income.

^(e) Includes the Fund’s share of the Series’ allocated fees waived of less than 0.01%.

^(f) Excludes fees and expenses incurred indirectly as a result of investments in underlying funds.

^(g) Includes reorganization costs, offering and board reorganization and consolidation expenses associated with the Fund’s reorganization. Without these expenses, total expenses and total expenses after fees waived and/or reimbursed would have been 0.10% and 0.05% respectively.

See notes to financial statements.

56 2 0 2 1   BLACK ROCK  ANNUAL  REPORT  TO  SHAREHOLDERS

Notes to Financial Statements

1. ORGANIZATION

BlackRock Funds^SM (the “Trust”) and BlackRock Index Funds, Inc. (the “Corporation”), are each registered under the Investment Company Act of 1940, as amended (the “1940 Act”), as open-end management investment companies. BlackRock Funds^SM is organized as a Massachusetts business trust. BlackRock Index Funds, Inc. is organized as a Maryland corporation. The following, each of which is a series of one of BlackRock Funds^SM or BlackRock Index Funds, Inc., are referred to herein collectively as the “Funds” or individually as a “Fund”:

Registrant Name	Fund Name	Herein Referred To As	Diversification Classification
BlackRock FundsSM	iShares Municipal Bond Index Fund	Municipal Bond Index	Diversified
	iShares Short-Term TIPS Bond Index Fund	Short-Term TIPS Bond Index	Diversified
BlackRock Index Funds, Inc.	iShares MSCI EAFE International Index Fund	International Index	Diversified
	iShares Russell 2000 Small-Cap Index Fund	Small Cap Index	Diversified

Small Cap Index seeks to achieve its investment objective by investing all of its assets in Master Small Cap Index Series (the “Series”), a series of Quantitative Master Series LLC (the “Master LLC”), and an affiliate of Small Cap Index, which has the same investment objective and strategies as Small Cap Index. The value of Small Cap Index’s investment in the Series reflects Small Cap Index’s proportionate interest in the net assets of the Series. The performance of Small Cap Index is directly affected by the performance of the Series. At December 31, 2021, the percentage of the Series owned by Small Cap Index was 73.7%. The financial statements of the Series, including the Schedule of Investments, are included elsewhere in this report and should be read in conjunction with Small Cap Index’s financial statements.

Each Fund offers multiple classes of shares. All classes of shares have identical voting, dividend, liquidation and other rights and are subject to the same terms and conditions, except that certain classes bear expenses related to the shareholder servicing and distribution of such shares. Institutional and Class K Shares are sold only to certain eligible investors. Investor A and Investor P Shares bear certain expenses related to shareholder servicing of such shares. Investor A Shares are generally available through financial intermediaries. Investor P Shares are only available through registered representatives of an insurance company’s broker-dealer that has entered into an agreement with the Fund’s distributor to offer such shares. Each class has exclusive voting rights with respect to matters relating to its shareholder servicing and distribution expenditures.

Share Class	Initial Sales Charge	CDSC			Conversion Privilege
Institutional, Investor A and Class K Shares	No		No		None
Investor P Shares	Yes		No	(a)	None

^(a) Investor P Shares may be subject to a contingent deferred sales charge (“CDSC”) for certain redemptions where no initial sales charge was paid at the time of purchase.

The Board of Trustees of the Trust and the Board of Directors of the Corporation are collectively referred to throughout this report as the “Board”, and the directors/trustees thereof are collectively referred to throughout this report as “Directors”.

The Funds, together with certain other registered investment companies advised by BlackRock Advisors, LLC (the “Manager”) or its affiliates, are included in a complex of open-end equity, multi-asset, index and money market funds referred to as the BlackRock Multi-Asset Complex.

2. SIGNIFICANT ACCOUNTING POLICIES

The financial statements are prepared in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”), which may require management to make estimates and assumptions that affect the reported amounts of assets and liabilities in the financial statements, disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of increases and decreases in net assets from operations during the reporting period. Actual results could differ from those estimates. Each Fund is considered an investment company under U.S. GAAP and follows the accounting and reporting guidance applicable to investment companies. Below is a summary of significant accounting policies:

Investment Transactions and Income Recognition: For Municipal Bond Index, Short-Term TIPS Bond Index and International Index, for financial reporting purposes, investment transactions are recorded on the dates the transactions are executed (the “trade dates”). Realized gains and losses on investment transactions are determined using the specific identification method. Dividend income and capital gain distributions, if any, are recorded on the ex-dividend dates. Non-cash dividends, if any, are recorded on the ex-dividend dates at fair value. Dividends from foreign securities where the ex-dividend dates may have passed are subsequently recorded when International Index is informed of the ex-dividend dates. Under the applicable foreign tax laws, a withholding tax at various rates may be imposed on capital gains, dividends and interest. Upon notification from issuers, a portion of the dividend income received from a real estate investment trust may be redesignated as a reduction of cost of the related investment and/or realized gain. Interest income, including amortization and accretion of premiums and discounts on debt securities. Income, expenses and realized and unrealized gains and losses are allocated daily to each class based on its relative net assets.

For Small Cap Index, for financial reporting purposes, contributions to and withdrawals from the Series are accounted for on a trade date basis. Small Cap Index records its proportionate share of the Series’ income, expenses and realized and unrealized gains and losses on a daily basis. Realized and unrealized gains and losses are adjusted utilizing partnership tax allocation rules. In addition, Small Cap Index accrues its own expenses. Income, expenses and realized and unrealized gains and losses are allocated daily to each class based on its relative net assets.

Foreign Currency Translation: Each Fund’s books and records are maintained in U.S. dollars. Securities and other assets and liabilities denominated in foreign currencies are translated into U.S. dollars using exchange rates determined as of the close of trading on the New York Stock Exchange (“NYSE”). Purchases and sales of investments are recorded at the rates of exchange prevailing on the respective dates of such transactions. Generally, when the U.S. dollar rises in value against a foreign currency, the investments denominated in that currency will lose value; the opposite effect occurs if the U.S. dollar falls in relative value.

FUND   NOTES  TO  FINANCIAL  STATEMENTS 57

Notes to Financial Statements  (continued)

Each Fund does not isolate the effect of fluctuations in foreign exchange rates from the effect of fluctuations in the market prices of investments for financial reporting purposes. Accordingly, the effects of changes in exchange rates on investments are not segregated in the Statements of Operations from the effects of changes in market prices of those investments, but are included as a component of net realized and unrealized gain (loss) from investments. Each Fund reports realized currency gains (losses) on foreign currency related transactions as components of net realized gain (loss) for financial reporting purposes, whereas such components are generally treated as ordinary income for U.S. federal income tax purposes.

Foreign Taxes: The International Index may be subject to foreign taxes (a portion of which may be reclaimable) on income, stock dividends, capital gains on investments, or certain foreign currency transactions. All foreign taxes are recorded in accordance with the applicable foreign tax regulations and rates that exist in the foreign jurisdictions in which the Fund invests. These foreign taxes, if any, are paid by the Fund and are reflected in its Statements of Operations as follows: foreign taxes withheld at source are presented as a reduction of income, foreign taxes on securities lending income are presented as a reduction of securities lending income, foreign taxes on stock dividends are presented as “Foreign taxes withheld”, and foreign taxes on capital gains from sales of investments and foreign taxes on foreign currency transactions are included in their respective net realized gain (loss) categories. Foreign taxes payable or deferred as of December 31, 2021, if any, are disclosed in the Statements of Assets and Liabilities.

The Funds file withholding tax reclaims in certain jurisdictions to recover a portion of amounts previously withheld. The Funds may record a reclaim receivable based on collectability, which includes factors such as the jurisdiction’s applicable laws, payment history and market convention. The Statements of Operations include tax reclaims recorded as well as professional and other fees, if any, associated with recovery of foreign withholding taxes.

Segregation and Collateralization: In cases where a Fund enters into certain investments (e.g., futures contracts) that would be treated as “senior securities” for 1940 Act purposes, a Fund may segregate or designate on its books and records cash or liquid assets having a market value at least equal to the amount of its future obligations under such investments. Doing so allows the investments to be excluded from treatment as a “senior security.” Furthermore, if required by an exchange or counterparty agreement, the Funds may be required to deliver/deposit cash and/or securities to/with an exchange, or broker-dealer or custodian as collateral for certain investments or obligations.

Distributions: Distributions paid by International Index and Small Cap Index are recorded on the ex-dividend dates. Distributions from net investment income for Municipal Bond Index and Short-Term TIPS Bond Index are declared daily and paid monthly. Distributions of capital gains are recorded on the ex-dividend dates and made at least annually. The character and timing of distributions are determined in accordance with U.S. federal income tax regulations, which may differ from U.S. GAAP.

Indemnifications: In the normal course of business, a Fund enters into contracts that contain a variety of representations that provide general indemnification. A Fund’s maximum exposure under these arrangements is unknown because it involves future potential claims against a Fund, which cannot be predicted with any certainty.

Other: Expenses directly related to a Fund or its classes are charged to that Fund or the applicable class. Expenses directly related to the Funds and other shared expenses prorated to the Funds are allocated daily to each class based on their relative net assets or other appropriate methods. Other operating expenses shared by several funds, including other funds managed by the Manager, are prorated among those funds on the basis of relative net assets or other appropriate methods.

3. INVESTMENT VALUATION AND FAIR VALUE MEASUREMENTS

Investment Valuation Policies: Each Fund’s investments are valued at fair value (also referred to as “market value” within the financial statements) each day that the Fund is open for business and, for financial reporting purposes, as of the report date. U.S. GAAP defines fair value as the price a fund would receive to sell an asset or pay to transfer a liability in an orderly transaction between market participants at the measurement date. Each Fund determines the fair values of its financial instruments using various independent dealers or pricing services under policies approved by the Board. If a security’s market price is not readily available or does not otherwise accurately represent the fair value of the security, the security will be valued in accordance with a policy approved by the Board as reflecting fair value. Small Cap Index’s policy is to value its financial instruments at fair value. The BlackRock Global Valuation Methodologies Committee (the “Global Valuation Committee”) is the committee formed by management to develop global pricing policies and procedures and to oversee the pricing function for all financial instruments. Small Cap Index records its investment in the Series at fair value based on the Small Cap Index’s proportionate interest in the net assets of the Series. Valuation of securities held by the Series is discussed in Note 3 of the Series’ Notes to Financial Statements, which are included elsewhere in this report.

Fair Value Inputs and Methodologies: The following methods and inputs are used to establish the fair value of each Fund’s assets and liabilities:

• Equity investments traded on a recognized securities exchange are valued at that day’s official closing price, as applicable, on the exchange where the stock is primarily traded. Equity investments traded on a recognized exchange for which there were no sales on that day may be valued at the last available bid (long positions) or ask (short positions) price.

• Fixed-income investments for which market quotations are readily available are generally valued using the last available bid price or current market quotations provided by independent dealers or third-party pricing services. Floating rate loan interests are valued at the mean of the bid prices from one or more independent brokers or dealers as obtained from a third-party pricing service. Pricing services generally value fixed-income securities assuming orderly transactions of an institutional round lot size, but a fund may hold or transact in such securities in smaller, odd lot sizes. Odd lots may trade at lower prices than institutional round lots. The pricing services may use matrix pricing or valuation models that utilize certain inputs and assumptions to derive values, including transaction data (e.g., recent representative bids and offers), market data, credit quality information, perceived market movements, news, and other relevant information. Certain fixed-income securities, including asset-backed and mortgage related securities may be valued based on valuation models that consider the estimated cash flows of each tranche of the entity, establish a benchmark yield and develop an estimated tranche specific spread to the benchmark yield based on the unique attributes of the tranche. The amortized cost method of valuation may be used with respect to debt obligations with sixty days or less remaining to maturity unless the Manager determines such method does not represent fair value.

• Investments in open-end U.S. mutual funds (including money market funds) are valued at that day’s published net asset value (“NAV”).

58 2 0 2 1   BLACK ROCK  ANNUAL  REPORT  TO  SHAREHOLDERS

Notes to Financial Statements  (continued)

• Futures contracts are valued based on that day’s last reported settlement or trade price on the exchange where the contract is traded.

Generally, trading in foreign instruments is substantially completed each day at various times prior to the close of trading on the NYSE. Each business day, the Funds use current market factors supplied by independent pricing services to value certain foreign instruments (“Systematic Fair Value Price”). The Systematic Fair Value Price is designed to value such foreign securities at fair value as of the close of trading on the NYSE, which follows the close of the local markets.

If events (e.g., market volatility, company announcement or a natural disaster) occur that are expected to materially affect the value of such investment, or in the event that application of these methods of valuation results in a price for an investment that is deemed not to be representative of the market value of such investment, or if a price is not available, the investment will be valued by the Global Valuation Committee, or its delegate, in accordance with a policy approved by the Board as reflecting fair value (“Fair Valued Investments”). The fair valuation approaches that may be used by the Global Valuation Committee include market approach, income approach and cost approach. Valuation techniques such as discounted cash flow, use of market comparables and matrix pricing are types of valuation approaches and are typically used in determining fair value. When determining the price for Fair Valued Investments, the Global Valuation Committee, or its delegate, seeks to determine the price that each Fund might reasonably expect to receive or pay from the current sale or purchase of that asset or liability in an arm’s-length transaction. Fair value determinations shall be based upon all available factors that the Global Valuation Committee, or its delegate, deems relevant and consistent with the principles of fair value measurement. The pricing of all Fair Valued Investments is subsequently reported to the Board or a committee thereof on a quarterly basis.

For investments in equity or debt issued by privately held companies or funds (“Private Company” or collectively, the “Private Companies”) and other Fair Valued Investments, the fair valuation approaches that are used by the Global Valuation Committee and third-party pricing services utilize one or a combination of, but not limited to, the following inputs.

	Standard Inputs Generally Considered By Third-Party Pricing Services
Market approach	(i)	recent market transactions, including subsequent rounds of financing, in the underlying investment or comparable issuers;
	(ii)	recapitalizations and other transactions across the capital structure; and
	(iii)	market multiples of comparable issuers.
Income approach	(i)	future cash flows discounted to present and adjusted as appropriate for liquidity, credit, and/or market risks;
	(ii)	quoted prices for similar investments or assets in active markets; and
	(iii)	other risk factors, such as interest rates, yield curves, volatilities, prepayment speeds, loss severities, credit risks, recovery rates, liquidation amounts and/or default rates.
Cost approach	(i)	audited or unaudited financial statements, investor communications and financial or operational metrics issued by the Private Company;
	(ii)	changes in the valuation of relevant indices or publicly traded companies comparable to the Private Company;
	(iii)	relevant news and other public sources; and
	(iv)	known secondary market transactions in the Private Company’s interests and merger or acquisition activity in companies comparable to the Private Company.

Investments in series of preferred stock issued by Private Companies are typically valued utilizing market approach in determining the enterprise value of the company. Such investments often contain rights and preferences that differ from other series of preferred and common stock of the same issuer. Enterprise valuation techniques such as an option pricing model (“OPM”), a probability weighted expected return model (“PWERM”), current value method or a hybrid of those techniques are used as deemed appropriate under the circumstances. The use of these valuation techniques involve a determination of the exit scenarios of the investment in order to appropriately allocate the enterprise value of the company among the various parts of its capital structure.

The Private Companies are not subject to the public company disclosure, timing, and reporting standards applicable to other investments held by a Fund. Typically, the most recently available information by a Private Company is as of a date that is earlier than the date a Fund is calculating its NAV. This factor may result in a difference between the value of the investment and the price a Fund could receive upon the sale of the investment.

Fair Value Hierarchy: Various inputs are used in determining the fair value of financial instruments. These inputs to valuation techniques are categorized into a fair value hierarchy consisting of three broad levels for financial reporting purposes as follows:

• Level 1 – Unadjusted price quotations in active markets/exchanges for identical assets or liabilities that each Fund has the ability to access;

• Level 2 – Other observable inputs (including, but not limited to, quoted prices for similar assets or liabilities in markets that are active, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the assets or liabilities (such as interest rates, yield curves, volatilities, prepayment speeds, loss severities, credit risks and default rates) or other market–corroborated inputs); and

• Level 3 – Unobservable inputs based on the best information available in the circumstances, to the extent observable inputs are not available (including the Global Valuation Committee’s assumptions used in determining the fair value of financial instruments).

The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). Accordingly, the degree of judgment exercised in determining fair value is greatest for instruments categorized in Level 3. The inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, for disclosure purposes, the fair value hierarchy classification is determined based on the lowest level input that is significant to the fair value measurement in its entirety. Investments classified within Level 3 have significant unobservable inputs used by the Global Valuation Committee in determining the price for Fair Valued Investments. Level 3 investments include equity or debt issued by Private Companies that may not have a secondary market and/or may have a limited number of investors. The categorization of a value determined for financial instruments is based on the pricing transparency of the financial instruments and is not necessarily an indication of the risks associated with investing in those securities.

FUND    NOTES  TO  FINANCIAL  STATEMENTS 59

Notes to Financial Statements  (continued)

4. SECURITIES AND OTHER INVESTMENTS

Inflation-Indexed Bonds: Inflation-indexed bonds (other than municipal inflation-indexed and certain corporate inflation-indexed bonds) are fixed-income securities whose principal value is periodically adjusted according to the rate of inflation. If the index measuring inflation rises or falls, the principal value of inflation-indexed bonds (other than municipal inflation-indexed and certain corporate inflation-indexed bonds) will be adjusted upward or downward, and consequently the interest payable on these securities (calculated with respect to a larger or smaller principal amount) will be increased or reduced, respectively. Any upward or downward adjustment in the principal amount of an inflation-indexed bond is included as interest income in the Statements of Operations, even though investors do not receive their principal until maturity. Repayment of the original bond principal upon maturity (as adjusted for inflation) is guaranteed in the case of U.S. Treasury inflation-indexed bonds. For bonds that do not provide a similar guarantee, the adjusted principal value of the bond repaid at maturity may be less than the original principal. With regard to municipal inflation-indexed bonds and certain corporate inflation-indexed bonds, the inflation adjustment is typically reflected in the semi-annual coupon payment. As a result, the principal value of municipal inflation-indexed bonds and such corporate inflation-indexed bonds does not adjust according to the rate of inflation.

Zero-Coupon Bonds: Zero-coupon bonds are normally issued at a significant discount from face value and do not provide for periodic interest payments. These bonds may experience greater volatility in market value than other debt obligations of similar maturity which provide for regular interest payments.

Preferred Stocks: Preferred stock has a preference over common stock in liquidation (and generally in receiving dividends as well), but is subordinated to the liabilities of the issuer in all respects. As a general rule, the market value of preferred stock with a fixed dividend rate and no conversion element varies inversely with interest rates and perceived credit risk, while the market price of convertible preferred stock generally also reflects some element of conversion value. Because preferred stock is junior to debt securities and other obligations of the issuer, deterioration in the credit quality of the issuer will cause greater changes in the value of a preferred stock than in a more senior debt security with similar stated yield characteristics. Unlike interest payments on debt securities, preferred stock dividends are payable only if declared by the issuer’s board of directors. Preferred stock also may be subject to optional or mandatory redemption provisions.

Securities Lending: Certain Funds may lend their securities to approved borrowers, such as brokers, dealers and other financial institutions. The borrower pledges and maintains with the Funds collateral consisting of cash, an irrevocable letter of credit issued by a bank, or securities issued or guaranteed by the U.S. Government. The initial collateral received by each Fund is required to have a value of at least 102% of the current value of the loaned securities for securities traded on U.S. exchanges and a value of at least 105% for all other securities. The collateral is maintained thereafter at a value equal to at least 100% of the current market value of the securities on loan. The market value of the loaned securities is determined at the close of each business day of the Fund and any additional required collateral is delivered to the Fund, or excess collateral returned by the Fund, on the next business day. During the term of the loan, the Funds are entitled to all distributions made on or in respect of the loaned securities, but do not receive interest income on securities received as collateral. Loans of securities are terminable at any time and the borrower, after notice, is required to return borrowed securities within the standard time period for settlement of securities transactions.

As of period end, any securities on loan were collateralized by cash and/or U.S. Government obligations. Cash collateral invested by the securities lending agent, BlackRock Institutional Trust Company, N.A. (“BTC”), if any, is disclosed in the Schedules of Investments. Any non-cash collateral received cannot be sold, re-invested or pledged by the Fund, except in the event of borrower default. The securities on loan, if any, are disclosed in the Funds Schedules of Investments. The market value of any securities on loan and the value of any related collateral are shown separately in the Statements of Assets and Liabilities as a component of investments at value — unaffiliated and collateral on securities loaned at value, respectively.

Securities lending transactions are entered into by the Funds under Master Securities Lending Agreements (each, an “MSLA”), which provide the right, in the event of default (including bankruptcy or insolvency), for the non-defaulting party to liquidate the collateral and calculate a net exposure to the defaulting party or request additional collateral. In the event that a borrower defaults, the Funds, as lender, would offset the market value of the collateral received against the market value of the securities loaned. When the value of the collateral is greater than that of the market value of the securities loaned, the lender is left with a net amount payable to the defaulting party. However, bankruptcy or insolvency laws of a particular jurisdiction may impose restrictions on or prohibitions against such a right of offset in the event of an MSLA counterparty’s bankruptcy or insolvency. Under the MSLA, absent an event of default, the borrower can resell or re-pledge the loaned securities, and a Fund can reinvest cash collateral received in connection with loaned securities. Upon an event of default, the parties’ obligations to return the securities or collateral to the other party are extinguished, and the parties can resell or re-pledge the loaned securities or the collateral received in connection with the loaned securities in order to satisfy the defaulting party’s net payment obligation for all transactions under the MSLA. The defaulting party remains liable for any deficiency.

As of period end, the following table is a summary of the International Index securities on loan by counterparty which are subject to offset under an MSLA:

			Securities	Cash Collateral				Non-Cash Collateral				Net
Counterparty	Loaned at Value					Received	(a)			Received at Fair Value	(a)	Amount
Credit Suisse Securities (USA) LLC		$	1,527,009		$	(1,527,009	)		$	—			$	—
Goldman Sachs & Co. LLC			1,700,693			(1,700,693	)			—				—
J.P. Morgan Securities LLC			3,038,638			(3,038,638	)			—				—
Morgan Stanley & Co. LLC			8,710,380			(8,710,380	)			—				—
Wells Fargo Bank N.A.			2,112,773			(2,112,773	)			—				—
		$	17,089,493		$	(17,089,493	)		$	—			$	—

^(a) Collateral received in excess of the market value of securities on loan is not presented in this table. The total cash collateral received by each Fund is disclosed in the Fund’s Statements of Assets and Liabilities.

The risks of securities lending include the risk that the borrower may not provide additional collateral when required or may not return the securities when due. To mitigate these risks, the Funds benefit from a borrower default indemnity provided by BlackRock, Inc. (“BlackRock”). BlackRock’s indemnity allows for full replacement of the securities loaned to the extent the collateral received does not cover the value on the securities loaned in the event of borrower default. Each Fund could incur a loss if the value of an

60 2 0 2 1   BLACK ROCK  ANNUAL  REPORT  TO  SHAREHOLDERS

Notes to Financial Statements  (continued)

investment purchased with cash collateral falls below the market value of loaned securities or if the value of an investment purchased with cash collateral falls below the value of the original cash collateral received. Such losses are borne entirely by the Funds.

5. DERIVATIVE FINANCIAL INSTRUMENTS

The Funds engage in various portfolio investment strategies using derivative contracts both to increase the returns of the Funds and/or to manage their exposure to certain risks such as credit risk, equity risk, interest rate risk, foreign currency exchange rate risk, commodity price risk or other risks (e.g., inflation risk). Derivative financial instruments categorized by risk exposure are included in the Schedules of Investments. These contracts may be transacted on an exchange or over-the-counter (“OTC”).

Futures Contracts: Futures contracts are purchased or sold to gain exposure to, or manage exposure to, changes in interest rates (interest rate risk) and changes in the value of equity securities (equity risk) or foreign currencies (foreign currency exchange rate risk).

Futures contracts are exchange-traded agreements between the Funds and a counterparty to buy or sell a specific quantity of an underlying instrument at a specified price and on a specified date. Depending on the terms of a contract, it is settled either through physical delivery of the underlying instrument on the settlement date or by payment of a cash amount on the settlement date. Upon entering into a futures contract, the Funds are required to deposit initial margin with the broker in the form of cash or securities in an amount that varies depending on a contract’s size and risk profile. The initial margin deposit must then be maintained at an established level over the life of the contract. Amounts pledged, which are considered restricted, are included in cash pledged for futures contracts in the Statements of Assets and Liabilities.

Securities deposited as initial margin are designated in the Schedules of Investments and cash deposited, if any, are shown as cash pledged for futures contracts in the Statements of Assets and Liabilities. Pursuant to the contract, the Funds agree to receive from or pay to the broker an amount of cash equal to the daily fluctuation in market value of the contract (“variation margin”). Variation margin is recorded as unrealized appreciation (depreciation) and, if any, shown as variation margin receivable (or payable) on futures contracts in the Statements of Assets and Liabilities. When the contract is closed, a realized gain or loss is recorded in the Statements of Operations equal to the difference between the notional amount of the contract at the time it was opened and the notional amount at the time it was closed. The use of futures contracts involves the risk of an imperfect correlation in the movements in the price of futures contracts and interest rates, foreign currency exchange rates or underlying assets.

6. INVESTMENT ADVISORY AGREEMENT AND OTHER TRANSACTIONS WITH AFFILIATES

Investment Advisory: Each of the Trust and the Corporation, on behalf of the Funds, entered into an Investment Advisory Agreement with the Manager, the Funds’ investment adviser and an indirect, wholly-owned subsidiary of BlackRock, Inc. (“BlackRock”), to provide investment advisory and administrative services. The Manager is responsible for the management of each Fund’s portfolio and provides the personnel, facilities, equipment and certain other services necessary to the operations of each Fund.

For such services, each Fund pays the Manager a monthly fee at an annual rate equal to the following percentages of the average daily value of each Fund’s net assets.

	Municipal Bond Index			Short-Term TIPS Bond Index			International Index
Investment advisory fees		0.10	%		0.01	%	0.01%

Service Fees: The Funds entered into a Distribution Agreement and Distribution and Service Plans with BlackRock Investments, LLC (“BRIL”), an affiliate of the Manager. Pursuant to the Distribution and Service Plan and in accordance with Rule 12b-1 under the 1940 Act, each Fund pays BRIL ongoing service and distribution fees. The fees are accrued daily and paid monthly at annual rates based upon the average daily net assets of the relevant share class of each Fund as follows:

Municipal Bond Index

Short-Term TIPS Bond Index

International Index

Small Cap Index

Share Class

Service Fees

Distribution Fees

Service Fees

Distribution Fees

Service Fees

Distribution Fees

Service Fees

Distribution Fees

Investor A

0.25

%

N/A

0.25

%

N/A

0.25

%

N/A

0.25

%

N/A

Investor P

0.25

N/A

N/A

N/A

0.25

N/A

0.25

N/A

BRIL and broker-dealers, pursuant to sub-agreements with BRIL, provide shareholder servicing and distribution services to the Funds. The ongoing service and/or distribution fee compensates BRIL and each broker-dealer for providing shareholder servicing and/or distribution related services to shareholders.

For the year ended December 31, 2021, the following table shows the class specific service and distribution fees borne directly by each share class of each Fund:

Fund Name	Investor A		Investor P		Total
Municipal Bond Index	$	59,315	$	763,640	$   822,955
Short-Term TIPS Bond Index		3,781		—	3,781
International Index		944,772		382,168	1,326,940
Small Cap Index		663,459		911,771	1,575,230

Administration: The Corporation, on behalf of Small Cap Index and International Index, entered into an Administration Agreement with BlackRock Advisors, LLC (the “Administrator”), an indirect, wholly-owned subsidiary of BlackRock, to provide administrative services (other than investment advice and related portfolio activities). For such services, Small Cap Index pays the Administrator a monthly fee at an annual rate of 0.04% of the average daily net assets of Small Cap Index. Small Cap Index does not pay an investment advisory fee or investment management fee. Effective January 1, 2021 for International Index, the Administrator is entitled to receive for these administrative services an annual fee of 0.08% based on the average daily net assets of each Fund’s Institutional, Investor A and Investor P Shares and 0.03% of the average daily net assets of Class K Shares.

FUND   NOTES  TO  FINANCIAL  STATEMENTS 61

Notes to Financial Statements  (continued)

For the year ended December 31, 2021, the following table shows the class specific administration fees borne directly by each share class of each Fund:

Fund Name	Institutional		Investor A		Investor P		Class K		Total
International Index	$	863,518	$	302,360	$	122,296	$	1,822,881	$	3,111,055

Transfer Agent: Pursuant to written agreements, certain financial intermediaries, some of which may be affiliates, provide the Funds with sub-accounting, recordkeeping, sub-transfer agency and other administrative services with respect to servicing of underlying investor accounts. For these services, these entities receive an asset-based fee or an annual fee per shareholder account, which will vary depending on share class and/or net assets. For the year ended December 31, 2021, the Funds did not pay any amounts to affiliates in return for these services.

The Manager maintains a call center that is responsible for providing certain shareholder services to the Funds. Shareholder services include responding to inquiries and processing purchases and sales based upon instructions from shareholders. For the year ended December 31, 2021, each Fund reimbursed the Manager the following amounts for costs incurred in running the call center, which are included in transfer agent — class specific in the Statements of Operations:

Fund Name	Institutional		Investor A		Investor P		Class K		Total
Municipal Bond Index	$	30	$	7,182	$	1,327	$	17	$	8,556
Short-Term TIPS Bond Index		54		533		—		1,023		1,610
Small Cap Index		6,324		34,055		3,914		4,995		49,288

For the year ended December 31, 2021, the following table shows the class specific transfer agent fees borne directly by each share class of each Fund:

Fund Name	Institutional		Investor A		Investor P		Class K		Total
Municipal Bond Index	$	5,358	$	21,208	$	167,141	$	67	$	193,774
Short-Term TIPS Bond Index		98		2,736		—		12,165		14,999
Small Cap Index		268,945		240,240		257,364		80,397		846,946

Other Fees: For the year ended December 31, 2021, affiliates earned underwriting discounts, direct commissions and dealer concessions on sales of each Fund’s Investor P Shares as follows:

Fund Name	Investor P
Municipal Bond Index	$    11,383
International Index	10,407
Small Cap Index	22,525

For the year ended December 31, 2021, affiliates received CDSCs as follows:

Fund Name	Investor P
Municipal Bond Index	$        179
Small Cap Index	8

Expense Limitations, Waivers, Reimbursements, and Recoupments: The Manager contractually agreed to waive its investment advisory fees by the amount of investment advisory fees each Fund pays to the Manager indirectly through its investment in affiliated money market funds (the “affiliated money market fund waiver”) through June 30, 2023 with respect to Municipal Bond Index, Short-Term TIPS Bond Index and International Index. The contractual agreement may be terminated upon 90 days’ notice by a majority of the directors who are not “interested persons” of the Trust or the Corporation, as defined in the 1940 Act (“Independent Directors”), or by a vote of a majority of the outstanding voting securities of a Fund. The amount of waivers and/or reimbursements of fees and expenses made pursuant to the expense limitations described below will be reduced by the amount of the affiliated money market fund waiver. These amounts are included in fees waived and/or reimbursed by the Manager in the Statements of Operations. For the year ended December 31, 2021, the amounts waived were as follows:

Fund Name	Fees Waived and/or Reimbursed by the Manager
Municipal Bond Index	$	1,120
Short-Term TIPS Bond Index		1,377
International Index		10,986

The Manager has contractually agreed to waive its investment advisory fee with respect to any portion of each Fund’s assets invested in affiliated equity and fixed-income mutual funds and affiliated exchange-traded funds that have a contractual management fee through June 30, 2023 with respect to Municipal Bond Index, Short-Term TIPS Bond Index and International Index. The contractual agreement may be terminated upon 90 days’ notice by a majority of the Independent Trustees, or by a vote of a majority of the outstanding voting securities of a Fund. For the year ended December 31, 2021, there were no fees waived and/or reimbursed by the Manager pursuant to this arrangement.

The Manager contractually agreed to waive and/or reimburse fees or expenses in order to limit expenses, excluding interest expense, dividend expense, tax expense, acquired fund fees and expenses, and certain other fund expenses, which constitute extraordinary expenses not incurred in the ordinary course of each Fund’s business (“expense limitation”). The expense limitations as a percentage of average daily net assets are as follows:

Fund Name	Institutional			Investor A			Investor P			Class K
Municipal Bond Index		0.25	%		0.50	%		0.50	%		0.20	%

62 2 0 2 1   BLACK ROCK  ANNUAL  REPORT  TO  SHAREHOLDERS

Notes to Financial Statements  (continued)

Fund Name	Institutional			Investor A			Investor P			Class K
Short-Term TIPS Bond Index		0.11	%		0.36	%		—			0.06	%
Small Cap Index		0.12			0.37			0.37	%		0.07

The Manager has agreed not to reduce or discontinue the contractual expense limitations through June 30, 2023 with respect to Municipal Bond Index, Short-Term TIPS Bond Index and Small-Cap Index, unless approved by the Board, including a majority of the Independent Directors, or by a vote of a majority of the outstanding voting securities of a Fund. For the year ended December 31, 2021, amounts included in the Statements of Operations were as follows:

Fund Name	Fees Waived and/or Reimbursed by the Manager		Fees Waived and/or Reimbursed by the Administrator
Municipal Bond Index	$	1,981	$	—
Short-Term TIPS Bond Index		165,815		—
Small Cap Index		—		4,369

With respect to International Index, the fees and expenses of the Fund’s Independent Trustees, counsel to the Independent Trustees and the Fund’s independent registered public accounting firm (together, the “independent expenses”) are paid directly by the Fund. The manager has contractually agreed to reimburse the Fund or provide an offsetting credit for such independent expenses through June 30, 2031. This amount is included in fees waived and/or reimbursed by the Manager in the Statement of Operations. For the year ended December 31, 2021, the amount waived and/or reimbursed was $174,224.

For the year ended December 31, 2021, class specific expense waivers and/or reimbursements are as follows:

	Transfer Agent Fees Waived and/or Reimbursed - Class Specific
Fund Name	Institutional		Investor A		Investor P		Class K		Total
Municipal Bond Index	$	189	$	5,974	$	4,062	$	52	$	10,277
Short-Term TIPS Bond Index		—		1,982		—		12,163		14,145
Small Cap Index		16,698		86,453		45,416		2,048		150,615

With respect to the contractual expense limitation, if during a Fund’s fiscal year the operating expenses of a share class, that at any time during the prior two fiscal years received a waiver and/or reimbursement from the Manager, are less than the current expense limitation for that share class, the Manager is entitled to be reimbursed by such share class up to the lesser of: (a) the amount of fees waived and/or expenses reimbursed during those prior two fiscal years under the agreement and (b) an amount not to exceed either the current expense limitation of that share class or the expense limitation of the share class in effect at the time that the share class received the applicable waiver and/or reimbursement, provided that:

(1) each Fund, of which the share class is a part, has more than $50 million in assets for the fiscal year, and

(2) the Manager or an affiliate continues to serve as a Fund’s investment adviser or administrator.

This repayment applies only to the contractual expense limitation on net expenses and does not apply to the contractual investment advisory fee waiver described above or any voluntary waivers that may be in effect from time to time. Effective February 16, 2023 for Short-Term TIPS Bond Index and November 16, 2025 for Municipal Bond Index, the repayment arrangement between each Fund and the Manager pursuant to which such Fund may be required to repay amounts waived and/or reimbursed under each Fund’s contractual caps on net expenses will be terminated.

For the year ended December 31, 2021, the Manager recouped the following fund level and class specific waivers and/or reimbursements previously recorded by the Funds:

Fund Name	Institutional		Investor P
Municipal Bond Index	$	52	$	9,527
Short-Term TIPS Bond Index		886		—

As of December 31, 2021, the fund level and class specific waivers and/or reimbursements subject to possible future recoupment under the expense limitation agreement are as follows:

	Expiring
Fund Name/Fund Level/Share Class	December 31, 2022		December 31, 2023
Municipal Bond Index
Fund Level	$	16,665	$	1,981
Institutional		—		189
Investor A		3,359		5,974
Investor P		—		4,062
Class K		35		52

	Expiring
Fund Name/Fund Level/Share Class	December 31, 2022		February 16, 2023
Short-Term TIPS Bond Index
Fund Level	$	202,508	$	165,815

FUND  NOTES  TO  FINANCIAL  STATEMENTS 63

Notes to Financial Statements  (continued)

	Expiring
Fund Name/Fund Level/Share Class	December 31, 2022	February 16, 2023
Institutional	—	—
Investor A	1,581	1,982
Class K	8,574	12,163

The following fund level and class specific waivers and/or reimbursements previously recorded by the Funds, which were subject to recoupment by the Manager, expired on December 31, 2021:

Fund Name/Fund Level/Share Class	Expired December 31, 2021
Municipal Bond Index
Fund Level	$	117,994
Institutional		—
Investor A		20,437
Investor P		—
Class K		38
Short-Term TIPS Bond Index
Fund Level		178,375
Institutional		—
Investor A		1,410
Class K		3,831

Securities Lending: The U.S. Securities and Exchange Commission (“SEC”) has issued an exemptive order which permits BTC, an affiliate of the Manager, to serve as securities lending agent for the Funds, subject to applicable conditions. As securities lending agent, BTC bears all operational costs directly related to securities lending, including any custodial costs. The Funds are responsible for fees in connection with the investment of cash collateral received for securities on loan (the “collateral investment fees”). The cash collateral is invested in a money market fund, BlackRock Cash Funds: Institutional or BlackRock Cash Funds: Treasury, managed by the Manager or its affiliates. However, BTC has agreed to reduce the amount of securities lending income it receives in order to effectively limit the collateral investment fees the Funds bear to an annual rate of 0.04%. The SL Agency Shares of such money market fund will not be subject to a sales load, distribution fee or service fee. The money market fund in which the cash collateral has been invested may, under certain circumstances, impose a liquidity fee of up to 2% of the value redeemed or temporarily restrict redemptions for up to 10 business days during a 90 day period, in the event that the money market fund’s weekly liquid assets fall below certain thresholds.

Securities lending income is equal to the total of income earned from the reinvestment of cash collateral, net of fees and other payments to and from borrowers of securities, and less the collateral investment fees. Each Fund retains a portion of securities lending income and remits a remaining portion to BTC as compensation for its services as securities lending agent.

Pursuant to the current securities lending agreement, each Fund retains 82% of securities lending income (which excludes collateral investment fees), and this amount retained can never be less than 70% of the total of securities lending income plus the collateral investment fees.

In addition, commencing the business day following the date that the aggregate securities lending income earned across the BlackRock Multi-Asset Complex in a calendar year exceeds a specified threshold, each Fund, pursuant to the securities lending agreement, will retain for the remainder of that calendar year securities lending income in an amount equal to 85% of securities lending income (which excludes collateral investment fees), and this amount retained can never be less than 70% of the total of securities lending income plus the collateral investment fees.

The share of securities lending income earned by each Fund is shown as securities lending income — affiliated — net in the Statements of Operations. For the year ended December 31, 2021, each Fund paid BTC the following amounts for securities lending agent services:

Fund Name	Amounts
Short-Term TIPS Bond Index	$	827
International Index		71,853

Interfund Lending: In accordance with an exemptive order (the “Order”) from the SEC, each Fund may participate in a joint lending and borrowing facility for temporary purposes (the “Interfund Lending Program”), subject to compliance with the terms and conditions of the Order, and to the extent permitted by each Fund’s investment policies and restrictions. Each Fund is currently permitted to borrow and lend under the Interfund Lending Program.

A lending BlackRock fund may lend in aggregate up to 15% of its net assets but may not lend more than 5% of its net assets to any one borrowing fund through the Interfund Lending Program. A borrowing BlackRock fund may not borrow through the Interfund Lending Program or from any other source more than 33 1/3% of its total assets (or any lower threshold provided for by the fund’s investment restrictions). If a borrowing BlackRock fund’s total outstanding borrowings exceed 10% of its total assets, each of its outstanding interfund loans will be subject to collateralization of at least 102% of the outstanding principal value of the loan. All interfund loans are for temporary or emergency purposes and the interest rate to be charged will be the average of the highest current overnight repurchase agreement rate available to a lending fund and the bank loan rate, as calculated according to a formula established by the Board.

64 2 0 2 1   BLACK ROCK  ANNUAL  REPORT  TO  SHAREHOLDERS

Notes to Financial Statements  (continued)

During the year ended December 31, 2021, the Funds did not participate in the Interfund Lending Program.

Directors and Officers: Certain directors and/or officers of the Trust and the Corporation are directors and/or officers of BlackRock or its affiliates. The Funds reimburse the Manager for a portion of the compensation paid to the Trust’s and the Corporation’s Chief Compliance Officer, which is included in Directors and Officer in the Statements of Operations.

Other Transactions: International Index may purchase securities from, or sell securities to, an affiliated fund provided the affiliation is due solely to having a common investment adviser, common officers, or common directors. For the year ended December 31, 2021, the purchase and sale transactions and any net realized gains (losses) with affiliated funds in compliance with Rule 17a-7 under the 1940 Act were as follows:

Fund Name	Purchases		Sales		Net Realized Gain (Loss)
International Index	$	263,173,808	$	17,729,883	$	(1,091,789	)

7. PURCHASES AND SALES

For the year ended December 31, 2021, purchases and sales of investments, excluding short-term investments, were as follows:

Fund Name	Purchases		Sales
Municipal Bond Index	$	23,545,258	$	31,134,850
Short-Term TIPS Bond Index		49,861,843		7,590,065
International Index		1,493,139,538		208,046,846

8. INCOME TAX INFORMATION

It is each Fund’s policy to comply with the requirements of the Internal Revenue Code of 1986, as amended, applicable to regulated investment companies, and to distribute substantially all of its taxable income to its shareholders. Therefore, no U.S. federal income tax provision is required.

Each Fund files U.S. federal and various state and local tax returns. No income tax returns are currently under examination. The statute of limitations on each Fund’s U.S. federal tax returns generally remains open for a period of three fiscal years after they are filed. The statutes of limitations on each Fund’s state and local tax returns may remain open for an additional year depending upon the jurisdiction.

Management has analyzed tax laws and regulations and their application to the Funds as of December 31, 2021, inclusive of the open tax return years, and does not believe that there are any uncertain tax positions that require recognition of a tax liability in the Funds’ financial statements.

U.S. GAAP requires that certain components of net assets be adjusted to reflect permanent differences between financial and tax reporting. These reclassifications have no effect on net assets or NAVs per share. As of period end, permanent differences attributable to certain deemed distributions were reclassified to the following accounts:

Fund Name	Paid-in Capital		Accumulated Earnings (Loss)
Small Cap Index	$	18,012,358	$	(18,012,358	)

The tax character of distributions paid was as follows:

Fund Name	Year Ended 12/31/21		Year Ended 12/31/20
Municipal Bond Index
Tax-exempt income(a)	$	7,302,123	$	7,767,473
Ordinary income		—		11,616
Long-term capital gains		604,105		558,912
	$	7,906,228	$	8,338,001
Short-Term TIPS Bond Index
Ordinary income	$	3,724,206	$	491,934
International Index
Ordinary income	$	249,650,725	$	127,762,008
Small Cap Index
Ordinary income	$	75,850,658	$	33,976,890
Long-term capital gains		162,052,657		4,166,241
	$	237,903,315	$	38,143,131

^(a) The Funds designate these amounts paid during the fiscal year ended December 31, 2021, as exempt-interest dividends.

FUND   NOTES  TO  FINANCIAL  STATEMENTS 65

Notes to Financial Statements  (continued)

As of December 31, 2021, the tax components of accumulated earnings (loss) were as follows:

Fund Name		Undistributed Tax-Exempt Income		Undistributed Ordinary Income		Undistributed Long-Term Capital Gains		Non-Expiring Capital Loss Carryforwards(a)			Net Unrealized Gains (Losses)(b)		Qualified Late-Year Loss(c)			Total
Municipal Bond Index	$	253,969	$	—	$	105,270	$	—		$	24,106,733	$	—		$	24,465,972
Short-Term TIPS Bond Index		—		19,960		—		(68,856	)		1,547,759		(239	)		1,498,624
International Index		—		12,612,619		—		(949,177,340	)		2,183,634,549		(4,394,897	)		1,242,674,931
Small Cap Index		—		1,057,436		7,811,321		—			851,494,060		—			860,362,817

^(a) Amounts available to offset future realized capital gains.

^(b) The difference between book-basis and tax-basis net unrealized gains (losses) was attributable primarily to the timing of income recognition on partnership interests, amortization methods on fixed income securities, the tax deferral of losses on wash sales, the realization for tax purposes of unrealized gains / (losses) on certain futures and foreign currency contracts, the characterization of corporate actions and the realization for tax purposes of unrealized gains on investments in passive foreign investment companies.

^(c) The Fund has elected to defer certain qualified late-year losses and recognize such losses in the next taxable year.

During the year ended December 31, 2021, the Funds listed below utilized the following amounts of their respective capital loss carryforward:

Fund Name	Amounts
Short-Term TIPS Bond Index	$	11,969

As of December 31, 2021, gross unrealized appreciation and depreciation based on cost of investments (including short positions and derivatives, if any) for U.S. federal income tax purposes were as follows:

Fund Name	Tax Cost		Gross Unrealized Appreciation		Gross Unrealized Depreciation			Net Unrealized Appreciation (Depreciation)
Municipal Bond Index	$	300,772,046	$	24,127,398	$	(20,665	)	$	24,106,733
Short-Term TIPS Bond Index		103,698,222		1,668,852		(121,093	)		1,547,759
International Index		6,296,219,431		2,659,951,332		(476,381,323	)		2,183,570,009

9. BANK BORROWINGS

The Trust and the Corporation, on behalf of the Funds, along with certain other funds managed by the Manager and its affiliates (“Participating Funds”), is a party to a 364-day, $2.25 billion credit agreement with a group of lenders. Under this agreement, the Funds may borrow to fund shareholder redemptions. Excluding commitments designated for certain individual funds, the Participating Funds, including the Funds, can borrow up to an aggregate commitment amount of $1.75 billion at any time outstanding, subject to asset coverage and other limitations as specified in the agreement. The credit agreement has the following terms: a fee of 0.10% per annum on unused commitment amounts and interest at a rate equal to the higher of (a) one-month London Interbank Offered Rate (“LIBOR”) (but, in any event, not less than 0.00%) on the date the loan is made plus 0.80% per annum or (b) the Fed Funds rate (but, in any event, not less than 0.00%) in effect from time to time plus 0.80% per annum on amounts borrowed. The agreement expires in April 2022 unless extended or renewed. These fees were allocated among such funds based upon portions of the aggregate commitment available to them and relative net assets of Participating Funds. During the year ended December 31, 2021, the Funds did not borrow under the credit agreement.

10. PRINCIPAL RISKS

In the normal course of business, the Funds invest in securities or other instruments and may enter into certain transactions, and such activities subject each Fund to various risks, including among others, fluctuations in the market (market risk) or failure of an issuer to meet all of its obligations. The value of securities or other instruments may also be affected by various factors, including, without limitation: (i) the general economy; (ii) the overall market as well as local, regional or global political and/or social instability; (iii) regulation, taxation or international tax treaties between various countries; or (iv) currency, interest rate and price fluctuations. Local, regional or global events such as war, acts of terrorism, the spread of infectious illness or other public health issues, recessions, or other events could have a significant impact on the Funds and their investments. Each Fund’s prospectus provides details of the risks to which each Fund is subject.

Short-Term TIPS Bond Index and International Index may be exposed to additional risks when reinvesting cash collateral in money market funds that do not seek to maintain a stable NAV per share of $1.00, which may be subject to redemption gates or liquidity fees under certain circumstances.

Market Risk: Municipal Bond Index and Short-Term TIPS Bond Index may be exposed to prepayment risk, which is the risk that borrowers may exercise their option to prepay principal earlier than scheduled during periods of declining interest rates, which would force each Fund to reinvest in lower yielding securities. Municipal Bond Index and Short-Term TIPS Bond Indexmay also be exposed to reinvestment risk, which is the risk that income from each Fund’s portfolio will decline if each Fund invests the proceeds from matured, traded or called fixed-income securities at market interest rates that are below each Fund portfolio’s current earnings rate.

Municipal securities are subject to the risk that litigation, legislation or other political events, local business or economic conditions, credit rating downgrades, or the bankruptcy of the issuer could have a significant effect on an issuer’s ability to make payments of principal and/or interest or otherwise affect the value of such securities. Municipal securities can be significantly affected by political or economic changes, including changes made in the law after issuance of the securities, as well as uncertainties in the municipal market related to, taxation, legislative changes or the rights of municipal security holders, including in connection with an issuer insolvency. Municipal securities backed by current or anticipated revenues from a specific project or specific assets can be negatively affected by the discontinuance of the tax benefits supporting the project

66 2 0 2 1   BLACK ROCK  ANNUAL  REPORT  TO  SHAREHOLDERS

Notes to Financial Statements  (continued)

or assets or the inability to collect revenues for the project or from the assets. Municipal securities may be less liquid than taxable bonds, and there may be less publicly available information on the financial condition of municipal security issuers than for issuers of other securities.

An outbreak of respiratory disease caused by a novel coronavirus has developed into a global pandemic and has resulted in closing borders, quarantines, disruptions to supply chains and customer activity, as well as general concern and uncertainty. The impact of this pandemic, and other global health crises that may arise in the future, could affect the economies of many nations, individual companies and the market in general in ways that cannot necessarily be foreseen at the present time. This pandemic may result in substantial market volatility and may adversely impact the prices and liquidity of a fund’s investments. The duration of this pandemic and its effects cannot be determined with certainty.

Valuation Risk: The market values of equities, such as common stocks and preferred securities or equity related investments, such as futures and options, may decline due to general market conditions which are not specifically related to a particular company. They may also decline due to factors which affect a particular industry or industries. A Fund may invest in illiquid investments. An illiquid investment is any investment that a Fund reasonably expects cannot be sold or disposed of in current market conditions in seven calendar days or less without the sale or disposition significantly changing the market value of the investment. A Fund may experience difficulty in selling illiquid investments in a timely manner at the price that it believes the investments are worth. Prices may fluctuate widely over short or extended periods in response to company, market or economic news. Markets also tend to move in cycles, with periods of rising and falling prices. This volatility may cause each Fund’s NAV to experience significant increases or decreases over short periods of time. If there is a general decline in the securities and other markets, the NAV of a Fund may lose value, regardless of the individual results of the securities and other instruments in which a Fund invests.

The price a Fund could receive upon the sale of any particular portfolio investment may differ from a Fund’s valuation of the investment, particularly for securities that trade in thin or volatile markets or that are valued using a fair valuation technique or a price provided by an independent pricing service. Changes to significant unobservable inputs and assumptions (i.e., publicly traded company multiples, growth rate, time to exit) due to the lack of observable inputs may significantly impact the resulting fair value and therefore a Fund’s results of operations. As a result, the price received upon the sale of an investment may be less than the value ascribed by a Fund, and a Fund could realize a greater than expected loss or lesser than expected gain upon the sale of the investment. A Fund’s ability to value its investments may also be impacted by technological issues and/or errors by pricing services or other third-party service providers.

Counterparty Credit Risk: The Funds may be exposed to counterparty credit risk, or the risk that an entity may fail to or be unable to perform on its commitments related to unsettled or open transactions, including making timely interest and/or principal payments or otherwise honoring its obligations. The Funds manage counterparty credit risk by entering into transactions only with counterparties that the Manager believes have the financial resources to honor their obligations and by monitoring the financial stability of those counterparties. Financial assets, which potentially expose the Funds to market, issuer and counterparty credit risks, consist principally of financial instruments and receivables due from counterparties. The extent of the Funds’ exposure to market, issuer and counterparty credit risks with respect to these financial assets is approximately their value recorded in the Statements of Assets and Liabilities, less any collateral held by the Funds.

A derivative contract may suffer a mark-to-market loss if the value of the contract decreases due to an unfavorable change in the market rates or values of the underlying instrument. Losses can also occur if the counterparty does not perform under the contract.

With exchange-traded futures and centrally cleared swaps, there is less counterparty credit risk to the Funds since the exchange or clearinghouse, as counterparty to such instruments, guarantees against a possible default. The clearinghouse stands between the buyer and the seller of the contract; therefore, credit risk is limited to failure of the clearinghouse. While offset rights may exist under applicable law, a Fund does not have a contractual right of offset against a clearing broker or clearinghouse in the event of a default (including the bankruptcy or insolvency). Additionally, credit risk exists in exchange-traded futures and centrally cleared swaps with respect to initial and variation margin that is held in a clearing broker’s customer accounts. While clearing brokers are required to segregate customer margin from their own assets, in the event that a clearing broker becomes insolvent or goes into bankruptcy and at that time there is a shortfall in the aggregate amount of margin held by the clearing broker for all its clients, typically the shortfall would be allocated on a pro rata basis across all the clearing broker’s customers, potentially resulting in losses to the Funds.

Concentration Risk: A diversified portfolio, where this is appropriate and consistent with a fund’s objectives, minimizes the risk that a price change of a particular investment will have a material impact on the NAV of a fund. The investment concentrations within each Fund’s portfolio are disclosed in its Schedule of Investments.

Certain Funds invest a substantial amount of their assets in issuers located in a single state or limited number of states. When a Fund concentrates its investments in this manner, it assumes the risk that economic, regulatory, political or social conditions affecting that state or group of states could have a significant impact on the fund and could affect the income from, or the value or liquidity of, the fund’s portfolio. Investment percentages in specific states or U.S. territories are presented in the Schedules of Investments.

Certain Funds invest a significant portion of their assets in securities within a single or limited number of market sectors. When a Fund concentrates its investments in this manner, it assumes the risk that economic, regulatory, political and social conditions affecting such sectors may have a significant impact on the Fund and could affect the income from, or the value or liquidity of, the Fund’s portfolio. Investment percentages in specific sectors are presented in the Schedules of Investments.

Certain Funds invest a significant portion of their assets in fixed-income securities and/or use derivatives tied to the fixed-income markets. Changes in market interest rates or economic conditions may affect the value and/or liquidity of such investments. Interest rate risk is the risk that prices of bonds and other fixed-income securities will increase as interest rates fall and decrease as interest rates rise. The Funds may be subject to a greater risk of rising interest rates due to the current period of historically low rates.

Certain Funds invest a significant portion of their assets in securities of issuers located in Europe or with significant exposure to European issuers or countries. The European financial markets have recently experienced volatility and adverse trends due to concerns about economic downturns in, or rising government debt levels of, several European countries. These events may spread to other countries in Europe and may affect the value and liquidity of certain of the Funds’ investments.

Responses to the financial problems by European governments, central banks and others, including austerity measures and reforms, may not work, may result in social unrest and may limit future growth and economic recovery or have other unintended consequences. Further defaults or restructurings by governments and others of their debt could

FUND  NOTES  TO  FINANCIAL  STATEMENTS 67

Notes to Financial Statements  (continued)

have additional adverse effects on economies, financial markets and asset valuations around the world. In addition, the United Kingdom has withdrawn from the European Union, and one or more other countries may withdraw from the European Union and/or abandon the Euro, the common currency of the European Union. The impact of these actions, especially if they occur in a disorderly fashion, is not clear but could be significant and far reaching.

Certain Funds invest a significant portion of their assets in securities of issuers located in Asia or with significant exposure to Asian issuers or countries. The Asian financial markets have recently experienced volatility and adverse trends due to concerns in several Asian countries regarding monetary policy, government intervention in the markets, rising government debt levels or economic downturns. These events may spread to other countries in Asia and may affect the value and liquidity of certain of the Funds’ investments.

LIBOR Transition Risk: The United Kingdom’s Financial Conduct Authority announced a phase out of the LIBOR. Although many LIBOR rates will cease to be published or no longer will be representative of the underlying market they seek to measure after December 31, 2021, a selection of widely used USD LIBOR rates will continue to be published through June 2023 in order to assist with the transition. The Funds may be exposed to financial instruments tied to LIBOR to determine payment obligations, financing terms, hedging strategies or investment value. The transition process away from LIBOR might lead to increased volatility and illiquidity in markets for, and reduce the effectiveness of new hedges placed against instruments whose terms currently include LIBOR. The ultimate effect of the LIBOR transition process on the Funds is uncertain.

11. CAPITAL SHARE TRANSACTIONS

Transactions in capital shares for each class were as follows:

	Year Ended 12/31/21						Year Ended 12/31/20
Fund Name / Share Class	Shares			Amounts			Shares			Amounts
Municipal Bond Index
Institutional
Shares sold		650,586		$	7,957,426			527,852		$	6,373,345
Shares issued in reinvestment of distributions		18,813			229,880			6,176			75,290
Shares redeemed		(197,401	)		(2,412,656	)		(76,103	)		(912,767	)
		471,998		$	5,774,650			457,925		$	5,535,868
Investor A
Shares sold		245,063		$	3,009,149			249,370		$	3,026,784
Shares issued in reinvestment of distributions		39,449			482,182			39,734			482,349
Shares redeemed		(262,213	)		(3,206,037	)		(372,148	)		(4,458,279	)
		22,299		$	285,294			(83,044	)	$	(949,146	)
Investor P
Shares sold		1,203,054		$	14,753,952			1,241,638		$	14,991,034
Shares issued in reinvestment of distributions		584,095			7,139,511			631,465			7,663,856
Shares redeemed		(3,476,299	)		(42,540,620	)		(3,844,076	)		(46,311,395	)
		(1,689,150	)	$	(20,647,157	)		(1,970,973	)	$	(23,656,505	)
Class K
Shares sold		—		$	—			—		$	—
Shares issued in reinvestment of distributions		—			—			—			—
Shares redeemed		—			—			—			—
		—		$	—			—		$	—
		(1,194,853	)	$	(14,587,213	)		(1,596,092	)	$	(19,069,783	)
	Year Ended 12/31/21						Year Ended 12/31/20
Fund Name / Share Class	Shares			Amounts			Shares			Amounts
Short-Term TIPS Bond Index
Institutional
Shares sold		305,714		$	3,176,102			1,538,927		$	15,651,855
Shares issued in reinvestment of distributions		69,714			725,448			15,764			160,899
Shares redeemed		(245,716	)		(2,546,137	)		(20,028	)		(197,981	)
		129,712		$	1,355,413			1,534,663		$	15,614,773
Investor A
Shares sold		171,246		$	1,784,237			105,697		$	1,079,056
Shares issued in reinvestment of distributions		5,235			54,679			708			7,134
Shares redeemed		(135,842	)		(1,420,598	)		(37,518	)		(378,343	)
		40,639		$	418,318			68,887		$	707,847

68 2 0 2 1   BLACK ROCK  ANNUAL  REPORT  TO  SHAREHOLDERS

Notes to Financial Statements  (continued)

	Year Ended 12/31/21						Year Ended 12/31/20
Fund Name / Share Class (continued)	Shares			Amounts			Shares			Amounts
Short-Term TIPS Bond Index (continued)
Class K
Shares sold		5,666,442		$	59,144,353			3,597,381		$	36,446,814
Shares issued in reinvestment of distributions		273,883			2,860,402			30,909			312,634
Shares redeemed		(1,808,850	)		(18,874,083	)		(1,224,848	)		(12,321,435	)
		4,131,475		$	43,130,672			2,403,442		$	24,438,013
		4,301,826		$	44,904,403			4,006,992		$	40,760,633

	Year Ended 12/31/21						Year Ended 12/31/20
Fund Name / Share Class	Shares			Amounts			Shares			Amounts
International Index
Institutional
Shares sold		23,127,179		$	364,411,891			36,055,673		$	432,943,808
Shares issued in reinvestment of distributions		1,891,131			29,454,601			1,213,193			17,385,549
Shares redeemed		(26,665,328	)		(423,071,784	)		(32,041,822	)		(387,367,687	)
		(1,647,018	)	$	(29,205,292	)		5,227,044		$	62,961,670
Investor A
Shares sold		8,903,542		$	138,961,412			10,068,833		$	124,413,156
Shares issued in reinvestment of distributions		655,384			10,142,811			421,138			5,991,136
Shares redeemed		(9,224,259	)		(144,389,967	)		(11,084,750	)		(139,444,486	)
		334,667		$	4,714,256			(594,779	)	$	(9,040,194	)
Investor P
Shares sold		605,499		$	9,492,012			539,569		$	6,667,907
Shares issued in reinvestment of distributions		270,934			4,177,007			174,418			2,472,469
Shares redeemed		(1,179,110	)		(18,358,506	)		(1,511,779	)		(18,866,767	)
		(302,677	)	$	(4,689,487	)		(797,792	)	$	(9,726,391	)
Class K
Shares sold		136,820,358		$	2,164,004,055			86,478,810		$	1,086,784,228
Shares issued in reinvestment of distributions		12,681,596			197,623,368			6,757,548			96,913,800
Shares redeemed		(62,785,698	)		(984,062,396	)		(238,407,702	)		(2,767,398,564	)
		86,716,256		$	1,377,565,027			(145,171,344	)	$	(1,583,700,536	)
		85,101,228		$	1,348,384,504			(141,336,871	)	$	(1,539,505,451	)

	Year Ended 12/31/21						Year Ended 12/31/20
Fund Name / Share Class	Shares			Amounts			Shares			Amounts
Small Cap Index
Institutional
Shares sold		8,680,716		$	240,094,727			7,274,334		$	131,368,583
Shares issued in reinvestment of distributions		1,322,710			33,755,049			196,130			4,588,006
Shares redeemed		(5,088,628	)		(138,990,726	)		(4,882,192	)		(88,356,989	)
		4,914,798		$	134,859,050			2,588,272		$	47,599,600
Investor A
Shares sold		3,401,943		$	94,188,064			3,519,232		$	64,827,304
Shares issued in reinvestment of distributions		640,818			16,377,948			129,265			3,018,237
Shares redeemed		(5,267,709	)		(146,988,976	)		(6,342,853	)		(117,082,253	)
		(1,224,948	)	$	(36,422,964	)		(2,694,356	)	$	(49,236,712	)
Investor P
Shares sold		1,120,863		$	30,459,520			922,473		$	16,362,434
Shares issued in reinvestment of distributions		968,853			24,668,150			170,625			3,975,291
Shares redeemed		(1,935,582	)		(52,802,385	)		(2,186,516	)		(40,047,212	)
		154,134		$	2,325,285			(1,093,418	)	$	(19,709,487	)

FUND   NOTES  TO  FINANCIAL  STATEMENTS 69

Notes to Financial Statements  (continued)

	Year Ended 12/31/21						Year Ended 12/31/20
Fund Name / Share Class (continued)	Shares			Amounts			Shares			Amounts
Small Cap Index (continued)
Class K
Shares sold		27,344,333		$	747,541,231			28,669,918		$	514,018,462
Shares issued in reinvestment of distributions		6,339,905			162,274,538			1,126,186			26,411,311
Shares redeemed		(20,752,569	)		(567,308,604	)		(27,354,595	)		(501,901,492	)
		12,931,669		$	342,507,165			2,441,509		$	38,528,281
		16,775,653		$	443,268,536			1,242,007		$	17,181,682

As of December 31, 2021, shares owned by BlackRock HoldCo 2, Inc., an affiliate of the Fund, were as follows:

Fund Name	Institutional		Investor A		Class K		Total
Short-Term TIPS Bond Index		5,000		5,000		90,000		100,000

As of December 31, 2021, shares owned by BlackRock Financial Management, Inc., an affiliate of the Funds, were as follows:

Fund Name	Institutional		Investor A		Investor P		Class K		Total
Municipal Bond Index		8,707		871		871		8,707		19,156
International Index		—		—		14,420		—		14,420
Small Cap Index		—		—		9,191		—		9,191

12. SUBSEQUENT EVENTS

Management has evaluated the impact of all subsequent events on the Funds through the date the financial statements were issued and has determined that there were no subsequent events requiring adjustment or additional disclosure in the financial statements.

70 2 0 2 1   BLACK ROCK  ANNUAL  REPORT  TO  SHAREHOLDERS

Report of Independent Registered Public Accounting Firm

To the Shareholders of iShares Municipal Bond Index Fund, iShares Short-Term TIPS Bond Index Fund, iShares MSCI EAFE International Index Fund, and iShares Russell 2000 Small-Cap Index Fund and the Board of Directors/Trustees of BlackRock Funds^SM and BlackRock Index Funds, Inc.:

Opinion on the Financial Statements and Financial Highlights

We have audited the accompanying statements of assets and liabilities of iShares Municipal Bond Index Fund and iShares Short-Term TIPS Bond Index Fund of BlackRock Funds^SM and iShares MSCI EAFE International Index Fund and iShares Russell 2000 Small-Cap Index Fund of BlackRock Index Funds, Inc. (collectively, the “Funds”), including the schedules of investments of iShares Municipal Bond Index Fund, iShares Short-Term TIPS Bond Index Fund, and iShares MSCI EAFE International Index Fund, as of December 31, 2021, the related statements of operations for the year then ended, the statements of changes in net assets for each of the two years in the period then ended, the financial highlights for the periods indicated in the table below, and the related notes. In our opinion, the financial statements and financial highlights present fairly, in all material respects, the financial position of the Funds as of December 31, 2021, and the results of their operations for the year then ended, the changes in their net assets for each of the two years in the period then ended, and the financial highlights for the periods indicated in the table below, in conformity with accounting principles generally accepted in the United States of America.

Fund	Financial Highlights
iShares Municipal Bond Index Fund	For each of the four years in the period ended December 31, 2021
iShares Short-Term TIPS Bond Index Fund	For each of the five years in the period ended December 31, 2021
iShares MSCI EAFE International Index Fund	For each of the five years in the period ended December 31, 2021
iShares Russell 2000 Small-Cap Index Fund	For each of the five years in the period ended December 31, 2021

The financial highlights of iShares Municipal Bond Index Fund for the year ended December 31, 2017 were audited by other auditors whose report dated February 27, 2018, expressed an unqualified opinion on those financial highlights.

Basis for Opinion

These financial statements and financial highlights are the responsibility of the Funds’ management. Our responsibility is to express an opinion on the Funds’ financial statements and financial highlights based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Funds in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements and financial highlights are free of material misstatement, whether due to error or fraud. The Funds are not required to have, nor were we engaged to perform, an audit of their internal control over financial reporting. As part of our audits we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of the Funds’ internal control over financial reporting. Accordingly, we express no such opinion.

Our audits included performing procedures to assess the risks of material misstatement of the financial statements and financial highlights, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements and financial highlights. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements and financial highlights. Our procedures included confirmation of securities owned as of December 31, 2021, by correspondence with the custodian and brokers; when replies were not received from brokers, we performed other auditing procedures. We believe that our audits provide a reasonable basis for our opinion.

Deloitte & Touche LLP

Boston, Massachusetts

February 24, 2022

We have served as the auditor of one or more BlackRock investment companies since 1992.

FUND  REPORT  OF  INDEPENDENT  REGISTERED  PUBLIC  ACCOUNTING  FIRM 71

Important Tax Information  (unaudited)

The following amounts, or maximum amounts allowable by law, are hereby designated as qualified dividend income for individuals for the fiscal year ended December 31, 2021:

Fund Name	Qualified Dividend Income
International Index	$	218,621,910
Small Cap Index		29,451,365

The following amounts, or maximum amounts allowable by law, are hereby designated as qualified business income for individuals for the fiscal year ended December 31, 2021:

Fund Name	Qualified Business Income
Small Cap Index	$	4,391,073

The Funds hereby designate the following amounts, or maximum amounts allowable by law, as capital gain dividends, subject to a long-term capital gains tax rate of not greater than 20%, for the fiscal year ended December 31, 2021:

Fund Name	20% Rate Long-Term Capital Gain Dividends
Municipal Bond Index	$	44,561
Small Cap Index		180,020,579

The Funds intend to pass through to their shareholders the following amounts, or maximum amounts allowable by law, of foreign source income earned and foreign taxes paid for the fiscal year ended December 31, 2021:

Fund Name	Foreign Source Income Earned		Foreign Taxes Paid
International Index	$	206,489,232	$	16,826,407

The Fund hereby designates the following amount, or maximum amount allowable by law, of distributions from direct federal obligation interest for the fiscal year ended December 31, 2021:

Fund Name	Federal Obligation Interest
Short-Term TIPS Bond Index	$	3,724,406

The law varies in each state as to whether and what percent of ordinary income dividends attributable to federal obligations is exempt from state income tax. Shareholders are advised to check with their tax advisers to determine if any portion of the dividends received is exempt from state income tax.

The following percentage, or maximum percentage allowable by law, of ordinary income distributions paid during the fiscal year ended December 31, 2021 qualified for the dividends-received deduction for corporate shareholders:

Fund Name	Dividends-Received    Deduction
Small Cap Index	37.81%

The Fund hereby designates the following amount, or maximum amount allowable by law, as interest income eligible to be treated as a Section 163(j) interest dividend for the fiscal year ended December 31, 2021:

Fund Name	Interest Dividend
Short-Term TIPS Bond Index	$	3,724,406

The Funds hereby designate the following amounts, or maximum amounts allowable by law, as interest-related dividends eligible for exemption from U.S. withholding tax for nonresident aliens and foreign corporations for the fiscal year ended December 31, 2021:

Fund Name	Interest Related Dividends		Qualified Short-Term Capital Gains
Short-Term TIPS Bond Index	$	3,724,406	$	—
Small Cap Index		—		40,788,717

72 2 0 2 1   BLACK ROCK   ANNUAL  REPORT   TO  SHAREHOLDERS

Series Portfolio Information    as of December 31,  2021 Master Small Cap Index Series

TEN LARGEST HOLDINGS

Security	Percent of Net Assets
iShares Russell 2000 ETF		1	%
AMC Entertainment Holdings, Inc., Class A		1
Synaptics, Inc.		1
Lattice Semiconductor Corp.		1
EastGroup Properties, Inc.		—	(a)
BJ’s Wholesale Club Holdings, Inc.		—	(a)
Tetra Tech, Inc.		—	(a)
Saia, Inc.		—	(a)
Ovintiv, Inc.		—	(a)
Tenet Healthcare Corp.		—	(a)

SECTOR ALLOCATION

Sector(b)	Percent of Net Assets
Health Care		18	%
Financials		16
Industrials		15
Information Technology		15
Consumer Discretionary		11
Real Estate		7
Energy		4
Materials		4
Consumer Staples		3
Communication Services		3
Utilities		3
Investment Companies		1
Short-Term Securities		6
Liabilities in Excess of Other Assets		(6	)

^(a) Rounds to less than 1% of net assets.

^(b) For Master Small Cap Index Series (the “Master Portfolio”) compliance purposes, the Master Portfolio’s sector classifications refer to one or more of the sector subclassifications used by one or more widely recognized market indexes or ratings group indexes, and/or as defined by the investment adviser. These definitions may not apply for purposes of this report, which may combine such sector sub-classifications for reporting ease.

SERIES  PORTFOLIO  INFORMATION 73

Schedule of Investments December 31, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Common Stocks
Advertising Agencies — 0.4%
Advantage Solutions, Inc.(a)(b)		114,518	$	918,434
Boston Omaha Corp., Class A(a)		31,949		917,895
Cardlytics, Inc.(a)		49,616		3,279,121
Chimera Investment Corp.		358,658		5,408,563
Clear Channel Outdoor Holdings, Inc.(a)		547,175		1,811,149
Emerald Holding, Inc.(a)		39,174		155,521
Entercom Communications Corp.(a)		178,691		459,236
Fluent, Inc.(a)		60,797		120,986
National CineMedia, Inc.		97,245		273,259
QuinStreet, Inc.(a)(b)		76,554		1,392,517
Thryv Holdings, Inc.(a)		11,521		473,859
Viad Corp.(a)		31,036		1,328,030
				16,538,570
Aerospace — 0.6%
AAR Corp.(a)		51,973		2,028,506
Aerojet Rocketdyne Holdings, Inc.		114,825		5,369,217
AeroVironment, Inc.(a)		34,922		2,166,212
AerSale Corp.(a)		14,018		248,679
Astronics Corp.(a)		36,144		433,728
Byrna Technologies, Inc.(a)(b)		28,185		376,270
Cadre Holdings, Inc.(a)		9,038		229,746
Ducommun, Inc.(a)		15,716		735,037
Kaman Corp.		42,238		1,822,570
Kratos Defense & Security Solutions, Inc.(a)		188,076		3,648,675
Macerich Co.		327,662		5,661,999
Moog, Inc., Class A		44,564		3,608,347
Triumph Group, Inc.(a)		96,585		1,789,720
				28,118,706
Agriculture, Fishing & Ranching — 0.3%
Andersons, Inc.		47,652		1,844,609
AquaBounty Technologies, Inc.(a)		77,821		163,424
Cadiz, Inc.(a)		33,554		129,519
Calavo Growers, Inc.		26,356		1,117,494
Cal-Maine Foods, Inc.		62,013		2,293,861
Fresh Del Monte Produce, Inc.		50,937		1,405,861
GrowGeneration Corp.(a)(b)		85,028		1,109,615
Limoneira Co.		25,358		380,370
MedAvail Holdings, Inc.(a)(b)		16,244		22,742
Sanderson Farms, Inc.		31,121		5,946,601
				14,414,096
Air Transport(a) — 0.5%
Air Transport Services Group, Inc.(b)		90,356		2,654,659
Allegiant Travel Co.		23,474		4,390,577
Atlas Air Worldwide Holdings, Inc.		44,080		4,148,809
Frontier Group Holdings, Inc.		52,782		716,252
Hawaiian Holdings, Inc.		76,108		1,398,104
Mesa Air Group, Inc.		50,631		283,534
SkyWest, Inc.		76,042		2,988,451
Spirit Airlines, Inc.(b)		151,224		3,304,244
Sun Country Airlines Holdings, Inc.		49,089		1,337,675
				21,222,305
Alternative Energy(a) — 0.3%
Aemetis, Inc.(b)		45,137		555,185
Alto Ingredients, Inc.		106,079		510,240
Ameresco, Inc., Class A		47,230		3,846,411
Centrus Energy Corp., Class A		13,577		677,628
Green Brick Partners, Inc.		46,392		1,407,069
Green Plains, Inc.		51,340		1,784,579

Security	Shares		Value
Alternative Energy (continued)
Infrastructure and Energy Alternatives, Inc.		43,682	$	401,874
REX American Resources Corp.		8,390		805,440
Sunnova Energy International, Inc.		131,841		3,681,001
				13,669,427
Aluminum — 0.2%
Arconic Corp.(a)		163,376		5,393,042
Century Aluminum Co.(a)(b)		78,532		1,300,490
Kaiser Aluminum Corp.		24,030		2,257,378
				8,950,910
Asset Management & Custodian — 1.1%
Artisan Partners Asset Management, Inc., Class A		89,949		4,285,170
Assetmark Financial Holdings, Inc.(a)		30,920		810,413
B. Riley Financial, Inc.		30,730		2,730,668
Brightsphere Investment Group, Inc.		88,735		2,271,616
Cohen & Steers, Inc.		37,827		3,499,376
Cowen, Inc., Class A		39,841		1,438,260
Diamond Hill Investment Group, Inc.		4,531		880,056
Federated Hermes, Inc.		142,529		5,356,240
Focus Financial Partners, Inc., Class A(a)(b)		91,319		5,453,571
GAMCO Investors, Inc., Class A		8,691		217,101
GCM Grosvenor, Inc., Class A		67,362		707,301
Hamilton Lane, Inc., Class A		53,303		5,523,257
Open Lending Corp., Class A(a)		159,784		3,591,944
Oppenheimer Holdings, Inc., Class A		13,902		644,636
PJT Partners, Inc., Class A(b)		35,998		2,667,092
Pzena Investment Management, Inc., Class A		27,206		257,641
Sculptor Capital Management, Inc.		36,904		787,900
StepStone Group, Inc., Class A		61,912		2,573,682
Virtus Investment Partners, Inc.		11,204		3,328,708
WisdomTree Investments, Inc.		213,451		1,306,320
				48,330,952
Auto Parts — 1.2%
Adient PLC(a)(b)		144,850		6,935,418
American Axle & Manufacturing Holdings, Inc.(a)		170,779		1,593,368
Canoo, Inc.(a)(b)		162,997		1,258,337
CarParts.com, Inc.(a)(b)		75,443		844,962
Dana, Inc.		222,219		5,071,038
Dorman Products, Inc.(a)		40,227		4,546,053
Fisker, Inc.(a)		249,830		3,929,826
Fox Factory Holding Corp.(a)		64,601		10,988,630
Gentherm, Inc.(a)		50,792		4,413,825
Lordstown Motors Corp., Class A(a)		233,619		805,985
Meritor, Inc.(a)		105,280		2,608,838
Standard Motor Products, Inc.		31,903		1,671,398
Stoneridge, Inc.(a)		40,062		790,824
Tenneco, Inc., Class A(a)		107,572		1,215,564
Visteon Corp.(a)		42,136		4,682,995
Workhorse Group, Inc.(a)(b)		188,524		821,965
XL Fleet Corp.(a)		61,159		202,436
XPEL Inc.(a)		28,102		1,918,804
				54,300,266
Auto Services — 0.2%
Goodyear Tire & Rubber Co.(a)		422,830		9,014,736
Back Office Support, HR & Consulting — 1.6%
ASGN, Inc.(a)		77,971		9,621,621
Atlas Technical Consultants, Inc.(a)(b)		22,742		191,488
Barrett Business Services, Inc.		11,581		799,784
CBIZ, Inc.(a)		74,391		2,910,176
Conduent, Inc.(a)		256,673		1,370,634
CRA International, Inc.		11,737		1,095,766

74 2 0 2 1   BLACK ROCK   ANNUAL   REPORT   TO   SHAREHOLDERS

Schedule of Investments   (continued) December 31, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Back Office Support, HR & Consulting (continued)
ExlService Holdings, Inc.(a)		50,331	$	7,286,419
Forrester Research, Inc.(a)		17,200		1,010,156
Hackett Group, Inc.		38,500		790,405
Heidrick & Struggles International, Inc.		29,596		1,294,233
HireQuest, Inc.		10,587		213,434
Huron Consulting Group, Inc.(a)		34,108		1,701,989
ICF International, Inc.		28,233		2,895,294
Insperity, Inc.		55,651		6,572,940
Kelly Services, Inc., Class A		52,428		879,217
Kforce, Inc.		31,362		2,359,050
Korn Ferry		82,509		6,248,406
Liquidity Services, Inc.(a)		40,114		885,717
Maximus, Inc.		94,414		7,521,963
NV5 Global, Inc.(a)		20,081		2,773,588
PAE, Inc.(a)(b)		106,559		1,058,131
Rekor Systems, Inc.(a)		53,352		349,456
Resources Connection, Inc.		47,710		851,146
StarTek, Inc.(a)(b)		27,578		143,957
Target Hospitality Corp.(a)		49,812		177,331
TriNet Group, Inc.(a)		62,303		5,934,984
TrueBlue, Inc.(a)		53,309		1,475,060
TTEC Holdings, Inc.		28,285		2,561,207
				70,973,552
Banks: Diversified — 8.0%
1st Source Corp.		25,200		1,249,920
Allegiance Bancshares, Inc.		31,564		1,332,316
Ambac Financial Group, Inc.(a)		68,315		1,096,456
Amerant Bancorp, Inc.(a)		40,461		1,397,928
American National Bankshares, Inc.		17,212		648,548
Ameris Bancorp		102,221		5,078,339
Arrow Financial Corp.		22,514		793,168
Associated Banc-Corp.		224,705		5,076,086
Atlantic Capital Bancshares, Inc.(a)		29,118		837,725
Atlantic Union Bankshares Corp.		114,822		4,281,712
BancFirst Corp.		27,025		1,906,884
Banco Latinoamericano de Comercio Exterior SA, Class E		48,028		797,265
Bancorp, Inc.(a)		77,374		1,958,336
Bank First Corp.(b)		10,024		724,134
Bank of Marin Bancorp		22,444		835,590
Bank of NT Butterfield & Son Ltd.		76,267		2,906,535
Banner Corp.		52,372		3,177,409
Bar Harbor Bankshares		21,850		632,121
Blue Ridge Bankshares, Inc.		21,103		377,744
Bridgewater Bancshares, Inc.(a)		35,112		621,131
Bryn Mawr Bank Corp.		29,867		1,344,314
Business First Bancshares, Inc.		28,633		810,600
Byline Bancorp, Inc.		37,376		1,022,234
Cadence Bank		223,939		6,671,143
Cambridge Bancorp		10,129		947,973
Camden National Corp.		23,340		1,124,054
Capital Bancorp, Inc.		13,728		359,674
Capital City Bank Group, Inc.		21,636		571,190
Capitol Federal Financial, Inc.		198,169		2,245,255
Capstar Financial Holdings, Inc.		27,812		584,886
Carter Bankshares, Inc.(a)		35,497		546,299
Cathay General Bancorp		113,031		4,859,203
CBTX, Inc.		31,455		912,195
Central Pacific Financial Corp.		36,134		1,017,895
CIT Group, Inc.		151,962		7,801,729
Citizens & Northern Corp.		21,059		550,061

Security	Shares		Value
Banks: Diversified (continued)
City Holding Co.		23,672	$	1,936,133
Civista Bancshares, Inc.		26,232		640,061
CNB Financial Corp.		23,280		616,920
Coastal Financial Corp.(a)		14,039		710,654
Columbia Banking System, Inc.		111,572		3,650,636
Columbia Financial, Inc.(a)		61,595		1,284,872
Community Bank System, Inc.		80,268		5,978,361
Community Trust Bancorp, Inc.		22,638		987,243
ConnectOne Bancorp, Inc.		54,957		1,797,643
CrossFirst Bankshares, Inc.(a)		70,864		1,106,187
Customers Bancorp, Inc.(a)		45,036		2,944,003
CVB Financial Corp.		196,554		4,208,221
Eagle Bancorp, Inc.		47,681		2,781,710
Eastern Bankshares, Inc.		261,999		5,284,520
Enterprise Bancorp, Inc.		13,849		622,097
Enterprise Financial Services Corp.		53,555		2,521,905
Equity Bancshares, Inc., Class A		20,806		705,948
Farmers National Banc Corp.		50,373		934,419
FB Financial Corp.		50,587		2,216,722
Fidelity D&D Bancorp, Inc.		6,449		380,491
Financial Institutions, Inc.		26,478		842,000
First Bancorp, Inc.		16,608		521,491
First BanCorp, Puerto Rico		315,153		4,342,808
First Bancorp/Southern Pines NC		51,199		2,340,818
First Bancshares, Inc.		32,134		1,241,015
First Bank/Hamilton		24,595		356,873
First Busey Corp.		77,953		2,114,085
First Commonwealth Financial Corp.		139,403		2,242,994
First Community Bancshares, Inc.		25,204		842,318
First Financial Bancorp		141,314		3,445,235
First Financial Bankshares, Inc.		198,367		10,084,978
First Financial Corp.		15,868		718,662
First Foundation, Inc.		57,517		1,429,873
First Internet Bancorp		14,564		685,091
First Interstate Bancsystem, Inc., Class A		62,564		2,544,478
First Merchants Corp.		85,114		3,565,425
First Mid Bancshares, Inc.		23,111		988,920
First Midwest Bancorp, Inc.		171,475		3,511,808
First of Long Island Corp.		40,270		869,429
Five Star Bancorp		17,219		516,570
Flagstar Bancorp, Inc.		78,762		3,775,850
FS Bancorp, Inc.		12,270		412,640
Fulton Financial Corp.		242,048		4,114,816
German American Bancorp, Inc.		38,518		1,501,432
Glacier Bancorp, Inc.		168,420		9,549,414
Great Western Bancorp, Inc.		80,841		2,745,360
Guaranty Bancshares, Inc.		11,719		440,400
Hancock Whitney Corp.		132,107		6,607,992
Hanmi Financial Corp.		35,695		845,258
HarborOne Bancorp, Inc.		79,912		1,185,894
HBT Financial, Inc.		16,051		300,635
Heartland Financial USA, Inc.		60,975		3,085,945
Heritage Commerce Corp.		96,249		1,149,213
Home BancShares, Inc.		233,363		5,682,389
Hope Bancorp, Inc.		162,875		2,395,891
Horizon Bancorp, Inc.		66,840		1,393,614
Howard Bancorp, Inc.(a)		20,178		439,679
Independent Bank Corp.		97,898		6,291,148
Independent Bank Group, Inc.		57,278		4,132,608
International Bancshares Corp.		81,607		3,459,321
Lakeland Bancorp, Inc.		75,630		1,436,214
Lakeland Financial Corp.		36,651		2,937,211

SERIES  SCHEDULE   OF  INVESTMENTS 75

Schedule of Investments   (continued) December 31, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Banks: Diversified (continued)
Live Oak Bancshares, Inc.(b)		48,894	$	4,267,957
Luther Burbank Corp.		30,326		425,777
Macatawa Bank Corp.		45,179		398,479
Mercantile Bank Corp.		22,520		788,876
Merchants Bancorp		16,391		775,786
Metrocity Bankshares, Inc.		28,203		776,429
Metropolitan Bank Holding Corp.(a)		14,713		1,567,376
Mid Penn Bancorp, Inc.		17,993		571,098
Midland States Bancorp, Inc.		32,587		807,832
MVB Financial Corp.		14,651		608,310
National Bank Holdings Corp., Class A		42,117		1,850,621
NBT Bancorp, Inc.		65,310		2,515,741
Nicolet Bankshares, Inc.(a)(b)		18,443		1,581,487
Northrim BanCorp, Inc.		9,948		432,340
OFG Bancorp		73,665		1,956,542
Old National Bancorp		241,751		4,380,528
Old Second Bancorp, Inc.		47,962		603,842
Origin Bancorp, Inc.		33,731		1,447,735
Orrstown Financial Services, Inc.		17,730		446,796
Pacific Premier Bancorp, Inc.		121,865		4,878,256
Park National Corp.		21,882		3,004,617
PCSB Financial Corp.		24,272		462,139
Peapack Gladstone Financial Corp.		30,765		1,089,081
Peoples Bancorp, Inc.		39,600		1,259,676
Peoples Financial Services Corp.		10,739		565,838
Pioneer Bancorp, Inc.(a)		20,117		227,724
Preferred Bank/Los Angeles CA		13,047		936,644
Primis Financial Corp.		32,511		488,965
Provident Financial Services, Inc.		116,700		2,826,474
QCR Holdings, Inc.		24,093		1,349,208
RBB Bancorp		26,421		692,230
Red River Bancshares, Inc.		7,783		416,391
Reliant Bancorp, Inc.		23,597		837,693
Renasant Corp.		83,410		3,165,409
Republic Bancorp, Inc., Class A		15,627		794,477
Republic First Bancorp, Inc.(a)		77,302		287,563
S&T Bancorp, Inc.		55,903		1,762,063
Sandy Spring Bancorp, Inc.		66,961		3,219,485
Seacoast Banking Corp. of Florida		81,313		2,877,667
ServisFirst Bancshares, Inc.		76,093		6,463,339
Sierra Bancorp		23,052		625,862
Silvergate Capital Corp., Class A(a)(b)		42,114		6,241,295
Simmons First National Corp., Class A		166,048		4,911,700
SmartFinancial, Inc.		21,356		584,300
South Plains Financial, Inc.		17,062		474,494
South State Corp.		106,974		8,569,687
Southern First Bancshares, Inc.(a)		11,833		739,444
Southside Bancshares, Inc.		48,411		2,024,548
Spirit of Texas Bancshares, Inc.		21,126		608,006
Stock Yards Bancorp, Inc.		36,772		2,348,995
Summit Financial Group, Inc.		19,115		524,707
Texas Capital Bancshares, Inc.(a)		77,685		4,680,521
Third Coast Bancshares, Inc.(a)		4,782		124,236
Tompkins Financial Corp.		22,163		1,852,384
TowneBank		103,982		3,284,791
Trico Bancshares		40,262		1,729,656
TriState Capital Holdings, Inc.(a)		44,534		1,347,599
Triumph Bancorp, Inc.(a)(b)		36,006		4,287,594
TrustCo Bank Corp.		30,655		1,021,118
Trustmark Corp.		95,350		3,095,061
UMB Financial Corp.		66,742		7,081,994
United Bankshares, Inc.		201,239		7,300,951

Security	Shares		Value
Banks: Diversified (continued)
United Community Banks, Inc.		120,164	$	4,318,694
Univest Financial Corp.		45,724		1,368,062
Valley National Bancorp		609,660		8,382,825
Veritex Holdings, Inc.		71,024		2,825,335
Washington Trust Bancorp, Inc.		26,664		1,503,050
WesBanco, Inc.		93,018		3,254,700
West BanCorp., Inc.		26,795		832,521
Westamerica BanCorp		40,498		2,337,950
				367,585,164
Banks: Savings, Thrift & Mortgage Lending — 1.0%
Amalgamated Financial Corp.		20,899		350,476
Axos Financial, Inc.(a)		87,022		4,865,400
Banc of California, Inc.		80,914		1,587,533
BankUnited, Inc.		135,480		5,732,159
Berkshire Hills Bancorp, Inc.		65,241		1,854,802
Brookline Bancorp, Inc.		112,560		1,822,346
Finance Of America Cos., Inc., Class A(a)		44,228		175,585
Flushing Financial Corp.		44,444		1,079,989
Great Southern Bancorp, Inc.		14,826		878,441
Heritage Financial Corp.		53,775		1,314,261
Hingham Institution for Savings		2,201		924,156
Home Bancorp, Inc.		12,224		507,418
Home Point Capital, Inc.		7,506		33,777
HomeStreet, Inc.		27,559		1,433,068
Investors Bancorp, Inc.		348,182		5,274,957
Kearny Financial Corp.		98,841		1,309,643
Ladder Capital Corp.		180,104		2,159,447
Northfield Bancorp, Inc.		74,887		1,210,174
Northwest Bancshares, Inc.		184,801		2,616,782
OceanFirst Financial Corp.		89,605		1,989,231
Premier Financial Corp.		55,468		1,714,516
Provident Bancorp, Inc.		32,679		607,829
Southern Missouri Bancorp, Inc.		12,070		629,692
Washington Federal, Inc.		98,218		3,278,517
Waterstone Financial, Inc.		33,179		725,293
WSFS Financial Corp.		72,072		3,612,249
				47,687,741
Beverage: Soft Drinks — 0.4%
Celsius Holdings, Inc.(a)		82,527		6,154,039
Coca-Cola Consolidated, Inc.		7,185		4,448,880
Duckhorn Portfolio, Inc.(a)		54,933		1,282,136
National Beverage Corp.		35,891		1,626,939
NewAge, Inc.(a)(b)		243,878		251,194
Primo Water Corp.		240,603		4,241,831
Zevia PBC, Class A(a)(b)		14,065		99,158
				18,104,177
Biotechnology — 8.2%
2seventy bio, Inc.(a)		34,034		872,291
4D Molecular Therapeutics, Inc.(a)		42,274		927,492
89bio, Inc.(a)(b)		12,295		160,696
9 Meters Biopharma, Inc.(a)		312,482		305,826
Acumen Pharmaceuticals, Inc.(a)		14,760		99,778
Adagio Therapeutics, Inc.(a)(b)		32,171		233,561
Adicet Bio, Inc.(a)		32,454		567,620
Aduro Biotech, Inc.(c)		21,953		65,859
Adverum Biotechnologies, Inc.(a)		136,226		239,758
Aeglea BioTherapeutics, Inc.(a)		71,346		338,894
Aerovate Therapeutics, Inc.(a)		11,232		132,425
Affimed NV(a)		178,550		985,596
Agenus, Inc.(a)		341,122		1,098,413
Agios Pharmaceuticals, Inc.(a)		82,856		2,723,477

76 2 0 2 1   BLACK ROCK   ANNUAL   REPORT   TO   SHAREHOLDERS

Schedule of Investments   (continued) December 31, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Biotechnology (continued)
Akebia Therapeutics, Inc.(a)		277,261	$	626,610
Akero Therapeutics, Inc.(a)		38,642		817,278
Akouos, Inc.(a)		36,026		306,221
Albireo Pharma, Inc.(a)		25,915		603,560
Aldeyra Therapeutics, Inc.(a)		73,079		292,316
Alector, Inc.(a)		89,457		1,847,287
Aligos Therapeutics, Inc.(a)(b)		36,306		430,952
Allakos, Inc.(a)(b)		54,307		531,666
Allogene Therapeutics, Inc.(a)		103,112		1,538,431
Allovir, Inc.(a)		44,294		573,164
Alpine Immune Sciences, Inc.(a)		25,129		348,037
Altimmune, Inc.(a)		61,429		562,690
ALX Oncology Holdings, Inc.(a)		26,983		579,865
Amicus Therapeutics, Inc.(a)(b)		403,125		4,656,094
AnaptysBio, Inc.(a)		29,368		1,020,538
Anavex Life Sciences Corp.(a)		102,609		1,779,240
ANI Pharmaceuticals, Inc.(a)		16,566		763,361
Annexon, Inc.(a)(b)		46,724		536,859
Apellis Pharmaceuticals, Inc.(a)		109,583		5,181,084
Applied Molecular Transport, Inc.(a)		37,144		519,273
Applied Therapeutics, Inc.(a)		33,159		296,773
Arbutus Biopharma Corp.(a)		118,224		459,891
Arcturus Therapeutics Holdings, Inc.(a)(b)		32,372		1,198,088
Arcus Biosciences, Inc.(a)(b)		68,699		2,780,249
Arcutis Biotherapeutics, Inc.(a)		43,527		902,750
Ardelyx, Inc.(a)(b)		152,253		167,478
Arena Pharmaceuticals, Inc.(a)		94,696		8,801,046
Arvinas, Inc.(a)		72,161		5,927,305
Atara Biotherapeutics, Inc.(a)		133,582		2,105,252
Athenex, Inc.(a)(b)		159,533		216,965
Athersys, Inc.(a)(b)		255,927		231,000
Atossa Therapeutics, Inc.(a)(b)		177,719		284,350
Atreca, Inc., Class A(a)(b)		45,165		136,850
Aura Biosciences, Inc.(a)		6,760		114,785
Avid Bioservices, Inc.(a)(b)		91,969		2,683,655
Avidity Biosciences, Inc.(a)		57,734		1,372,337
Avita Medical, Inc.(a)		35,610		426,608
Avrobio, Inc.(a)		52,376		201,648
Beam Therapeutics, Inc.(a)(b)		78,409		6,248,413
Beyondspring, Inc.(a)(b)		35,019		158,636
BioAtla, Inc.(a)		23,389		459,126
BioCryst Pharmaceuticals, Inc.(a)		275,710		3,818,583
BioDelivery Sciences International, Inc.(a)		139,121		431,275
Biohaven Pharmaceutical Holding Co. Ltd.(a)		85,319		11,757,811
Biomea Fusion, Inc.(a)		29,655		220,930
Bioventus, Inc., Class A(a)(b)		46,155		668,786
Bioxcel Therapeutics, Inc.(a)		25,925		527,055
Black Diamond Therapeutics, Inc.(a)		46,156		246,011
Bluebird Bio, Inc.(a)(b)		102,103		1,020,009
Blueprint Medicines Corp.(a)		89,734		9,611,409
Bolt Biotherapeutics, Inc.(a)(b)		35,008		171,539
Bridgebio Pharma, Inc.(a)		162,470		2,710,000
Brooklyn ImmunoTherapeutics, Inc.(a)		44,700		186,399
C4 Therapeutics, Inc.(a)		59,298		1,909,396
Cardiff Oncology, Inc.(a)		53,346		320,609
Caribou Biosciences, Inc.(a)		29,300		442,137
Castle Biosciences, Inc.(a)		33,145		1,420,926
Catalyst Pharmaceuticals, Inc.(a)		150,582		1,019,440
Celcuity, Inc.(a)		10,906		143,850
Celldex Therapeutics, Inc.(a)		70,437		2,721,686
CEL-SCI Corp.(a)		55,169		391,700
Century Therapeutics, Inc.(a)(b)		22,525		357,247
Cerevel Therapeutics Holdings, Inc.(a)		62,420		2,023,656

Security	Shares		Value
Biotechnology (continued)
ChemoCentryx, Inc.(a)		81,906	$	2,982,197
Chinook Therapeutics, Inc.(a)		58,543		954,836
Clene, Inc.(a)(b)		31,295		128,310
Clovis Oncology, Inc.(a)(b)		166,183		450,356
Codexis, Inc.(a)		91,580		2,863,707
Codiak Biosciences, Inc.(a)		22,710		252,989
Cogent Biosciences, Inc.(a)		54,386		466,632
Coherus Biosciences, Inc.(a)		101,091		1,613,412
Collegium Pharmaceutical, Inc.(a)		52,060		972,481
Contra GTX, Inc.(b)(c)		944		968
Cortexyme, Inc.(a)		30,019		378,840
Crinetics Pharmaceuticals, Inc.(a)		70,314		1,997,621
Cue Biopharma, Inc.(a)		46,824		529,579
Cullinan Oncology, Inc.(a)		39,446		608,652
Curis, Inc.(a)(b)		130,842		622,808
Cymabay Therapeutics, Inc.(a)		104,476		353,129
Cytokinetics, Inc.(a)		121,640		5,544,351
CytomX Therapeutics, Inc.(a)		111,108		481,098
CytoSorbents Corp.(a)		64,033		268,298
Day One Biopharmaceuticals, Inc.(a)		18,845		317,538
Deciphera Pharmaceuticals, Inc.(a)		62,795		613,507
Denali Therapeutics, Inc.(a)		139,410		6,217,686
Design Therapeutics, Inc.(a)(b)		38,869		832,185
Douglas Elliman, Inc.		109,704		1,261,596
Dynavax Technologies Corp.(a)		165,212		2,324,533
Dyne Therapeutics, Inc.(a)		44,808		532,767
Editas Medicine, Inc.(a)		105,523		2,801,636
Eiger Biopharmaceuticals, Inc.(a)		48,670		252,597
Eliem Therapeutics, Inc.(a)(b)		10,890		113,909
Emergent BioSolutions, Inc.(a)		74,869		3,254,555
Entrada Therapeutics, Inc.(a)(b)		12,531		214,531
Epizyme, Inc.(a)		137,866		344,665
Erasca, Inc.(a)(b)		30,012		467,587
Evelo Biosciences, Inc.(a)(b)		47,428		287,888
EyePoint Pharmaceuticals, Inc.(a)		32,802		401,496
Fate Therapeutics, Inc.(a)		124,526		7,286,016
FibroGen, Inc.(a)		133,924		1,888,328
Finch Therapeutics Group, Inc.(a)		13,935		138,932
Foghorn Therapeutics, Inc.(a)		32,469		742,566
Forma Therapeutics Holdings, Inc.(a)		52,861		751,683
Forte Biosciences, Inc.(a)(b)		16,626		35,580
Fortress Biotech, Inc.(a)		112,543		281,358
Frequency Therapeutics, Inc.(a)(b)		60,914		312,489
Fulcrum Therapeutics, Inc.(a)		41,003		725,343
G1 Therapeutics, Inc.(a)(b)		62,743		640,606
Gemini Therapeutics, Inc.(a)(b)		30,941		90,038
Generation Bio Co.(a)(b)		72,200		511,176
Geron Corp.(a)		436,582		532,630
Global Blood Therapeutics, Inc.(a)		95,649		2,799,646
Gossamer Bio, Inc.(a)		99,910		1,129,982
Graphite Bio, Inc.(a)		24,627		306,114
Greenwich Lifesciences, Inc.(a)		5,921		144,058
Gritstone bio, Inc.(a)		65,192		838,369
GT Biopharma, Inc.(a)		34,934		106,549
Halozyme Therapeutics, Inc.(a)		212,482		8,543,901
Harpoon Therapeutics, Inc.(a)		35,617		268,908
Harvard Bioscience, Inc.(a)		61,301		432,172
Heron Therapeutics, Inc.(a)(b)		142,674		1,302,614
Homology Medicines, Inc.(a)		66,601		242,428
Hookipa Pharma, Inc.(a)		22,901		53,359
Humanigen, Inc.(a)		67,653		251,669
iBio, Inc.(a)		316,447		173,729
Icosavax, Inc.(a)(b)		19,539		447,052

SERIES  SCHEDULE   OF  INVESTMENTS 77

Schedule of Investments   (continued) December 31, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Biotechnology (continued)
Ideaya Biosciences, Inc.(a)		50,300	$	1,189,092
IGM Biosciences, Inc.(a)		14,052		412,145
Imago Biosciences, Inc.(a)(b)		14,561		345,241
Immuneering Corp., Class A(a)(b)		12,353		199,748
Immunic, Inc.(a)		28,435		272,123
ImmunityBio, Inc.(a)(b)		101,128		614,858
ImmunoGen, Inc.(a)(b)		302,558		2,244,980
Immunovant, Inc.(a)		58,435		497,866
Impel Neuropharma, Inc.(a)(b)		10,369		89,484
Inhibrx, Inc.(a)(b)		42,656		1,862,788
Inovio Pharmaceuticals, Inc.(a)(b)		314,243		1,568,073
Inozyme Pharma, Inc.(a)		17,048		116,267
Insmed, Inc.(a)		181,119		4,933,682
Instil Bio, Inc.(a)(b)		83,593		1,430,276
Intellia Therapeutics, Inc.(a)(b)		106,783		12,626,022
Intercept Pharmaceuticals, Inc.(a)(b)		38,914		633,909
Invitae Corp.(a)(b)		305,417		4,663,718
iTeos Therapeutics, Inc.(a)		30,882		1,437,866
IVERIC bio, Inc.(a)		176,152		2,945,261
Janux Therapeutics, Inc.(a)(b)		24,304		479,518
Jounce Therapeutics, Inc.(a)		59,732		498,762
Kala Pharmaceuticals, Inc.(a)(b)		61,146		73,987
Kaleido Biosciences, Inc.(a)		19,163		45,800
KalVista Pharmaceuticals, Inc.(a)		33,923		448,801
Karuna Therapeutics, Inc.(a)		33,928		4,444,568
Karyopharm Therapeutics, Inc.(a)(b)		109,244		702,439
KemPharm, Inc.(a)(b)		42,902		373,676
Keros Therapeutics, Inc.(a)		23,575		1,379,373
Kezar Life Sciences, Inc.(a)		54,942		918,630
Kiniksa Pharmaceuticals Ltd., Class A(a)		44,646		525,483
Kinnate Biopharma, Inc.(a)		38,328		679,172
Kodiak Sciences, Inc.(a)		51,580		4,372,952
Kronos Bio, Inc.(a)(b)		58,058		789,008
Krystal Biotech, Inc.(a)		27,467		1,921,317
Kura Oncology, Inc.(a)		97,596		1,366,344
Kymera Therapeutics, Inc.(a)(b)		52,634		3,341,733
Lexicon Pharmaceuticals, Inc.(a)		102,558		404,079
Ligand Pharmaceuticals, Inc.(a)		23,084		3,565,555
Lineage Cell Therapeutics, Inc.(a)(b)		177,498		434,870
Lyell Immunopharma, Inc.(a)		35,757		276,759
MacroGenics, Inc.(a)		93,307		1,497,577
Madrigal Pharmaceuticals, Inc.(a)		18,136		1,536,845
Magenta Therapeutics, Inc.(a)		54,237		240,270
MannKind Corp.(a)(b)		377,716		1,650,619
Marinus Pharmaceuticals, Inc.(a)		55,784		662,714
MaxCyte, Inc.(a)		145,289		1,480,495
MeiraGTx Holdings plc(a)		45,301		1,075,446
Mersana Therapeutics, Inc.(a)		104,963		652,870
MiMedx Group, Inc.(a)		165,237		998,031
Mirum Pharmaceuticals, Inc.(a)		8,546		136,309
Molecular Templates, Inc.(a)		68,237		267,489
Monte Rosa Therapeutics, Inc.(a)		17,497		357,289
Morphic Holding, Inc.(a)		32,042		1,518,150
Mustang Bio, Inc.(a)		105,659		175,394
Myriad Genetics, Inc.(a)		121,562		3,355,111
Neoleukin Therapeutics, Inc.(a)		49,979		240,899
NexImmune, Inc.(a)(b)		8,158		37,608
NGM Biopharmaceuticals, Inc.(a)		49,964		884,862
Nkarta, Inc.(a)		22,072		338,805
Nurix Therapeutics, Inc.(a)		49,846		1,443,042
Nuvalent, Inc., Class A(a)		16,230		309,019
Ocugen, Inc.(a)(b)		278,977		1,269,345
Olema Pharmaceuticals, Inc.(a)		38,665		361,904

Security	Shares		Value
Biotechnology (continued)
Omega Therapeutics, Inc.(a)		9,752	$	110,490
Omeros Corp.(a)(b)		90,803		583,863
Oncocyte Corp.(a)		110,088		238,891
Oncorus, Inc.(a)		30,013		158,169
Oncternal Therapeutics, Inc.(a)		65,934		149,670
OPKO Health, Inc.(a)(b)		605,169		2,910,863
ORIC Pharmaceuticals, Inc.(a)		48,221		708,849
Outlook Therapeutics, Inc.(a)(b)		125,636		170,865
Oyster Point Pharma, Inc.(a)(b)		21,266		388,317
Pacific Biosciences of California, Inc.(a)(b)		297,677		6,090,471
Passage Bio, Inc.(a)		59,966		380,784
Personalis, Inc.(a)		54,190		773,291
Phathom Pharmaceuticals, Inc.(a)		30,061		591,300
PMV Pharmaceuticals, Inc.(a)		39,497		912,381
Portage Biotech, Inc.(a)		6,706		71,955
Poseida Therapeutics, Inc.(a)		48,124		327,724
Praxis Precision Medicines, Inc.(a)		49,737		979,819
Precigen, Inc.(a)		144,839		537,353
Precision BioSciences, Inc.(a)(b)		77,298		572,005
Prelude Therapeutics, Inc.(a)(b)		14,971		186,389
Prometheus Biosciences, Inc.(a)(b)		45,801		1,810,972
Protagonist Therapeutics, Inc.(a)		68,775		2,352,105
Prothena Corp. PLC(a)		55,442		2,738,835
Provention Bio, Inc.(a)(b)		80,450		452,129
PTC Therapeutics, Inc.(a)(b)		105,581		4,205,291
Pulse Biosciences, Inc.(a)		21,148		313,202
Puma Biotechnology, Inc.(a)		47,281		143,734
Pyxis Oncology, Inc.(a)		15,394		168,872
RadNet, Inc.(a)		71,625		2,156,629
Rallybio Corp.(a)		4,500		42,930
Rapt Therapeutics, Inc.(a)		32,957		1,210,511
Recursion Pharmaceuticals, Inc., Class A(a)		176,629		3,025,655
REGENXBIO, Inc.(a)		59,760		1,954,152
Relay Therapeutics, Inc.(a)		107,404		3,298,377
Relmada Therapeutics, Inc.(a)		22,508		507,105
Replimune Group, Inc.(a)		47,471		1,286,464
Revolution Medicines, Inc.(a)(b)		89,866		2,261,927
Rhythm Pharmaceuticals, Inc.(a)		67,808		676,724
Rigel Pharmaceuticals, Inc.(a)		256,348		679,322
Rocket Pharmaceuticals, Inc.(a)(b)		63,341		1,382,734
Rubius Therapeutics, Inc.(a)		68,336		661,492
Sana Biotechnology, Inc.(a)(b)		131,093		2,029,320
Sangamo Therapeutics, Inc.(a)		182,613		1,369,598
Scholar Rock Holding Corp.(a)(b)		42,334		1,051,577
Selecta Biosciences, Inc.(a)		154,589		503,960
Sensei Biotherapeutics, Inc.(a)		33,652		195,182
Seres Therapeutics, Inc.(a)		105,148		875,883
Sesen Bio, Inc.(a)(b)		303,015		246,957
Shattuck Labs, Inc.(a)		39,554		336,605
Sigilon Therapeutics, Inc.(a)		10,362		28,599
Silverback Therapeutics, Inc.(a)(b)		32,599		217,109
Singular Genomics Systems, Inc.(a)		19,168		221,582
Solid Biosciences, Inc.(a)		103,306		180,786
Sorrento Therapeutics, Inc.(a)(b)		453,020		2,106,543
Spero Therapeutics, Inc.(a)(b)		36,207		579,674
SpringWorks Therapeutics, Inc.(a)		44,774		2,775,093
Spruce Biosciences, Inc.(a)(b)		9,625		42,928
SQZ Biotechnologies Co.(a)		33,371		298,003
Stoke Therapeutics, Inc.(a)		28,614		686,450
Summit Therapeutics, Inc.(a)		34,667		93,254
Surface Oncology, Inc.(a)		50,001		239,005
Sutro Biopharma, Inc.(a)		65,442		973,777
Syros Pharmaceuticals, Inc.(a)		112,522		366,822

78 2 0 2 1   BLACK ROCK   ANNUAL   REPORT   TO   SHAREHOLDERS

Schedule of Investments   (continued) December 31, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Biotechnology (continued)
Talaris Therapeutics, Inc.(a)		32,454	$	496,222
Taysha Gene Therapies, Inc.(a)(b)		32,800		382,120
TCR2 Therapeutics, Inc.(a)		43,536		202,878
Tenaya Therapeutics, Inc.(a)		21,583		408,998
Travere Therapeutics, Inc.(a)		90,084		2,796,207
Trevena, Inc.(a)(b)		237,659		138,436
Turning Point Therapeutics, Inc.(a)		70,544		3,364,949
Twist Bioscience Corp.(a)(b)		72,404		5,603,346
Tyra Biosciences, Inc.(a)(b)		16,362		230,213
UroGen Pharma Ltd.(a)(b)		29,912		284,463
Vanda Pharmaceuticals, Inc.(a)		84,079		1,319,200
Vaxart, Inc.(a)(b)		187,570		1,176,064
Vaxcyte, Inc.(a)		61,780		1,469,746
VBI Vaccines, Inc.(a)		276,911		647,972
Vera Therapeutics, Inc.(a)		15,094		403,312
Veracyte, Inc.(a)		104,018		4,285,542
Verastem, Inc.(a)		257,792		528,474
Vericel Corp.(a)(b)		71,237		2,799,614
Verrica Pharmaceuticals, Inc.(a)(b)		21,272		194,852
Verve Therapeutics, Inc.(a)(b)		24,058		887,018
Viking Therapeutics, Inc.(a)		101,263		465,810
Vincerx Pharma, Inc.(a)(b)		22,974		234,105
Vir Biotechnology, Inc.(a)		91,938		3,849,444
Viracta Therapeutics, Inc.(a)		53,640		195,786
VistaGen Therapeutics, Inc.(a)		281,092		548,129
Vor BioPharma, Inc.(a)(b)		29,060		337,677
Werewolf Therapeutics, Inc.(a)(b)		37,944		451,913
XBiotech, Inc.		21,897		243,714
Xencor, Inc.(a)		86,873		3,485,345
Xilio Therapeutics, Inc.(a)		12,495		199,920
XOMA Corp.(a)(b)		9,810		204,539
Y-mAbs Therapeutics, Inc.(a)		53,449		866,408
Zentalis Pharmaceuticals, Inc.(a)		55,809		4,691,305
ZIOPHARM Oncology, Inc.(a)(b)		326,456		355,837
				375,203,300
Building Materials — 0.8%
Aspen Aerogels, Inc.(a)		33,994		1,692,561
BlueLinx Holdings, Inc.(a)		14,233		1,362,952
Caesarstone Ltd.		34,219		388,044
Cornerstone Building Brands, Inc.(a)		83,579		1,457,618
Gibraltar Industries, Inc.(a)		50,132		3,342,802
Griffon Corp.		69,919		1,991,293
Masonite International Corp.(a)		36,515		4,306,944
Patrick Industries, Inc.		34,860		2,812,853
PGT Innovations, Inc.(a)		87,158		1,960,184
Quanex Building Products Corp.		49,618		1,229,534
Simpson Manufacturing Co., Inc.		66,740		9,281,532
Summit Materials, Inc., Class A(a)(b)		182,110		7,309,895
				37,136,212
Building: Climate Control — 0.3%
AAON, Inc.		64,111		5,092,337
Comfort Systems USA, Inc.		54,665		5,408,555
View, Inc.(a)(b)		207,380		810,856
				11,311,748
Building: Roofing, Wallboard & Plumbing(a) — 0.2%
Beacon Roofing Supply, Inc.		85,554		4,906,522
Forterra, Inc.		43,495		1,034,311
JELD-WEN Holding, Inc.(b)		140,474		3,702,895
				9,643,728

Security	Shares		Value
Cable Television Services(a) — 0.1%
AMC Networks, Inc., Class A(b)		44,617	$	1,536,609
Liberty Latin America Ltd., Class A		87,902		1,024,937
Liberty Latin America Ltd., Class C		212,722		2,425,031
WideOpenWest, Inc.		80,336		1,728,831
				6,715,408
Casinos & Gambling — 0.4%
Accel Entertainment, Inc.(a)		86,055		1,120,436
Century Casinos, Inc.(a)		41,366		503,838
Full House Resorts, Inc.(a)		47,443		574,535
Golden Nugget Online Gaming, Inc.(a)		61,035		607,298
International Game Technology PLC		153,061		4,424,993
Monarch Casino & Resort, Inc.(a)		20,052		1,482,845
Scientific Games Corp., Class A(a)		147,220		9,838,713
				18,552,658
Cement — 0.0%
Concrete Pumping Holdings, Inc.(a)		40,542		332,444
Chemicals: Diversified — 0.8%
AdvanSix, Inc.		41,573		1,964,324
American Vanguard Corp.		45,118		739,484
Avient Corp.		139,695		7,815,935
Cabot Corp.		86,327		4,851,578
CSW Industrials, Inc.		22,663		2,739,050
Danimer Scientific, Inc.(a)(b)		137,072		1,167,854
Ecovyst, Inc.		78,142		800,174
GCP Applied Technologies, Inc.(a)		75,230		2,381,782
Hawkins, Inc.		29,814		1,176,162
Ingevity Corp.(a)		61,102		4,381,013
Landec Corp.(a)		42,588		472,727
Marrone Bio Innovations, Inc.(a)(b)		93,408		67,273
PureCycle Technologies, Inc.(a)		80,001		765,610
Rayonier Advanced Materials, Inc.(a)		91,699		523,601
Sensient Technologies Corp.		64,905		6,494,394
Valhi, Inc.		1,656		47,610
Zymergen, Inc.(a)		119,999		802,793
				37,191,364
Chemicals: Specialty — 0.9%
Amyris, Inc.(a)(b)		273,295		1,478,526
Balchem Corp.		49,341		8,318,892
FutureFuel Corp.		39,115		298,838
Innospec, Inc.		37,582		3,395,158
Kraton Corp.(a)		47,918		2,219,562
Livent Corp.(a)		248,171		6,050,409
Orion Engineered Carbons SA(a)		92,002		1,689,157
Park Aerospace Corp.		31,735		418,902
Quaker Chemical Corp.		20,726		4,783,146
Stepan Co.		33,182		4,124,191
Trinseo PLC		59,656		3,129,554
Tronox Holdings PLC, Class A		176,558		4,242,689
				40,149,024
Coal — 0.2%
Arch Resources, Inc.		23,277		2,125,656
CONSOL Energy, Inc.(a)(b)		52,488		1,192,002
Peabody Energy Corp.(a)		140,332		1,413,143
Warrior Met Coal, Inc.		79,131		2,034,458
				6,765,259

SERIES  SCHEDULE   OF  INVESTMENTS 79

Schedule of Investments   (continued) December 31, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Commercial Banks — 0.1%
Dime Community Bancshares, Inc.		53,787	$	1,891,151
HomeTrust Bancshares, Inc.		24,560		760,869
				2,652,020
Commercial Finance & Mortgage Companies — 0.4%
Federal Agricultural Mortgage Corp., Class C		13,758		1,705,029
Meta Financial Group, Inc.		44,548		2,657,734
Ocwen Financial Corp.(a)(b)		12,838		513,135
PennyMac Financial Services, Inc.		47,991		3,348,812
RE/MAX Holdings, Inc., Class A		28,201		859,848
Velocity Financial Inc.(a)(b)		17,616		241,339
Walker & Dunlop, Inc.		44,593		6,728,192
				16,054,089
Commercial Services & Supplies — 0.0%
Aris Water Solution, Inc.(a)		26,865		347,902
National Research Corp.		20,953		869,968
				1,217,870
Commercial Services: Rental & Leasing — 0.6%
GATX Corp.		53,958		5,621,884
GMS, Inc.(a)		65,608		3,943,697
H&E Equipment Services, Inc.		48,832		2,161,793
Herc Holdings, Inc.		38,179		5,976,922
Marlin Business Services Corp.		12,216		284,388
McGrath RentCorp		36,892		2,960,952
NOW, Inc.(a)		167,068		1,426,761
Rush Enterprises, Inc., Class B		10,246		552,977
Triton International Ltd.		102,226		6,157,072
Willis Lease Finance Corp.(a)		4,940		185,991
				29,272,437
Commercial Vehicles & Parts — 0.3%
Blue Bird Corp.(a)(b)		22,856		357,468
Commercial Vehicle Group, Inc.(a)(b)		48,409		390,177
Cooper-Standard Holdings, Inc.(a)		25,764		577,371
Miller Industries, Inc.		17,235		575,649
Modine Manufacturing Co.(a)		83,369		841,193
Motorcar Parts of America, Inc.(a)		27,475		468,998
REV Group, Inc.		43,602		616,969
Rush Enterprises, Inc., Class A		64,016		3,561,850
Shyft Group, Inc.		52,875		2,597,749
Wabash National Corp.		73,987		1,444,226
				11,431,650
Communications Technology — 0.9%
908 Devices, Inc.(a)(d)		28,929		748,393
ADTRAN, Inc.		72,278		1,650,107
Anterix, Inc.(a)		17,633		1,036,115
Avaya Holdings Corp.(a)(b)		124,977		2,474,545
Aviat Networks, Inc.(a)		10,089		323,655
Bandwidth, Inc., Class A(a)		35,537		2,550,135
Calix, Inc.(a)		84,373		6,747,309
Casa Systems, Inc.(a)		46,447		263,355
Comtech Telecommunications Corp.		39,454		934,665
Digi International, Inc.(a)		50,826		1,248,795
DZS, Inc.(a)		31,355		508,578
EchoStar Corp., Class A(a)		56,163		1,479,895
Extreme Networks, Inc.(a)		194,529		3,054,105
Harmonic, Inc.(a)(b)		143,427		1,686,702
Infinera Corp.(a)(b)		279,719		2,682,505
Inseego Corp.(a)(b)		129,668		755,964
InterDigital, Inc.		47,093		3,373,272
KVH Industries, Inc.(a)		27,118		249,214

Security	Shares		Value
Communications Technology (continued)
Maxar Technologies, Inc.(b)		111,071	$	3,279,927
NeoPhotonics Corp.(a)		78,517		1,206,806
NETGEAR, Inc.(a)		45,468		1,328,120
Ooma, Inc.(a)		33,106		676,687
Plantronics, Inc.(a)		63,846		1,873,242
Ribbon Communications, Inc.(a)		123,523		747,314
				40,879,405
Computer Services Software & Systems — 7.1%
A10 Networks, Inc.		89,959		1,491,520
ACI Worldwide, Inc.(a)		180,809		6,274,072
Alarm.com Holdings, Inc.(a)(b)		72,237		6,126,420
Alkami Technology, Inc.(a)(b)		42,030		843,122
Altair Engineering, Inc., Class A(a)(b)		71,501		5,528,457
American Software, Inc., Class A		47,528		1,243,808
Appfolio, Inc., Class A(a)		29,323		3,549,842
Appian Corp.(a)		60,302		3,932,293
Asana, Inc., Class A(a)(b)		109,045		8,129,305
Aterian, Inc.(a)(b)		44,027		180,951
Avid Technology, Inc.(a)		55,839		1,818,676
Benefitfocus, Inc.(a)		41,692		444,437
BigCommerce Holdings, Inc., Series-1(a)		74,168		2,623,322
Blackbaud, Inc.(a)		73,159		5,778,098
Blackline, Inc.(a)		83,110		8,605,209
Blucora, Inc.(a)		74,016		1,281,957
Bottomline Technologies DE, Inc.(a)		68,661		3,877,287
Box, Inc., Class A(a)		213,836		5,600,365
Brightcove, Inc.(a)		60,050		613,711
BTRS Holdings, Inc.(a)		97,883		765,445
Cargurus, Inc.(a)(b)		146,182		4,917,562
Cerence, Inc.(a)(b)		57,986		4,444,047
Cleanspark, Inc.(a)		53,633		510,586
CommVault Systems, Inc.(a)		70,090		4,830,603
ComScore, Inc.(a)(b)		128,700		429,858
CoreCard Corp.(a)		11,424		443,251
Covetrus, Inc.(a)		159,416		3,183,537
CSG Systems International, Inc.		49,745		2,866,307
DarioHealth Corp.(a)(b)		19,922		258,388
Digimarc Corp.(a)(b)		20,994		828,843
Digital Turbine, Inc.(a)		139,017		8,478,647
DigitalOcean Holdings, Inc.(a)		77,701		6,241,721
Domo, Inc., Class B(a)		43,274		2,146,390
E2open Parent Holdings, Inc.(a)(b)		304,627		3,430,100
Ebix, Inc.		40,048		1,217,459
Envestnet, Inc.(a)		83,050		6,589,187
ePlus, Inc.(a)		40,828		2,199,813
Eventbrite, Inc., Class A(a)(b)		120,750		2,105,880
EverQuote, Inc., Class A(a)		28,951		453,373
Evolent Health, Inc., Class A(a)		121,994		3,375,574
fuboTV, Inc.(a)(b)		208,197		3,231,217
GAN Ltd.(a)(b)		60,822		558,954
Grid Dynamics Holdings, Inc.(a)		69,630		2,643,851
Groupon, Inc.(a)(b)		38,791		898,400
GTY Technology Holdings, Inc.(a)(b)		47,244		316,535
HyreCar, Inc.(a)(b)		26,547		125,036
Ideanomics, Inc.(a)(b)		669,102		802,922
JFrog Ltd.(a)(b)		82,508		2,450,488
Limelight Networks, Inc.(a)		191,256		656,008
LivePerson, Inc.(a)(b)		100,848		3,602,291
LiveRamp Holdings, Inc.(a)		101,174		4,851,293
Magnite, Inc.(a)(b)		197,424		3,454,920
ManTech International Corp., Class A		42,003		3,063,279

80 2 0 2 1   BLACK ROCK   ANNUAL   REPORT   TO   SHAREHOLDERS

Schedule of Investments   (continued) December 31, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Computer Services Software & Systems (continued)
Marathon Digital Holdings, Inc.(a)(b)		146,118	$	4,801,437
MicroStrategy, Inc., Class A(a)(b)		12,963		7,058,224
Mimecast Ltd.(a)		93,269		7,421,414
Mitek Systems, Inc.(a)		64,044		1,136,781
Momentive Global, Inc.(a)		197,779		4,183,026
Multiplan Corp.(a)		585,556		2,594,013
NetScout Systems, Inc.(a)		107,219		3,546,804
ON24, Inc.(a)		40,833		708,453
OneSpan, Inc.(a)		56,990		964,841
Ouster, Inc.(a)(b)		241,544		1,256,029
PagerDuty, Inc.(a)(b)		125,743		4,369,569
PAR Technology Corp.(a)(b)		38,384		2,025,524
Parsons Corp.(a)(b)		40,667		1,368,445
Paya Holdings, Inc.(a)(b)		130,042		824,466
PDF Solutions, Inc.(a)		47,692		1,516,129
Perficient, Inc.(a)		49,889		6,450,149
Ping Identity Holding Corp.(a)		93,245		2,133,446
Progress Software Corp.		67,570		3,261,604
PROS Holdings, Inc.(a)		61,030		2,104,925
Q2 Holdings, Inc.(a)(b)		83,754		6,653,418
Rackspace Technology, Inc.(a)		83,603		1,126,132
Rapid7, Inc.(a)(b)		85,998		10,121,105
Rimini Street, Inc.(a)		67,974		405,805
Riot Blockchain, Inc.(a)(b)		136,190		3,041,123
SailPoint Technologies Holding, Inc.(a)		140,108		6,772,821
Sapiens International Corp. NV		47,514		1,636,857
Schrodinger, Inc.(a)		68,985		2,402,748
SecureWorks Corp., Class A(a)		13,813		220,594
ShotSpotter, Inc.(a)		12,012		354,594
Shutterstock, Inc.		35,613		3,948,769
Simulations Plus, Inc.		23,257		1,100,056
Smith Micro Software, Inc.(a)		68,015		334,634
Sprout Social, Inc., Class A(a)		69,123		6,268,765
SPS Commerce, Inc.(a)		55,096		7,842,916
Sumo Logic, Inc.(a)(b)		135,020		1,830,871
TechTarget, Inc.(a)		39,934		3,820,086
Telos Corp.(a)		60,834		938,060
Tenable Holdings, Inc.(a)		141,247		7,778,472
Tucows, Inc., Class A(a)(b)		14,386		1,205,835
Unisys Corp.(a)		100,338		2,063,953
Upland Software, Inc.(a)		45,169		810,332
Upwork, Inc.(a)		180,263		6,157,784
Varonis Systems, Inc.(a)		164,523		8,025,432
Verint Systems, Inc.(a)(b)		98,719		5,183,735
Veritone, Inc.(a)		43,131		969,585
Verra Mobility Corp.(a)		220,116		3,396,390
Viant Technology, Inc., Class A(a)		18,892		183,347
VirnetX Holding Corp.(a)		96,165		250,029
Workiva, Inc.(a)		65,456		8,541,353
Yelp, Inc.(a)		109,618		3,972,556
Yext, Inc.(a)(b)		170,035		1,686,747
Zuora, Inc., Class A(a)(b)		170,041		3,176,366
				324,261,166
Computer Technology — 0.8%
3D Systems Corp.(a)		190,090		4,094,539
Cantaloupe, Inc.(a)		85,825		762,126
Corsair Gaming, Inc.(a)(b)		41,270		867,083
Diebold Nixdorf, Inc.(a)		118,421		1,071,710
Identiv, Inc.(a)		36,399		1,024,268
Impinj, Inc.(a)		28,793		2,553,939

Security	Shares		Value
Computer Technology (continued)
Insight Enterprises, Inc.(a)		52,559	$	5,602,789
PC Connection, Inc.		16,720		721,134
Quantum Corp.(a)		90,596		500,090
Super Micro Computer, Inc.(a)		66,714		2,932,080
Synaptics, Inc.(a)		59,946		17,354,966
				37,484,724
Construction — 0.4%
Construction Partners, Inc., Class A(a)		44,683		1,314,127
EMCOR Group, Inc.		81,858		10,427,891
Granite Construction, Inc.		70,185		2,716,159
Great Lakes Dredge & Dock Corp.(a)		96,393		1,515,298
Innovate Corp.(a)(b)		77,220		285,714
Primoris Services Corp.		81,337		1,950,461
Sterling Construction Co., Inc.(a)		41,720		1,097,236
Tutor Perini Corp.(a)		62,081		767,942
				20,074,828
Consumer Electronics(a) — 0.2%
Sonos, Inc.		184,224		5,489,875
Universal Electronics, Inc.		20,123		820,012
VOXX International Corp.		30,284		307,988
Vuzix Corp.(b)		88,923		770,963
				7,388,838
Consumer Lending — 0.7%
Curo Group Holdings Corp.		32,093		513,809
Encore Capital Group, Inc.(a)(b)		44,587		2,769,298
Enova International, Inc.(a)(b)		55,026		2,253,865
Ezcorp, Inc., Class A(a)		71,050		523,638
LendingTree, Inc.(a)		17,681		2,167,691
Marcus & Millichap, Inc.(a)		35,893		1,847,054
MoneyGram International, Inc.(a)		135,919		1,072,401
Navient Corp.		241,904		5,133,203
Nelnet, Inc., Class A		26,260		2,565,077
Oportun Financial Corp.(a)		30,188		611,307
PRA Group, Inc.(a)(b)		65,675		3,297,542
PROG Holdings, Inc.(a)		99,718		4,498,279
Regional Management Corp.		12,891		740,717
World Acceptance Corp.(a)(b)		6,745		1,655,425
				29,649,306
Consumer Services: Miscellaneous — 0.3%
Cars.com, Inc.(a)		103,348		1,662,869
Chuy’s Holdings, Inc.(a)		30,052		905,166
FirstCash Holdings, Inc.		61,033		4,565,879
Franchise Group, Inc.		43,571		2,272,664
KAR Auction Services, Inc.(a)		184,992		2,889,575
Udemy, Inc.(a)(b)		19,831		387,498
WW International, Inc.(a)(b)		83,641		1,349,129
				14,032,780
Containers & Packaging — 0.3%
Greif, Inc., Class A		38,555		2,327,565
Greif, Inc., Class B		10,120		604,974
Myers Industries, Inc.		53,403		1,068,594
O-I Glass, Inc.(a)		243,024		2,923,579
Pactiv Evergreen, Inc.		71,171		902,448
Ranpak Holdings Corp.(a)		57,281		2,152,620
UFP Technologies, Inc.(a)		11,366		798,575
Veritiv Corp.(a)		21,928		2,687,715
				13,466,070

SERIES  SCHEDULE   OF  INVESTMENTS 81

Schedule of Investments   (continued) December 31, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Cosmetics — 0.1%
elf Beauty, Inc.(a)		73,849	$	2,452,525
Inter Parfums, Inc.		27,159		2,903,297
Revlon, Inc., Class A(a)		11,949		135,502
				5,491,324
Diversified Financial Services — 0.7%
Alerus Financial Corp.		21,917		641,730
Associated Capital Group, Inc., Class A		3,113		133,859
Cannae Holdings, Inc.(a)		130,054		4,571,398
European Wax Center, Inc., Class A(a)(b)		19,489		591,491
Greenhill & Co., Inc.		22,224		398,476
Hannon Armstrong Sustainable Infrastructure Capital, Inc.		117,560		6,244,787
Houlihan Lokey, Inc.		78,265		8,101,993
MBIA, Inc.(a)(b)		76,509		1,208,077
MidWestOne Financial Group, Inc.		23,793		770,180
Moelis & Co., Class A		93,741		5,859,750
Piper Sandler Cos		26,738		4,773,000
StoneMor, Inc.(a)		58,858		134,196
Tiptree, Inc.		37,480		518,349
				33,947,286
Diversified Manufacturing Operations — 0.5%
Barnes Group, Inc.		72,670		3,385,695
Custom Truck One Source, Inc.(a)(b)		69,317		554,536
Enerpac Tool Group Corp.		91,998		1,865,719
Federal Signal Corp.		92,507		4,009,253
Harsco Corp.(a)		120,328		2,010,681
Luxfer Holdings PLC		41,578		802,871
OSI Systems, Inc.(a)		26,193		2,441,188
PowerSchool Holdings, Inc., Class A(a)		82,665		1,361,493
Standex International Corp.		18,771		2,077,199
TriMas Corp.		66,474		2,459,538
				20,968,173
Diversified Materials & Processing — 0.3%
Belden, Inc.(b)		67,719		4,451,170
Encore Wire Corp.		30,164		4,316,468
Insteel Industries, Inc.		28,902		1,150,589
Koppers Holdings, Inc.(a)		31,212		976,936
NL Industries, Inc.		9,941		73,563
Tredegar Corp.		40,253		475,790
Uranium Energy Corp.(a)		390,842		1,309,321
				12,753,837
Diversified Media — 0.0%
EW Scripps Co., Class A		87,591		1,694,886
Hemisphere Media Group, Inc.(a)		26,455		192,328
				1,887,214
Diversified Retail — 1.0%
Big Lots, Inc.		49,529		2,231,281
BJ’s Wholesale Club Holdings, Inc.(a)(b)		209,641		14,039,658
Dillard’s, Inc., Class A		8,929		2,187,784
Duluth Holdings, Inc., Class B(a)(b)		17,500		265,650
Global Industrial Co.		19,080		780,372
Macy’s, Inc.		481,066		12,594,308
Overstock.com, Inc.(a)		65,835		3,884,923
Porch Group, Inc.(a)		117,922		1,838,404
PriceSmart, Inc.		36,353		2,659,949
Revolve Group, Inc.(a)(b)		54,999		3,082,144

Security	Shares		Value
Diversified Retail (continued)
Stitch Fix, Inc., Class A(a)		125,386	$	2,372,303
Winmark Corp.		5,226		1,297,564
				47,234,340
Drug & Grocery Store Chains — 0.2%
Ingles Markets, Inc., Class A		21,431		1,850,352
PetMed Express, Inc.		31,341		791,674
Rite Aid Corp.(a)		86,181		1,265,999
Sprouts Farmers Market, Inc.(a)		172,382		5,116,298
Village Super Market, Inc., Class A		13,818		323,203
Weis Markets, Inc.		25,358		1,670,585
				11,018,111
Education Services — 0.5%
2U, Inc.(a)		111,499		2,237,785
Adtalem Global Education, Inc.(a)		75,850		2,242,126
American Public Education, Inc.(a)		30,013		667,789
Coursera, Inc.(a)		112,131		2,740,482
Franklin Covey Co.(a)		19,637		910,371
Graham Holdings Co., Class B		5,812		3,660,572
HealthStream, Inc.(a)		37,902		999,097
Houghton Mifflin Harcourt Co.(a)		195,413		3,146,149
Laureate Education, Inc., Class A		152,071		1,861,349
Perdoceo Education Corp.(a)		105,907		1,245,466
Strategic Education, Inc.		37,320		2,158,589
Stride, Inc.(a)		63,284		2,109,256
				23,979,031
Electronic Components — 0.8%
Acacia Research Corp.(a)		73,479		376,947
American Superconductor Corp.(a)		40,149		436,821
Array Technologies, Inc.(a)(b)		195,805		3,072,180
Eos Energy Enterprises, Inc.(a)		69,490		522,565
Methode Electronics, Inc.		59,022		2,902,112
MicroVision, Inc.(a)(b)		251,799		1,261,513
Novanta, Inc.(a)		53,938		9,510,888
NVE Corp.		7,682		524,681
Rogers Corp.(a)		28,684		7,830,732
Sanmina Corp.(a)		96,828		4,014,489
ScanSource, Inc.(a)		38,392		1,346,791
Stem, Inc.(a)		174,733		3,314,685
TTM Technologies, Inc.(a)		161,307		2,403,474
Velodyne Lidar, Inc.(a)(b)		116,349		539,859
				38,057,737
Electronic Entertainment — 0.0%
PlayAGS, Inc.(a)		39,489		268,130
Turtle Beach Corp.(a)		23,215		516,766
Via Renewables, Inc.		18,805		214,941
				999,837
Electronics(a) — 0.5%
Agilysys, Inc.		32,091		1,426,766
Daktronics, Inc.		60,802		307,050
II-VI, Inc.(b)		162,282		11,088,729
Integer Holdings Corp.		50,207		4,297,217
iRobot Corp.(b)		40,703		2,681,514
Iteris, Inc.		65,743		262,972
nLight, Inc.(b)		66,595		1,594,950
				21,659,198
Energy Equipment — 0.7%
API Group Corp.(a)(e)		308,931		7,961,152
Arcosa, Inc.		74,559		3,929,259

82 2 0 2 1   BLACK ROCK   ANNUAL   REPORT   TO   SHAREHOLDERS

Schedule of Investments   (continued) December 31, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Energy Equipment (continued)
Beam Global(a)(b)		13,184	$	245,222
Bloom Energy Corp., Class A(a)		217,917		4,778,920
Expro Group Holdings NV(a)		72,447		1,039,615
FuelCell Energy, Inc.(a)(b)		567,150		2,949,180
Matador Resources Co.		168,796		6,231,948
SunPower Corp.(a)(b)		122,477		2,556,095
TPI Composites, Inc.(a)		54,901		821,319
				30,512,710
Engineering & Contracting Services — 1.1%
Argan, Inc.		22,506		870,757
Dycom Industries, Inc.(a)(b)		45,071		4,225,857
Exponent, Inc.		79,481		9,277,817
Fluor Corp.(a)		217,727		5,393,098
IES Holdings, Inc.(a)		12,597		637,912
KBR, Inc.		216,606		10,314,778
Mistras Group, Inc.(a)		27,467		204,080
MYR Group, Inc.(a)		25,004		2,764,192
NETSTREIT Corp.		59,568		1,364,107
Tetra Tech, Inc.		82,588		14,023,442
VSE Corp.		17,038		1,038,296
Willdan Group, Inc.(a)		16,539		582,173
				50,696,509
Entertainment(a) — 0.7%
AMC Entertainment Holdings, Inc., Class A(b)		790,106		21,490,883
Chicken Soup For The Soul Entertainment, Inc.		10,364		143,438
Cinemark Holdings, Inc.		165,507		2,667,973
CuriosityStream, Inc.		38,908		230,724
Golden Entertainment, Inc.		25,903		1,308,878
IMAX Corp.		75,894		1,353,949
Lions Gate Entertainment Corp., Class A(b)		101,470		1,688,461
Lions Gate Entertainment Corp., Class B		167,979		2,585,197
				31,469,503
Environmental, Maintenance, & Security Service — 0.5%
ABM Industries, Inc.		103,681		4,235,369
BrightView Holdings, Inc.(a)		60,499		851,826
Brink’s Co.		74,063		4,856,311
Healthcare Services Group, Inc.		114,242		2,032,365
IBEX Holdings Ltd.(a)		10,191		131,362
Montrose Environmental Group, Inc.(a)		39,987		2,819,483
SP Plus Corp.(a)		34,800		982,056
UniFirst Corp.		23,116		4,863,607
Vivint Smart Home, Inc.(a)		139,486		1,364,173
				22,136,552
Financial Data & Systems — 0.5%
Atlanticus Holdings Corp.(a)		7,396		527,483
Cass Information Systems, Inc.		22,211		873,337
Donnelley Financial Solutions, Inc.(a)		44,696		2,106,969
Everi Holdings, Inc.(a)		132,475		2,828,341
EVERTEC, Inc.		92,630		4,629,647
Evo Payments, Inc., Class A(a)		71,609		1,833,190
Green Dot Corp., Class A(a)		80,675		2,923,662
GreenBox POS(a)(b)		25,085		105,357
I3 Verticals, Inc., Class A(a)		35,711		813,854
International Money Express, Inc.(a)		48,440		773,102
LendingClub Corp.(a)		151,758		3,669,509
Priority Technology Holdings, Inc.(a)		9,786		69,285
Repay Holdings Corp.(a)(b)		131,837		2,408,662
Value Line, Inc.		1,578		73,882
				23,636,280

Security	Shares		Value
Food & Staples Retailing — 0.0%
Natural Grocers by Vitamin Cottage, Inc.		14,822	$	211,214
Foods — 1.3%
AppHarvest, Inc.(a)		106,445		414,071
B&G Foods, Inc.		98,417		3,024,354
BellRing Brands, Inc., Class A(a)		60,091		1,714,396
Chefs’ Warehouse, Inc.(a)		48,326		1,609,256
HF Foods Group, Inc.(a)		54,160		458,194
Hostess Brands, Inc.(a)		210,468		4,297,756
J&J Snack Foods Corp.		22,736		3,591,379
John B Sanfilippo & Son, Inc.		13,010		1,172,982
Laird Superfood, Inc.(a)(b)		11,995		156,415
Lancaster Colony Corp.		29,065		4,813,164
Medifast, Inc.		17,607		3,687,434
Mission Produce, Inc.(a)		53,823		845,021
Nature’s Sunshine Products, Inc.		21,667		400,839
Performance Food Group Co.(a)(b)		232,667		10,677,089
Seneca Foods Corp., Class A(a)		10,032		481,034
Simply Good Foods Co.(a)		130,580		5,428,211
Sovos Brands, Inc.(a)(b)		36,975		556,474
SpartanNash Co.		55,087		1,419,041
Tattooed Chef, Inc.(a)(b)		72,463		1,126,075
Tootsie Roll Industries, Inc.		24,156		875,172
TreeHouse Foods, Inc.(a)		79,504		3,222,297
United Natural Foods, Inc.(a)		84,930		4,168,364
Utz Brands, Inc.(b)		90,489		1,443,299
Vita Coco Co., Inc.(a)		13,927		155,565
Vital Farms, Inc.(a)(b)		37,935		685,106
Whole Earth Brands, Inc.(a)		54,847		589,057
				57,012,045
Forest Products — 0.3%
Boise Cascade Co.		60,609		4,315,361
UFP Industries, Inc.		92,124		8,476,329
				12,791,690
Forms & Bulk Printing Services — 0.1%
Deluxe Corp.		64,081		2,057,641
Ennis, Inc.		39,632		774,013
RR Donnelley & Sons Co.(a)		108,685		1,223,793
				4,055,447
Fruit & Grain Processing — 0.0%
MGP Ingredients, Inc.		21,388		1,817,766
Funeral Parlors & Cemeteries — 0.2%
Carriage Services, Inc.		22,705		1,463,110
Hillenbrand, Inc.		111,856		5,815,393
Matthews International Corp., Class A		46,359		1,699,985
				8,978,488
Gas Pipeline — 0.2%
Altus Midstream Co., Class A		4,956		303,852
Equitrans Midstream Corp.		626,311		6,476,056
				6,779,908
Glass — 0.0%
Apogee Enterprises, Inc.		38,941		1,875,009
Gold(a) — 0.1%
Coeur Mining, Inc.		393,167		1,981,562
Novagold Resources, Inc.		362,619		2,487,566
				4,469,128
Health Care Equipment & Supplies(a) — 0.0%
Inogen, Inc.		31,294		1,063,996

SERIES  SCHEDULE   OF  INVESTMENTS 83

Schedule of Investments   (continued) December 31, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares			Value
Health Care Equipment & Supplies (continued)
Paragon 28, Inc.		12,970		$	229,439
PROCEPT BioRobotics Corp.		10,631			265,882
					1,559,317
Health Care Facilities — 0.8%
Apollo Medical Holdings, Inc.(a)(b)		57,911			4,255,300
Brookdale Senior Living, Inc.(a)		280,529	��		1,447,530
CVRx, Inc.(a)		11,889			145,402
Ensign Group, Inc.		80,117			6,726,623
Hanger, Inc.(a)		57,173			1,036,547
Joint Corp.(a)		21,917			1,439,728
LifeStance Health Group, Inc.(a)(b)		68,301			650,226
National HealthCare Corp.		18,914			1,285,017
Ontrak, Inc.(a)		12,797			80,493
Pliant Therapeutics, Inc.(a)		38,444			518,994
RxSight, Inc.(a)		12,164			136,845
Select Medical Holdings Corp.		169,130			4,972,422
Sight Sciences, Inc.(a)(b)		16,298			286,356
Tenet Healthcare Corp.(a)		162,528			13,276,912
U.S. Physical Therapy, Inc.		19,451			1,858,543
					38,116,938
Health Care Management Services(a) — 0.4%
1Life Healthcare, Inc.(b)		179,187			3,148,315
Computer Programs & Systems, Inc.		20,882			611,843
Magellan Health, Inc.		36,600			3,476,634
Option Care Health, Inc.(b)		243,104			6,913,878
Progyny, Inc.		98,583			4,963,654
Triple-S Management Corp.		34,718			1,238,738
					20,353,062
Health Care Services — 2.3%
Accelerate Diagnostics, Inc.(a)(b)		52,110			272,014
Accolade, Inc.(a)(b)		76,076			2,005,363
Addus HomeCare Corp.(a)		24,018			2,245,923
Agiliti, Inc.(a)(b)		38,298			886,982
AirSculpt Technologies, Inc.(a)		10,949			188,213
Alignment Healthcare, Inc.(a)		121,217			1,704,311
Allscripts Healthcare Solutions, Inc.(a)(b)		185,663			3,425,482
American Well Corp., Class A(a)		281,434			1,699,861
AMN Healthcare Services, Inc.(a)		72,113			8,821,583
Aveanna Healthcare Holdings, Inc.(a)		58,037			429,474
Biodesix, Inc.(a)(b)		20,553			108,725
Butterfly Network, Inc.(a)(b)		192,306			1,286,527
Cara Therapeutics, Inc.(a)		69,817			850,371
Convey Health Solutions Holdings, Inc.(a)		18,454			154,275
CorVel Corp.(a)		13,403			2,787,824
Cross Country Healthcare, Inc.(a)		55,174			1,531,630
Cue Health, Inc.(a)		21,772			291,963
Forian, Inc.(a)		26,005			234,565
Health Catalyst, Inc.(a)(b)		79,975			3,168,610
HealthEquity, Inc.(a)(b)		125,407			5,548,006
Inari Medical, Inc.(a)		52,963			4,833,933
LHC Group, Inc.(a)		46,927			6,439,792
MEDNAX, Inc.(a)		116,472			3,169,203
ModivCare, Inc.(a)		18,848			2,794,970
NantHealth, Inc.(a)		45,434			47,933
NeoGenomics, Inc.(a)		173,816			5,930,602
NextGen Healthcare, Inc.(a)		85,835			1,527,005
Omnicell, Inc.(a)(b)		66,926			12,076,128
OptimizeRx Corp.(a)		26,897			1,670,573
Ortho Clinical Diagnostics Holdings PLC(a)		183,751			3,930,434
Pennant Group, Inc.(a)		38,847			896,589

Security	Shares		Value
Health Care Services (continued)
Phibro Animal Health Corp., Class A		31,916	$	651,725
Phreesia, Inc.(a)		76,105		3,170,534
Privia Health Group, Inc.(a)		25,352		655,856
R1 RCM, Inc.(a)		181,775		4,633,445
Ryman Hospitality Properties, Inc.(a)		82,374		7,575,113
SOC Telemed, Inc.(a)(b)		91,663		117,329
Surgery Partners, Inc.(a)		52,025		2,778,655
Tabula Rasa HealthCare, Inc.(a)		35,951		539,265
Talis Biomedical Corp.(a)		18,330		73,503
Tivity Health, Inc.(a)		66,397		1,755,537
Viemed Healthcare, Inc.(a)(b)		53,389		278,691
				103,188,517
Health Care: Miscellaneous(a) — 0.2%
Absci Corp.		21,122		173,200
Berkeley Lights, Inc.(b)		74,314		1,351,029
Medpace Holdings, Inc.		44,456		9,675,404
				11,199,633
Home Building — 1.0%
Beazer Homes USA, Inc.(a)		43,548		1,011,185
Century Communities, Inc.		45,831		3,748,517
Hovnanian Enterprises, Inc., Class A(a)(b)		8,030		1,022,139
Installed Building Products, Inc.		36,334		5,076,586
KB Home		122,343		5,472,402
Legacy Housing Corp.(a)(b)		14,089		372,936
LGI Homes, Inc.(a)		33,107		5,114,369
M/I Homes, Inc.(a)		43,678		2,715,898
MDC Holdings, Inc.		87,634		4,892,606
Meritage Homes Corp.(a)		56,563		6,904,080
Taylor Morrison Home Corp.(a)		183,231		6,405,756
Tri Pointe Homes, Inc.(a)(b)		170,149		4,745,456
				47,481,930
Hotel/Motel — 0.2%
Bally’s Corp.(a)		49,563		1,886,368
F45 Training Holdings, Inc.(a)		29,995		326,645
First Watch Restaurant Group, Inc.(a)		14,916		249,992
Krispy Kreme, Inc.(b)		32,752		619,668
Marcus Corp.(a)		34,260		611,884
NEOGAMES SA(a)		15,101		419,506
Red Rock Resorts, Inc., Class A		91,308		5,022,853
Xponential Fitness, Inc., Class A(a)		13,609		278,168
				9,415,084
Household Appliances — 0.0%
Hamilton Beach Brands Holding Co., Class A		10,779		154,786
National Presto Industries, Inc.		7,716		632,943
Snap One Holdings Corp.(a)		19,472		410,470
Traeger, Inc.(a)(b)		32,873		399,736
				1,597,935
Household Equipment & Products — 0.6%
Central Garden & Pet Co.(a)		21,461		1,129,493
Central Garden & Pet Co., Class A(a)		54,278		2,597,202
Energizer Holdings, Inc.		104,572		4,193,337
Helen of Troy Ltd.(a)		36,917		9,025,099
LiveOne, Inc.(a)(b)		71,532		91,561
Tupperware Brands Corp.(a)		74,751		1,142,943
Weber, Inc.(a)(b)		28,168		364,212
Zurn Water Solutions Corp.		185,968		6,769,235
				25,313,082
Household Furnishings — 0.3%
American Woodmark Corp.(a)		25,369		1,654,059

84 2 0 2 1   BLACK ROCK   ANNUAL   REPORT   TO   SHAREHOLDERS

Schedule of Investments   (continued) December 31, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Household Furnishings (continued)
Bassett Furniture Industries, Inc.		13,681	$	229,430
Casper Sleep, Inc.(a)(b)		46,098		307,935
Ethan Allen Interiors, Inc.		34,222		899,697
Flexsteel Industries, Inc.		9,438		253,505
Hooker Furniture Corp.		18,337		426,885
Kirkland’s, Inc.(a)		21,128		315,441
La-Z-Boy, Inc.		67,768		2,460,656
Lifetime Brands, Inc.		19,521		311,750
Lovesac Co.(a)		19,504		1,292,335
Purple Innovation, Inc.(a)(b)		87,727		1,164,137
Sleep Number Corp.(a)		33,581		2,572,305
				11,888,135
Insurance: Life — 0.5%
American Equity Investment Life Holding Co.		126,739		4,932,682
Bright Health Group, Inc.(a)(b)		82,015		282,132
Citizens, Inc.(a)(b)		76,911		408,397
CNO Financial Group, Inc.		191,552		4,566,600
Independence Holding Co.		6,465		366,436
MetroMile, Inc.(a)		139,867		306,309
National Western Life Group, Inc., Class A		4,419		947,610
Selectquote, Inc.(a)(b)		203,308		1,841,971
Trean Insurance Group, Inc.(a)		31,544		281,057
Trupanion, Inc.(a)		58,449		7,717,021
				21,650,215
Insurance: Multi-Line — 0.4%
American National Group, Inc.		11,478		2,167,506
BRP Group, Inc., Class A(a)(b)		73,211		2,643,649
Crawford & Co., Class A		27,856		208,641
eHealth, Inc.(a)		39,271		1,001,411
Goosehead Insurance, Inc., Class A		27,656		3,597,492
Horace Mann Educators Corp.		66,033		2,555,477
James River Group Holdings Ltd.		48,689		1,402,730
Maiden Holdings Ltd.(a)		93,379		285,740
Mr Cooper Group, Inc.(a)		94,847		3,946,584
SiriusPoint Ltd.(a)		130,195		1,058,485
				18,867,715
Insurance: Property-Casualty — 1.5%
AMERISAFE, Inc.		28,588		1,538,892
Argo Group International Holdings Ltd.		48,436		2,814,616
Donegal Group, Inc., Class A		16,442		234,956
Employers Holdings, Inc.		44,106		1,825,106
Enstar Group Ltd.(a)		19,021		4,709,409
Essent Group Ltd.		166,016		7,558,708
Genworth Financial, Inc., Class A(a)		761,926		3,085,800
Greenlight Capital Re Ltd., Class A(a)		45,606		357,551
HCI Group, Inc.		9,261		773,664
Heritage Insurance Holdings, Inc.		37,672		221,511
Hilltop Holdings, Inc.		94,419		3,317,884
Investors Title Co.		2,120		417,958
Kinsale Capital Group, Inc.		32,922		7,831,815
NI Holdings, Inc.(a)		17,790		336,409
NMI Holdings, Inc., Class A(a)		128,480		2,807,288
Palomar Holdings, Inc.(a)		37,737		2,444,226
ProAssurance Corp.		79,587		2,013,551
Radian Group, Inc.		276,128		5,834,585
RLI Corp.		61,260		6,867,246
Safety Insurance Group, Inc.		21,829		1,856,120
Selective Insurance Group, Inc.		90,729		7,434,334
State Auto Financial Corp.		27,251		1,408,604

Security	Shares		Value
Insurance: Property-Casualty (continued)
Stewart Information Services Corp.		40,510	$	3,229,862
United Fire Group, Inc.		30,461		706,391
United Insurance Holdings Corp.		29,849		129,545
Universal Insurance Holdings, Inc.		42,660		725,220
				70,481,251
International Trade & Diversified Logistic(a) — 0.1%
CryoPort, Inc.		62,113		3,675,226
Radiant Logistics, Inc.		64,753		472,049
Vectrus, Inc.		17,636		807,200
				4,954,475
Internet Software & Services(a) — 0.2%
1stdibs.com, Inc.(b)		10,479		131,092
aka Brands Holding Corp.		13,206		122,155
ChannelAdvisor Corp.		48,022		1,185,183
eGain Corp.		34,204		341,356
Flywire Corp.(b)		96,502		3,672,866
Gogo, Inc.(b)		90,829		1,228,916
Lulu’s Fashion Lounge Holdings, Inc.(b)		11,108		113,635
MediaAlpha, Inc., Class A		32,376		499,885
Outbrain, Inc.		11,684		163,576
Quotient Technology, Inc.		131,056		972,436
Remitly Global, Inc.		17,502		360,891
Rent the Runway, Inc.		26,754		218,045
Society Pass, Inc.(b)		3,943		41,047
TrueCar, Inc.		150,084		510,286
Xometry, Inc., Class A		12,099		620,074
				10,181,443
Leisure Time — 0.9%
Acushnet Holdings Corp.		52,222		2,771,944
American Outdoor Brands, Inc.(a)		20,502		408,605
AMMO, Inc.(a)(b)		131,835		718,501
Callaway Golf Co.(a)		176,805		4,851,529
Clarus Corp.		40,047		1,110,103
Drive Shack, Inc.(a)		124,388		177,875
Escalade, Inc.		15,322		241,934
Genius Brands International, Inc.(a)(b)		431,518		453,094
Hilton Grand Vacations, Inc.(a)		131,281		6,841,053
Johnson Outdoors, Inc., Class A		7,691		720,570
Latham Group, Inc.(a)(b)		48,590		1,216,208
Liberty TripAdvisor Holdings, Inc., Class A(a)		111,831		242,673
Life Time Group Holdings, Inc.(a)		57,717		993,310
Lindblad Expeditions Holdings, Inc.(a)		48,608		758,285
Madison Square Garden Entertainment Corp.(a)(b)		39,820		2,800,939
Nautilus, Inc.(a)		45,255		277,413
OneSpaWorld Holdings Ltd.(a)		87,454		876,289
Portillo’s, Inc.(a)(b)		35,782		1,343,256
RCI Hospitality Holdings, Inc.(b)		12,464		970,696
SeaWorld Entertainment, Inc.(a)		78,989		5,123,226
Smith & Wesson Brands, Inc.		72,601		1,292,298
Sturm Ruger & Co., Inc.		26,031		1,770,629
Vista Outdoor, Inc.(a)		87,805		4,045,176
				40,005,606
Life Sciences Tools & Services(a) — 0.0%
Codex DNA, Inc.		6,550		70,740
IsoPlexis Corp.		8,859		81,414
WaVe Life Sciences Ltd.		65,179		204,662
				356,816

SERIES  SCHEDULE   OF  INVESTMENTS 85

Schedule of Investments   (continued) December 31, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Luxury Items — 0.2%
Movado Group, Inc.		24,262	$	1,014,880
Signet Jewelers Ltd.		80,924		7,042,816
Stagwell, Inc.(a)		94,929		823,034
				8,880,730
Machinery: Agricultural — 0.2%
Alamo Group, Inc.		15,002		2,207,994
Integral Ad Science Holding Corp.(a)		26,556		589,809
Lindsay Corp.		16,731		2,543,112
Titan International, Inc.(a)		75,991		832,861
Titan Machinery, Inc.(a)		29,884		1,006,792
				7,180,568
Machinery: Construction & Handling — 0.2%
Astec Industries, Inc.		34,547		2,393,071
Douglas Dynamics, Inc.		35,071		1,369,873
Manitowoc Co., Inc.(a)		51,092		949,800
Terex Corp.		105,098		4,619,057
				9,331,801
Machinery: Industrial — 1.5%
AgEagle Aerial Systems, Inc.(a)		100,550		157,864
Altra Industrial Motion Corp.		99,406		5,126,367
Applied Industrial Technologies, Inc.		58,786		6,037,322
Chart Industries, Inc.(a)		55,902		8,915,810
Columbus McKinnon Corp.		42,217		1,952,958
Desktop Metal, Inc., Class A(a)		282,083		1,396,311
DXP Enterprises, Inc.(a)		25,709		659,950
EnPro Industries, Inc.		31,587		3,476,781
EVI Industries, Inc.(a)		7,342		229,291
Hydrofarm Holdings Group, Inc.(a)(b)		58,984		1,668,657
Hyliion Holdings Corp.(a)		177,447		1,100,171
Hyster-Yale Materials Handling, Inc.		14,893		612,102
John Bean Technologies Corp.		48,132		7,391,150
Kadant, Inc.		17,523		4,038,701
Kennametal, Inc.		128,617		4,618,637
Mayville Engineering Co., Inc.(a)		12,557		187,225
Nikola Corp.(a)(b)		349,906		3,453,572
Omega Flex, Inc.		5,283		670,677
Proto Labs, Inc.(a)		42,842		2,199,937
SPX Corp.(a)		67,529		4,030,131
SPX FLOW, Inc.		63,742		5,512,408
Tennant Co.		28,513		2,310,694
Welbilt, Inc.(a)		200,830		4,773,729
				70,520,445
Machinery: Specialty — 0.1%
Albany International Corp., Class A		47,157		4,171,037
Manufactured Housing(a) — 0.2%
Cavco Industries, Inc.		14,005		4,448,688
Skyline Champion Corp.		80,682		6,372,265
				10,820,953
Medical & Dental Instruments & Supplies — 2.0%
Akoya Biosciences, Inc.(a)		22,635		346,542
Alphatec Holdings, Inc.(a)		109,346		1,249,825
AngioDynamics, Inc.(a)		56,604		1,561,138
Anika Therapeutics, Inc.(a)		21,406		766,977
Antares Pharma, Inc.(a)(b)		243,433		869,056
Apyx Medical Corp.(a)		50,717		650,192
Asensus Surgical, Inc.(a)(b)		353,864		392,789
AtriCure, Inc.(a)		68,329		4,750,915
Atrion Corp.		2,173		1,531,748
Avanos Medical, Inc.(a)		72,524		2,514,407

Security	Shares		Value
Medical & Dental Instruments & Supplies (continued)					��
Axogen, Inc.(a)		59,838	$	560,682
BioLife Solutions, Inc.(a)		16,221		604,557
Cardiovascular Systems, Inc.(a)		60,505		1,136,284
Cerus Corp.(a)(b)		256,778		1,748,658
Community Health Systems, Inc.(a)		190,841		2,540,094
CONMED Corp.		44,469		6,303,925
CryoLife, Inc.(a)		58,286		1,186,120
Cutera, Inc.(a)		26,637		1,100,641
Eargo, Inc.(a)		55,191		281,474
Exagen, Inc.(a)		20,018		232,809
InfuSystem Holdings, Inc.(a)		26,205		446,271
Intersect ENT, Inc.(a)		51,512		1,406,793
Invacare Corp.(a)		50,360		136,979
LeMaitre Vascular, Inc.		29,168		1,465,109
LivaNova PLC(a)		81,953		7,165,151
Meridian Bioscience, Inc.(a)(b)		65,750		1,341,300
Merit Medical Systems, Inc.(a)		78,484		4,889,553
NanoString Technologies, Inc.(a)		69,960		2,954,411
Neogen Corp.(a)		165,309		7,506,682
NuVasive, Inc.(a)		78,900		4,140,672
Ocular Therapeutix, Inc.(a)		116,515		812,110
OraSure Technologies, Inc.(a)(b)		106,969		929,561
Organogenesis Holdings, Inc.(a)		57,622		532,427
Orthofix Medical, Inc.(a)		27,983		869,991
OrthoPediatrics Corp.(a)		21,120		1,264,243
Outset Medical, Inc.(a)		71,671		3,303,316
Owens & Minor, Inc.		110,980		4,827,630
Patterson Cos., Inc.		132,088		3,876,783
Pulmonx Corp.(a)		39,886		1,279,144
Retractable Technologies, Inc.(a)		22,619		156,750
SeaSpine Holdings Corp.(a)		50,511		687,960
Senseonics Holdings, Inc.(a)(b)		651,308		1,738,992
Sientra, Inc.(a)		81,563		299,336
STAAR Surgical Co.(a)		72,709		6,638,332
Surmodics, Inc.(a)		20,853		1,004,072
TransMedics Group, Inc.(a)(b)		40,514		776,248
Treace Medical Concepts, Inc.(a)		45,327		844,895
Utah Medical Products, Inc.		5,607		560,700
ViewRay, Inc.(a)		220,882		1,217,060
				93,401,304
Medical Equipment(a) — 1.4%
Accuray, Inc.(b)		139,476		665,301
Acutus Medical, Inc.		21,186		72,244
AdaptHealth Corp.(b)		109,766		2,684,876
Alpha Teknova, Inc.		9,420		192,922
Apria, Inc.		29,961		976,729
Bionano Genomics, Inc.(b)		445,543		1,332,174
CareDx, Inc.		77,575		3,528,111
ClearPoint Neuro, Inc.		27,334		306,688
Cytek Biosciences, Inc.		22,296		363,871
Fluidigm Corp.(b)		114,760		449,859
Glaukos Corp.		69,676		3,096,401
Haemonetics Corp.		76,828		4,074,957
Icad, Inc.(b)		29,695		213,804
Inspire Medical Systems, Inc.(b)		41,222		9,483,533
iRadimed Corp.		9,949		459,743
iRhythm Technologies, Inc.(b)		45,126		5,310,879
Lantheus Holdings, Inc.		102,712		2,967,350
Natus Medical, Inc.(b)		50,504		1,198,460
Neuronetics, Inc.		36,640		163,414
Nevro Corp.		52,806		4,280,982
PAVmed, Inc.		106,420		261,793

86 2 0 2 1   BLACK ROCK   ANNUAL   REPORT   TO   SHAREHOLDERS

Schedule of Investments   (continued) December 31, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Medical Equipment (continued)
Quanterix Corp.		47,493	$	2,013,703
Quotient Ltd.		108,765		281,701
Rapid Micro Biosystems, Inc., Class A(b)		11,718		124,680
Seer, Inc., Class A		63,328		1,444,512
Shockwave Medical, Inc.		51,683		9,216,629
SI-BONE, Inc.		51,670		1,147,591
Silk Road Medical, Inc.(b)		52,567		2,239,880
Stereotaxis, Inc.		75,290		466,798
Tactile Systems Technology, Inc.		28,932		550,576
Vapotherm, Inc.		35,037		725,616
Varex Imaging Corp.(b)		59,454		1,875,774
Zynex, Inc.		37,297		371,851
				62,543,402
Medical Services(a) — 0.1%
Aspira Women’s Health, Inc.(b)		130,095		230,268
DermTech, Inc.(b)		35,735		564,613
Fulgent Genetics, Inc.		32,112		3,230,146
Innovage Holding Corp.		27,096		135,480
Inotiv, Inc.(b)		22,472		945,397
NeuroPace, Inc.		9,798		98,764
				5,204,668
Metal Fabricating — 0.6%
Compx International, Inc.		2,464		55,366
DMC Global, Inc.(a)		28,677		1,135,896
GrafTech International Ltd.		307,810		3,641,392
Haynes International, Inc.		18,971		765,100
Lawson Products, Inc.(a)		6,868		376,023
MRC Global, Inc.(a)		121,138		833,430
Mueller Industries, Inc.		86,005		5,105,257
Mueller Water Products, Inc., Class A		242,461		3,491,438
NN, Inc.(a)		62,601		256,664
Northwest Pipe Co.(a)		14,320		455,376
RBC Bearings, Inc.(a)(b)		42,818		8,647,952
Worthington Industries, Inc.		50,893		2,781,811
				27,545,705
Metals & Minerals: Diversified — 0.8%
Commercial Metals Co.		183,362		6,654,207
Compass Minerals International, Inc.		52,140		2,663,311
Constellium SE(a)		189,964		3,402,255
Energy Fuels, Inc.(a)(b)		235,510		1,796,941
Ferroglobe PLC(c)		42,394		—
Gatos Silver, Inc.(a)		69,724		723,735
Hecla Mining Co.		814,248		4,250,375
Intrepid Potash, Inc.(a)		14,601		623,901
Materion Corp.		31,315		2,879,101
Minerals Technologies, Inc.		50,874		3,721,433
MP Materials Corp.(a)		116,237		5,279,485
Oil-Dri Corp. of America		8,646		282,984
Perpetua Resources Corp.(a)		49,879		236,925
PolyMet Mining Corp.(a)(b)		61,631		154,077
SunCoke Energy, Inc.		124,359		819,526
U.S. Silica Holdings, Inc.(a)		111,690		1,049,886
United States Lime & Minerals, Inc.(b)		3,248		419,057
				34,957,199
Office Supplies & Equipment — 0.3%
ACCO Brands Corp.		141,218		1,166,461
Eastman Kodak Co.(a)		69,585		325,658
HNI Corp.		66,581		2,799,731
Kimball International, Inc., Class B		54,723		559,816
MillerKnoll, Inc.		114,134		4,472,911

Security	Shares		Value
Office Supplies & Equipment (continued)
Pitney Bowes, Inc.		200,937	$	1,332,212
Steelcase, Inc., Class A		132,169		1,549,021
				12,205,810
Oil & Gas Producers — 0.1%
Civitas Resources, Inc.		66,592		3,261,010
Crescent Energy, Inc.(a)(b)		45,323		574,696
HighPeak Energy, Inc.(b)		9,232		135,156
Kosmos Energy Ltd.(a)		688,537		2,382,338
				6,353,200
Oil Well Equipment & Services — 0.6%
Bristow Group, Inc.(a)(b)		36,429		1,153,707
Cactus, Inc., Class A		85,553		3,262,136
ChampionX Corp.(a)		311,973		6,304,974
Dril-Quip, Inc.(a)		53,209		1,047,153
FTS International, Inc., Class A(a)		13,775		361,594
Helix Energy Solutions Group, Inc.(a)		214,480		669,178
Helmerich & Payne, Inc.		162,590		3,853,383
Liberty Oilfield Services, Inc., Class A(a)		142,279		1,380,106
Matrix Service Co.(a)		40,520		304,710
Nabors Industries Ltd.(a)(b)		10,577		857,689
National Energy Services Reunited Corp.(a)(b)		55,777		527,093
Newpark Resources, Inc.(a)		134,778		396,247
NexTier Oilfield Solutions, Inc.(a)		264,387		938,574
Oceaneering International, Inc.(a)		151,036		1,708,217
Oil States International, Inc.(a)		89,068		442,668
Patterson-UTI Energy, Inc.		283,998		2,399,783
ProPetro Holding Corp.(a)		129,891		1,052,117
RPC, Inc.(a)		103,658		470,607
Select Energy Services, Inc., Class A(a)		95,170		592,909
Solaris Oilfield Infrastructure, Inc., Class A		44,889		294,023
TETRA Technologies, Inc.(a)		185,918		528,007
				28,544,875
Oil, Gas & Consumable Fuels — 0.1%
Archrock, Inc.		206,690		1,546,041
DHT Holdings, Inc.		217,681		1,129,764
Dorian LPG Ltd.		47,150		598,334
Frontline Ltd.(a)(b)		184,534		1,304,655
				4,578,794
Oil: Crude Producers — 2.6%
Antero Resources Corp.(a)		437,549		7,657,108
Berry Corp.		106,962		900,620
Brigham Minerals, Inc., Class A		69,749		1,471,006
California Resources Corp.		123,959		5,294,289
Callon Petroleum Co.(a)		72,770		3,438,383
Centennial Resource Development, Inc., Class A(a)(b)		282,159		1,687,311
Chesapeake Energy Corp.		160,722		10,369,783
CNX Resources Corp.(a)		320,346		4,404,758
Comstock Resources, Inc.(a)(b)		138,213		1,118,143
CVR Energy, Inc.		46,161		775,966
Denbury, Inc.(a)		76,802		5,882,265
Earthstone Energy, Inc., Class A(a)		37,268		407,712
Falcon Minerals Corp.		63,528		309,381
Gevo, Inc.(a)(b)		303,982		1,301,043
Laredo Petroleum, Inc.(a)		19,197		1,154,316
Magnolia Oil & Gas Corp., Class A		219,346		4,139,059
Meta Materials, Inc.(a)(b)		308,991		760,118
Murphy Oil Corp.		224,748		5,868,170
Northern Oil and Gas, Inc.		81,533		1,677,949
Oasis Petroleum, Inc.		30,512		3,844,207

SERIES  SCHEDULE   OF  INVESTMENTS 87

Schedule of Investments   (continued) December 31, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Oil: Crude Producers (continued)
ONE Gas, Inc.		80,984	$	6,283,549
Ovintiv, Inc.		400,974		13,512,824
PDC Energy, Inc.		148,967		7,266,610
Range Resources Corp.(a)		365,671		6,519,914
Ranger Oil Corp., Class A(a)		33,033		889,248
Riley Exploration Permian, Inc.		3,456		66,770
SM Energy Co.		183,508		5,409,816
Southwestern Energy Co.(a)		1,553,894		7,241,146
Talos Energy, Inc.(a)		56,899		557,610
Tellurian, Inc.(a)(b)		566,220		1,743,958
Ur-Energy, Inc.(a)		266,438		325,054
W&T Offshore, Inc.(a)		145,832		471,037
Whiting Petroleum Corp.(a)		60,514		3,914,046
				116,663,169
Oil: Refining & Marketing — 0.3%
Clean Energy Fuels Corp.(a)		237,786		1,457,628
Delek US Holdings, Inc.(a)		99,741		1,495,118
Par Pacific Holdings, Inc.(a)		66,218		1,091,935
PBF Energy, Inc., Class A(a)		146,181		1,895,967
Renewable Energy Group, Inc.(a)		69,048		2,930,397
World Fuel Services Corp.		95,561		2,529,500
				11,400,545
Paints & Coatings — 0.2%
Chase Corp.		11,191		1,114,176
Ferro Corp.(a)		126,320		2,757,566
HB Fuller Co.		79,949		6,475,869
Kronos Worldwide, Inc.		34,905		523,924
				10,871,535
Paper — 0.1%
Clearwater Paper Corp.(a)		25,092		920,124
Glatfelter Corp.		66,295		1,140,274
Neenah, Inc.		25,262		1,169,125
Schweitzer-Mauduit International, Inc.		47,249		1,412,745
Verso Corp., Class A		41,096		1,110,414
				5,752,682
Personal Care — 0.4%
Beauty Health Co.(a)(b)		131,979		3,188,613
Edgewell Personal Care Co.		83,038		3,795,667
Honest Co., Inc.(a)		126,537		1,023,684
Nu Skin Enterprises, Inc., Class A		76,358		3,875,169
Sterling Check Corp.(a)(b)		24,310		498,598
Thorne HealthTech, Inc.(a)(b)		8,069		50,108
USANA Health Sciences, Inc.(a)		18,055		1,827,166
Veru, Inc.(a)		95,480		562,377
WD-40 Co.		20,894		5,111,508
				19,932,890
Pharmaceuticals(a) — 2.0%
ACADIA Pharmaceuticals, Inc.(b)		182,779		4,266,062
Aclaris Therapeutics, Inc.(b)		76,857		1,117,501
Aerie Pharmaceuticals, Inc.		68,373		479,978
Alkermes PLC		245,714		5,715,308
Amneal Pharmaceuticals, Inc.		149,149		714,424
Amphastar Pharmaceuticals, Inc.(b)		57,581		1,341,061
Ampio Pharmaceuticals, Inc.		271,916		154,992
Angion Biomedica Corp.		24,033		69,696
Arrowhead Pharmaceuticals, Inc.		155,248		10,292,942
Atea Pharmaceuticals, Inc.		97,104		868,110
Athira Pharma, Inc.		48,613		633,427

Security	Shares		Value
Pharmaceuticals (continued)
Avalo Therapeutics, Inc.		81,296	$	138,203
Axonics, Inc.		69,925		3,915,800
Axsome Therapeutics, Inc.(b)		42,099		1,590,500
Cassava Sciences, Inc.(b)		59,100		2,582,670
Chimerix, Inc.		110,285		709,133
ChromaDex Corp.(b)		84,727		316,879
Citius Pharmaceuticals, Inc.(b)		169,706		261,347
Corcept Therapeutics, Inc.(b)		148,544		2,941,171
CorMedix, Inc.(b)		52,097		237,041
Cyteir Therapeutics, Inc.		11,795		134,109
DICE Therapeutics, Inc.		20,147		509,921
Durect Corp.		330,083		325,429
Eagle Pharmaceuticals, Inc.		17,404		886,212
Edgewise Therapeutics, Inc.(b)		59,660		911,605
Enanta Pharmaceuticals, Inc.		29,502		2,206,160
Endo International PLC		345,914		1,300,637
Esperion Therapeutics, Inc.		39,709		198,545
Evolus, Inc.		51,241		333,579
Harmony Biosciences Holdings, Inc.		35,086		1,496,067
Heska Corp.		15,256		2,784,067
Ikena Oncology, Inc.		40,587		508,961
Infinity Pharmaceuticals, Inc.		128,670		289,508
Innoviva, Inc.		65,510		1,130,048
Intra-Cellular Therapies, Inc.		107,872		5,646,020
Ironwood Pharmaceuticals, Inc.		222,059		2,589,208
Landos Biopharma, Inc.		8,208		39,398
MEI Pharma, Inc.		169,441		452,407
Mind Medicine MindMed, Inc.		548,974		757,584
Nuvation Bio, Inc.(b)		243,541		2,070,098
Oramed Pharmaceuticals, Inc.		45,675		652,239
Pacira BioSciences, Inc.		67,293		4,049,020
Paratek Pharmaceuticals, Inc.(b)		68,365		306,959
PetIQ, Inc.		43,291		983,139
Prestige Consumer Healthcare, Inc.		76,423		4,635,055
Radius Health, Inc.		70,039		484,670
Rain Therapeutics, Inc.		23,238		299,305
Reata Pharmaceuticals, Inc., Class A(b)		43,243		1,140,318
Revance Therapeutics, Inc.(b)		106,318		1,735,110
Seelos Therapeutics, Inc.		195,283		318,311
SIGA Technologies, Inc.(b)		80,100		602,352
Spectrum Pharmaceuticals, Inc.(b)		283,421		359,945
Supernus Pharmaceuticals, Inc.		74,652		2,176,852
Syndax Pharmaceuticals, Inc.(b)		67,817		1,484,514
Tarsus Pharmaceuticals, Inc.(b)		11,888		267,480
Terns Pharmaceuticals, Inc.		19,690		139,208
TG Therapeutics, Inc.(b)		198,713		3,775,547
TherapeuticsMD, Inc.(b)		743,278		264,235
Theravance Biopharma, Inc.		91,479		1,010,843
Theseus Pharmaceuticals, Inc.(b)		14,910		189,059
Tonix Pharmaceuticals Holding Corp.		815,817		291,818
Ventyx Biosciences, Inc.(b)		13,957		277,186
Zogenix, Inc.(b)		84,910		1,379,788
				89,738,761
Photography — 0.0%
GoPro, Inc., Class A(a)		196,802		2,029,029
Power Transmission Equipment — 0.2%
Advanced Energy Industries, Inc.		57,835		5,266,455
Babcock & Wilcox Enterprises, Inc.(a)(b)		83,634		754,379

88 2 0 2 1   BLACK ROCK   ANNUAL   REPORT   TO   SHAREHOLDERS

Schedule of Investments   (continued) December 31, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Power Transmission Equipment (continued)
Powell Industries, Inc.		13,696	$	403,895
Vicor Corp.(a)		32,268		4,097,390
				10,522,119
Printing & Copying Services(a) — 0.2%
Casella Waste Systems, Inc., Class A		75,295		6,431,699
Cimpress PLC		26,653		1,908,621
				8,340,320
Producer Durables: Miscellaneous — 0.1%
First Advantage Corp.(a)		84,224		1,603,625
Park-Ohio Holdings Corp.		13,595		287,806
Solo Brands, Inc.(a)		18,058		282,247
				2,173,678
Production Technology Equipment — 0.6%
Axcelis Technologies, Inc.(a)		50,638		3,775,569
Cohu, Inc.(a)		74,642		2,843,114
HireRight Holdings Corp.(a)(b)		33,150		530,400
Ichor Holdings Ltd.(a)		43,766		2,014,549
Onto Innovation, Inc.(a)		74,347		7,526,147
Photronics, Inc.(a)		93,999		1,771,881
Ultra Clean Holdings, Inc.(a)(b)		68,172		3,910,346
Veeco Instruments, Inc.(a)		74,636		2,124,887
Xperi Holding Corp.		160,911		3,042,827
				27,539,720
Publishing — 0.2%
Daily Journal Corp.(a)		1,917		683,851
Eros STX Global Corp.(a)		485,200		116,303
Gannett Co., Inc.(a)		227,591		1,213,060
John Wiley & Sons, Inc., Class A		65,886		3,773,291
Scholastic Corp.		39,729		1,587,571
				7,374,076
Radio & TV Broadcasters — 0.4%
Entravision Communications Corp., Class A		88,471		599,833
Gray Television, Inc.		131,240		2,645,798
iHeartMedia, Inc., Class A(a)(b)		171,185		3,601,733
Liberty Media Corp.-Liberty Braves, Class A(a)		14,423		414,661
Liberty Media Corp.-Liberty Braves, Class C(a)(b)		55,093		1,548,113
Sinclair Broadcast Group, Inc., Class A		70,620		1,866,487
TEGNA, Inc.		338,748		6,287,163
				16,963,788
Railroad Equipment — 0.1%
Greenbrier Cos., Inc.		48,934		2,245,581
Trinity Industries, Inc.		118,304		3,572,781
				5,818,362
Real Estate — 0.7%
Cushman & Wakefield PLC(a)		212,583		4,727,846
eXp World Holdings, Inc.		96,062		3,236,329
Kennedy-Wilson Holdings, Inc.		182,632		4,361,252
Newmark Group, Inc., Class A		228,003		4,263,656
Realogy Holdings Corp.(a)(b)		175,973		2,958,106
Redfin Corp.(a)(b)		157,904		6,061,935
Retail Value, Inc.		26,815		172,152
RMR Group, Inc., Class A		22,731		788,311
St. Joe Co.		50,794		2,643,828
Tejon Ranch Co.(a)		32,564		621,321
				29,834,736
Real Estate Investment Trusts (REITs) — 7.1%
Acadia Realty Trust		130,884		2,857,198
AFC Gamma, Inc.		16,662		379,227

Security	Shares		Value
Real Estate Investment Trusts (REITs) (continued)
Agree Realty Corp.		105,419	$	7,522,700
Alexander & Baldwin, Inc.		110,075		2,761,782
Alexander’s, Inc.		3,225		839,468
American Assets Trust, Inc.		76,906		2,886,282
American Finance Trust, Inc.		186,406		1,701,887
Angel Oak Mortgage, Inc.		10,642		174,316
Apartment Investment and Management Co., Class A(a)		231,104		1,784,123
Apollo Commercial Real Estate Finance, Inc.		214,194		2,818,793
Apple Hospitality REIT, Inc.		326,329		5,270,213
Arbor Realty Trust, Inc.		219,852		4,027,689
Ares Commercial Real Estate Corp.		71,882		1,045,164
Armada Hoffler Properties, Inc.		89,285		1,358,918
ARMOUR Residential REIT, Inc.		132,737		1,302,150
Ashford Hospitality Trust, Inc.(a)		27,598		264,941
Blackstone Mortgage Trust, Inc., Class A		240,581		7,366,590
Braemar Hotels & Resorts, Inc.(a)		80,835		412,259
Brandywine Realty Trust		263,181		3,531,889
BrightSpire Capital, Inc.		129,290		1,326,515
Broadmark Realty Capital, Inc.		189,714		1,789,003
Broadstone Net Lease, Inc.		240,863		5,978,220
BRT Apartments Corp.		16,395		393,316
CareTrust REIT, Inc.		149,492		3,412,902
Catchmark Timber Trust, Inc., Class A		76,183		663,554
Centerspace		21,754		2,412,519
Chatham Lodging Trust(a)		71,747		984,369
City Office REIT, Inc.		66,662		1,314,575
Clipper Realty, Inc.		23,302		231,622
Community Healthcare Trust, Inc.		37,930		1,792,951
CoreCivic, Inc.(a)		182,732		1,821,838
Corporate Office Properties Trust		173,441		4,851,145
CTO Realty Growth, Inc.		9,099		558,861
DiamondRock Hospitality Co.(a)		323,151		3,105,481
DigitalBridge Group, Inc.(a)		741,743		6,178,719
Diversified Healthcare Trust		362,135		1,118,997
Dynex Capital, Inc.		52,173		871,811
Easterly Government Properties, Inc.		132,524		3,037,450
EastGroup Properties, Inc.		61,807		14,082,725
Ellington Financial, Inc.		80,835		1,381,470
Empire State Realty Trust, Inc., Class A		218,930		1,948,477
Equity Commonwealth(a)		179,397		4,646,382
Essential Properties Realty Trust, Inc.		185,625		5,351,569
Farmland Partners, Inc.		43,014		514,017
Four Corners Property Trust, Inc.		117,543		3,456,940
Franklin BSP Realty Trust, Inc.(a)		47,192		705,048
Franklin Street Properties Corp.		150,867		897,659
Geo Group, Inc.		181,328		1,405,292
Getty Realty Corp.		60,261		1,933,775
Gladstone Commercial Corp.		57,026		1,469,560
Gladstone Land Corp.		47,201		1,593,506
Global Medical REIT, Inc.		93,832		1,665,518
Global Net Lease, Inc.		159,692		2,440,094
Granite Point Mortgage Trust, Inc.		91,236		1,068,374
Great Ajax Corp.		35,257		463,982
Healthcare Realty Trust, Inc.		226,973		7,181,426
Hersha Hospitality Trust(a)		52,620		482,525
Independence Realty Trust, Inc.		159,885		4,129,830
Indus Realty Trust, Inc.		8,662		702,142
Industrial Logistics Properties Trust		98,858		2,476,393
Innovative Industrial Properties, Inc.		36,292		9,541,530
Invesco Mortgage Capital, Inc.		439,731		1,222,452
iStar, Inc.		105,086		2,714,371

SERIES  SCHEDULE   OF  INVESTMENTS 89

Schedule of Investments   (continued) December 31, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Real Estate Investment Trusts (REITs) (continued)
Kite Realty Group Trust		332,608	$	7,244,202
KKR Real Estate Finance Trust, Inc.		54,000		1,124,820
LTC Properties, Inc.		59,517		2,031,910
LXP Industrial Trust		427,045		6,670,443
MFA Financial, Inc.		689,374		3,143,545
Monmouth Real Estate Investment Corp.		145,021		3,046,891
National Health Investors, Inc.		67,316		3,868,651
National Storage Affiliates Trust		124,242		8,597,546
New York Mortgage Trust, Inc.		586,018		2,179,987
NexPoint Residential Trust, Inc.		34,729		2,911,332
Office Properties Income Trust		73,057		1,814,736
One Liberty Properties, Inc.		25,572		902,180
Orchid Island Capital, Inc.		197,622		889,299
Outfront Media, Inc.		223,676		5,998,990
Paramount Group, Inc.		281,875		2,350,837
Pebblebrook Hotel Trust		199,700		4,467,289
PennyMac Mortgage Investment Trust		151,398		2,623,727
Phillips Edison & Co., Inc.		28,262		933,776
Physicians Realty Trust		339,205		6,387,230
Piedmont Office Realty Trust, Inc., Class A		188,849		3,471,045
Plymouth Industrial REIT, Inc.		47,841		1,530,912
Postal Realty Trust, Inc., Class A		22,832		452,074
PotlatchDeltic Corp.		101,099		6,088,182
Preferred Apartment Communities, Inc.		78,063		1,409,818
PS Business Parks, Inc.		30,823		5,676,672
Ready Capital Corp.		89,562		1,399,854
Redwood Trust, Inc.		173,328		2,286,196
Retail Opportunity Investments Corp.		179,348		3,515,221
RLJ Lodging Trust		252,091		3,511,628
RPT Realty		124,389		1,664,325
Sabra Health Care REIT, Inc.		351,382		4,757,712
Safehold, Inc.		31,779		2,537,553
Saul Centers, Inc.		18,784		995,928
Seritage Growth Properties, Class A(a)		60,705		805,555
Service Properties Trust		249,927		2,196,858
STAG Industrial, Inc.		269,687		12,934,189
Summit Hotel Properties, Inc.(a)		157,085		1,533,150
Sunstone Hotel Investors, Inc.(a)		330,699		3,879,099
Tanger Factory Outlet Centers, Inc.		156,896		3,024,955
Terreno Realty Corp.		112,476		9,593,078
TPG RE Finance Trust, Inc.		91,270		1,124,446
UMH Properties, Inc.		66,822		1,826,245
Uniti Group, Inc.		301,129		4,218,817
Universal Health Realty Income Trust		19,651		1,168,645
Urban Edge Properties		177,499		3,372,481
Urstadt Biddle Properties, Inc., Class A		46,471		989,832
Veris Residential, Inc(a)		133,767		2,458,637
Washington Real Estate Investment Trust		129,439		3,345,998
Whitestone REIT		68,280		691,676
Xenia Hotels & Resorts, Inc.(a)		174,426		3,158,855
				326,431,521
Real Estate Management & Development(a) — 0.1%
Bluegreen Vacations Holding Corp.		22,087		775,254
CorePoint Lodging, Inc.		63,254		993,088
Fathom Holdings, Inc.		9,557		195,536
Forestar Group, Inc.		25,815		561,476
Rafael Holdings, Inc., Class B		14,154		72,185
				2,597,539
Recreational Vehicles & Boats — 0.4%
Arcimoto, Inc.(a)(b)		42,318		329,234
Camping World Holdings, Inc., Class A		64,814		2,618,486

Security	Shares		Value
Recreational Vehicles & Boats (continued)
Lazydays Holdings, Inc.(a)		10,594	$	228,195
LCI Industries		37,952		5,915,578
Malibu Boats, Inc., Class A(a)		31,562		2,169,256
Marine Products Corp.		12,431		155,388
MasterCraft Boat Holdings, Inc.(a)		28,157		797,688
Winnebago Industries, Inc.		49,571		3,713,859
				15,927,684
Rental & Leasing Services: Consumer — 0.7%
Avis Budget Group, Inc.(a)		63,268		13,119,885
Rent-A-Center, Inc.		100,893		4,846,900
WillScot Mobile Mini Holdings Corp.(a)(b)		323,831		13,225,258
				31,192,043
Restaurants — 1.3%
Biglari Holdings, Inc., Class B(a)		1,622		231,249
BJ’s Restaurants, Inc.(a)		33,625		1,161,744
Bloomin’ Brands, Inc.(a)		135,656		2,846,063
Brinker International, Inc.(a)		70,134		2,566,203
Carrols Restaurant Group, Inc.		50,844		150,498
Cheesecake Factory, Inc.(a)		69,976		2,739,560
Cracker Barrel Old Country Store, Inc.		36,215		4,658,698
Dave & Buster’s Entertainment, Inc.(a)		66,426		2,550,758
Del Taco Restaurants, Inc.		45,428		565,579
Denny’s Corp.(a)		93,989		1,503,824
Dine Brands Global, Inc.(a)		24,999		1,895,174
El Pollo Loco Holdings, Inc.(a)		27,176		385,627
Esports Technologies, Inc.(a)		17,117		351,926
Fiesta Restaurant Group, Inc.(a)		26,448		291,192
Hall of Fame Resort & Entertainment Co.(a)		82,051		124,718
Jack in the Box, Inc.		33,474		2,928,306
Kura Sushi USA, Inc., Class A(a)(b)		7,172		579,784
Nathan’s Famous, Inc.		4,875		284,651
Noodles & Co.(a)		67,772		614,692
ONE Group Hospitality, Inc.(a)		37,490		472,749
Papa John’s International, Inc.		50,568		6,749,311
Red Robin Gourmet Burgers, Inc.(a)		23,276		384,752
Rush Street Interactive, Inc.(a)		80,879		1,334,503
Ruth’s Hospitality Group, Inc.(a)		49,520		985,448
Shake Shack, Inc., Class A(a)		57,167		4,125,171
Texas Roadhouse, Inc.		107,326		9,582,065
Wingstop, Inc.		45,656		7,889,357
				57,953,602
Scientific Instruments: Control & Filter — 0.7%
Arlo Technologies, Inc.(a)		128,310		1,345,972
Brady Corp., Class A		72,335		3,898,856
CIRCOR International, Inc.(a)		29,639		805,588
Energy Recovery, Inc.(a)		62,036		1,333,154
ESCO Technologies, Inc.		39,173		3,525,178
Gorman-Rupp Co.		33,421		1,488,906
Helios Technologies, Inc.		49,488		5,204,653
Napco Security Technologies, Inc.(a)(b)		21,723		1,085,715
Resideo Technologies, Inc.(a)		221,300		5,760,439
Thermon Group Holdings, Inc.(a)		50,449		854,102
Watts Water Technologies, Inc., Class A		42,142		8,182,712
				33,485,275
Scientific Instruments: Electrical — 0.7%
Advent Technologies Holdings, Inc.(a)(b)		24,565		172,201
Allied Motion Technologies, Inc.		17,656		644,267
Atkore, Inc.(a)		70,550		7,844,454
AZZ, Inc.		38,572		2,132,646
EnerSys		65,675		5,192,265
Franklin Electric Co., Inc.		70,927		6,706,857

90 2 0 2 1   BLACK ROCK   ANNUAL   REPORT   TO   SHAREHOLDERS

Schedule of Investments   (continued) December 31, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Scientific Instruments: Electrical (continued)
FTC Solar, Inc.(a)		28,767	$	217,479
Preformed Line Products Co.		4,580		296,326
Romeo Power, Inc.(a)		201,721		736,282
WESCO International, Inc.(a)(b)		68,256		8,981,807
				32,924,584
Scientific Instruments: Gauges & Meters — 0.4%
Badger Meter, Inc.		44,358		4,726,789
FARO Technologies, Inc.(a)		27,502		1,925,690
Itron, Inc.(a)		68,866		4,718,698
Luna Innovations, Inc.(a)		44,281		373,732
Mesa Laboratories, Inc.		7,765		2,547,619
Transcat, Inc.(a)(b)		10,356		957,205
Vishay Precision Group, Inc.(a)		19,811		735,384
				15,985,117
Scientific Instruments: Pollution Control(a) — 0.2%
CECO Environmental Corp.		50,515		314,708
Evoqua Water Technologies Corp.		177,107		8,279,752
Heritage-Crystal Clean, Inc.		23,588		755,288
Sharps Compliance Corp.		23,152		165,074
Team, Inc.		44,286		48,272
US Ecology, Inc.		48,476		1,548,323
				11,111,417
Securities Brokerage & Services — 0.1%
BGC Partners, Inc., Class A		480,495		2,234,301
StoneX Group, Inc.(a)		25,339		1,552,014
				3,786,315
Semiconductors & Components — 2.5%
Alpha & Omega Semiconductor Ltd.(a)		32,249		1,952,999
Amkor Technology, Inc.		155,567		3,856,506
Atomera, Inc.(a)(b)		30,157		606,759
AXT, Inc.(a)(b)		60,435		532,432
CEVA, Inc.(a)		33,442		1,446,032
CMC Materials, Inc.		43,556		8,349,250
Diodes, Inc.(a)		66,506		7,303,024
EMCORE Corp.(a)		53,291		371,971
FormFactor, Inc.(a)		118,712		5,427,513
Kopin Corp.(a)		116,604		476,910
Kulicke & Soffa Industries, Inc.		93,762		5,676,352
Lattice Semiconductor Corp.(a)		207,541		15,993,110
MACOM Technology Solutions Holdings, Inc., Class H(a)		74,220		5,811,426
MaxLinear, Inc.(a)		108,489		8,178,986
Power Integrations, Inc.		92,430		8,585,823
Rambus, Inc.(a)		165,133		4,853,259
Semtech Corp.(a)		98,865		8,792,064
Silicon Laboratories, Inc.(a)		61,048		12,601,528
SiTime Corp.(a)		24,355		7,124,812
SkyWater Technology, Inc.(a)(b)		11,711		189,952
SMART Global Holdings, Inc.(a)		26,574		1,886,488
Vishay Intertechnology, Inc.		204,884		4,480,813
				114,498,009
Semiconductors & Semiconductor Equipment — 0.2%
Ambarella, Inc.(a)		54,049		10,966,002
Shipping — 0.5%
A-Mark Precious Metals, Inc.		13,821		844,463
Eagle Bulk Shipping, Inc.		13,991		636,590
Genco Shipping & Trading Ltd.		48,588		777,408
Golar LNG Ltd.(a)		152,905		1,894,493
International Seaways, Inc.		70,537		1,035,483

Security	Shares		Value
Shipping (continued)
Matson, Inc.		63,725	$	5,737,162
Nordic American Tankers Ltd.		249,030		420,861
Safe Bulkers, Inc.(a)(b)		98,949		373,038
Scorpio Tankers, Inc.		74,867		959,046
SFL Corp. Ltd.		190,747		1,554,588
SITE Centers Corp.		263,679		4,174,039
Teekay Corp.(a)		100,908		316,851
Teekay Tankers Ltd., Class A(a)		35,500		386,950
Tidewater, Inc.(a)		67,412		721,982
Two Harbors Investment Corp.		520,771		3,004,849
				22,837,803
Software(a) — 0.3%
Arteris, Inc.(b)		7,031		148,424
AvidXchange Holdings, Inc.		39,644		597,039
Castlight Health, Inc., Class B		165,644		255,092
Consensus Cloud Solutions, Inc.		24,454		1,415,153
Couchbase, Inc.		14,847		370,581
CS Disco, Inc.(b)		12,222		436,936
Enfusion, Inc.		33,617		703,940
EngageSmart, Inc.		24,935		601,432
EverCommerce, Inc.		24,143		380,252
Instructure Holdings, Inc.(b)		18,639		446,963
Intapp, Inc.(b)		16,462		414,184
Kaltura, Inc.		25,079		84,516
MeridianLink, Inc.(b)		18,512		399,489
Model N, Inc.		54,686		1,642,221
Qualys, Inc.		52,160		7,157,395
Stronghold Digital Mining, Inc.		10,336		132,818
Weave Communications, Inc.		8,748		132,795
				15,319,230
Specialty Retail — 2.1%
1-800-Flowers.com, Inc., Class A(a)		40,523		947,023
Aaron’s Co., Inc.		50,244		1,238,515
Abercrombie & Fitch Co., Class A(a)		89,633		3,121,917
Academy Sports & Outdoors, Inc.(a)		118,820		5,216,198
Alta Equipment Group, Inc.(a)		28,647		419,392
American Eagle Outfitters, Inc.		233,195		5,904,497
America’s Car-Mart, Inc.(a)		9,390		961,536
Arko Corp.(a)		183,996		1,613,645
Asbury Automotive Group, Inc.(a)(b)		35,462		6,125,351
Barnes & Noble Education, Inc.(a)		67,497		459,655
Bed Bath & Beyond, Inc.(a)		155,804		2,271,622
Big 5 Sporting Goods Corp.(b)		31,459		598,036
Blink Charging Co.(a)(b)		55,247		1,464,598
Boot Barn Holdings, Inc.(a)		44,923		5,527,775
Buckle, Inc.		45,430		1,922,143
Caleres, Inc.		56,599		1,283,665
CarLotz, Inc.(a)		108,646		246,626
Cato Corp., Class A		31,728		544,452
Chico’s FAS, Inc.(a)		182,679		982,813
Children’s Place, Inc.(a)		21,467		1,702,118
Citi Trends, Inc.(a)		12,704		1,203,704
Conn’s, Inc.(a)		27,774		653,245
Container Store Group, Inc.(a)		47,106		470,118
Designer Brands, Inc., Class A(a)		92,336		1,312,095
Genesco, Inc.(a)		22,064		1,415,847
Group 1 Automotive, Inc.		26,886		5,248,685
Guess?, Inc.		60,371		1,429,585
Haverty Furniture Cos., Inc.		24,812		758,503
Hibbett, Inc.		22,933		1,649,571
JOANN, Inc.		17,579		182,470

SERIES  SCHEDULE   OF  INVESTMENTS 91

Schedule of Investments   (continued) December 31, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Specialty Retail (continued)
Lands’ End, Inc.(a)(b)		24,446	$	479,875
Lumber Liquidators Holdings, Inc.(a)		43,286		738,892
MarineMax, Inc.(a)		31,838		1,879,716
Monro, Inc.		50,694		2,953,939
Murphy USA, Inc.		36,988		7,369,489
National Vision Holdings, Inc.(a)		124,980		5,997,790
ODP Corp.(a)		70,731		2,778,314
OneWater Marine, Inc., Class A		15,646		953,937
Party City Holdco, Inc.(a)(b)		167,392		932,373
RealReal, Inc.(a)		123,880		1,438,247
Regis Corp.(a)(b)		61,213		106,511
Sally Beauty Holdings, Inc.(a)		171,266		3,161,570
Shift Technologies, Inc.(a)		92,987		317,086
Shoe Carnival, Inc.		28,626		1,118,704
Sonic Automotive, Inc., Class A		33,338		1,648,564
Sportsman’s Warehouse Holdings, Inc.(a)		65,177		769,089
Tilly’s, Inc., Class A		36,062		580,959
Torrid Holdings, Inc.(a)		18,211		179,925
TravelCenters of America, Inc.(a)		18,773		969,062
Urban Outfitters, Inc.(a)		104,673		3,073,199
Zumiez, Inc.(a)		32,366		1,553,244
				95,875,885
Steel — 0.2%
Allegheny Technologies, Inc.(a)(b)		195,804		3,119,158
Carpenter Technology Corp.		73,234		2,137,700
Olympic Steel, Inc.		14,995		352,383
Ryerson Holding Corp.		24,661		642,419
Schnitzer Steel Industries, Inc., Class A		40,642		2,110,133
TimkenSteel Corp.(a)		69,113		1,140,364
				9,502,157
Technology: Miscellaneous — 0.4%
Aeva Technologies, Inc.(a)(b)		159,176		1,203,370
Benchmark Electronics, Inc.		54,239		1,469,877
CTS Corp.		48,687		1,787,787
Fabrinet(a)		56,631		6,709,074
Kimball Electronics, Inc.(a)		36,993		804,968
Plexus Corp.(a)		42,785		4,102,654
				16,077,730
Telecommunications Equipment(a) — 0.4%
Akoustis Technologies, Inc.		76,033		507,900
CalAmp Corp.		52,331		369,457
Cambium Networks Corp.		16,382		419,871
Clearfield, Inc.		17,213		1,453,121
Knowles Corp.(b)		136,482		3,186,855
Telesat Corp.		19,206		550,636
Viavi Solutions, Inc.		367,298		6,471,791
Vocera Communications, Inc.		52,657		3,414,280
				16,373,911
Textile Products — 0.0%
Interface, Inc.		87,070		1,388,767
Unifi, Inc.(a)		21,341		494,044
				1,882,811
Textiles Apparel & Shoes — 0.7%
Crocs, Inc.(a)		89,193		11,436,327
Fossil Group, Inc.(a)		71,549		736,239
G-III Apparel Group Ltd.(a)		66,829		1,847,154
Kontoor Brands, Inc.		79,733		4,086,316
Oxford Industries, Inc.		25,042		2,542,264

Security	Shares		Value
Textiles Apparel & Shoes (continued)
PLBY Group, Inc.(a)		43,230	$	1,151,647
Rocky Brands, Inc.		10,512		418,378
Steven Madden Ltd.		123,869		5,756,193
Superior Group of Cos., Inc.		17,077		374,669
Vera Bradley, Inc.(a)		48,038		408,803
Wolverine World Wide, Inc.		124,625		3,590,446
				32,348,436
Thrifts & Mortgage Finance — 0.2%
22nd Century Group, Inc.(a)(b)		275,084		850,010
Blue Foundry Bancorp(a)		41,952		613,758
Greenlane Holdings, Inc., Class A(a)		13,787		13,292
Karat Packaging, Inc.(a)		3,011		60,852
Turning Point Brands, Inc.		23,259		878,725
Universal Corp.		36,468		2,002,823
Vector Group Ltd.		219,409		2,518,815
				6,938,275
Toys — 0.0%
Funko, Inc., Class A(a)		41,634		782,719
Transportation Miscellaneous — 0.2%
Costamare, Inc.		80,468		1,017,920
Hub Group, Inc., Class A(a)		50,674		4,268,778
Textainer Group Holdings Ltd.(a)		73,007		2,607,080
				7,893,778
Truckers — 0.7%
ArcBest Corp.		38,852		4,656,412
Covenant Logistics Group, Inc.(a)		17,465		461,600
Daseke, Inc.(a)(b)		62,326		625,753
Forward Air Corp.		40,972		4,961,300
FRP Holdings, Inc.(a)		10,729		620,136
Heartland Express, Inc.(b)		71,615		1,204,564
Marten Transport Ltd.		89,906		1,542,787
PAM Transportation Services, Inc.(a)		6,494		461,139
Saia, Inc.(a)		40,618		13,689,485
Universal Logistics Holdings, Inc.		12,578		237,221
US Xpress Enterprises, Inc., Class A(a)(b)		35,947		211,009
Werner Enterprises, Inc.		94,684		4,512,639
Yellow Corp.(a)		74,942		943,520
				34,127,565
Utilities: Electrical — 1.1%
ALLETE, Inc.		80,493		5,340,711
Avista Corp.		108,126		4,594,274
Black Hills Corp.		97,777		6,900,123
Clearway Energy, Inc., Class A		60,105		2,012,315
Clearway Energy, Inc., Class C		119,907		4,320,249
MGE Energy, Inc.		55,564		4,570,139
NorthWestern Corp.		81,246		4,644,021
Otter Tail Corp.		62,225		4,444,110
PNM Resources, Inc.		131,662		6,005,104
Portland General Electric Co.		137,779		7,291,265
Unitil Corp.		25,260		1,161,707
				51,284,018
Utilities: Gas Distributors — 0.6%
Chesapeake Utilities Corp.		26,238		3,825,763
New Jersey Resources Corp.		147,829		6,069,859
Northwest Natural Holding Co.		46,253		2,256,221
South Jersey Industries, Inc.		158,933		4,151,330

92 2 0 2 1   BLACK ROCK   ANNUAL   REPORT   TO   SHAREHOLDERS

Schedule of Investments   (continued) December 31, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Utilities: Gas Distributors (continued)
Southwest Gas Holdings, Inc.		92,552	$	6,483,268
Spire, Inc.		77,857		5,077,833
				27,864,274
Utilities: Miscellaneous — 0.3%
Brookfield Infrastructure Corp., Class A		94,572		6,455,485
Ormat Technologies, Inc.		69,402		5,503,578
				11,959,063
Utilities: Telecommunications — 0.9%
8x8, Inc.(a)		173,675		2,910,793
ATN International, Inc.		16,240		648,788
Cogent Communications Holdings, Inc.		65,393		4,785,460
Consolidated Communications Holdings, Inc.(a)		111,749		835,883
Globalstar, Inc.(a)(b)		915,952		1,062,504
IDT Corp., Class B(a)		30,847		1,362,203
Iridium Communications, Inc.(a)		181,239		7,483,358
Radius Global Infrastructure, Inc., Class A(a)		89,671		1,443,703
Shenandoah Telecommunications Co.		73,368		1,870,884
Telephone & Data Systems, Inc.		155,652		3,136,388
United States Cellular Corp.(a)		23,362		736,370
Vonage Holdings Corp.(a)		370,078		7,693,922
Ziff Davis, Inc.(a)(b)		66,609		7,384,274
				41,354,530
Utilities: Water — 0.4%
American States Water Co.		56,208		5,814,156
Artesian Resources Corp., Class A		13,005		602,522
California Water Service Group		80,017		5,750,022
Global Water Resources, Inc.		19,411		331,928
Middlesex Water Co.		26,037		3,132,251
Pure Cycle Corp.(a)		31,022		452,921
SJW Group		42,757		3,129,812
York Water Co.		20,459		1,018,449
				20,232,061
Total Common Stocks — 99.4% (Cost: $3,248,087,950)				4,541,535,676

Security	Shares		Value
Investment Companies
Equity Funds — 0.5%
iShares Russell 2000 ETF(b)(d)		105,698	$	23,512,520
Total Investment Companies — 0.5% (Cost: $21,761,493)				23,512,520
Total Long-Term Investments —99.9% (Cost: $3,269,849,443)				4,565,048,196
Short-Term Securities
Money Market Funds — 6.5%
BlackRock Cash Funds: Institutional, SL Agency Shares, 0.10%(d)(f)(g)		262,564,793		262,643,563
BlackRock Cash Funds: Treasury, SL Agency Shares, 0.01%(d)(f)		32,243,211		32,243,211
Total Short-Term Securities —6.5% (Cost: $294,815,975)				294,886,774
Total Investments — 106.4% (Cost: $3,564,665,418)				4,859,934,970
Liabilities in Excess of Other Assets — (6.4)%				(290,999,985	)
Net Assets — 100.0%			$	4,568,934,985

^(a) Non-income producing security.

^(b) All or a portion of this security is on loan.

^(c) Security is valued using significant unobservable inputs and is classified as Level 3 in the fair value hierarchy.

^(d) Affiliate of the Series.

^(e) Security exempt from registration pursuant to Rule 144A under the Securities Act of 1933, as amended. These securities may be resold in transactions exempt from registration to qualified institutional investors.

^(f) Annualized 7-day yield as of period end.

^(g) All or a portion of this security was purchased with the cash collateral from loaned securities.

For Series compliance purposes, the Series’s industry classifications refer to one or more of the industry sub-classifications used by one or more widely recognized market indexes or rating group indexes, and/or as defined by the investment adviser. These definitions may not apply for purposes of this report, which may combine such industry sub-classifications for reporting ease.

Affiliates

Investments in issuers considered to be affiliate(s) of the Series during the year ended December 31, 2021 for purposes of Section 2(a)(3) of the Investment Company Act of 1940, as amended, were as follows:

Affiliated Issuer	Value at 12/31/20		Purchases at Cost			Proceeds from Sales			Net Realized Gain (Loss)			Change in Unrealized Appreciation (Depreciation)			Value at 12/31/21		Shares Held at 12/31/21		Income			Capital Gain Distributions from Underlying Funds
BlackRock Cash Funds: Institutional, SL Agency Shares	$	294,236,196	$	—		$	(31,496,936	)(a)	$	(3,983	)	$	(91,714	)	$	262,643,563		262,564,793	$	2,008,222	(b)	$	—
BlackRock Cash Funds: Treasury, SL Agency Shares		14,601,134		17,642,077	(a)		—			—			—			32,243,211		32,243,211		4,411			—
iShares Russell 2000 ETF		8,597,035		290,263,154			(277,325,329	)		1,831,892			145,768			23,512,520		105,698		346,117			—
									$	1,827,909		$	54,054		$	318,399,294			$	2,358,750		$	—

^(a) Represents net amount purchased (sold).

^(b) All or a portion represents securities lending income earned from the reinvestment of cash collateral from loaned securities, net of fees and collateral investment expenses, and other payments to and from borrowers of securities.

SERIES  SCHEDULE   OF  INVESTMENTS 93

Schedule of Investments   (continued) December 31, 2021 Master Small Cap Index Series

Derivative Financial Instruments Outstanding as of Period End

Futures Contracts

Description	Number of Contracts		Expiration Date		Notional Amount (000)		Value/ Unrealized Appreciation (Depreciation)
Long Contracts
Russell 2000 E-Mini Index		176		03/18/22	$	19,737	$	183,362

OTC Total Return Swaps

Reference Entity	Payment Frequency	Counterparty(a)	Termination Date		Net Notional		Accrued Unrealized Appreciation (Depreciation)			Net Value of Reference Entity		Gross Notional Amount Net Asset Percentage
Equity Securities Long	Monthly	Goldman Sachs Bank USA(b)		02/27/23	$	2,748,571	$	103,015	(c)	$	2,829,697		0.1	%
	Monthly	HSBC Bank USA N.A.(d)		02/10/23		2,737,254		(38,794	)(e)		2,695,876		0.1
	Monthly	JPMorgan Chase Bank N.A.(f)		02/08/23		2,765,513		85,207	(g)		2,844,427		0.1
							$	149,428		$	8,370,000

^(a) The Series receives the total return on a portfolio of long positions underlying the total return swap. The Series pays the total return on a portfolio of short positions underlying the total return swap. In addition, the Series pays or receives a variable rate of interest, based on a specified benchmark. The benchmark and spread are determined based upon the country and/or currency of the individual underlying positions.

^(c) Amount includes $21,889 of net dividends and financing fees.

^(e) Amount includes $2,584 of net dividends and financing fees.

^(g) Amount includes $6,293 of net dividends and financing fees.

The following are the specified benchmarks (plus or minus a range) used in determining the variable rate of interest:

	(b)	(d)	(f)
Range:	65 basis points	65 basis points	65 basis points
Benchmarks:	USD - 1D Overnight Fed Funds Effective Rate (FEDL01)	USD - 1D Overnight Bank Funding Rate (OBFR01)	USD - 1D Overnight Bank Funding Rate (OBFR01)

The following table represents the individual long positions and related values of the equity securities underlying the total return swap with Goldman Sachs Bank USA as of period end, termination date February 27, 2023:

Security	Shares		Value		% of Basket Value
Reference Entity — Long
Common Stocks
Banks: Diversified
Cadence Bank		64,340	$	1,916,689		67.7	%
Central Pacific Financial Corp.		277		7,803		0.3
Columbia Banking System Inc.		7,952		260,189		9.2
Hanmi Financial Corp.		3,913		92,660		3.3
OFG Bancorp		1,400		37,184		1.3
United Community Banks, Inc.		7,489		269,155		9.5
				2,583,680
Banks: Savings, Thrift & Mortgage Lending
Homestreet, Inc.		3,601		187,252		6.6
Insurance: Property-Casualty
Genworth Financial, Inc., Class A		14,510		58,765		2.1
Net Value of Reference Entity — Goldman Sachs Bank USA			$	2,829,697

The following table represents the individual long positions and related values of the equity securities underlying the total return swap with HSBC Bank PLC as of period end, termination date February 10, 2023:

Security	Shares		Value		% of Basket Value
Reference Entity — Long
Common Stocks
Banks: Diversified
First Financial Bancorp		2,100	$	51,198		1.9	%
Hope Bancorp, Inc.		7,157		105,279		3.9
Preferred Bank		7,149		513,227		19.0
United Community Banks Inc.		6,981		250,897		9.3
				920,601
Banks: Savings, Thrift & Mortgage Lending
Bankunited, Inc.		1,089		46,076		1.7
Berkshire Hills Bancorp, Inc.		8,765		249,189		9.3
				295,265
Computer Services Software & Systems
Envestnet, Inc.		551		43,717		1.6
Insurance: Property-Casualty
James River Group Holdings Ltd.		6,372		183,577		6.8

94 2 0 2 1   BLACK ROCK   ANNUAL   REPORT   TO   SHAREHOLDERS

Schedule of Investments   (continued) December 31, 2021 Master Small Cap Index Series

Security	Shares		Value		% of Basket Value
Office Supplies & Equipment
Pitney Bowes Inc.		74,700	$	495,261		18.4	%
Oil, Gas & Consumable Fuels
Green Plains, Inc.		21,791		757,455		28.1
Net Value of Reference Entity — HSBC Bank PLC			$	2,695,876

The following table represents the individual long positions and related values of the equity securities underlying the total return swap with JPMorgan Chase Bank N.A. as of period end, termination date February 8, 2023:

Security	Shares		Value		% of Basket Value
Reference Entity — Long
Common Stocks
Banks: Diversified
Bancorp, Inc. (The)		2,204	$	55,783		2.0	%
Banner Corp.		131		7,948		0.3
Central Pacific Financial Corp.		6,077		171,189		6.0
Community Bank System Inc.		1,436		106,953		3.8
Customers Bancorp Inc.		757		49,485		1.7
First Bancorp		1,007		46,040		1.6
Flagstar Bancorp Inc.		1,002		48,036		1.7
Great Western Bancorp Inc.		2,950		100,182		3.5
Hanmi Financial Corp.		7,638		180,868		6.4
Heritage Financial Corp.		900		21,996		0.8

Security	Shares		Value		% of Basket Value
Banks: Diversified (continued)
Independent Bank Corp.		1,437	$	117,159		4.1	%
Lakeland Financial Corp.		580		46,481		1.6
National Bank Holding, Class A		1,220		53,607		1.9
Old National Bancorp		8,967		162,482		5.7
Simmons First National Corp., Class A		7,244		214,277		7.5
United Community Banks, Inc.		908		32,634		1.2
				1,415,120
Commercial Finance & Mortgage Companies
Meta Financial Group Inc.		3,260		194,492		6.8
Financial Data & Systems
Green Dot Corp., Class A		1,559		56,498		2.0
Insurance: Property-Casualty
Pacific Premier Bancorp, Inc.		21,295		852,439		30.0
ProAssurance Corp.		2,114		53,484		1.9
Stewart Information Services		589		46,961		1.6
				952,884
Real Estate Investment Trusts (REITs)
Acadia Realty Trust		2,126		46,411		1.6
Getty Realty Corp.		1,693		54,328		1.9
Invesco Mortgage Capital		44,854		124,694		4.4
				225,433
Net Value of Reference Entity — JPMorgan Chase Bank N.A.			$	2,844,427

Balances Reported in the Statement of Assets and Liabilities for OTC Swaps

Description	Swap Premiums Paid		Swap Premiums Received		Unrealized Appreciation		Unrealized Depreciation
OTC Swaps	$	—	$	—	$	188,222	$	(38,794	)

Derivative Financial Instruments Categorized by Risk Exposure

As of period end, the fair values of derivative financial instruments located in the Statement of Assets and Liabilities were as follows:

	Commodity Contracts		Credit Contracts		Equity Contracts		Foreign Currency Exchange Contracts		Interest Rate Contracts		Other Contracts		Total
Assets — Derivative Financial Instruments
Futures contracts
Unrealized appreciation on futures contracts(a)	$	—	$	—	$	183,362	$	—	$	—	$	—	$	183,362
Swaps — OTC
Unrealized appreciation on OTC swaps; Swap premiums paid		—		—		188,222		—		—		—		188,222
	$	—	$	—	$	371,584	$	—	$	—	$	—	$	371,584
Liabilities — Derivative Financial Instruments
Swaps — OTC
Unrealized depreciation on OTC swaps; Swap premiums received	$	—	$	—	$	38,794	$	—	$	—	$	—	$	38,794

^(a) Net cumulative unrealized appreciation (depreciation) on futures contracts and centrally cleared swaps, if any, are reported in the Series Schedule of Investments. In the Statement of Assets and Liabilities, only current day’s variation margin is reported in receivables or payables and the net cumulative unrealized appreciation (depreciation) is included in net unrealized appreciation (depreciation).

SERIES    SCHEDULE   OF  INVESTMENTS 95

Schedule of Investments   (continued) December 31, 2021 Master Small Cap Index Series

For the period ended December 31, 2021, the effect of derivative financial instruments in the Statement of Operations was as follows:

	Commodity Contracts		Credit Contracts		Equity Contracts			Foreign Currency Exchange Contracts		Interest Rate Contracts		Other Contracts		Total
Net Realized Gain (Loss) from:
Futures contracts	$	—	$	—	$	2,233,894		$	—	$	—	$	—	$	2,233,894
Swaps		—		—		919,956			—		—		—		919,956
	$	—	$	—	$	3,153,850		$	—	$	—	$	—	$	3,153,850
Net Change in Unrealized Appreciation (Depreciation) on:
Futures contracts	$	—	$	—	$	(9,368	)	$	—	$	—	$	—	$	(9,368	)
Swaps		—		—		(1,328	)		—		—		—		(1,328	)
	$	—	$	—	$	(10,696	)	$	—	$	—	$	—	$	(10,696	)

Average Quarterly Balances of Outstanding Derivative Financial Instruments

Futures contracts:
Average notional value of contracts — long	$	30,997,566
Total return swaps:
Average notional value	$	4,300,987

For more information about the Series’s investment risks regarding derivative financial instruments, refer to the Notes to Financial Statements.

Derivative Financial Instruments — Offsetting as of Period End

The Series’s derivative assets and liabilities (by type) were as follows:

	Assets		Liabilities
Derivative Financial Instruments
Futures contracts	$	—	$	43,507
Swaps — OTC(a)		188,222		38,794
Total derivative assets and liabilities in the Statement of Assets and Liabilities		188,222		82,301
Derivatives not subject to a Master Netting Agreement or similar agreement (“MNA”)		—		(43,507	)
Total derivative assets and liabilities subject to an MNA	$	188,222	$	38,794

^(a) Includes unrealized appreciation (depreciation) on OTC swaps and swap premiums (paid/received) in the Statement of Assets and Liabilities.

The following table presents the Series’s derivative assets and liabilities by counterparty net of amounts available for offset under an MNA and net of the related collateral received (and pledged) by the Series:

Counterparty	Derivative Assets Subject to an MNA by Counterparty		Derivatives Available for Offset		Non-Cash Collateral Received		Cash Collateral Received		Net Amount of Derivative Assets
Goldman Sachs Bank USA	$	103,015	$	—	$	—	$	—	$	103,015
JPMorgan Chase Bank N.A.		85,207		—		—		—		85,207
	$	188,222	$	—	$	—	$	—	$	188,222
Counterparty	Derivative Liabilities Subject to an MNA by Counterparty		Derivatives Available for Offset		Non-Cash Collateral Pledged		Cash Collateral Pledged		Net Amount of Derivative Liabilities
HSBC Bank USA N.A.	$	38,794	$	—	$	—	$	—	$	38,794

96 2 0 2 1   BLACK ROCK   ANNUAL   REPORT   TO   SHAREHOLDERS

Schedule of Investments   (continued) December 31, 2021 Master Small Cap Index Series

Fair Value Hierarchy as of Period End

Various inputs are used in determining the fair value of financial instruments. For a description of the input levels and information about the Series’s policy regarding valuation of financial instruments, refer to the Notes to Financial Statements.

The following table summarizes the Series’s financial instruments categorized in the fair value hierarchy. The breakdown of the Series’s financial instruments into major categories is disclosed in the Schedule of Investments above.

	Level 1		Level 2			Level 3		Total
Assets
Investments
Long-Term Investments
Common Stocks	$	4,541,468,849	$	—		$	66,827	$	4,541,535,676
Investment Companies		23,512,520		—			—		23,512,520
Short-Term Securities
Money Market Funds		294,886,774		—			—		294,886,774
	$	4,859,868,143	$	—		$	66,827	$	4,859,934,970
Derivative Financial Instruments(a)
Assets
Equity Contracts	$	183,362	$	188,222		$	—	$	371,584
Liabilities
Equity Contracts		—		(38,794	)		—		(38,794	)
	$	183,362	$	149,428		$	—	$	332,790

^(a) Derivative financial instruments are swaps and futures contracts. Swaps and futures contracts are valued at the unrealized appreciation (depreciation) on the instrument.

See notes to financial statements.

SERIES  SCHEDULE   OF  INVESTMENTS 97

Statement of Assets and Liabilities

December 31, 2021

	Master Small Cap Index Series
ASSETS
Investments, at value — unaffiliated(a)(b)	$	4,541,535,676
Investments, at value — affiliated(c)		318,399,294
Cash		436,112
Cash pledged for futures contracts		1,279,000
Receivables:
Investments sold		13,329,968
Securities lending income — affiliated		128,868
Dividends — unaffiliated		3,589,917
Dividends — affiliated		150
Unrealized appreciation on OTC swaps		188,222
Prepaid expenses		16,280
Other assets		4,174
Total assets		4,878,907,661
LIABILITIES
Collateral on securities loaned		262,635,254
Payables:
Investments purchased		5,559,838
Swaps		15,757
Accounting services fees		3,011
Withdrawals to investors		41,545,315
Custodian fees		32,177
Investment advisory fees		36,308
Directors’ fees		6,556
Other accrued expenses		11,855
Other affiliate fees		1,631
Professional fees		42,673
Variation margin on futures contracts		43,507
Unrealized depreciation on OTC swaps		38,794
Total liabilities		309,972,676
NET ASSETS	$	4,568,934,985
NET ASSETS CONSIST OF
Investors’ capital	$	3,273,332,643
Net unrealized appreciation (depreciation)		1,295,602,342
NET ASSETS	$	4,568,934,985
(a)  Investments, at cost — unaffiliated	$	3,248,087,950
(b)   Securities loaned, at value	$	251,860,903
(c)   Investments, at cost — affiliated	$	316,577,468

See notes to financial statements.

98 2 0 2 1   BLACK ROCK  ANNUAL  REPORT  TO  SHAREHOLDERS

Statement of Operations

Year Ended December 31, 2021

	Master Small Cap Index Series
INVESTMENT INCOME
Dividends — unaffiliated		$	45,015,412
Dividends — affiliated			374,943
Interest — unaffiliated			1,427
Securities lending income — affiliated — net			1,983,807
Foreign taxes withheld			(116,353	)
Total investment income			47,259,236
EXPENSES
Investment advisory			452,023
Professional			72,740
Custodian			72,206
Accounting services			25,009
Directors			18,226
Miscellaneous			47,561
Total expenses			687,765
Less:
Fees waived and/or reimbursed by the Manager			(28,093	)
Total expenses after fees waived and/or reimbursed			659,672
Net investment income			46,599,564
REALIZED AND UNREALIZED GAIN (LOSS)
Net realized gain from:
Investments — unaffiliated			320,238,963
Investments — affiliated			1,827,909
Futures contracts			2,233,894
Swaps			919,956
			325,220,722
Net change in unrealized appreciation (depreciation) on:
Investments — unaffiliated			204,565,054
Investments — affiliated			54,054
Futures contracts			(9,368	)
Swaps			(1,328	)
			204,608,412
Net realized and unrealized gain			529,829,134
NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS		$	576,428,698

See notes to financial statements.

SERIES   FINANCIAL  STATEMENTS 99

Statements of Changes in Net Assets

	Master Small Cap Index Series
	Year Ended December 31,
	2021			2020
INCREASE (DECREASE) IN NET ASSETS
OPERATIONS
Net investment income	$	46,599,564		$	40,760,858
Net realized gain		325,220,722			16,530,624
Net change in unrealized appreciation (depreciation)		204,608,412			633,813,782
Net increase in net assets resulting from operations		576,428,698			691,105,264
CAPITAL TRANSACTIONS
Proceeds from contributions		1,298,147,027			935,046,677
Value of withdrawals		(1,200,858,901	)		(1,056,617,358	)
Net increase (decrease) in net assets derived from capital transactions		97,288,126			(121,570,681	)
NET ASSETS
Total increase in net assets		673,716,824			569,534,583
Beginning of year		3,895,218,161			3,325,683,578
End of year	$	4,568,934,985		$	3,895,218,161

See notes to financial statements.

100 2 0 2 1   BLACK ROCK  ANNUAL  REPORT  TO  SHAREHOLDERS

Financial Highlights  

	Master Small Cap Index Series
	Year Ended December 31,
	2021			2020			2019			2018			2017
Total Return
Total return		14.84	%		20.08	%		25.70	%		(10.96	)%		14.69	%
Ratios to Average Net Assets(a)
Total expenses		0.02	%		0.03	%		0.02	%		0.03	%		0.06	%
Total expenses after fees waived and/or reimbursed		0.01	%		0.02	%		0.02	%		0.03	%		0.05	%
Net investment income		1.03	%		1.29	%		1.49	%		1.49	%		1.41	%
Supplemental Data
Net assets, end of year (000)	$	4,568,935		$	3,895,218		$	3,325,684		$	2,309,730		$	1,278,155
Portfolio turnover rate		31	%		27	%		20	%		28	%		30	%

^(a) Excludes fees and expenses incurred indirectly as a result of investments in underlying funds.

See notes to financial statements.

SERIES   FINANCIAL  HIGHLIGHTS 101

Notes to Financial Statements  

1. ORGANIZATION

Quantitative Master Series LLC (the “Master LLC”) is registered under the Investment Company Act of 1940, as amended (the “1940 Act”), as an open-end management investment company. The Master LLC is organized as a Delaware statutory trust. Master Small Cap Index Series (“the “Series”) is a series of the Master LLC. The Series is classified as diversified. The Series’ Limited Liability Company Agreement permits the Board of Directors of the Master LLC (the “Board”) to issue non-transferable interests, subject to certain limitations.

The Series, together with certain other registered investment companies advised by BlackRock Advisors, LLC (the “Manager”) or its affiliates, is included in a complex of open-end equity, multi-asset, index and money market funds referred to as the BlackRock Multi-Asset Complex.

2. SIGNIFICANT ACCOUNTING POLICIES

The financial statements are prepared in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”), which may require management to make estimates and assumptions that affect the reported amounts of assets and liabilities in the financial statements, disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of increases and decreases in net assets from operations during the reporting period. Actual results could differ from those estimates. The Series is considered an investment company under U.S. GAAP and follows the accounting and reporting guidance applicable to investment companies. Below is a summary of significant accounting policies:

Investment Transactions and Income Recognition: For financial reporting purposes, investment transactions are recorded on the dates the transactions are executed. Realized gains and losses on investment transactions are determined using the specific identification method. Dividend income and capital gain distributions, if any, are recorded on the ex-dividend dates. Non-cash dividends, if any, are recorded on the ex-dividend dates at fair value. Dividends from foreign securities where the ex-dividend dates may have passed are subsequently recorded when the Series is informed of the ex-dividend dates. Under the applicable foreign tax laws, a withholding tax at various rates may be imposed on capital gains, dividends and interest. Upon notification from issuers, a portion of the dividend income received from a real estate investment trust may be redesignated as a reduction of cost of the related investment and/or realized gain.

Foreign Taxes: The Series may be subject to foreign taxes (a portion of which may be reclaimable) on income, stock dividends, capital gains on investments, or certain foreign currency transactions. All foreign taxes are recorded in accordance with the applicable foreign tax regulations and rates that exist in the foreign jurisdictions in which the Series invests. These foreign taxes, if any, are paid by the Series and are reflected in its Statement of Operations as follows: foreign taxes withheld at source are presented as a reduction of income, foreign taxes on securities lending income are presented as a reduction of securities lending income, foreign taxes on stock dividends are presented as “Foreign taxes withheld”, and foreign taxes on capital gains from sales of investments and foreign taxes on foreign currency transactions are included in their respective net realized gain (loss) categories. Foreign taxes payable or deferred as of December 31, 2021, if any, are disclosed in the Statement of Assets and Liabilities.

The Series files withholding tax reclaims in certain jurisdictions to recover a portion of amounts previously withheld. The Series may record a reclaim receivable based on collectability, which includes factors such as the jurisdiction’s applicable laws, payment history and market convention. The Statement of Operations includes tax reclaims recorded as well as professional and other fees, if any, associated with recovery of foreign withholding taxes.

Segregation and Collateralization: In cases where the Series enters into certain investments (e.g., futures contracts and swaps) that would be treated as “senior securities” for 1940 Act purposes, the Series may segregate or designate on its books and records cash or liquid assets having a market value at least equal to the amount of its future obligations under such investments. Doing so allows the investments to be excluded from treatment as a “senior security.” Furthermore, if required by an exchange or counterparty agreement, the Series may be required to deliver/deposit cash and/or securities to/with an exchange, or broker-dealer or custodian as collateral for certain investments or obligations.

Indemnifications: In the normal course of business, the Series enters into contracts that contain a variety of representations that provide general indemnification. The Series’ maximum exposure under these arrangements is unknown because it involves future potential claims against the Series, which cannot be predicted with any certainty.

Other: Expenses directly related to the Series are charged to the Series. Other operating expenses shared by several funds, including other funds managed by the Manager, are prorated among those funds on the basis of relative net assets or other appropriate methods.

3. INVESTMENT VALUATION AND FAIR VALUE MEASUREMENTS

Investment Valuation Policies: The Series’ investments are valued at fair value (also referred to as “market value” within the financial statements) each day that the Series is open for business and, for financial reporting purposes, as of the report date. U.S. GAAP defines fair value as the price a fund would receive to sell an asset or pay to transfer a liability in an orderly transaction between market participants at the measurement date. The Series determines the fair values of its financial instruments using various independent dealers or pricing services under policies approved by the Board. If a security’s market price is not readily available or does not otherwise accurately represent the fair value of the security, the security will be valued in accordance with a policy approved by the Board as reflecting fair value. The BlackRock Global Valuation Methodologies Committee (the “Global Valuation Committee”) is the committee formed by management to develop global pricing policies and procedures and to oversee the pricing function for all financial instruments.

102 2 0 2 1   BLACK ROCK  ANNUAL  REPORT  TO  SHAREHOLDERS

Notes to Financial Statements  (continued)

Fair Value Inputs and Methodologies: The following methods and inputs are used to establish the fair value of the Series’ assets and liabilities:

• Equity investments traded on a recognized securities exchange are valued at that day’s official closing price, as applicable, on the exchange where the stock is primarily traded. Equity investments traded on a recognized exchange for which there were no sales on that day may be valued at the last available bid (long positions) or ask (short positions) price.

• Investments in open-end U.S. mutual funds (including money market funds) are valued at that day’s published net asset value (“NAV”).

• Futures contracts are valued based on that day’s last reported settlement or trade price on the exchange where the contract is traded.

• Swap agreements are valued utilizing quotes received daily by independent pricing services or through brokers, which are derived using daily swap curves and models that incorporate a number of market data factors, such as discounted cash flows, trades and values of the underlying reference instruments.

Generally, trading in foreign instruments is substantially completed each day at various times prior to the close of trading on the New York Stock Exchange (“NYSE”). Each business day, the Series uses current market factors supplied by independent pricing services to value certain foreign instruments (“Systematic Fair Value Price”). The Systematic Fair Value Price is designed to value such foreign securities at fair value as of the close of trading on the NYSE, which follows the close of the local markets.

If events (e.g., market volatility, company announcement or a natural disaster) occur that are expected to materially affect the value of such investment, or in the event that application of these methods of valuation results in a price for an investment that is deemed not to be representative of the market value of such investment, or if a price is not available, the investment will be valued by the Global Valuation Committee, or its delegate, in accordance with a policy approved by the Board as reflecting fair value (“Fair Valued Investments”). The fair valuation approaches that may be used by the Global Valuation Committee include market approach, income approach and cost approach. Valuation techniques such as discounted cash flow, use of market comparables and matrix pricing are types of valuation approaches and are typically used in determining fair value. When determining the price for Fair Valued Investments, the Global Valuation Committee, or its delegate, seeks to determine the price that the Series might reasonably expect to receive or pay from the current sale or purchase of that asset or liability in an arm’s-length transaction. Fair value determinations shall be based upon all available factors that the Global Valuation Committee, or its delegate, deems relevant and consistent with the principles of fair value measurement. The pricing of all Fair Valued Investments is subsequently reported to the Board or a committee thereof on a quarterly basis.

For investments in equity or debt issued by privately held companies or funds (“Private Company” or collectively, the “Private Companies”) and other Fair Valued Investments, the fair valuation approaches that are used by the Global Valuation Committee and third-party pricing services utilize one or a combination of, but not limited to, the following inputs.

	Standard Inputs Generally Considered By Third-Party Pricing Services
Market approach	(i)  recent market transactions, including subsequent rounds of financing, in the underlying investment or comparable issuers;
	(ii) recapitalizations and other transactions across the capital structure; and
	(iii)   market multiples of comparable issuers.
Income approach	(i)  future cash flows discounted to present and adjusted as appropriate for liquidity, credit, and/or market risks;
	(ii) quoted prices for similar investments or assets in active markets; and
	(iii)   other risk factors, such as interest rates, yield curves, volatilities, prepayment speeds, loss severities, credit risks, recovery rates, liquidation amounts and/or default rates.
Cost approach.	(i)  audited or unaudited financial statements, investor communications and financial or operational metrics issued by the Private Company;
	(ii) changes in the valuation of relevant indices or publicly traded companies comparable to the Private Company;
	(iii)   relevant news and other public sources; and
	(iv)   known secondary market transactions in the Private Company’s interests and merger or acquisition activity in companies comparable to the Private Company.

Investments in series of preferred stock issued by Private Companies are typically valued utilizing market approach in determining the enterprise value of the company. Such investments often contain rights and preferences that differ from other series of preferred and common stock of the same issuer. Enterprise valuation techniques such as an option pricing model (“OPM”), a probability weighted expected return model (“PWERM”), current value method or a hybrid of those techniques are used as deemed appropriate under the circumstances. The use of these valuation techniques involve a determination of the exit scenarios of the investment in order to appropriately allocate the enterprise value of the company among the various parts of its capital structure.

The Private Companies are not subject to the public company disclosure, timing, and reporting standards applicable to other investments held by the Series. Typically, the most recently available information by a Private Company is as of a date that is earlier than the date the Series is calculating its NAV. This factor may result in a difference between the value of the investment and the price the Series could receive upon the sale of the investment.

Fair Value Hierarchy: Various inputs are used in determining the fair value of financial instruments. These inputs to valuation techniques are categorized into a fair value hierarchy consisting of three broad levels for financial reporting purposes as follows:

• Level 1 – Unadjusted price quotations in active markets/exchanges for identical assets or liabilities that the Series has the ability to access;

• Level 2 – Other observable inputs (including, but not limited to, quoted prices for similar assets or liabilities in markets that are active, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the assets or liabilities (such as interest rates, yield curves, volatilities, prepayment speeds, loss severities, credit risks and default rates) or other market–corroborated inputs); and

SERIES    NOTES  TO  FINANCIAL  STATEMENTS 103

Notes to Financial Statements  (continued)

• Level 3 – Unobservable inputs based on the best information available in the circumstances, to the extent observable inputs are not available (including the Global Valuation Committee’s assumptions used in determining the fair value of financial instruments).

The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). Accordingly, the degree of judgment exercised in determining fair value is greatest for instruments categorized in Level 3. The inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, for disclosure purposes, the fair value hierarchy classification is determined based on the lowest level input that is significant to the fair value measurement in its entirety. Investments classified within Level 3 have significant unobservable inputs used by the Global Valuation Committee in determining the price for Fair Valued Investments. Level 3 investments include equity or debt issued by Private Companies that may not have a secondary market and/or may have a limited number of investors. The categorization of a value determined for financial instruments is based on the pricing transparency of the financial instruments and is not necessarily an indication of the risks associated with investing in those securities.

4. SECURITIES AND OTHER INVESTMENTS

Securities Lending: The Series may lend its securities to approved borrowers, such as brokers, dealers and other financial institutions. The borrower pledges and maintains with the Series collateral consisting of cash, an irrevocable letter of credit issued by a bank, or securities issued or guaranteed by the U.S. Government. The initial collateral received by the Series is required to have a value of at least 102% of the current value of the loaned securities for securities traded on U.S. exchanges and a value of at least 105% for all other securities. The collateral is maintained thereafter at a value equal to at least 100% of the current market value of the securities on loan. The market value of the loaned securities is determined at the close of each business day of the Series and any additional required collateral is delivered to the Series, or excess collateral returned by the Series, on the next business day. During the term of the loan, the Series is entitled to all distributions made on or in respect of the loaned securities, but does not receive interest income on securities received as collateral. Loans of securities are terminable at any time and the borrower, after notice, is required to return borrowed securities within the standard time period for settlement of securities transactions.

The market value of any securities on loan, all of which were classified as common stocks in the Series’ Schedule of Investments, and the value of any related collateral are shown separately in the Statement of Assets and Liabilities as a component of investments at value - unaffiliated, and collateral on securities loaned at value, respectively. As of period end, any securities on loan were collateralized by cash and/or U.S. Government obligations. Cash collateral invested by the securities lending agent, BlackRock Institutional Trust Company, N.A. (“BTC”), if any, is disclosed in the Schedule of Investments.

Securities lending transactions are entered into by the Series under Master Securities Lending Agreements (each, an “MSLA”), which provide the right, in the event of default (including bankruptcy or insolvency), for the non-defaulting party to liquidate the collateral and calculate a net exposure to the defaulting party or request additional collateral. In the event that a borrower defaults, the Series, as lender, would offset the market value of the collateral received against the market value of the securities loaned. When the value of the collateral is greater than that of the market value of the securities loaned, the lender is left with a net amount payable to the defaulting party. However, bankruptcy or insolvency laws of a particular jurisdiction may impose restrictions on or prohibitions against such a right of offset in the event of an MSLA counterparty’s bankruptcy or insolvency. Under the MSLA, absent an event of default, the borrower can resell or re-pledge the loaned securities, and the Series can reinvest cash collateral received in connection with loaned securities. Upon an event of default, the parties’ obligations to return the securities or collateral to the other party are extinguished, and the parties can resell or re-pledge the loaned securities or the collateral received in connection with the loaned securities in order to satisfy the defaulting party’s net payment obligation for all transactions under the MSLA. The defaulting party remains liable for any deficiency.

As of period end, the following table is a summary of the Series’ securities on loan by counterparty which are subject to offset under an MSLA:

			Securities	Cash Collateral					Non-Cash Collateral				Net
Counterparty	Loaned at Value					Received	(a)		Received at Fair Value	(a)	Amount
Barclays Capital, Inc.		$	9,507,274		$	(9,507,274	)	$	—			$	—
BNP Paribas SA			2,313,007			(2,313,007	)		—				—
BofA Securities, Inc.			52,908,145			(52,908,145	)		—				—
Citadel Clearing LLC			54,474			(54,474	)		—				—
Citigroup Global Markets, Inc.			13,514,459			(13,514,459	)		—				—
Credit Suisse Securities (USA) LLC			17,172,803			(17,172,803	)		—				—
J.P. Morgan Securities LLC			101,109,904			(101,109,904	)		—				—
Jefferies LLC			804,739			(804,739	)		—				—
Nomura Securities International, Inc.			541,847			(541,847	)		—				—
Pershing LLC			18,190			(18,190	)		—				—
Scotia Capital (USA), Inc.			4,336,279			(4,336,279	)		—				—
State Street Bank & Trust Co.			12,279,004			(12,279,004	)		—				—
Toronto Dominion Bank			9,473,306			(9,473,306	)		—				—
UBS AG			10,727,308			(10,727,308	)		—				—
UBS Securities LLC			5,596,589			(5,596,589	)		—				—
Virtu Americas LLC			138,892			(138,892	)		—				—
Wells Fargo Bank N.A			1,818,159			(1,818,159	)		—				—
Wells Fargo Securities LLC			9,546,524			(9,546,524	)		—				—
		$	251,860,903		$	(251,860,903	)	$	—			$	—

^(a) Collateral received in excess of the market value of securities on loan is not presented in this table. The total cash collateral received by the Series is disclosed in the Series’s Statement of Assets and Liabilities.

104 2 0 2 1   BLACK ROCK  ANNUAL  REPORT  TO  SHAREHOLDERS

Notes to Financial Statements  (continued)

The risks of securities lending include the risk that the borrower may not provide additional collateral when required or may not return the securities when due. To mitigate these risks, the Series benefits from a borrower default indemnity provided by BlackRock, Inc. (“BlackRock”). BlackRock’s indemnity allows for full replacement of the securities loaned to the extent the collateral received does not cover the value on the securities loaned in the event of borrower default. The Series could incur a loss if the value of an investment purchased with cash collateral falls below the market value of loaned securities or if the value of an investment purchased with cash collateral falls below the value of the original cash collateral received. Such losses are borne entirely by the Series.

5. DERIVATIVE FINANCIAL INSTRUMENTS

The Series engages in various portfolio investment strategies using derivative contracts both to increase the returns of the Series and/or to manage its exposure to certain risks such as credit risk, equity risk, interest rate risk, foreign currency exchange rate risk, commodity price risk or other risks (e.g., inflation risk). Derivative financial instruments categorized by risk exposure are included in the Schedule of Investments. These contracts may be transacted on an exchange or over-the-counter (“OTC”).

Futures Contracts: Futures contracts are purchased or sold to gain exposure to, or manage exposure to, changes in interest rates (interest rate risk) and changes in the value of equity securities (equity risk) or foreign currencies (foreign currency exchange rate risk).

Futures contracts are exchange-traded agreements between the Series and a counterparty to buy or sell a specific quantity of an underlying instrument at a specified price and on a specified date. Depending on the terms of a contract, it is settled either through physical delivery of the underlying instrument on the settlement date or by payment of a cash amount on the settlement date. Upon entering into a futures contract, the Series is required to deposit initial margin with the broker in the form of cash or securities in an amount that varies depending on a contract’s size and risk profile. The initial margin deposit must then be maintained at an established level over the life of the contract. Amounts pledged, which are considered restricted, are included in cash pledged for futures contracts in the Statement of Assets and Liabilities.

Securities deposited as initial margin are designated in the Schedule of Investments and cash deposited, if any, are shown as cash pledged for futures contracts in the Statement of Assets and Liabilities. Pursuant to the contract, the Series agrees to receive from or pay to the broker an amount of cash equal to the daily fluctuation in market value of the contract (“variation margin”). Variation margin is recorded as unrealized appreciation (depreciation) and, if any, shown as variation margin receivable (or payable) on futures contracts in the Statement of Assets and Liabilities. When the contract is closed, a realized gain or loss is recorded in the Statement of Operations equal to the difference between the notional amount of the contract at the time it was opened and the notional amount at the time it was closed. The use of futures contracts involves the risk of an imperfect correlation in the movements in the price of futures contracts and interest rates, foreign currency exchange rates or underlying assets.

Swaps: Swap contracts are entered into to manage exposure to issuers, markets and securities. Such contracts are agreements between the Series and a counterparty to make periodic net payments on a specified notional amount or a net payment upon termination. Swap agreements are privately negotiated in the OTC market and may be entered into as a bilateral contract (“OTC swaps”) or centrally cleared (“centrally cleared swaps”).

For OTC swaps, any upfront premiums paid and any upfront fees received are shown as swap premiums paid and swap premiums received, respectively, in the Statement of Assets and Liabilities and amortized over the term of the contract. The daily fluctuation in market value is recorded as unrealized appreciation (depreciation) on OTC Swaps in the Statement of Assets and Liabilities. Payments received or paid are recorded in the Statement of Operations as realized gains or losses, respectively. When an OTC swap is terminated, a realized gain or loss is recorded in the Statement of Operations equal to the difference between the proceeds from (or cost of) the closing transaction and the Series’ basis in the contract, if any. Generally, the basis of the contract is the premium received or paid.

In a centrally cleared swap, immediately following execution of the swap contract, the swap contract is novated to a central counterparty (the “CCP”) and the CCP becomes the Series’ counterparty on the swap. The Series is required to interface with the CCP through the broker. Upon entering into a centrally cleared swap, the Series is required to deposit initial margin with the broker in the form of cash or securities in an amount that varies depending on the size and risk profile of the particular swap. Securities deposited as initial margin are designated in the Schedule of Investments and cash deposited is shown as cash pledged for centrally cleared swaps in the Statement of Assets and Liabilities. Amounts pledged, which are considered restricted cash, are included in cash pledged for centrally cleared swaps in the Statement of Assets and Liabilities. Pursuant to the contract, the Series agrees to receive from or pay to the broker an amount of cash equal to the daily fluctuation in market value of the contract (“variation margin”). Variation margin is recorded as unrealized appreciation (depreciation) and shown as variation margin receivable (or payable) on centrally cleared swaps in the Statement of Assets and Liabilities. Payments received from (paid to) the counterparty are amortized over the term of the contract and recorded as realized gains (losses) in the Statement of Operations, including those at termination.

• Total return swaps — Total return swaps are entered into to obtain exposure to a security or market without owning such security or investing directly in such market or to exchange the risk/return of one security or market (e.g., fixed-income) with another security or market (e.g., equity or commodity prices) (equity risk, commodity price risk and/or interest rate risk).

Total return swaps are agreements in which there is an exchange of cash flows whereby one party commits to make payments based on the total return (distributions plus capital gains/losses) of an underlying instrument, or basket of underlying instruments, in exchange for fixed or floating rate interest payments. If the total return of the instrument(s) or index underlying the transaction exceeds or falls short of the offsetting fixed or floating interest rate obligation, the Series receives payment from or makes a payment to the counterparty.

Certain total return swaps are designed to function as a portfolio of direct investments in long and short equity positions. This means that the Series has the ability to trade in and out of these long and short positions within the swap and will receive the economic benefits and risks equivalent to direct investment in these positions, subject to certain adjustments due to events related to the counterparty. Benefits and risks include capital appreciation (depreciation), corporate actions and dividends received and paid, all of which are reflected in the swap’s market value. The market value also includes interest charges and credits (“financing fees”) related to the notional values of the long and short positions and cash balances within the swap. These interest charges and credits are based on a specified benchmark rate plus or minus a specified spread determined based upon the country and/or currency of the positions in the portfolio.

SERIES    NOTES  TO  FINANCIAL  STATEMENTS 105

Notes to Financial Statements  (continued)

Positions within the swap and financing fees are reset periodically. During a reset, any unrealized appreciation (depreciation) on positions and accrued financing fees become available for cash settlement between the Series and the counterparty. The amounts that are available for cash settlement are recorded as realized gains or losses in the Statement of Operations. Cash settlement in and out of the swap may occur at a reset date or any other date, at the discretion of the Series and the counterparty, over the life of the agreement. Certain swaps have no stated expiration and can be terminated by either party at any time.

Swap transactions involve, to varying degrees, elements of interest rate, credit and market risk in excess of the amounts recognized in the Statement of Assets and Liabilities. Such risks involve the possibility that there will be no liquid market for these agreements, that the counterparty to the agreements may default on its obligation to perform or disagree as to the meaning of the contractual terms in the agreements, and that there may be unfavorable changes in interest rates and/or market values associated with these transactions.

Master Netting Arrangements: In order to define its contractual rights and to secure rights that will help it mitigate its counterparty risk, the Series may enter into an International Swaps and Derivatives Association, Inc. Master Agreement (“ISDA Master Agreement”) or similar agreement with its counterparties. An ISDA Master Agreement is a bilateral agreement between a Series and a counterparty that governs certain OTC derivatives and typically contains, among other things, collateral posting terms and netting provisions in the event of a default and/or termination event. Under an ISDA Master Agreement, a Series may, under certain circumstances, offset with the counterparty certain derivative financial instruments’ payables and/or receivables with collateral held and/or posted and create one single net payment. The provisions of the ISDA Master Agreement typically permit a single net payment in the event of default including the bankruptcy or insolvency of the counterparty. However, bankruptcy or insolvency laws of a particular jurisdiction may impose restrictions on or prohibitions against the right of offset in bankruptcy, insolvency or other events.

Collateral Requirements: For derivatives traded under an ISDA Master Agreement, the collateral requirements are typically calculated by netting the mark-to-market amount for each transaction under such agreement and comparing that amount to the value of any collateral currently pledged by the Series and the counterparty.

Cash collateral that has been pledged to cover obligations of the Series and cash collateral received from the counterparty, if any, is reported separately in the Statement of Assets and Liabilities as cash pledged as collateral and cash received as collateral, respectively. Non-cash collateral pledged by the Series, if any, is noted in the Schedule of Investments. Generally, the amount of collateral due from or to a counterparty is subject to a certain minimum transfer amount threshold before a transfer is required, which is determined at the close of business of the Series. Any additional required collateral is delivered to/pledged by the Series on the next business day. Typically, the counterparty is not permitted to sell, re-pledge or use cash and non-cash collateral it receives. The Series generally agrees not to use non-cash collateral that it receives but may, absent default or certain other circumstances defined in the underlying ISDA Master Agreement, be permitted to use cash collateral received. In such cases, interest may be paid pursuant to the collateral arrangement with the counterparty. To the extent amounts due to the Series from the counterparties are not fully collateralized, the Series bears the risk of loss from counterparty non-performance. Likewise, to the extent the Series has delivered collateral to a counterparty and stands ready to perform under the terms of its agreement with such counterparty, the Series bears the risk of loss from a counterparty in the amount of the value of the collateral in the event the counterparty fails to return such collateral. Based on the terms of agreements, collateral may not be required for all derivative contracts.

For financial reporting purposes, the Series does not offset derivative assets and derivative liabilities that are subject to netting arrangements, if any, in the Statement of Assets and Liabilities.

6. INVESTMENT ADVISORY AGREEMENT AND OTHER TRANSACTIONS WITH AFFILIATES

Investment Advisory: The Master LLC, on behalf of the Series, entered into an Investment Advisory Agreement with the Manager, the Series’ investment adviser and an indirect, wholly-owned subsidiary of BlackRock, to provide investment advisory and administrative services. The Manager is responsible for the management of the Series’s portfolio and provides the personnel, facilities, equipment and certain other services necessary to the operations of the Series.

For such services, the Series pays the Manager a monthly fee at an annual rate equal to 0.01% of the average daily value of the Series’ net assets.

For the year ended December 31, 2021, the Series reimbursed the Manager for certain accounting services, which is included in accounting services in the Statement of Operations. The reimbursements were $15,978.

With respect to the Series, the Manager entered into a sub-advisory agreement with BlackRock Fund Advisors (“BFA”), an affiliate of the Manager. The Manager pays BFA for services it provides for that portion of the Series for which BFA acts as sub-adviser, a monthly fee that is equal to a percentage of the investment advisory fees paid by the Series to the Manager.

Expense Limitations, Waivers and Reimbursements: The Manager contractually agreed to waive its investment advisory fees by the amount of investment advisory fees the Series pays to the Manager indirectly through its investment in affiliated money market funds (the “affiliated money market fund waiver”) through June 30, 2023. The contractual agreement may be terminated upon 90 days’ notice by a majority of the directors who are not “interested persons” of the Series, as defined in the 1940 Act (“Independent Directors”), or by a vote of a majority of the outstanding voting securities of the Series. The amount of waivers and/or reimbursements of fees and expenses made pursuant to the expense limitation described below will be reduced by the amount of the affiliated money market fund waiver. This amount is included in fees waived and/or reimbursed by the Manager in the Statement of Operations. For the year ended December 31, 2021, the amount waived was $25,097.

The Manager has contractually agreed to waive its investment advisory fee with respect to any portion of the Series’ assets invested in affiliated equity and fixed-income mutual funds and affiliated exchange-traded funds that have a contractual management fee through June 30, 2023. The contractual agreement may be terminated upon 90 days’ notice by a majority of the Independent Directors, or by a vote of a majority of the outstanding voting securities of the Series. This amount is included in fees waived and/or reimbursed by the Manager in the Statement of Operations. For the year ended December 31, 2021, the Manager waived $2,996 in investment advisory fees pursuant to this arrangement.

106 2 0 2 1   BLACK ROCK  ANNUAL  REPORT  TO  SHAREHOLDERS

Notes to Financial Statements  (continued)

The Manager contractually agreed to waive and/or reimburse fees or expenses in order to limit expenses, excluding interest expense, dividend expense, tax expense, acquired fund fees and expenses, and certain other fund expenses, which constitute extraordinary expenses not incurred in the ordinary course of the Series’ business (“expense limitation”). The expense limitation as a percentage of average daily net assets is 0.07%.

The Manager has agreed not to reduce or discontinue the contractual expense limitations through June 30, 2023, unless approved by the Board, including a majority of the Independent Directors, or by a vote of a majority of the outstanding voting securities of the Series. For the year ended December 31, 2021, there were no fees waived and/or reimbursed by the Manager pursuant to this agreement.

Securities Lending: The U.S. Securities and Exchange Commission (“SEC”) has issued an exemptive order which permits BTC, an affiliate of the Manager, to serve as securities lending agent for the Series, subject to applicable conditions. As securities lending agent, BTC bears all operational costs directly related to securities lending, including any custodial costs. The Series is responsible for fees in connection with the investment of cash collateral received for securities on loan (the “collateral investment fees”). The cash collateral is invested in a money market fund, BlackRock Cash Funds: Institutional or BlackRock Cash Funds: Treasury, managed by the Manager or its affiliates. However, BTC has agreed to reduce the amount of securities lending income it receives in order to effectively limit the collateral investment fees the Series bears to an annual rate of 0.04%. The SL Agency Shares of such money market fund will not be subject to a sales load, distribution fee or service fee. The money market fund in which the cash collateral has been invested may, under certain circumstances, impose a liquidity fee of up to 2% of the value redeemed or temporarily restrict redemptions for up to 10 business days during a 90 day period, in the event that the money market fund’s weekly liquid assets fall below certain thresholds.

Securities lending income is equal to the total of income earned from the reinvestment of cash collateral, net of fees and other payments to and from borrowers of securities, and less the collateral investment fees. The Series retains a portion of securities lending income and remits a remaining portion to BTC as compensation for its services as securities lending agent.

Pursuant to the current securities lending agreement, the Series retains 77% of securities lending income (which excludes collateral investment fees), and this amount retained can never be less than 70% of the total of securities lending income plus the collateral investment fees.

In addition, commencing the business day following the date that the aggregate securities lending income earned across the BlackRock Multi-Asset Complex in a calendar year exceeds a specified threshold, the Series, pursuant to the securities lending agreement, will retain for the remainder of that calendar year securities lending income in an amount equal to 81% of securities lending income (which excludes collateral investment fees), and this amount retained can never be less than 70% of the total of securities lending income plus the collateral investment fees.

The share of securities lending income earned by the Series is shown as securities lending income — affiliated — net in the Statement of Operations. For the year ended December 31, 2021, the Series paid BTC $673,341 for securities lending agent services.

Interfund Lending: In accordance with an exemptive order (the “Order”) from the SEC, the Series may participate in a joint lending and borrowing facility for temporary purposes (the “Interfund Lending Program”), subject to compliance with the terms and conditions of the Order, and to the extent permitted by the Series’ investment policies and restrictions. The Series is currently permitted to borrow and lend under the Interfund Lending Program.

A lending BlackRock fund may lend in aggregate up to 15% of its net assets but may not lend more than 5% of its net assets to any one borrowing fund through the Interfund Lending Program. A borrowing BlackRock fund may not borrow through the Interfund Lending Program or from any other source more than 33 1/3% of its total assets (or any lower threshold provided for by the fund’s investment restrictions). If a borrowing BlackRock fund’s total outstanding borrowings exceed 10% of its total assets, each of its outstanding interfund loans will be subject to collateralization of at least 102% of the outstanding principal value of the loan. All interfund loans are for temporary or emergency purposes and the interest rate to be charged will be the average of the highest current overnight repurchase agreement rate available to a lending fund and the bank loan rate, as calculated according to a formula established by the Board.

During the year ended December 31, 2021, the Series did not participate in the Interfund Lending Program.

Directors and Officers: Certain directors and/or officers of Master LLC are directors and/or officers of BlackRock or its affiliates.

Other Transactions: The Series may purchase securities from, or sell securities to, an affiliated fund provided the affiliation is due solely to having a common investment adviser, common officers, or common directors. For the year ended December 31, 2021, the purchase and sale transactions and any net realized gains (losses) with affiliated funds in compliance with Rule 17a-7 under the 1940 Act were as follows:

Series Name	Purchases		Sales		Net Realized Gain (Loss)
Master Small Cap Index Series	$	109,560,663	$	300,274,474	$ 130,976,824

7. PURCHASES AND SALES

For the year ended December 31, 2021, purchases and sales of investments, excluding short-term investments, were $1,541,200,101 and $1,375,420,678, respectively.

8. INCOME TAX INFORMATION

The Series is classified as a partnership for U.S. federal income tax purposes. As such, each investor in the Series is treated as the owner of its proportionate share of net assets, income, expenses and realized and unrealized gains and losses of the Series. Therefore, no U.S. federal income tax provision is required. It is intended that the Series’ assets will be managed so an investor in the Series can satisfy the requirements of Subchapter M of the Internal Revenue Code of 1986, as amended.

SERIES    NOTES  TO  FINANCIAL  STATEMENTS 107

Notes to Financial Statements  (continued)

The Series files U.S. federal and various state and local tax returns. No income tax returns are currently under examination. The statute of limitations on the Series’s U.S. federal tax returns generally remains open for a period of three fiscal years after they are filed. The statutes of limitations on the Series’s state and local tax returns may remain open for an additional year depending upon the jurisdiction.

Management has analyzed tax laws and regulations and their application to the Series as of December 31, 2021, inclusive of the open tax return years, and does not believe that there are any uncertain tax positions that require recognition of a tax liability in the Series’ financial statements.

As of December 31, 2021, gross unrealized appreciation and depreciation based on cost of investments (including short positions and derivatives, if any) for U.S. federal income tax purposes were as follows:

Series Name	Tax Cost		Gross Unrealized Appreciation		Gross Unrealized Depreciation			Net Unrealized Appreciation (Depreciation)
Master Small Cap Index Series	$	3,644,573,012	$	1,615,252,966	$	(399,592,152	)	$	1,215,660,814

9. BANK BORROWINGS

The Master LLC, on behalf of the Series, along with certain other funds managed by the Manager and its affiliates (“Participating Funds”), is a party to a 364-day, $2.25 billion credit agreement with a group of lenders. Under this agreement, the Series may borrow to fund shareholder redemptions. Excluding commitments designated for certain individual funds, the Participating Funds, including the Series, can borrow up to an aggregate commitment amount of $1.75 billion at any time outstanding, subject to asset coverage and other limitations as specified in the agreement. The credit agreement has the following terms: a fee of 0.10% per annum on unused commitment amounts and interest at a rate equal to the higher of (a) one-month London Interbank Offered Rate (“LIBOR”) (but, in any event, not less than 0.00%) on the date the loan is made plus 0.80% per annum or (b) the Fed Funds rate (but, in any event, not less than 0.00%) in effect from time to time plus 0.80% per annum on amounts borrowed. The agreement expires in April 2022 unless extended or renewed. These fees were allocated among such funds based upon portions of the aggregate commitment available to them and relative net assets of Participating Funds. During the year ended December 31, 2021, the Series did not borrow under the credit agreement.

10. PRINCIPAL RISKS

In the normal course of business, the Series invests in securities or other instruments and may enter into certain transactions, and such activities subject the Series to various risks, including among others, fluctuations in the market (market risk) or failure of an issuer to meet all of its obligations. The value of securities or other instruments may also be affected by various factors, including, without limitation: (i) the general economy; (ii) the overall market as well as local, regional or global political and/or social instability; (iii) regulation, taxation or international tax treaties between various countries; or (iv) currency, interest rate and price fluctuations. Local, regional or global events such as war, acts of terrorism, the spread of infectious illness or other public health issues, recessions, or other events could have a significant impact on the Series and its investments. The Series’ prospectus provides details of the risks to which the Series is subject.

The Series may be exposed to additional risks when reinvesting cash collateral in money market funds that do not seek to maintain a stable NAV per share of $1.00, which may be subject to redemption gates or liquidity fees under certain circumstances.

Market Risk: An outbreak of respiratory disease caused by a novel coronavirus has developed into a global pandemic and has resulted in closing borders, quarantines, disruptions to supply chains and customer activity, as well as general concern and uncertainty. The impact of this pandemic, and other global health crises that may arise in the future, could affect the economies of many nations, individual companies and the market in general in ways that cannot necessarily be foreseen at the present time. This pandemic may result in substantial market volatility and may adversely impact the prices and liquidity of a fund’s investments. The duration of this pandemic and its effects cannot be determined with certainty.

Valuation Risk: The market values of equities, such as common stocks and preferred securities or equity related investments, such as futures and options, may decline due to general market conditions which are not specifically related to a particular company. They may also decline due to factors which affect a particular industry or industries. The Series may invest in illiquid investments. An illiquid investment is any investment that the Series reasonably expects cannot be sold or disposed of in current market conditions in seven calendar days or less without the sale or disposition significantly changing the market value of the investment. The Series may experience difficulty in selling illiquid investments in a timely manner at the price that it believes the investments are worth. Prices may fluctuate widely over short or extended periods in response to company, market or economic news. Markets also tend to move in cycles, with periods of rising and falling prices. This volatility may cause the Series’ NAV to experience significant increases or decreases over short periods of time. If there is a general decline in the securities and other markets, the NAV of the Series may lose value, regardless of the individual results of the securities and other instruments in which the Series invests.

The price the Series could receive upon the sale of any particular portfolio investment may differ from the Series’ valuation of the investment, particularly for securities that trade in thin or volatile markets or that are valued using a fair valuation technique or a price provided by an independent pricing service. Changes to significant unobservable inputs and assumptions (i.e., publicly traded company multiples, growth rate, time to exit) due to the lack of observable inputs may significantly impact the resulting fair value and therefore the Series’ results of operations. As a result, the price received upon the sale of an investment may be less than the value ascribed by the Series, and the Series could realize a greater than expected loss or lesser than expected gain upon the sale of the investment. The Series’ ability to value its investments may also be impacted by technological issues and/or errors by pricing services or other third-party service providers.

Counterparty Credit Risk: The Series may be exposed to counterparty credit risk, or the risk that an entity may fail to or be unable to perform on its commitments related to unsettled or open transactions, including making timely interest and/or principal payments or otherwise honoring its obligations. The Series manages counterparty credit risk by entering into transactions only with counterparties that the Manager believes have the financial resources to honor their obligations and by monitoring the financial stability

108 2 0 2 1   BLACK ROCK  ANNUAL  REPORT  TO  SHAREHOLDERS

Notes to Financial Statements  (continued)

of those counterparties. Financial assets, which potentially expose the Series to market, issuer and counterparty credit risks, consist principally of financial instruments and receivables due from counterparties. The extent of the Series’ exposure to market, issuer and counterparty credit risks with respect to these financial assets is approximately their value recorded in the Statement of Assets and Liabilities, less any collateral held by the Series.

A derivative contract may suffer a mark-to-market loss if the value of the contract decreases due to an unfavorable change in the market rates or values of the underlying instrument. Losses can also occur if the counterparty does not perform under the contract.

With exchange-traded futures, there is less counterparty credit risk to the Series since the exchange or clearinghouse, as counterparty to such instruments, guarantees against a possible default. The clearinghouse stands between the buyer and the seller of the contract; therefore, credit risk is limited to failure of the clearinghouse. While offset rights may exist under applicable law, the Series does not have a contractual right of offset against a clearing broker or clearinghouse in the event of a default (including the bankruptcy or insolvency). Additionally, credit risk exists in exchange-traded futures with respect to initial and variation margin that is held in a clearing broker’s customer accounts. While clearing brokers are required to segregate customer margin from their own assets, in the event that a clearing broker becomes insolvent or goes into bankruptcy and at that time there is a shortfall in the aggregate amount of margin held by the clearing broker for all its clients, typically the shortfall would be allocated on a pro rata basis across all the clearing broker’s customers, potentially resulting in losses to the Series.

Concentration Risk: A diversified portfolio, where this is appropriate and consistent with a fund’s objectives, minimizes the risk that a price change of a particular investment will have a material impact on the NAV of a fund. The investment concentrations within the Series’ portfolio are disclosed in its Schedule of Investments.

LIBOR Transition Risk: The United Kingdom’s Financial Conduct Authority announced a phase out of the LIBOR. Although many LIBOR rates will cease to be published or no longer will be representative of the underlying market they seek to measure after December 31, 2021, a selection of widely used USD LIBOR rates will continue to be published through June 2023 in order to assist with the transition. The Series may be exposed to financial instruments tied to LIBOR to determine payment obligations, financing terms, hedging strategies or investment value. The transition process away from LIBOR might lead to increased volatility and illiquidity in markets for, and reduce the effectiveness of new hedges placed against instruments whose terms currently include LIBOR. The ultimate effect of the LIBOR transition process on the Series is uncertain.

11. SUBSEQUENT EVENTS

Management has evaluated the impact of all subsequent events on the Series through the date the financial statements were issued and has determined that there were no subsequent events requiring adjustment or additional disclosure in the financial statements.

SERIES    NOTES  TO  FINANCIAL  STATEMENTS 109

Report of Independent Registered Public Accounting Firm

To the Investors of Master Small Cap Index Series and the Board of Directors of Quantitative Master Series LLC:

Opinion on the Financial Statements and Financial Highlights

We have audited the accompanying statement of assets and liabilities of Master Small Cap Index Series of Quantitative Master Series LLC (the “Fund”), including the schedule of investments, as of December 31, 2021, the related statement of operations for the year then ended, the statements of changes in net assets for each of the two years in the period then ended, the financial highlights for each of the five years in the period then ended, and the related notes. In our opinion, the financial statements and financial highlights present fairly, in all material respects, the financial position of the Fund as of December 31, 2021, and the results of its operations for the year then ended, the changes in its net assets for each of the two years in the period then ended, and the financial highlights for each of the five years in the period then ended, in conformity with accounting principles generally accepted in the United States of America.

Basis for Opinion

These financial statements and financial highlights are the responsibility of the Fund’s management. Our responsibility is to express an opinion on the Fund’s financial statements and financial highlights based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Fund in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements and financial highlights are free of material misstatement, whether due to error or fraud. The Fund is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part of our audits we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of the Fund’s internal control over financial reporting. Accordingly, we express no such opinion.

Our audits included performing procedures to assess the risks of material misstatement of the financial statements and financial highlights, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements and financial highlights. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements and financial highlights. Our procedures included confirmation of securities owned as of December 31, 2021, by correspondence with the custodian and brokers; when replies were not received from brokers, we performed other auditing procedures. We believe that our audits provide a reasonable basis for our opinion.

Deloitte & Touche LLP

Boston, Massachusetts

February 24, 2022

We have served as the auditor of one or more BlackRock investment companies since 1992.

110 2 0 2 1   BLACK ROCK  ANNUAL  REPORT  TO  SHAREHOLDERS

Statement Regarding Liquidity Risk Management Program

In compliance with Rule 22e-4 under the Investment Company Act of 1940, as amended (the “Liquidity Rule”), BlackRock Funds^SM (the “Trust”), BlackRock Index Funds, Inc. and Quantitative Master Series LLC (the “Corporations”) have adopted and implemented a liquidity risk management program (the “Program”) for iShares Municipal Bond Index Fund, iShares Short-Term TIPS Bond Index Fund, iShares MSCI EAFE International Index Fund, iShares Russell 2000 Small-Cap Index Fund and Master Small Cap Index Series (the “Funds”), each a series of the Trust or the respective Corporation, which is reasonably designed to assess and manage each Fund’s liquidity risk.

The Board of Directors (the “Board”) of the Corporations, on behalf of the Funds, met on November 9-10, 2021 (the “Meeting”) to review the Program. The Board previously appointed BlackRock Advisors, LLC or BlackRock Fund Advisors (“BlackRock”), each an investment adviser to certain BlackRock funds, as the program administrator for each Fund’s Program, as applicable. BlackRock also previously delegated oversight of the Program to the 40 Act Liquidity Risk Management Committee (the “Committee”). At the Meeting, the Committee, on behalf of BlackRock, provided the Board with a report that addressed the operation of the Program and assessed its adequacy and effectiveness of implementation, including the management of each Fund’s Highly Liquid Investment Minimum (“HLIM”) where applicable, and any material changes to the Program (the “Report”). The Report covered the period from October 1, 2020 through September 30, 2021 (the “Program Reporting Period”).

The Report described the Program’s liquidity classification methodology for categorizing each Fund’s investments (including derivative transactions) into one of four liquidity buckets. It also referenced the methodology used by BlackRock to establish each Fund’s HLIM and noted that the Committee reviews and ratifies the HLIM assigned to each Fund no less frequently than annually. The Report also discussed notable events affecting liquidity over the Program Reporting Period, including the imposition of capital controls in certain countries.

The Report noted that the Program complied with the key factors for consideration under the Liquidity Rule for assessing, managing and periodically reviewing each Fund’s liquidity risk, as follows:

a) The Fund’s investment strategy and liquidity of portfolio investments during both normal and reasonably foreseeable stressed conditions. During the Program Reporting Period, the Committee reviewed whether each Fund’s strategy is appropriate for an open-end fund structure with a focus on funds with more significant and consistent holdings of less liquid and illiquid assets. The Committee also factored a fund’s concentration in an issuer into the liquidity classification methodology by taking issuer position sizes into account. Where a fund participated in borrowings for investment purposes (such as tender option bonds or reverse repurchase agreements), such borrowings were factored into the Program’s calculation of a fund’s liquidity bucketing. Derivative exposure was also considered in such calculation.

b) Short-term and long-term cash flow projections during both normal and reasonably foreseeable stressed conditions. During the Program Reporting Period, the Committee reviewed historical redemption activity and used this information as a component to establish each Fund’s reasonably anticipated trading size (“RATS”). Each Fund has adopted an in-kind redemption policy which may be utilized to meet larger redemption requests. The Committee may also take into consideration a fund’s shareholder ownership concentration (which, depending on product type and distribution channel, may or may not be available), a fund’s distribution channels, and the degree of certainty associated with a fund’s short-term and long-term cash flow projections.

c) Holdings of cash and cash equivalents, as well as borrowing arrangements. The Committee considered the terms of the credit facility committed to each Fund, the financial health of the institution providing the facility and the fact that the credit facility is shared among multiple funds (including that a portion of the aggregate commitment amount is specifically designated for BlackRock Floating Rate Income Portfolio, a series of BlackRock Funds V). The Committee also considered other types of borrowing available to the Funds, such as the ability to use reverse repurchase agreements and interfund lending, as applicable.

There were no material changes to the Program during the Program Reporting Period other than the enhancement of certain model components in the Program’s methodology. The Report provided to the Board stated that the Committee concluded that based on the operation of the functions, as described in the Report, the Program is operating as intended and is effective in implementing the requirements of the Liquidity Rule.

STATEMENT  REGARDING   LIQUIDITY   RISK  MANAGEMENT   PROGRAM 111

Director and Officer Information  

Independent Directors(a)
Name Year of Birth(b)	Position(s) Held (Length of Service)(c)	Principal Occupation(s) During Past Five Years	Number of BlackRock-Advised Registered Investment Companies (“RICs”) Consisting of Investment Portfolios (“Portfolios”) Overseen	Public Company and Other Investment Company Directorships Held During Past Five Years
Mark Stalnecker 1951	Chair of the Board (Since 2019) and Director (Since 2015)	Chief Investment Officer, University of Delaware from 1999 to 2013; Trustee and Chair of the Finance and Investment Committees, Winterthur Museum and Country Estate from 2005 to 2016; Member of the Investment Committee, Delaware Public Employees’ Retirement System since 2002; Member of the Investment Committee, Christiana Care Health System from 2009 to 2017; Member of the Investment Committee, Delaware Community Foundation from 2013 to 2014; Director and Chair of the Audit Committee, SEI Private Trust Co. from 2001 to 2014.	30 RICs consisting of 159 Portfolios	None
Bruce R. Bond 1946	Director (Since 2019)	Board Member, Amsphere Limited (software) since 2018; Trustee and Member of the Governance Committee, State Street Research Mutual Funds from 1997 to 2005; Board Member of Governance, Audit and Finance Committee, Avaya Inc. (computer equipment) from 2003 to 2007.	30 RICs consisting of 159 Portfolios	None
Susan J. Carter 1956	Director (Since 2016)	Director, Pacific Pension Institute from 2014 to 2018; Advisory Board Member, Center for Private Equity and Entrepreneurship at Tuck School of Business since 1997; Senior Advisor, Commonfund Capital, Inc. (“CCI”) (investment adviser) in 2015; Chief Executive Officer, CCI from 2013 to 2014; President & Chief Executive Officer, CCI from 1997 to 2013; Advisory Board Member, Girls Who Invest from 2015 to 2018 and Board Member thereof since 2018; Advisory Board Member, Bridges Fund Management since 2016; Trustee, Financial Accounting Foundation since 2017; Practitioner Advisory Board Member, Private Capital Research Institute (“PCRI”) since 2017; Lecturer in the Practice of Management, Yale School of Management since 2019; Advisor to Finance Committee, Altman Foundation since 2020.	30 RICs consisting of 159 Portfolios	None
Collette Chilton 1958	Director (Since 2015)	Chief Investment Officer, Williams College since 2006; Chief Investment Officer, Lucent Asset Management Corporation from 1998 to 2006; Director, Boys and Girls Club of Boston since 2017; Director, B1 Capital since 2018; Director, David and Lucile Packard Foundation since 2020.	30 RICs consisting of 159 Portfolios	None
Neil A. Cotty 1954	Director (Since 2016)	Bank of America Corporation from 1996 to 2015, serving in various senior finance leadership roles, including Chief Accounting Officer from 2009 to 2015, Chief Financial Officer of Global Banking, Markets and Wealth Management from 2008 to 2009, Chief Accounting Officer from 2004 to 2008, Chief Financial Officer of Consumer Bank from 2003 to 2004, Chief Financial Officer of Global Corporate Investment Bank from 1999 to 2002.	30 RICs consisting of 159 Portfolios	None
Lena G. Goldberg 1949	Director (Since 2019)	Director, Charles Stark Draper Laboratory, Inc. since 2013; Senior Lecturer, Harvard Business School, from 2008 to 2021; FMR LLC/Fidelity Investments (financial services) from 1996 to 2008, serving in various senior roles including Executive Vice President - Strategic Corporate Initiatives and Executive Vice President and General Counsel; Partner, Sullivan & Worcester LLP from 1985 to 1996 and Associate thereof from 1979 to 1985.	30 RICs consisting of 159 Portfolios	None

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Director and Officer Information  (continued)

Independent Directors(a) (continued)
Name Year of Birth(b)	Position(s) Held (Length of Service)(c)	Principal Occupation(s) During Past Five Years	Number of BlackRock-Advised Registered Investment Companies (“RICs”) Consisting of Investment Portfolios (“Portfolios”) Overseen	Public Company and Other Investment Company Directorships Held During Past Five Years
Henry R. Keizer 1956	Director (Since 2019)	Director, Park Indemnity Ltd. (captive insurer) since 2010; Director, MUFG Americas Holdings Corporation and MUFG Union Bank, N.A. (financial and bank holding company) from 2014 to 2016; Director, American Institute of Certified Public Accountants from 2009 to 2011; Director, KPMG LLP (audit, tax and advisory services) from 2004 to 2005 and 2010 to 2012; Director, KPMG International in 2012, Deputy Chairman and Chief Operating Officer thereof from 2010 to 2012 and U.S. Vice Chairman of Audit thereof from 2005 to 2010; Global Head of Audit, KPMGI (consortium of KPMG firms) from 2006 to 2010; Director, YMCA of Greater New York from 2006 to 2010.	30 RICs consisting of 159 Portfolios	Hertz Global Holdings (car rental); Sealed Air Corp. (packaging); GrafTech International Ltd. (materials manufacturing); Montpelier Re Holdings, Ltd. (publicly held property and casualty reinsurance) from 2013 to 2015; WABCO (commercial vehicle safety systems) from 2015 to 2020.
Cynthia A. Montgomery 1952	Director (Since 2007)	Professor, Harvard Business School since 1989.	30 RICs consisting of 159 Portfolios	Newell Rubbermaid, Inc. (manufacturing) from 1995 to 2016.
Donald C. Opatrny 1952	Director (Since 2019)	Trustee, Vice Chair, Member of the Executive Committee and Chair of the Investment Committee, Cornell University from 2004 to 2019; President, Trustee and Member of the Investment Committee, The Aldrich Contemporary Art Museum from 2007 to 2014; Member of the Board and Investment Committee, University School from 2007 to 2018; Member of the Investment Committee, Mellon Foundation from 2009 to 2015; Trustee, Artstor (a Mellon Foundation affiliate) from 2010 to 2015; President and Trustee, the Center for the Arts, Jackson Hole from 2011 to 2018; Director, Athena Capital Advisors LLC (investment management firm) since 2013; Trustee and Chair of the Investment Committee, Community Foundation of Jackson Hole since 2014; Member of Affordable Housing Supply Board of Jackson, Wyoming since 2017; Member, Investment Funds Committee, State of Wyoming since 2017; Trustee, Phoenix Art Museum since 2018; Trustee, Arizona Community Foundation and Member of Investment Committee since 2020.	30 RICs consisting of 159 Portfolios	None
Joseph P. Platt 1947	Director (Since 2007)	General Partner, Thorn Partners, LP (private investments) since 1998; Director, WQED Multi-Media (public broadcasting not-for-profit) since 2001; Chair, Basic Health International (non-profit) since 2015.	30 RICs consisting of 159 Portfolios	Greenlight Capital Re, Ltd. (reinsurance company); Consol Energy Inc.

DIRECTOR   AND  OFFICER  INFORMATION 113

Director and Officer Information  (continued)

Independent Directors(a) (continued)
Name Year of Birth(b)	Position(s) Held (Length of Service)(c)	Principal Occupation(s) During Past Five Years	Number of BlackRock-Advised Registered Investment Companies (“RICs”) Consisting of Investment Portfolios (“Portfolios”) Overseen	Public Company and Other Investment Company Directorships Held During Past Five Years
Kenneth L. Urish 1951	Director (Since 2007)	Managing Partner, Urish Popeck & Co., LLC (certified public accountants and consultants) since 1976; Past- Chairman of the Professional Ethics Committee of the Pennsylvania Institute of Certified Public Accountants and Committee Member thereof since 2007; Member of External Advisory Board, The Pennsylvania State University Accounting Department since founding in 2001; Principal, UP Strategic Wealth Investment Advisors, LLC since 2013; Trustee, The Holy Family Institute from 2001 to 2010; President and Trustee, Pittsburgh Catholic Publishing Associates from 2003 to 2008; Director, Inter- Tel from 2006 to 2007; Member, Advisory Board, ESG Competent Boards since 2020.	30 RICs consisting of 159 Portfolios	None
Claire A. Walton 1957	Director (Since 2016)	Chief Operating Officer and Chief Financial Officer of Liberty Square Asset Management, LP from 1998 to 2015; General Partner of Neon Liberty Capital Management, LLC since 2003; Director, Boston Hedge Fund Group from 2009 to 2018; Director, Woodstock Ski Runners since 2013; Director, Massachusetts Council on Economic Education from 2013 to 2015.	30 RICs consisting of 159 Portfolios	None

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Director and Officer Information  (continued)

Interested Directors(a)(d)
Name Year of Birth(b)	Position(s) Held (Length of Service)(c)	Principal Occupation(s) During Past Five Years	Number of BlackRock-Advised Registered Investment Companies (“RICs”) Consisting of Investment Portfolios (“Portfolios”) Overseen	Public Company and Other Investment Company Directorships Held During Past Five Years
Robert Fairbairn 1965	Director (Since 2018)	Vice Chairman of BlackRock, Inc. since 2019; Member of BlackRock’s Global Executive and Global Operating Committees; Co-Chair of BlackRock’s Human Capital Committee; Senior Managing Director of BlackRock, Inc. from 2010 to 2019; oversaw BlackRock’s Strategic Partner Program and Strategic Product Management Group from 2012 to 2019; Member of the Board of Managers of BlackRock Investments, LLC from 2011 to 2018; Global Head of BlackRock’s Retail and iShares® businesses from 2012 to 2016.	103 RICs consisting of 261 Portfolios	None
John M. Perlowski(e) 1964	Director (Since 2015) President and Chief Executive Officer (Since 2010)	Managing Director of BlackRock, Inc. since 2009; Head of BlackRock Global Accounting and Product Services since 2009; Advisory Director of Family Resource Network (charitable foundation) since 2009.	105 RICs consisting of 263 Portfolios	None
(a)  The address of each Director is c/o BlackRock, Inc., 55 East 52nd Street, New York, New York 10055. (b)  Independent Directors serve until their resignation, retirement, removal or death, or until December 31 of the year in which they turn 75. The Board may determine to extend the terms of Independent Directors on a case-by-case basis, as appropriate. (c)  Following the combination of Merrill Lynch Investment Managers, L.P. (“MLIM”) and BlackRock, Inc. in September 2006, the various legacy MLIM and legacy BlackRock fund boards were realigned and consolidated into three new fund boards in 2007. Furthermore, effective January 1, 2019, three BlackRock Fund Complexes were realigned and consolidated into two BlackRock Fund Complexes. As a result, although the chart shows the year that each Independent Director joined the Board, certain Independent Directors first became members of the boards of other BlackRock-advised Funds, legacy MLIM funds or legacy BlackRock funds as follows: Bruce R. Bond, 2005; Cynthia A. Montgomery, 1994; Joseph P. Platt, 1999; Kenneth L. Urish, 1999; Lena G. Goldberg, 2016; Henry R. Keizer, 2016; Donald C. Opatrny, 2015. (d)  Mr. Fairbairn and Mr. Perlowski are both “interested persons,” as defined in the 1940 Act, of the Trust/Corporations based on their positions with BlackRock, Inc. and its affiliates. Mr. Fairbairn and Mr. Perlowski are also board members of the BlackRock Fixed-Income Complex. (e)  Mr.  Perlowski is also a trustee of the BlackRock Credit Strategies Fund and BlackRock Private Investments Fund.
Officers Who Are Not Directors(a)
Name Year of Birth(b)	Position(s) Held (Length of Service)	Principal Occupation(s) During Past Five Years
Thomas Callahan 1968	Vice President (Since 2016)	Managing Director of BlackRock, Inc. since 2013; Member of the Board of Managers of BlackRock Investments, LLC (principal underwriter) since 2019 and Managing Director thereof since 2017; Head of BlackRock’s Global Cash Management Business since 2016; Co-Head of the Global Cash Management Business from 2014 to 2016; Deputy Head of the Global Cash Management Business from 2013 to 2014; Member of the Cash Management Group Executive Committee since 2013; Chief Executive Officer of NYSE Liffe U.S. from 2008 to 2013.
Jennifer McGovern 1977	Vice President (Since 2014)	Managing Director of BlackRock, Inc. since 2016; Director of BlackRock, Inc. from 2011 to 2015; Head of Americas Product Development and Governance for BlackRock’s Global Product Group since 2019; Head of Product Structure and Oversight for BlackRock’s U.S. Wealth Advisory Group from 2013 to 2019.
Trent Walker 1974	Chief Financial Officer (Since 2021)	Managing Director of BlackRock, Inc. since September 2019; Executive Vice President of PIMCO from 2016 to 2019; Senior Vice President of PIMCO from 2008 to 2015; Treasurer from 2013 to 2019 and Assistant Treasurer from 2007 to 2017 of PIMCO Funds, PIMCO Variable Insurance Trust, PIMCO ETF Trust, PIMCO Equity Series, PIMCO Equity Series VIT, PIMCO Managed Accounts Trust, 2 PIMCO-sponsored interval funds and 21 PIMCO-sponsored closed-end funds.
Jay M. Fife 1970	Treasurer (Since 2007)	Managing Director of BlackRock, Inc. since 2007.
Charles Park 1967	Chief Compliance Officer (Since 2014)	Anti-Money Laundering Compliance Officer for certain BlackRock-advised Funds from 2014 to 2015; Chief Compliance Officer of BlackRock Advisors, LLC and the BlackRock-advised Funds in the BlackRock Multi-Asset Complex and the BlackRock Fixed-Income Complex since 2014; Principal of and Chief Compliance Officer for iShares® Delaware Trust Sponsor LLC since 2012 and BlackRock Fund Advisors (“BFA”) since 2006; Chief Compliance Officer for the BFA-advised iShares® exchange traded funds since 2006; Chief Compliance Officer for BlackRock Asset Management International Inc. since 2012.

DIRECTOR   AND  OFFICER  INFORMATION 115

Director and Officer Information  (continued)

Officers Who Are Not Directors(a) (continued)
Name Year of Birth(b)	Position(s) Held (Length of Service)	Principal Occupation(s) During Past Five Years
Lisa Belle 1968	Anti-Money Laundering Compliance Officer (Since 2019)	Managing Director of BlackRock, Inc. since 2019; Global Financial Crime Head for Asset and Wealth Management of JP Morgan from 2013 to 2019; Managing Director of RBS Securities from 2012 to 2013; Head of Financial Crimes for Barclays Wealth Americas from 2010 to 2012.
Janey Ahn 1975	Secretary (Since 2019)	Managing Director of BlackRock, Inc. since 2018; Director of BlackRock, Inc. from 2009 to 2017.
(a)  The address of each Officer is c/o BlackRock, Inc., 55 East 52nd Street, New York, New York 10055. (b)  Officers of the Trust/Corporation serve at the pleasure of the Board.

Further information about the Trust’s/Corporations’ Directors and Officers is available in the Trust’s/Corporations’ Statement of Additional Information, which can be obtained without charge by calling (800) 441-7762.

Effective December 31, 2021, Bruce R. Bond retired as a Director of the Trust/Corporation.

116 2 0 2 1   BLACK ROCK  ANNUAL  REPORT  TO  SHAREHOLDERS

Additional Information  

Regulation Regarding Derivatives

On October 28, 2020, the Securities and Exchange Commission (the “SEC”) adopted regulations governing the use of derivatives by registered investment companies (“Rule 18f-4”). The Funds will be required to implement and comply with Rule 18f-4 by August 19, 2022. Once implemented, Rule 18f-4 will impose limits on the amount of derivatives a fund can enter into, eliminate the asset segregation framework currently used by funds to comply with Section 18 of the 1940 Act, treat derivatives as senior securities and require funds whose use of derivatives is more than a limited specified exposure amount to establish and maintain a comprehensive derivatives risk management program and appoint a derivatives risk manager.

Dividend Policy

Each Fund’s dividend policy is to distribute all or a portion of its net investment income to its shareholders on a monthly/quarterly basis. In order to provide shareholders with a more stable level of dividend distributions, the distributions paid by a Fund for any particular month/quarter may be more or less than the amount of net investment income earned by a Fund during such month/quarter. The portion of distributions that exceeds a Fund current and accumulated earnings and profits, which are measured on a tax basis, will constitute a nontaxable return of capital. The Funds’ current accumulated but undistributed net investment income, if any, is disclosed as accumulated earnings (loss) in the Statements of Assets and Liabilities, which comprises part of the financial information included in this report.

General Information

Quarterly performance, semi-annual and annual reports, current net asset value and other information regarding the Funds may be found on BlackRock’s website, which can be accessed at blackrock.com. Any reference to BlackRock’s website in this report is intended to allow investors public access to information regarding the Funds and does not, and is not intended to, incorporate BlackRock’s website in this report.

Householding

The Funds will mail only one copy of shareholder documents, including prospectuses, annual and semi-annual reports, Rule 30e-3 notices and proxy statements, to shareholders with multiple accounts at the same address. This practice is commonly called “householding” and is intended to reduce expenses and eliminate duplicate mailings of shareholder documents. Mailings of your shareholder documents may be householded indefinitely unless you instruct us otherwise. If you do not want the mailing of these documents to be combined with those for other members of your household, please call the Funds at (800) 441-7762.

Availability of Quarterly Schedule of Investments

The Funds file their complete schedules of portfolio holdings with the SEC for the first and third quarters of each fiscal year as an exhibit to their reports on Form N-PORT. The Funds’ Forms N-PORT are available on the SEC’s website at sec.gov. Additionally, each Fund makes its portfolio holdings for the first and third quarters of each fiscal year available at blackrock.com/fundreports.

Availability of Proxy Voting Policies, Procedures and Voting Records

A description of the policies and procedures that the Funds use to determine how to vote proxies relating to portfolio securities and information about how the Funds voted proxies relating to securities held in the Funds’ portfolios during the most recent 12-month period ended June 30 is available without charge, upon request (1) by calling (800) 441-7762; (2) on the BlackRock website at blackrock.com; and (3) on the SEC’s website at sec.gov.

BlackRock’s Mutual Fund Family

BlackRock offers a diverse lineup of open-end mutual funds crossing all investment styles and managed by experts in equity, fixed-income and tax-exempt investing. Visit blackrock.com for more information.

Shareholder Privileges

Account Information

Call us at (800) 441-7762 from 8:00 AM to 6:00 PM ET on any business day to get information about your account balances, recent transactions and share prices. You can also visit blackrock.com for more information.

Automatic Investment Plans

Investor class shareholders who want to invest regularly can arrange to have $50 or more automatically deducted from their checking or savings account and invested in any of the BlackRock funds.

ADDITIONAL  INFORMATION 117

Additional Information  (continued)

Systematic Withdrawal Plans

Investor class shareholders can establish a systematic withdrawal plan and receive periodic payments of $50 or more from their BlackRock funds, as long as their account balance is at least $10,000.

Retirement Plans

Shareholders may make investments in conjunction with Traditional, Rollover, Roth, Coverdell, Simple IRAs, SEP IRAs and 403(b) Plans.

BlackRock Privacy Principles

BlackRock is committed to maintaining the privacy of its current and former fund investors and individual clients (collectively, “Clients”) and to safeguarding their non-public personal information. The following information is provided to help you understand what personal information BlackRock collects, how we protect that information and why in certain cases we share such information with select parties.

If you are located in a jurisdiction where specific laws, rules or regulations require BlackRock to provide you with additional or different privacy-related rights beyond what is set forth below, then BlackRock will comply with those specific laws, rules or regulations.

BlackRock obtains or verifies personal non-public information from and about you from different sources, including the following: (i) information we receive from you or, if applicable, your financial intermediary, on applications, forms or other documents; (ii) information about your transactions with us, our affiliates, or others; (iii) information we receive from a consumer reporting agency; and (iv) from visits to our websites.

BlackRock does not sell or disclose to non-affiliated third parties any non-public personal information about its Clients, except as permitted by law or as is necessary to respond to regulatory requests or to service Client accounts. These non-affiliated third parties are required to protect the confidentiality and security of this information and to use it only for its intended purpose.

We may share information with our affiliates to service your account or to provide you with information about other BlackRock products or services that may be of interest to you. In addition, BlackRock restricts access to non-public personal information about its Clients to those BlackRock employees with a legitimate business need for the information. BlackRock maintains physical, electronic and procedural safeguards that are designed to protect the non-public personal information of its Clients, including procedures relating to the proper storage and disposal of such information.

Fund and Service Providers

Investment Adviser and Administrator^(a)

BlackRock Advisors, LLC

Wilmington, DE 19809

Investment Adviser ^(b)

BlackRock Fund Advisors

San Francisco, CA 94105

Sub-Adviser

BlackRock International Limited

Edinburgh, EH3 8BL

United Kingdom

Accounting Agent and Custodian

State Street Bank and Trust Company

Boston, MA 02111

Transfer Agent

BNY Mellon Investment Servicing (US) Inc.

Wilmington, DE 19809

Distributor

BlackRock Investments, LLC

New York, NY 10022

Independent Registered Public Accounting Firm

Deloitte & Touche LLP

Boston, MA 02116

Legal Counsel

Sidley Austin LLP

New York, NY 10019

Address of the Funds/Corporation/Master LLC

100 Bellevue Parkway

Wilmington, DE 19809

^(a) Administrator to iShares Russell 2000 Small-Cap Index Fund and iShares MSCI

EAFE International Index Fund.

^(b) For iShares Municipal Bond Index Fund.

118 2 0 2 1   BLACK ROCK  ANNUAL  REPORT  TO  SHAREHOLDERS

Glossary of Terms Used in this Report  

Portfolio Abbreviation
ADR	American Depositary Receipt
AGC	Assured Guaranty Corp.
AGM	Assured Guaranty Municipal Corp.
AMBAC	AMBAC Assurance Corp.
AMT	Alternative Minimum Tax
ARB	Airport Revenue Bonds
CAB	Capital Appreciation Bonds
COP	Certificates of Participation
ETF	Exchange-Traded Fund
FTSE	Financial Times Stock Exchange
GO	General Obligation Bonds
PSF	Permanent School Fund
RB	Revenue Bond
REIT	Real Estate Investment Trust
SAP	Subject to Appropriations
SAW	State Aid Withholding
SCA	Societe en Commandite par Actions

GLOSSARY  OF  TERMS   USED  IN  THIS  REPORT 119

Want to know more?

blackrock.com | 800-441-7762

This report is intended for current holders. It is not authorized for use as an offer of sale or a solicitation of an offer to buy shares of the Funds unless preceded or accompanied by the Fund’s current prospectus. Past performance results shown in this report should not be considered a representation of future performance. Investment returns and principal value of shares will fluctuate so that shares, when redeemed, may be worth more or less than their original cost. Statements and other information herein are as dated and are subject to change.

iSIndex-12/21-AR

          

(b) Not Applicable

Item 2 – Code of Ethics – Each registrant (or each, a “Fund”) has adopted a code of ethics, as of the end of the period covered by this report, applicable to the registrants’ principal executive officer, principal financial officer, principal accounting officer or controller, or persons performing similar functions. During the period covered by this report, the code of ethics was amended to update certain information and to make other non-material changes. During the period covered by this report, there have been no waivers granted under the code of ethics. The registrants undertake to provide a copy of the code of ethics to any person upon request, without charge, who calls 1-800-441-7762.

Item 3 – Audit Committee Financial Expert – Each registrant’s board of directors (the “board of directors”), has determined that (i) the registrant has the following audit committee financial experts serving on its audit committee and (ii) each audit committee financial expert is independent:

Neil A. Cotty

Henry R. Keizer

Kenneth L. Urish

Under applicable securities laws, a person determined to be an audit committee financial expert will not be deemed an “expert” for any purpose, including without limitation for the purposes of Section 11 of the Securities Act of 1933, as a result of being designated or identified as an audit committee financial expert. The designation or identification of a person as an audit committee financial expert does not impose on such person any duties, obligations, or liabilities greater than the duties, obligations, and liabilities imposed on such person as a member of the audit committee and board of directors in the absence of such designation or identification. The designation or identification of a person as an audit committee financial expert does not affect the duties, obligations, or liability of any other member of the audit committee or board of directors.

Item 4 – Principal Accountant Fees and Services

The following table presents fees billed by Deloitte & Touche LLP (“D&T”) in each of the last two fiscal years for the services rendered to the Funds:

	(a) Audit Fees		(b) Audit-Related Fees1		(c) Tax Fees2		(d) All Other Fees
Entity Name	Current   Fiscal   Year   End	Previous   Fiscal   Year   End	Current   Fiscal   Year   End	Previous   Fiscal Year End	Current   Fiscal   Year   End	Previous   Fiscal   Year   End	Current   Fiscal   Year   End	Previous   Fiscal   Year   End
iShares MSCI EAFE International Index Fund of BlackRock Index Funds, Inc.	$32,623	$33,660	$207	$0	$16,400	$15,800	$0	$0
iShares Russell 2000 Small-Cap Index Fund of BlackRock Index Funds, Inc.	$7,878	$8,160	$207	$0	$23,500	$23,200	$0	$0
Master Small Cap Index Series of Quantitative Master Series LLC	$28,482	$29,376	$207	$0	$16,800	$16,800	$0	$0

The following table presents fees billed by D&T that were required to be approved by each registrant’s audit committee (each a “Committee”) for services that relate directly to the operations or financial reporting of each Fund

and that are rendered on behalf of BlackRock Advisors, LLC (the “Investment Adviser” or “BlackRock”)and entities controlling, controlled by, or under common control with BlackRock (not including any sub-adviser whose role is primarily portfolio management and is subcontracted with or overseen by another investment adviser) that provide ongoing services to each Fund (“Affiliated Service Providers”):

	Current Fiscal Year End	Previous Fiscal Year End
(b) Audit-Related Fees1	$0	$0
(c) Tax Fees2	$0	$0
(d) All Other Fees3	$2,032,000	$1,984,000

¹ The nature of the services includes assurance and related services reasonably related to the performance of the audit or review of financial statements not included in Audit Fees, including accounting consultations, agreed-upon procedure reports, attestation reports, comfort letters, out-of-pocket expenses and internal control reviews not required by regulators.

² The nature of the services includes tax compliance and/or tax preparation, including services relating to the filing or amendment of federal, state or local income tax returns, regulated investment company qualification reviews, taxable income and tax distribution calculations.

³ Non-audit fees of $2,032,000 and $1,984,000 for the current fiscal year and previous fiscal year, respectively, were paid to each Fund’s principal accountant in their entirety by BlackRock, in connection with services provided to the Affiliated Service Providers of each Fund and of certain other funds sponsored and advised by BlackRock or its affiliates for a service organization review and an accounting research tool subscription. These amounts represent aggregate fees paid by BlackRock and were not allocated on a per fund basis.

(e)(1) Audit Committee Pre-Approval Policies and Procedures:

Each Committee has adopted policies and procedures with regard to the pre-approval of services. Audit, audit-related and tax compliance services provided to the registrant on an annual basis require specific pre-approval by the Committee. The Committee also must approve other non-audit services provided to the registrant and those non-audit services provided to the Investment Adviser and Affiliated Service Providers that relate directly to the operations and the financial reporting of the registrant. Certain of these non-audit services that the Committee believes are (a) consistent with the SEC’s auditor independence rules and (b) routine and recurring services that will not impair the independence of the independent accountants may be approved by the Committee without consideration on a specific case-by-case basis (“general pre-approval”). The term of any general pre-approval is 12 months from the date of the pre-approval, unless the Committee provides for a different period. Tax or other non-audit services provided to the registrants which have a direct impact on the operations or financial reporting of the registrant will only be deemed pre-approved provided that any individual project does not exceed $10,000 attributable to the registrant or $50,000 per project. For this purpose, multiple projects will be aggregated to determine if they exceed the previously mentioned cost levels.

Any proposed services exceeding the pre-approved cost levels will require specific pre-approval by the registrant’s Committee, as will any other services not subject to general pre-approval (e.g., unanticipated but permissible services). The Committee is informed of each service approved subject to general pre-approval at the next regularly scheduled in-person board meeting. At this meeting, an analysis of such services is presented to the Committee for ratification. The Committee may delegate to the Committee Chairman the authority to approve the provision of and fees for any specific engagement of permitted non-audit services, including services exceeding pre-approved cost levels.

(e)(2) None of the services described in each of Items 4(b) through (d) were approved by the Committee pursuant to the de minimis exception in paragraph (c)(7)(i)(C) of Rule 2-01 of Regulation S-X.

(f) Not Applicable

(g) The aggregate non-audit fees, defined as the sum of the fees shown under “Audit-Related Fees,” “Tax Fees” and “All Other Fees,” paid to the accountant for services rendered by the accountant to the registrant, the Investment Adviser and the Affiliated Service Providers were:

Entity Name	Current Fiscal Year     End	Previous Fiscal Year     End
iShares MSCI EAFE International Index Fund of BlackRock Index Funds, Inc.	$16,607	$15,800
iShares Russell 2000 Small-Cap Index Fund of BlackRock Index Funds, Inc.	$23,707	$23,200
Master Small Cap Index Series of Quantitative Master Series LLC	$17,007	$16,800

Additionally, the amounts billed by D&T in connection with services provided to the Affiliated Service Providers of the Funds and of other funds sponsored and advised by BlackRock or its affiliates during the current and previous fiscal years for a service organization review and an accounting research tool subscription were:

Current Fiscal Year End	Previous Fiscal Year End
$2,032,000	$1,984,000

These amounts represent aggregate fees paid by BlackRock and were not allocated on a per fund basis.

(h) The Committee has considered and determined that the provision of non-audit services that were rendered to the Investment Adviser and the Affiliated Service Providers that were not pre-approved pursuant to paragraph (c)(7)(ii) of Rule 2-01 of Regulation S-X is compatible with maintaining the principal accountant’s independence.

Item 5 – Audit Committee of Listed Registrants – Not Applicable

Item 6 – Investments

(a) The registrants’ Schedules of Investments are included as part of the Report to Stockholders filed under Item 1(a) of this Form.

(b) Not Applicable due to no such divestments during the semi-annual period covered since the previous Form N-CSR filing.

Item 7 – Disclosure of Proxy Voting Policies and Procedures for Closed-End Management Investment Companies – Not Applicable

Item 8 – Portfolio Managers of Closed-End Management Investment Companies – Not Applicable

Item 9 – Purchases of Equity Securities by Closed-End Management Investment Company and Affiliated Purchasers – Not Applicable

Item 10 – Submission of Matters to a Vote of Security Holders – There have been no material changes to these procedures.

Item 11 – Controls and Procedures

(a) The registrants’ principal executive and principal financial officers, or persons performing similar functions, have concluded that the registrants’ disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940, as amended (the “1940 Act”)) are effective as of a date within 90 days of the filing of this report based on the evaluation of these controls and procedures required by Rule 30a-3(b) under the 1940 Act and Rule 15d-15(b) under the Securities Exchange Act of 1934, as amended.

(b) There were no changes in the registrants’ internal control over financial reporting (as defined in Rule 30a-3(d) under the 1940 Act) that occurred during the period covered by this report that have materially affected, or are reasonably likely to materially affect, the registrants’ internal control over financial reporting.

Item 12 – Disclosure of Securities Lending Activities for Closed-End Management Investment Companies – Not Applicable

Item 13 – Exhibits attached hereto

(a)(2) Section 302 Certifications are attached

(a)(3) Any written solicitation to purchase securities under Rule 23c-1 – Not Applicable

(a)(4) Change in Registrant’s independent public accountant – Not Applicable

(b) Section 906 Certifications are attached

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, each registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

BlackRock Index Funds, Inc. and Quantitative Master Series LLC

By:	/s/ John M. Perlowski
	John M. Perlowski
	Chief Executive Officer (principal executive officer) of
	BlackRock Index Funds, Inc. and Quantitative Master Series LLC

Date: February 24, 2022

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of each registrant and in the capacities and on the dates indicated.

By:	/s/ John M. Perlowski
	John M. Perlowski
	Chief Executive Officer (principal executive officer) of
	BlackRock Index Funds, Inc. and Quantitative Master Series LLC

Date: February 24, 2022

By:	/s/ Trent Walker
	Trent Walker
	Chief Financial Officer (principal financial officer) of
	BlackRock Index Funds, Inc. and Quantitative Master Series LLC

Date: February 24, 2022