Master Investment Portfolio II 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: 811-23344 and 811-23343

Name of Fund: BlackRock Funds VI

BlackRock Advantage CoreAlpha Bond Fund

Master Investment Portfolio II

Advantage CoreAlpha Bond Master Portfolio

Fund Address: 100 Bellevue Parkway, Wilmington, DE 19809

Name and address of agent for service: John M. Perlowski, Chief Executive Officer, BlackRock Funds VI
and Master Investment Portfolio II, 50 Hudson Yards, New York, NY 10001

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

Date of fiscal year end: 12/31/2022

Date of reporting period: 12/31/2022

Item 1 – Report to Stockholders

(a) The Report to Shareholders is attached herewith.

DECEMBER 31, 2022

2022 Annual Report

BlackRock Funds VI

· BlackRock Advantage CoreAlpha Bond Fund

Not FDIC Insured • May Lose Value • No Bank Guarantee  

The Markets in Review

Dear Shareholder,

Significant economic headwinds emerged during the 12-month reporting period ended December 31, 2022, as investors navigated changing economic conditions and volatile markets. The U.S. economy shrank in the first half of 2022 before returning to modest growth in the third quarter, marking a shift to a more challenging post-reopening economic environment. Changes in consumer spending patterns and a tight labor market led to elevated inflation, which reached a 40-year high before beginning to moderate. Moreover, while the foremost effect of Russia’s invasion of Ukraine has been a severe humanitarian crisis, the ongoing war continued to present challenges for both investors and policymakers.

Equity prices fell as interest rates rose, particularly during the first half of the reporting period. Both large- and small-capitalization U.S. stocks fell, although equities began to recover in the second half of the year as inflation eased and economic growth resumed. Emerging market stocks and international equities from developed markets declined overall, pressured by rising interest rates and a strengthening U.S. dollar.

The 10-year U.S. Treasury yield rose notably during the reporting period, driving its price down, as investors reacted to fluctuating inflation data and attempted to anticipate its impact on future interest rate changes. The corporate bond market also faced inflationary headwinds, and heightened uncertainty led to higher corporate bond spreads (the difference in yield between U.S. Treasuries and similarly-dated corporate bonds).

The U.S. Federal Reserve (the “Fed”), acknowledging that inflation has been more persistent than expected, raised interest rates seven times. Furthermore, the Fed wound down its bond-buying programs and is accelerating the reduction of its balance sheet. While the Fed suggested that additional rate hikes were likely, it also gave indications that the pace of increases would slow if inflation continued to subside.

The pandemic’s restructuring of the economy brought an ongoing mismatch between supply and demand, contributing to the current inflationary regime. While growth slowed in 2022, we believe that taming inflation requires a more dramatic economic decline to bring demand back to a level more in line with the economy’s capacity. The Fed has been raising interest rates at the fastest pace in decades, and seems set to overtighten in its effort to get inflation back to target. With this in mind, we believe the possibility of a U.S. recession in the near-term is high, but this prospect has not yet been fully priced in by markets. Investors should expect a period of higher volatility as markets adjust to the new economic reality and policymakers attempt to adapt to rapidly changing conditions.

In this environment, while we favor an overweight to equities in the long-term, the market’s concerns over excessive rate hikes from central banks moderate our outlook. Rising input costs and a deteriorating economic backdrop are likely to challenge corporate earnings, so we are underweight equities overall in the near term. However, we see better opportunities in credit, where valuations are attractive and higher yields provide income opportunities. We believe that global investment-grade corporates, global inflation-linked bonds, and U.S. mortgage-backed securities offer strong opportunities for a six- to twelve-month horizon.

Overall, our view is that investors need to think globally, position themselves to be prepared for a decarbonizing economy, 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, 2022
	6-Month			12-Month
U.S. large cap equities (S&P 500® Index)		2.31	%		(18.11	)%
U.S. small cap equities (Russell 2000® Index)		3.91			(20.44	)
International equities (MSCI Europe, Australasia, Far East Index)		6.36			(14.45	)
Emerging market equities (MSCI Emerging Markets Index)		(2.99	)		(20.09	)
3-month Treasury bills (ICE BofA 3-Month U.S. Treasury Bill Index)		1.32			1.47
U.S. Treasury securities (ICE BofA 10-Year U.S. Treasury Index)		(5.58	)		(16.28	)
U.S. investment grade bonds (Bloomberg U.S. Aggregate Bond Index)		(2.97	)		(13.01	)
Tax-exempt municipal bonds (Bloomberg Municipal Bond Index)		0.50			(8.53	)
U.S. high yield bonds (Bloomberg U.S. Corporate High Yield 2% Issuer Capped Index)		3.50			(11.18	)

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	6
Disclosure of Expenses	6
Derivative Financial Instruments	7
Fund Financial Statements:
Fund Statement of Assets and Liabilities	8
Fund Statement of Operations	10
Fund Statements of Changes in Net Assets	11
Fund Financial Highlights	12
Fund Notes to Financial Statements	16
Fund Report of Independent Registered Public Accounting Firm	20
Important Tax Information	21
Master Portfolio Information	22
Master Portfolio Financial Statements:
Master Portfolio Schedule of Investments	23
Master Portfolio Statement of Assets and Liabilities	42
Master Portfolio Statement of Operations	43
Master Portfolio Statements of Changes in Net Assets	44
Master Portfolio Financial Highlights	45
Master Portfolio Notes to Financial Statements	46
Master Portfolio Report of Independent Registered Public Accounting Firm	56
Statement Regarding Liquidity Risk Management Program	57
Trustee and Officer Information	58
Additional Information	61
Glossary of Terms Used in this Report	63

3

Fund Summary  as of December 31, 2022   BlackRock Advantage CoreAlpha Bond Fund

Investment Objective

BlackRock Advantage CoreAlpha Bond Fund’s (the “Fund”) investment objective is to seek to provide a combination of income and capital growth.

Portfolio Management Commentary

How did the Fund perform?

For the 12-month period ended December 31, 2022, the Fund underperformed the benchmark, the Bloomberg U.S. Aggregate Bond Index (the “Index”).

The Fund invests all of its assets in the Advantage CoreAlpha Bond Master Portfolio (the “Master Portfolio”), a series of Master Investment Portfolio II.

What factors influenced performance?

Asset allocation was the largest detractor from performance over the period due to positioning in high yield corporate bonds, securitized assets and investment grade corporate credit. U.S. interest rate strategies also detracted from performance due to the Fund’s positioning along the U.S. Treasury curve. Credit security selection also weighed on performance due to overweights in technology and insurance and an underweight to banking.

Selection within mortgage-backed securities (“MBS”) was the principal contributor to performance over the period due to the Fund’s pool selection. Global interest rate strategies also proved additive mainly due to the Fund’s curve positioning and duration-neutral cross-market strategy.

The Master Portfolio held derivatives during the period. Futures are commonly used for strategic day-to-day interest rate hedging, tactically expressing relative value curve strategies, and duration hedging. The use of derivatives marginally detracted from performance. The Fund held a small amount of cash committed for pending transactions at period end. Cash holdings did not have a material impact on the Fund’s performance.

Describe recent portfolio activity.

Entering 2022, the Fund was constructive on credit fundamentals as default rates remained well below expansion average. That said, with the Fed expected to accelerate its tightening of monetary policy given persistent inflation the Fund tactically hedged its credit overweights both within investment grade and high yield corporate bonds and positioned its overall risk profile more neutrally. The Fund added back risk in February 2022 as credit spreads widened in anticipation of seven Fed rate hikes. Entering the second quarter of 2022, the ongoing war in Ukraine, high energy prices and the Fed’s pivot on monetary policy led to heightened uncertainty around inflation and growth along with elevated volatility. The Fund’s models began to pick up a growth shock due to China’s COVID-driven lockdowns and weaker purchasing manager index readouts. With an elevated probability of recession based on incoming hard data and several leading indicators, the Fund pared back credit risk. The Fund was neutrally positioned with respect to MBS while awaiting more clarity on the Fed’s balance sheet run-off plans and paused on adding securitized asset risk on the view that persistent inflation will eventually take its toll on consumers. Finally, the Fund was long inflation via 10-year inflation swaps.

Heading into the second half of 2022, the Fund’s signals took a more bearish turn as incoming growth data decelerated and momentum-based indicators picked up meaningful change in risk sentiment and continued inflationary pressures. Elevated inflation and uncertainty around when it would ease warranted paring credit risk to be underweight investment grade and high yield corporate bonds with the Fed committed to keeping financial conditions tight despite the associated economic costs. This defensive positioning was largely maintained into year-end on the view that credit assets would remain volatile. The Fund also began to trim securitized exposure to further reduce risk while evaluating opportunities in MBS as the Fed indicated it was not yet prepared to sell its holdings in that sector.

Describe portfolio positioning at period end.

At period end, the Fund remained underweight credit risk in view of the potential for recession but had begun to add back exposure to credit-oriented sectors based on higher yields on offer relative to recent years as well as a large amount of uninvested cash on the sidelines waiting to be deployed. The Fund was cautiously positioned with respect to securitized assets on weakness in the subprime auto sector and a lack of clarity around the strength of the consumer more broadly. The Fund’s MBS positioning reflected caution around the potential for additional interest rate volatility and further hawkish Fed rhetoric.

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 2   BLACK ROCK  ANNUAL  REPORT  TO   SHAREHOLDERS

Fund Summary  as of December 31, 2022 (continued)   BlackRock Advantage CoreAlpha Bond Fund

GROWTH OF $10,000 INVESTMENT

^(a)  Assuming maximum sales charges, transaction costs and other operating expenses, including administration fees, if any. Institutional Shares do not have a sales charge.

^(b)  The Fund invests all of its assets in the Master Portfolio. The Master Portfolio invests, under normal circumstances, at least 80% the value of the Master Portfolio’s net assets, plus the amount of any borrowing for investment purposes, in bonds. On September 17, 2018, the Fund acquired all of the assets, subject to the liabilities, of BlackRock CoreAlpha Bond Fund (the “Predecessor Fund”), a series of BlackRock Funds III, through a tax-free reorganization (the “Board Reorganization”). The Predecessor Fund is the performance and accounting survivor of the Board Reorganization.

^(c)  A broad-based flagship benchmark that measures the investment grade, U.S. dollar-denominated, fixed-rate taxable bond 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		3.52	%		3.51	%		(14.24	)%		N/A			0.03	%		N/A			1.09	%		N/A
Investor A		3.14			3.13			(14.46	)		(17.88	)%		(0.24	)		(1.05	)%		0.78			0.37	%
Investor C		2.50			2.49			(15.09	)		(15.93	)		(0.98	)		(0.98	)		0.20			0.20
Class K		3.57			3.51			(14.19	)		N/A			0.10			N/A			1.15			N/A
Bloomberg U.S. Aggregate Bond Index		—			—			(13.01	)		N/A			0.02			N/A			1.06			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 September 17, 2018, the Fund acquired all of the assets, subject to the liabilities, of BlackRock CoreAlpha Bond Fund (the “Predecessor Fund”), a series of BlackRock Funds III, through a tax-free reorganization (the “Board Reorganization”). The Predecessor Fund is the performance and accounting survivor of the Board 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 5% Return
		Beginning Account Value (07/01/22)	Ending Account Value (12/31/22)	Expenses Paid During the Period	(a)		Beginning Account Value (07/01/22)	Ending Account Value (12/31/22)	Expenses Paid During the Period	(a)	Annualized Expense Ratio
Institutional		$  1,000.00	$    971.00	$      1.39			$  1,000.00	$  1,023.79	$      1.43		0.28	%
Investor A		1,000.00	969.70	2.63			1,000.00	1,022.53	2.70		0.53
Investor C		1,000.00	967.20	6.35			1,000.00	1,018.75	6.51		1.28
Class K		1,000.00	971.30	1.14			1,000.00	1,024.05	1.17		0.23

^(a)  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.

FUND  SUMMARY 5

About Fund Performance BlackRock Advantage CoreAlpha Bond Fund

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.

Investor A Shares 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 generally available through financial intermediaries.

Investor C Shares are subject to a 1.00% CDSC if redeemed within one year of purchase. In addition, these shares are subject to a distribution fee of 0.75% per year and a service fee of 0.25% per year. These shares are generally available through financial intermediaries. These shares automatically convert to Investor A Shares after approximately eight years.

Prior to March 28, 2016 for Class K Shares, the performance of the class is based on the returns of a series of Master Investment Portfolio, adjusted to reflect the estimated annual fund fees and operating expenses of the respective share class 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 the 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 “Administrator”), the Fund’s administrator, has contractually and/or voluntarily agreed to waive and/or reimburse a portion of the Fund’s expenses. Without such waiver(s) and/or reimbursement(s), the Fund’s performance would have been lower. With respect to the Fund’s voluntary waiver(s), if any, the Administrator 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 the Fund’s contractual waiver(s), if any, the Administrator 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.

Disclosure of Expenses

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

The expense example provides 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 example also provides information about hypothetical account values and hypothetical expenses based on the 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 the Fund and other funds, compare the 5% hypothetical example with the 5% hypothetical examples that appear in shareholder reports of other funds.

The expenses shown in the expense example are intended to highlight shareholders’ ongoing costs only and do not reflect transactional expenses, such as sales charges, if any. Therefore, the hypothetical example is 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.

6 2 0 2 2   BLACK ROCK  ANNUAL  REPORT  TO   SHAREHOLDERS

Derivative Financial Instruments BlackRock Advantage CoreAlpha Bond Fund

The Advantage CoreAlpha Bond Master Portfolio (the “Master Portfolio”) 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. Pursuant to Rule 18f-4 under the 1940 Act, among other things, the Master Portfolio must either use derivative financial instruments with embedded leverage in a limited manner or comply with an outer limit on fund leverage risk based on value-at-risk. The Master Portfolio’s 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 the Master Portfolio can realize on an investment and/or may result in lower distributions paid to shareholders. The Master Portfolio’s investments in these instruments, if any, are discussed in detail in the Master Portfolio Notes to Financial Statements.

DERIVATIVE  FINANCIAL  INSTRUMENTS 7

Statement of Assets and Liabilities

December 31, 2022

	BlackRock Advantange CoreAlpha Bond Fund
ASSETS
Investments, at value — Master Portfolio	$	948,145,848
Receivables:
Capital shares sold		1,939,003
From the Administrator		2,871
Total assets		950,087,722
LIABILITIES
Payables:
Administration fees		39,961
Capital shares redeemed		1,104,994
Contributions to the Master Portfolio		834,009
Income dividend distributions		247,030
Professional fees		11,675
Service and distribution fees		69,329
Total liabilities		2,306,998
NET ASSETS	$	947,780,724
NET ASSETS CONSIST OF
Paid-in capital	$	1,140,513,081
Accumulated loss		(192,732,357	)
NET ASSETS	$	947,780,724

8 2 0 2 2   BLACK ROCK  ANNUAL  REPORT  TO   SHAREHOLDERS

Statement of Assets and Liabilities (continued)

December 31, 2022

	BlackRock Advantange CoreAlpha Bond Fund
NET ASSET VALUE
Institutional
Net assets	$	559,142,074
Shares outstanding		64,630,689
Net asset value	$	8.65
Shares authorized		Unlimited
Par value		No par value
Investor A
Net assets	$	322,124,176
Shares outstanding		37,227,569
Net asset value	$	8.65
Shares authorized		Unlimited
Par value		No par value
Investor C
Net assets	$	412,896
Shares outstanding		47,698
Net asset value	$	8.66
Shares authorized		Unlimited
Par value		No par value
Class K
Net assets	$	66,101,578
Shares outstanding		7,635,574
Net asset value	$	8.66
Shares authorized		Unlimited
Par value		No par value

See notes to financial statements.

FUND  FINANCIAL  STATEMENTS 9

Statement of Operations

Year Ended December 31, 2022

	BlackRock Advantange CoreAlpha Bond Fund
INVESTMENT INCOME
Net investment income allocated from the Master Portfolio:
Dividends — affiliated	$	1,480,573
Interest — unaffiliated		29,473,046
Securities lending income — affiliated — net		136,008
Expenses		(2,719,911	)
Fees waived		101,127
Total investment income		28,470,843
FUND EXPENSES
Service and distribution — class specific		923,570
Administration — class specific		558,233
Professional		11,069
Reorganization		6,697
Miscellaneous		2,435
Total expenses		1,502,004
Less:
Fees waived and/or reimbursed by the Administrator		(53,531	)
Total expenses after fees waived and/or reimbursed		1,448,473
Net investment income		27,022,370
REALIZED AND UNREALIZED GAIN (LOSS) ALLOCATED FROM THE MASTER PORTFOLIO
Net realized gain (loss) from:
Investments — unaffiliated		(61,862,264	)
Investments — affiliated		5,730
Forward foreign currency exchange contracts		231,650
Foreign currency transactions		(777,833	)
Futures contracts		(49,912,982	)
Swaps		(217,717	)
		(112,533,416	)
Net change in unrealized appreciation (depreciation) on:
Investments — unaffiliated		(101,102,108	)
Investments — affiliated		22,171
Forward foreign currency exchange contracts		60,057
Foreign currency translations		(8,776	)
Futures contracts		1,479,786
Swaps		(2,884,736	)
		(102,433,606	)
Net realized and unrealized loss		(214,967,022	)
NET DECREASE IN NET ASSETS RESULTING FROM OPERATIONS	$	(187,944,652)

See notes to financial statements.    

10 2 0 2 2   BLACK ROCK  ANNUAL  REPORT  TO   SHAREHOLDERS

Statements of Changes in Net Assets

	BlackRock Advantage CoreAlpha Bond Fund
	Year Ended 12/31/22			Year Ended 12/31/21
INCREASE (DECREASE) IN NET ASSETS
OPERATIONS
Net investment income	$	27,022,370		$	28,473,133
Net realized loss		(112,533,416	)		(7,058,936	)
Net change in unrealized appreciation (depreciation)		(102,433,606	)		(55,753,616	)
Net decrease in net assets resulting from operations		(187,944,652	)		(34,339,419	)
DISTRIBUTIONS TO SHAREHOLDERS(a)
From net investment income and net realized gain
Institutional		(9,065,799	)		(17,757,680	)
Investor A		(4,131,799	)		(7,897,103	)
Investor C		(1,827	)		(9,879	)
Class K		(1,202,184	)		(1,397,399	)
Return of capital
Institutional		(5,836,006	)		(4,818,445	)
Investor A		(3,229,254	)		(2,445,692	)
Investor C		(4,753	)		(6,175	)
Class K		(746,717	)		(364,559	)
Decrease in net assets resulting from distributions to shareholders		(24,218,339	)		(34,696,932	)
CAPITAL SHARE TRANSACTIONS
Net decrease in net assets derived from capital share transactions		(198,160,872	)		(248,815,746	)
NET ASSETS
Total decrease in net assets		(410,323,863	)		(317,852,097	)
Beginning of year		1,358,104,587			1,675,956,684
End of year	$	947,780,724		$	1,358,104,587

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

See notes to financial statements.

FUND  FINANCIAL  STATEMENTS 11

Financial Highlights

(For a share outstanding throughout each period)

	BlackRock Advantage CoreAlpha Bond Fund
	Institutional
	Year Ended 12/31/22			Year Ended 12/31/21			Year Ended 12/31/20			Year Ended 12/31/19			Year Ended 12/31/18
Net asset value, beginning of year	$	10.32		$	10.79		$	10.54		$	10.02		$	10.35
Net investment income(a)		0.23			0.21			0.26			0.32			0.31
Net realized and unrealized gain (loss)		(1.69	)		(0.42	)		0.67			0.64			(0.34	)
Net increase (decrease) from investment operations		(1.46	)		(0.21	)		0.93			0.96			(0.03	)
Distributions(b)
From net investment income		(0.13	)		(0.15	)		(0.56	)		(0.32	)		(0.30	)
From net realized gain		—			(0.06	)		(0.12	)		(0.12	)		(0.00	)(c)
Return of capital		(0.08	)		(0.05	)		—			—			—
Total distributions		(0.21	)		(0.26	)		(0.68	)		(0.44	)		(0.30	)
Net asset value, end of year	$	8.65		$	10.32		$	10.79		$	10.54		$	10.02
Total Return(d)
Based on net asset value		(14.24	)%		(1.98	)%		8.88	%		9.62	%		(0.18	)%
Ratios to Average Net Assets(e)(f)
Total expenses		0.29	%		0.30	%		0.28	%		0.29	%		0.37	%(g)
Total expenses after fees waived and/or reimbursed		0.29	%		0.30	%		0.28	%		0.28	%		0.35	%(g)
Net investment income		2.50	%		2.00	%		2.42	%		3.02	%		3.14	%
Supplemental Data
Net assets, end of year (000)	$	559,142		$	839,388		$	1,103,299		$	1,121,106		$	791,197
Portfolio turnover rate of the Master Portfolio(h)		205	%		219	%		410	%		263	%		331	%
(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) Includes the Fund’s share of the Master Portfolio’s allocated net expenses and/or net investment income. (f)  Excludes fees and expenses incurred indirectly as a result of investments in underlying funds. (g) Includes reorganization and board realignment and consolidation costs. Without these costs, total expenses and total expenses after fees waived and/or reimbursed would have been 0.33% and 0.31%, respectively (h) Includes mortgage dollar roll transactions (“MDRs”). Additional information regarding portfolio turnover rate is as follows:
	Year Ended 12/31/22			Year Ended 12/31/21			Year Ended 12/31/20			Year Ended 12/31/19			Year Ended 12/31/18
Portfolio turnover rate (excluding MDRs)		107	%		123	%		261	%		166	%		189	%

See notes to financial statements.    

12 2 0 2 2   BLACK ROCK  ANNUAL  REPORT  TO   SHAREHOLDERS

Financial Highlights (continued)

(For a share outstanding throughout each period)

	BlackRock Advantage CoreAlpha Bond Fund (continued)
	Investor A
	Year Ended 12/31/22			Year Ended 12/31/21			Year Ended 12/31/20			Year Ended 12/31/19			Year Ended 12/31/18
Net asset value, beginning of year	$	10.32		$	10.79		$	10.54		$	10.02		$	10.35
Net investment income(a)		0.21			0.18			0.24			0.29			0.30
Net realized and unrealized gain (loss)		(1.70	)		(0.42	)		0.66			0.64			(0.36	)
Net increase (decrease) from investment operations		(1.49	)		(0.24	)		0.90			0.93			(0.06	)
Distributions(b)
From net investment income		(0.10	)		(0.12	)		(0.53	)		(0.29	)		(0.27	)
From net realized gain		—			(0.06	)		(0.12	)		(0.12	)		(0.00	)(c)
Return of capital		(0.08	)		(0.05	)		—			—			—
Total distributions		(0.18	)		(0.23	)		(0.65	)		(0.41	)		(0.27	)
Net asset value, end of year	$	8.65		$	10.32		$	10.79		$	10.54		$	10.02
Total Return(d)
Based on net asset value		(14.46	)%		(2.23	)%		8.61	%		9.35	%		(0.52	)%
Ratios to Average Net Assets(e)(f)
Total expenses		0.54	%		0.55	%		0.53	%		0.54	%		0.56	%(g)
Total expenses after fees waived and/or reimbursed		0.54	%		0.55	%		0.53	%		0.53	%		0.53	%(g)
Net investment income		2.26	%		1.74	%		2.16	%		2.76	%		3.05	%
Supplemental Data
Net assets, end of year (000)	$	322,124		$	445,358		$	508,792		$	503,477		$	433,789
Portfolio turnover rate of the Master Portfolio(h)		205	%		219	%		410	%		263	%		331	%
(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, excludes the effects of any sales charges and assumes the reinvestment of distributions. (e) Includes the Fund’s share of the Master Portfolio’s allocated net expenses and/or net investment income. (f)  Excludes fees and expenses incurred indirectly as a result of investments in underlying funds. (g) Includes reorganization and board realignment and consolidation costs. Without these costs, total expenses and total expenses after fees waived and/or reimbursed would have been 0.52% and 0.49%, respectively. (h) Includes mortgage dollar roll transactions (“MDRs”). Additional information regarding portfolio turnover rate is as follows:
	Year Ended 12/31/22			Year Ended 12/31/21			Year Ended 12/31/20			Year Ended 12/31/19			Year Ended 12/31/18
Portfolio turnover rate (excluding MDRs)		107	%		123	%		261	%		166	%		189	%

See notes to financial statements.    

FUND  FINANCIAL  HIGHLIGHTS 13

Financial Highlights (continued)

(For a share outstanding throughout each period)

	BlackRock Advantage CoreAlpha Bond Fund (continued)
	Investor C
	Year Ended 12/31/22			Year Ended 12/31/21			Year Ended 12/31/20			Year Ended 12/31/19			Year Ended 12/31/18
Net asset value, beginning of year	$	10.33		$	10.80		$	10.55		$	10.02		$	10.36
Net investment income(a)		0.14			0.11			0.15			0.22			0.20
Net realized and unrealized gain (loss)		(1.69	)		(0.43	)		0.67			0.64			(0.35	)
Net increase (decrease) from investment operations		(1.55	)		(0.32	)		0.82			0.86			(0.15	)
Distributions(b)
From net investment income		(0.04	)		(0.04	)		(0.45	)		(0.21	)		(0.19	)
From net realized gain		—			(0.06	)		(0.12	)		(0.12	)		(0.00	)(c)
Return of capital		(0.08	)		(0.05	)		—			—			—
Total distributions		(0.12	)		(0.15	)		(0.57	)		(0.33	)		(0.19	)
Net asset value, end of year	$	8.66		$	10.33		$	10.80		$	10.55		$	10.02
Total Return(d)
Based on net asset value		(15.09	)%		(2.96	)%		7.80	%		8.64	%		(1.36	)%
Ratios to Average Net Assets(e)(f)
Total expenses		1.29	%		1.30	%		1.28	%		1.29	%		1.46	%(g)
Total expenses after fees waived and/or reimbursed		1.29	%		1.29	%		1.28	%		1.29	%		1.44	%(g)
Net investment income		1.47	%		1.01	%		1.32	%		2.08	%		2.02	%
Supplemental Data
Net assets, end of year (000)	$	413		$	865		$	1,522		$	210		$	157
Portfolio turnover rate of the Master Portfolio(h)		205	%		219	%		410	%		263	%		331	%
(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, excludes the effects of any sales charges and assumes the reinvestment of distributions. (e) Includes the Fund’s share of the Master Portfolio’s allocated net expenses and/or net investment income. (f)  Excludes fees and expenses incurred indirectly as a result of investments in underlying funds. (g) Includes reorganization and board realignment and consolidation costs. Without these costs, total expenses and total expenses after fees waived and/or reimbursed would have been 1.42% and 1.40%, respectively. (h) Includes mortgage dollar roll transactions (“MDRs”). Additional information regarding portfolio turnover rate is as follows:
	Year Ended 12/31/22			Year Ended 12/31/21			Year Ended 12/31/20			Year Ended 12/31/19			Year Ended 12/31/18
Portfolio turnover rate (excluding MDRs)		107	%		123	%		261	%		166	%		189	%

See notes to financial statements.

14 2 0 2 2   BLACK ROCK  ANNUAL  REPORT  TO   SHAREHOLDERS

Financial Highlights (continued)

(For a share outstanding throughout each period)

	BlackRock Advantage CoreAlpha Bond Fund (continued)
	Class K
	Year Ended 12/31/22			Year Ended 12/31/21			Year Ended 12/31/20			Year Ended 12/31/19			Year Ended 12/31/18
Net asset value, beginning of year	$	10.33		$	10.80		$	10.55		$	10.02		$	10.35
Net investment income(a)		0.24			0.22			0.27			0.31			0.32
Net realized and unrealized gain (loss)		(1.70	)		(0.43	)		0.66			0.66			(0.34	)
Net increase (decrease) from investment operations		(1.46	)		(0.21	)		0.93			0.97			(0.02	)
Distributions(b)
From net investment income		(0.13	)		(0.15	)		(0.56	)		(0.32	)		(0.31	)
From net realized gain		—			(0.06	)		(0.12	)		(0.12	)		(0.00	)(c)
Return of capital		(0.08	)		(0.05	)		—			—			—
Total distributions		(0.21	)		(0.26	)		(0.68	)		(0.44	)		(0.31	)
Net asset value, end of year	$	8.66		$	10.33		$	10.80		$	10.55		$	10.02
Total Return(d)
Based on net asset value		(14.19	)%		(1.93	)%		8.93	%		9.78	%		(0.14	)%
Ratios to Average Net Assets(e)(f)
Total expenses		0.29	%		0.30	%		0.28	%		0.29	%		0.33	%(g)
Total expenses after fees waived and/or reimbursed		0.24	%		0.25	%		0.23	%		0.24	%		0.30	%(g)
Net investment income		2.57	%		2.06	%		2.46	%		2.97	%		3.19	%
Supplemental Data
Net assets, end of year (000)	$	66,102		$	72,493		$	62,343		$	27,973		$	377
Portfolio turnover rate of the Master Portfolio(h)		205	%		219	%		410	%		263	%		331	%
(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) Includes the Fund’s share of the Master Portfolio’s allocated net expenses and/or net investment income. (f)  Excludes fees and expenses incurred indirectly as a result of investments in underlying funds. (g) Includes reorganization and board realignment and consolidation costs. Without these costs, total expenses and total expenses after fees waived and/or reimbursed would have been 0.29% and 0.26%, respectively. (h) Includes mortgage dollar roll transactions (“MDRs”). Additional information regarding portfolio turnover rate is as follows:
	Year Ended 12/31/22			Year Ended 12/31/21			Year Ended 12/31/20			Year Ended 12/31/19			Year Ended 12/31/18
Portfolio turnover rate (excluding MDRs)		107	%		123	%		261	%		166	%		189	%

See notes to financial statements.

FUND  FINANCIAL  HIGHLIGHTS 15

Notes to Financial Statements

1. ORGANIZATION

BlackRock Funds VI (the “Trust”) is registered under the Investment Company Act of 1940, as amended (the “1940 Act”), as an open-end management investment company. The Trust is organized as a Delaware statutory trust. BlackRock Advantage CoreAlpha Bond Fund (the “Fund”) is a series of the Trust. The Fund is classified as diversified.

The Fund seeks to achieve its investment objective by investing all of its assets in Advantage CoreAlpha Bond Master Portfolio (the “Master Portfolio”), a series of Master Investment Portfolio II (“MIP II”), an affiliate of the Fund, which has the same investment objective and strategies as the Fund. The value of the Fund’s investment in the Master Portfolio reflects the Fund’s proportionate interest in the net assets of the Master Portfolio. The performance of the Fund is directly affected by the performance of the Master Portfolio. At December 31, 2022, the percentage of the Master Portfolio owned by the Fund was 91.2%. The financial statements of the Master Portfolio, including the Schedule of Investments, are included elsewhere in this report and should be read in conjunction with the Fund’s financial statements.

The 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 C Shares are generally available through financial intermediaries. Each class has exclusive voting rights with respect to matters relating to its shareholder servicing and distribution expenditures (except that Investor C shareholders may vote on material changes to the Investor A Shares distribution and service plan).

The Board of Trustees of the Trust and Board of Trustees of MIP II are referred to throughout this report as the “Board” and the members are referred to as “Trustees.”

Share Class	Initial Sales Charge	CDSC			Conversion Privilege
Institutional and Class K	No		No		None
Investor A Shares	Yes		No	(a)	None
Investor C Shares	No		Yes	(b)	To Investor A Shares after approximately 8 years

^(a)  Investor A 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.

^(b)  A CDSC of 1.00% is assessed on certain redemptions of Investor C Shares made within one year after purchase.

The Fund, together with certain other registered investment companies advised by BlackRock Advisors, LLC (“BAL” or the “Administrator”) or its affiliates, is included in a complex of funds referred to as the BlackRock Fixed-Income 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 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 financial reporting purposes, contributions to and withdrawals from the Master Portfolio are accounted for on a trade date basis. The Fund records its proportionate share of the Master Portfolio’s 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, the Fund 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: The 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.

The 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 Statement 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.

Distributions: Distributions from net investment income are declared daily and paid monthly. Distributions of capital gains are recorded on the ex-dividend dates and made at least annually. The portion of distributions, if any, that exceeds a fund’s current and accumulated earnings and profits, as measured on a tax basis, constitute a non-taxable return of capital. The character and timing of distributions are determined in accordance with U.S. federal income tax regulations, which may differ from U.S. GAAP.

Deferred Compensation Plan: Under the Deferred Compensation Plan (the “Plan”) approved by the Fund’s Board, the trustees who are not “interested persons” of the Fund, as defined in the 1940 Act (“Independent Trustees”), may defer a portion of their annual complex-wide compensation. Deferred amounts earn an approximate return as though equivalent dollar amounts had been invested in common shares of certain funds in the BlackRock Fixed-Income Complex selected by the Independent Trustees. This has the same economic effect for the Independent Trustees as if the Independent Trustees had invested the deferred amounts directly in certain funds in the BlackRock Fixed-Income Complex.

The Plan is not funded and obligations thereunder represent general unsecured claims against the general assets of the Fund, as applicable. Deferred compensation liabilities, if any, are included in the Trustees’ and Officer’s fees payable in the Statement of Assets and Liabilities and will remain as a liability of the Fund until such amounts are distributed in accordance with the Plan. Net appreciation (depreciation) in the value of participants’ deferral accounts is allocated among the participating funds in the

16 2 0 2 2   BLACK ROCK  ANNUAL  REPORT  TO   SHAREHOLDERS

Notes to Financial Statements  (continued)

BlackRock Fixed-Income Complex and reflected as Trustees expense on the Statement of Operations. The Trustees and Officer expense may be negative as a result of a decrease in value of the deferred accounts.

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

Other: Expenses directly related to the Fund or its classes are charged to the Fund or the applicable class. Expenses directly related to the Fund and other shared expenses prorated to the Fund are allocated daily to each class based on its relative net assets or other appropriate methods. Other operating expenses shared by several funds, including other funds managed by the Administrator, 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 Fund’s policy is to value its financial instruments at fair value. The Fund records its investment in the Master Portfolio at fair value based on the Fund’s proportionate interest in the net assets of the Master Portfolio. Valuation of securities held by the Master Portfolio is discussed in Note 3 of the Master Portfolio’s Notes to Financial Statements, which are included elsewhere in this report.

4. ADMINISTRATION AGREEMENT AND OTHER TRANSACTIONS WITH AFFILIATES

Administration: The Trust, on behalf of the Fund, entered into an Administration Agreement with BAL, which has agreed to provide general administrative services (other than investment advice and related portfolio activities). BAL has agreed to bear all of the Fund’s ordinary operating expenses, excluding, generally, investment advisory fees, distribution fees, brokerage and other expenses related to the execution of portfolio transactions, extraordinary expenses and certain other expenses which are borne by the Fund. BAL is entitled to receive for these administrative services an annual fee based on the average daily net assets of the Fund as follows:

	Institutional			Investor A			Investor C			Class K
Administration fees - class specific		0.05	%		0.05	%		0.05	%		0.05	%

For the year ended December 31, 2022, the following table shows the class specific administration fees borne directly by each share class of the Fund:

	Institutional		Investor A		Investor C		Class K		Total
Administration fees — class specific	$	331,867	$	183,633	$	270	$	42,463	$	558,233

From time to time, BAL may waive such fees in whole or in part. Any such waiver will reduce the expenses of the Fund and, accordingly, have a favorable impact on its performance. BAL may delegate certain of its administration duties to sub-administrators.

Service and Distribution Fees: The Trust, on behalf of the Fund, entered into a Distribution Agreement and a Distribution and Service Plan with BlackRock Investments, LLC (“BRIL”), an affiliate of the Administrator. Pursuant to the Distribution and Service Plan and in accordance with Rule 12b-1 under the 1940 Act, the 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 the Fund as follows:

Share Class	Service Fees			Distribution Fees
Investor A		0.25	%		N/A
Investor C		0.25			0.75	%

BRIL and broker-dealers, pursuant to sub-agreements with BRIL, provide shareholder servicing and distribution services to the Fund. 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, 2022, the following table shows the class specific service and distribution fees borne directly by each share class of the Fund:

Fund Name	Investor A		Investor C		Total
BlackRock Advantage CoreAlpha Bond Fund	$	918,164	$	5,406	$	923,570

Other Fees: For the year ended December 31, 2022, affiliates earned underwriting discounts, direct commissions and dealer concessions on sales of the Fund’s Investor A Shares for a total of $9,814.

For the year ended December 31, 2022, affiliates received CDSCs as follows:

	Investor A		Investor C		Total
CDSC	$	1,144	$	133	$	1,277

Expense Waivers and Reimbursements: 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. BAL has contractually agreed to reimburse the Fund or provide an offsetting credit against the administration fees paid by the Fund in an amount equal to these independent expenses through June 30, 2023. For the year ended December 31, 2022, the amount waived was $11,069 which is included in fees waived and/or reimbursed by the Administrator in the Statement of Operations.

FUND  NOTES  TO  FINANCIAL  STATEMENTS 17

Notes to Financial Statements  (continued)

BAL has contractually agreed to waive 0.05% of the administration fee payable to BAL applicable to Class K Shares of the Fund through June 30, 2023. For the year ended December 31, 2022, the amount waived was $42,462 which is included in fees waived and/or reimbursed by the Administrator in the Statement of Operations.

Interfund Lending: In accordance with an exemptive order (the “Order”) from the U.S. Securities and Exchange Commission (“SEC”), the 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 the Fund’s investment policies and restrictions. The 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.

During the year ended December 31, 2022, the Fund did not participate in the Interfund Lending Program.

Trustees and Officers: Certain trustees and/or officers of the Trust are directors and/or officers of BlackRock, Inc. (“BlackRock”) or its affiliates.

5. INCOME TAX INFORMATION

It is the 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.

The 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 the Fund’s U.S. federal tax returns generally remains open for a period of three years after they are filed. The statutes of limitations on the 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 Fund as of December 31, 2022, 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 Fund’s financial statements.

The tax character of distributions paid was as follows:

Fund Name	Year Ended 12/31/22		Year Ended 12/31/21
BlackRock Advantage CoreAlpha Bond Fund
Ordinary income	$	14,401,609	$	21,625,103
Long-term capital gains		—		5,436,958
Return of capital		9,816,730		7,634,871
	$	24,218,339	$	34,696,932

As of December 31, 2022, the tax components of accumulated earnings (loss) were as follows:

Fund Name		Non-Expiring Capital Loss Carryforwards(a)		Net Unrealized Gains (Losses)(b)		Total
BlackRock Advantage CoreAlpha Bond Fund	$	(102,382,307)	$	(90,350,050)	$	(192,732,357	)

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

^(b)  The difference between book-basis and tax-basis net unrealized gains was attributable primarily to the timing and recognition of partnership income.

6. CAPITAL SHARE TRANSACTIONS

Transactions in capital shares for each class were as follows:

	Year Ended 12/31/22						Year Ended 12/31/21
Fund Name / Share Class	Shares			Amounts			Shares			Amounts
BlackRock Advantage CoreAlpha Bond Fund
Institutional
Shares sold		10,328,229		$	92,951,945			21,546,402		$	226,875,229
Shares issued in reinvestment of distributions		1,621,623			14,778,556			2,149,167			22,509,645
Shares redeemed		(28,635,672	)		(260,304,984	)		(44,625,546	)		(468,904,081	)
		(16,685,820	)	$	(152,574,483	)		(20,929,977	)	$	(219,519,207	)

18 2 0 2 2   BLACK ROCK  ANNUAL  REPORT  TO   SHAREHOLDERS

Notes to Financial Statements  (continued)

	Year Ended 12/31/22						Year Ended 12/31/21
Fund Name / Share Class (continued)	Shares			Amounts			Shares			Amounts
BlackRock Advantage CoreAlpha Bond Fund (continued)
Investor A
Shares sold and automatic conversion of shares		1,111,768		$	10,338,215			2,471,260		$	26,053,426
Shares issued in reinvestment of distributions		786,870			7,153,619			965,436			10,108,490
Shares redeemed		(7,808,329	)		(72,036,717	)		(7,450,516	)		(78,204,224	)
		(5,909,691	)	$	(54,544,883	)		(4,013,820	)	$	(42,042,308	)
Investor C
Shares sold		18,449		$	174,991			45,471		$	480,128
Shares issued in reinvestment of distributions		693			6,339			1,506			15,787
Shares redeemed and automatic conversion of shares		(55,228	)		(519,584	)		(104,199	)		(1,096,788	)
		(36,086	)	$	(338,254	)		(57,222	)	$	(600,873	)
Class K
Shares sold		5,437,591		$	53,122,988			4,535,921		$	47,858,479
Shares issued in reinvestment of distributions		212,809			1,940,745			166,600			1,744,823
Shares redeemed		(5,031,617	)		(45,766,985	)		(3,460,059	)		(36,256,660	)
		618,783		$	9,296,748			1,242,462		$	13,346,642
		(22,012,814	)	$	(198,160,872	)		(23,758,557	)	$	(248,815,746	)

As of December 31, 2022, BlackRock HoldCo 2, Inc., an affiliate of the Fund, owned 1,924 Investor C Shares of the Fund.

7. SUBSEQUENT EVENTS

Management has evaluated the impact of all subsequent events on the Fund 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.

FUND  NOTES  TO  FINANCIAL  STATEMENTS 19

Report of Independent Registered Public Accounting Firm

To the Board of Trustees of BlackRock Funds VI and Shareholders of BlackRock Advantage CoreAlpha Bond Fund

Opinion on the Financial Statements

We have audited the accompanying statement of assets and liabilities of BlackRock Advantage CoreAlpha Bond Fund (constituting BlackRock Funds VI, referred to hereafter as the “Fund”) as of December 31, 2022, the related statement of operations for the year ended December 31, 2022, the statements of changes in net assets for each of the two years in the period ended December 31, 2022, including the related notes, and the financial highlights for each of the five years in the period ended December 31, 2022 (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Fund as of December 31, 2022, 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 ended December 31, 2022 and the financial highlights for each of the five years in the period ended December 31, 2022 in conformity with accounting principles generally accepted in the United States of America.

Basis for Opinion

These financial statements are the responsibility of the Fund’s management. Our responsibility is to express an opinion on the Fund’s financial statements 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 of these financial statements 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 are free of material misstatement, whether due to error or fraud.

Our audits included performing procedures to assess the risks of material misstatement of the financial statements, 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. 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. Our procedures included confirmation of securities owned as of December 31, 2022 by correspondence with the accounting agent of the Master Portfolio. We believe that our audits provide a reasonable basis for our opinion.

/s/PricewaterhouseCoopers LLP

Philadelphia, Pennsylvania

February 23, 2023

We have served as the auditor of one or more BlackRock investment companies since 2000.

20 2 0 2 2   BLACK ROCK  ANNUAL  REPORT  TO   SHAREHOLDERS

Important Tax Information  (unaudited)

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, 2022:

Fund Name	Federal Obligation Interest
BlackRock Advantage CoreAlpha Bond Fund	$	451,483

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, 2022:

Fund Name	Interest Dividends
BlackRock Advantage CoreAlpha Bond Fund	$	14,638,721

The Fund hereby designates the following amount, or maximum amount 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, 2022:

Fund Name	Interest Related Dividends
BlackRock Advantage CoreAlpha Bond Fund	$	14,638,721

IMPORTANT  TAX  INFORMATION 21

Master Portfolio Information    as of December 31, 2022 Advantage CoreAlpha Bond Master Portfolio

PORTFOLIO COMPOSITION

Asset Type(a)	Percent of Total Investments
Corporate Bonds		40.7	%
U.S. Government Sponsored Agency Securities		36.8
Asset-Backed Securities		11.9
Non-Agency Mortgage-Backed Securities		9.4
Other*		1.2

CREDIT QUALITY ALLOCATION

Credit Rating(a)(b)	Percent of Total Investments
AAA/Aaa(c)		48.9	%
AA/Aa		4.4
A		23.5
BBB/Baa		17.8
BB/Ba		1.5
B		0.9
CCC/Caa		0.2
N/R		2.8

^(a)  Excludes short-term securities.

^(b) 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.

^(c) Includes U.S. Government Sponsored Agency Securities which are deemed AAA/Aaa by the investment adviser.

* Includes one or more investment categories that individually represents less than 1.0% of the Master Portfolio’s total investments. Please refer to the Schedule of Investments for details.

22 2 0 2 2   BLACK ROCK  ANNUAL  REPORT  TO   SHAREHOLDERS

Schedule of Investments December 31, 2022 Advantage CoreAlpha Bond Master Portfolio (Percentages shown are based on Net Assets)

Security	Par (000)		Value
Asset-Backed Securities
ACC Auto Trust, Series 2021-A, Class A, 1.08%, 04/15/27(a)	$	1,016	$	1,003,278
Avant Loans Funding Trust, Series 2021-REV1, Class A, 1.21%, 07/15/30(a)		5,460		5,200,326
Carvana Auto Receivables Trust
Series 2021-N2, Class B, 0.75%, 03/10/28		563		512,570
Series 2021-N2, Class C, 1.07%, 03/10/28		1,781		1,636,161
Chase Funding Trust, Series 2004-2, Class 2A2, (1 mo. LIBOR US + 0.50%), 4.89%, 02/26/35(b)		112		104,981
College Loan Corp. Trust I, Series 2004-1, Class A4, (3 mo. LIBOR US + 0.19%), 4.55%, 04/25/24(b)		420		418,435
Conseco Finance Corp., Series 1996-9, Class M1, 7.63%, 08/15/27(b)		11		11,362
CWABS, Inc., Series 2004-1, Class M1, (1 mo. LIBOR US + 0.75%), 5.14%, 03/25/34(b)		6		5,300
Drive Auto Receivables Trust
Series 2020-1, Class C, 2.36%, 03/16/26		820		818,956
Series 2020-1, Class D, 2.70%, 05/17/27		7,600		7,459,067
Series 2020-2, Class C, 2.28%, 08/17/26		1,142		1,135,357
Series 2021-1, Class C, 1.02%, 06/15/27		6,240		6,099,959
Exeter Automobile Receivables Trust
Series 2020-3A, Class D, 1.73%, 07/15/26		1,730		1,666,710
Series 2021-1A, Class C, 0.74%, 01/15/26		6,383		6,243,947
Series 2021-3A, Class B, 0.69%, 01/15/26		2,309		2,272,412
Series 2021-3A, Class C, 0.96%, 10/15/26		2,950		2,798,273
Ford Credit Auto Owner Trust(a)
Series 2018-1, Class A, 3.19%, 07/15/31		2,870		2,741,447
Series 2019-1, Class A, 3.52%, 07/15/30		450		441,200
JPMorgan Chase Bank NA(a)
Series 2021-2, Class B, 0.89%, 12/26/28		2,125		2,030,823
Series 2021-2, Class C, 0.97%, 12/26/28		914		871,036
Series 2021-3, Class B, 0.76%, 02/26/29		3,999		3,769,565
Louisiana Local Government Environmental Facilities & Community Development Authority, Series 2022-ELL, Class A-3, 4.28%, 02/01/36(c)		85		78,244
OneMain Financial Issuance Trust, Series 2019-2A, Class A, 3.14%, 10/14/36(a)		5,690		5,077,659
Santander Drive Auto Receivables Trust
Series 2020-2, Class D, 2.22%, 09/15/26		8,000		7,791,775
Series 2020-4, Class C, 1.01%, 01/15/26		3,606		3,569,654
Series 2021-1, Class C, 0.75%, 02/17/26		3,877		3,809,724
Series 2021-3, Class C, 0.95%, 09/15/27		4,420		4,251,351
Series 2021-4, Class C, 1.26%, 02/16/27		5,030		4,781,092
Santander Revolving Auto Loan Trust,
Series 2019-A, Class A, 2.51%, 01/26/32(a)		4,790		4,512,728
Toyota Auto Loan Extended Note Trust, Series 2020-1A, Class A, 1.35%, 05/25/33(a)		5,680		5,196,244
Upstart Securitization Trust(a)
Series 2021-1, Class A, 0.87%, 03/20/31		102		101,405
Series 2021-3, Class A, 0.83%, 07/20/31		1,477		1,446,204
Series 2021-4, Class A, 0.84%, 09/20/31		2,787		2,697,898
Series 2021-5, Class A, 1.31%, 11/20/31		1,034		989,272
Westlake Automobile Receivables Trust(a)
Series 2020-2A, Class C, 2.01%, 07/15/25		4,555		4,510,100
Series 2020-3A, Class B, 0.78%, 11/17/25		1,884		1,874,538

Security	Par (000)		Value
Asset-Backed Securities (continued)
Westlake Automobile Receivables Trust(a) (continued)
Series 2020-3A, Class C, 1.24%, 11/17/25	$	4,250	$	4,143,293
Series 2022-1A, Class B, 2.75%, 03/15/27		3,970		3,824,493
Total Asset-Backed Securities — 10.2% (Cost: $110,387,304)				105,896,839
	Shares
Common Stocks
Diversified Financial Services(d) — 0.0%
Edcon Holdco 1		1,643,590		1
Edcon Holdco 2		163,560		—
				1
Total Common Stocks — 0.0% (Cost: $ — )				1
	Par (000)
Corporate Bonds
Advertising Agencies — 0.0%
Interpublic Group of Cos., Inc., 3.38%, 03/01/41	$	378		265,228
Aerospace & Defense — 0.9%
3M Co., 2.65%, 04/15/25(c)		1,710		1,633,660
Boeing Co., 4.51%, 05/01/23		1,300		1,297,594
Bombardier, Inc., 7.88%, 04/15/27(a)(c)		540		523,787
Carlisle Cos., Inc., 2.75%, 03/01/30		1,729		1,438,686
General Dynamics Corp. 3.25%, 04/01/25		1,130		1,094,919
2.25%, 06/01/31		1,350		1,129,223
Lockheed Martin Corp. 4.15%, 06/15/53		700		593,696
5.70%, 11/15/54		930		974,417
4.30%, 06/15/62		535		449,409
5.90%, 11/15/63		135		144,934
Trane Technologies Luxembourg Finance SA, 4.50%, 03/21/49(c)		95		76,973
				9,357,298
Airlines(a) — 0.2%
American Airlines, Inc./AAdvantage Loyalty IP Ltd., 5.75%, 04/20/29(c)		1,135		1,037,340
United Airlines, Inc., 4.63%, 04/15/29		1,195		1,040,481
				2,077,821
Automobiles — 0.5%
American Honda Finance Corp., 1.20%, 07/08/25(c)		900		822,642
Ford Motor Credit Co. LLC, 4.54%, 08/01/26		555		511,380
General Motors Financial Co., Inc.
4.15%, 06/19/23		215		213,849
2.90%, 02/26/25		1,335		1,264,452
Genuine Parts Co., 1.88%, 11/01/30		1,530		1,178,011
Toyota Motor Credit Corp., 3.65%, 08/18/25		1,110		1,078,502
				5,068,836

MASTER  PORTFOLIO  SCHEDULE  OF  INVESTMENTS 23

Schedule of Investments  (continued) December 31, 2022 Advantage CoreAlpha Bond Master Portfolio (Percentages shown are based on Net Assets)

Security	Par (000)		Value
Banks — 2.1%
Bank of Montreal, 2.65%, 03/08/27(c)	$	935	$	853,937
Canadian Imperial Bank of Commerce, 2.25%, 01/28/25		1,505		1,420,319
First Republic Bank, (1 day SOFR + 0.62%), 1.91%, 02/12/24(b)		2,500		2,489,838
HSBC USA, Inc., 3.75%, 05/24/24		441		432,383
Huntington National Bank, 5.65%, 01/10/30		2,855		2,876,794
ING Groep NV, 4.10%, 10/02/23		2,290		2,271,436
Royal Bank of Canada, 3.63%, 05/04/27		1,030		978,910
Santander U.K. Group Holdings PLC, (3 mo. LIBOR US + 1.40%), 3.82%, 11/03/28(b)		240		214,469
Toronto-Dominion Bank, 1.45%, 01/10/25		1,420		1,322,280
Truist Financial Corp., 1.20%, 08/05/25		2,710		2,478,710
Wells Fargo & Co.(b)
(1 day SOFR + 1.51%), 3.53%, 03/24/28		35		32,410
(1 day SOFR + 1.56%), 4.54%, 08/15/26		3,395		3,326,962
(1 day SOFR + 1.98%), 4.81%, 07/25/28		940		918,095
(1 day SOFR + 2.10%), 4.90%, 07/25/33		2,255		2,141,197
(1 day SOFR + 4.50%), 5.01%, 04/04/51		610		537,334
Westpac Banking Corp., 2.96%, 11/16/40		120		79,232
				22,374,306
Beverages — 0.9%
Coca-Cola Co., 3.00%, 03/05/51(c)		90		65,441
Coca-Cola Femsa SAB de CV, 2.75%, 01/22/30(c)		1,784		1,537,362
Constellation Brands, Inc. 4.75%, 05/09/32(c)		640		615,818
3.75%, 05/01/50		250		187,091
Diageo Capital PLC 2.13%, 04/29/32		380		302,632
5.50%, 01/24/33(c)		1,335		1,396,756
Keurig Dr. Pepper, Inc. 3.95%, 04/15/29		1,661		1,545,035
4.05%, 04/15/32(c)		245		222,864
4.50%, 04/15/52		1,270		1,058,205
PepsiCo, Inc. 2.85%, 02/24/26		800		759,782
3.45%, 10/06/46		7		5,597
4.00%, 05/02/47		946		819,991
2.88%, 10/15/49		719		513,682
				9,030,256
Biotechnology — 0.5%
Amgen, Inc. 3.63%, 05/22/24		400		392,096
3.13%, 05/01/25		800		767,688
2.60%, 08/19/26(c)		800		739,173
4.88%, 03/01/53		180		159,637
4.40%, 02/22/62		410		324,380
Gilead Sciences, Inc., 3.50%, 02/01/25		400		387,300
Regeneron Pharmaceuticals, Inc., 1.75%, 09/15/30		2,640		2,039,051
				4,809,325
Building Materials — 0.1%
Boise Cascade Co., 4.88%, 07/01/30(a)(c)		750		652,783
Eagle Materials, Inc., 2.50%, 07/01/31		415		325,543
Masco Corp., 2.00%, 10/01/30		160		124,013
				1,102,339
Building Products — 0.2%
Allegion PLC, 3.50%, 10/01/29		90		77,549

Security	Par (000)		Value
Building Products (continued)
Home Depot, Inc. 4.00%, 09/15/25	$	245	$	242,103
5.40%, 09/15/40		200		205,037
3.13%, 12/15/49		360		254,897
4.95%, 09/15/52(c)		120		115,181
Lowe’s Cos., Inc. 4.00%, 04/15/25		420		411,820
3.35%, 04/01/27		280		262,854
4.25%, 04/01/52		116		91,965
5.63%, 04/15/53		67		64,139
5.80%, 09/15/62		305		291,934
				2,017,479
Capital Markets — 0.4%
Ameriprise Financial, Inc., 3.00%, 04/02/25		930		890,808
Ares Capital Corp. 2.15%, 07/15/26		702		594,364
2.88%, 06/15/28		240		192,439
Blackstone Private Credit Fund, 4.70%, 03/24/25(c)		220		210,890
Charles Schwab Corp., 2.45%, 03/03/27		345		314,513
FS KKR Capital Corp., 2.63%, 01/15/27		1,263		1,054,397
Nomura Holdings, Inc., 2.65%, 01/16/25		1,100		1,038,598
				4,296,009
Chemicals — 0.3%
Air Products and Chemicals, Inc., 2.70%, 05/15/40		187		139,135
CF Industries, Inc. 4.95%, 06/01/43		1,125		962,467
5.38%, 03/15/44		55		49,413
EI du Pont de Nemours and Co., 2.30%, 07/15/30		500		416,001
International Flavors & Fragrances, Inc., 3.20%, 05/01/23		1,590		1,580,068
RPM International, Inc., 3.75%, 03/15/27		105		97,751
				3,244,835
Commercial Services & Supplies(a) — 0.1%
ASGN, Inc., 4.63%, 05/15/28		575		520,490
Prime Security Services Borrower LLC/Prime Finance, Inc., 6.25%, 01/15/28		1,095		996,625
				1,517,115
Communications Equipment — 0.1%
Motorola Solutions, Inc. 4.60%, 02/23/28		259		250,855
5.50%, 09/01/44		1,370		1,233,524
				1,484,379
Consumer Discretionary — 0.7%
Carnival Corp., 7.63%, 03/01/26(a)		371		294,053
NCL Corp. Ltd.(a) 5.88%, 03/15/26		680		534,120
7.75%, 02/15/29		640		481,626
Quanta Services, Inc. 0.95%, 10/01/24		2,110		1,943,139
2.90%, 10/01/30		1,190		978,443
2.35%, 01/15/32		1,280		971,942
3.05%, 10/01/41		605		397,527
Royal Caribbean Cruises Ltd.(a)(c) 5.50%, 08/31/26		680		572,050
11.63%, 08/15/27		763		766,227
				6,939,127
Consumer Finance — 0.4%
American Express Co. 3.95%, 08/01/25		480		470,226

24 2 0 2 2   BLACK ROCK  ANNUAL  REPORT  TO   SHAREHOLDERS

Schedule of Investments  (continued) December 31, 2022 Advantage CoreAlpha Bond Master Portfolio (Percentages shown are based on Net Assets)

Security	Par (000)		Value
Consumer Finance (continued)
American Express Co. (continued) 4.05%, 05/03/29(c)	$	336	$	319,955
Block Financial LLC, 2.50%, 07/15/28		536		455,604
Mastercard, Inc., 3.65%, 06/01/49		280		226,660
S&P Global, Inc. 2.95%, 01/22/27(c)		685		640,808
2.45%, 03/01/27(a)(c)		840		767,164
2.30%, 08/15/60		2,113		1,150,158
Visa, Inc., 3.65%, 09/15/47		385		315,316
				4,345,891
Containers & Packaging — 0.0%
Packaging Corp. of America, 3.05%, 10/01/51		285		182,233
Diversified Financial Services — 6.5%
AerCap Ireland Capital DAC/AerCap Global
Aviation Trust
1.15%, 10/29/23		310		298,277
1.65%, 10/29/24		565		521,156
2.45%, 10/29/26		220		192,216
3.00%, 10/29/28		210		175,933
Air Lease Corp., 3.38%, 07/01/25		275		260,101
Banco Santander SA 2.75%, 05/28/25		1,600		1,497,425
(1 year CMT + 0.45%), 0.70%, 06/30/24(b)		2,200		2,139,213
(1 year CMT + 0.90%), 1.72%, 09/14/27(b)		400		341,667
Bank of America Corp.(b)
(1 day SOFR + 0.41%), 0.52%, 06/14/24		365		356,317
(1 day SOFR + 0.96%), 1.73%, 07/22/27		2,140		1,874,889
(1 day SOFR + 1.15%), 1.32%, 06/19/26		2,030		1,828,005
(1 day SOFR + 1.75%), 4.83%, 07/22/26		945		933,957
(1 day SOFR + 1.99%), 6.20%, 11/10/28		735		758,867
(1 day SOFR + 2.04%), 4.95%, 07/22/28		985		962,011
(3 mo. LIBOR US + 0.94%), 3.86%, 07/23/24		1,283		1,271,376
(3 mo. LIBOR US + 1.19%), 2.88%, 10/22/30		165		138,035
(3 mo. LIBOR US + 1.81%), 4.24%, 04/24/38		1,050		891,991
(3 mo. LIBOR US + 3.15%), 4.08%, 03/20/51		91		71,213
Series N, (1 day SOFR + 1.65%), 3.48%, 03/13/52		315		221,399
Bank of Nova Scotia 0.65%, 07/31/24		1,235		1,151,347
1.05%, 03/02/26		1,000		884,220
Barclays PLC(b)
(1 year CMT + 1.70%), 3.81%, 03/10/42		233		157,259
(1 year CMT + 2.30%), 5.30%, 08/09/26		965		957,786
Citigroup, Inc. 4.75%, 05/18/46(c)		50		41,548
(1 day SOFR + 0.69%), 0.78%, 10/30/24(b)		8,880		8,508,451
(1 day SOFR + 0.77%), 1.46%, 06/09/27(b)		3,035		2,632,583
(1 day SOFR + 1.67%), 1.68%, 05/15/24(b)		800		788,666
(3 mo. LIBOR US + 0.90%), 3.35%, 04/24/25(b)		2,805		2,719,947
CME Group, Inc., 2.65%, 03/15/32		305		255,479
Deutsche Bank AG
(1 day SOFR + 1.72%), 3.04%, 05/28/32(b)(c)		585		443,391
Series E, 0.96%, 11/08/23		445		428,147
Goldman Sachs Group, Inc. 3.75%, 05/22/25		500		483,578
3.50%, 11/16/26		365		342,145
3.85%, 01/26/27		1,090		1,037,816
2.60%, 02/07/30		2,380		1,986,155
(3 mo. LIBOR US + 1.30%), 4.22%, 05/01/29(b)		550		512,390
(3 mo. LIBOR US + 1.43%), 4.41%, 04/23/39(b)		720		622,101

Security	Par (000)		Value
Diversified Financial Services (continued)
HSBC Holdings PLC(b)
(1 day SOFR + 0.71%), 0.98%, 05/24/25	$	1,980	$	1,833,246
(1 day SOFR + 1.43%), 3.00%, 03/10/26		735		690,808
(1 day SOFR + 1.51%), 4.18%, 12/09/25		1,640		1,592,734
(1 day SOFR + 2.53%), 4.76%, 03/29/33		980		849,328
(1 day SOFR + 2.87%), 5.40%, 08/11/33		1,690		1,564,979
(1 day SOFR + 4.25%), 8.11%, 11/03/33		720		761,817
JPMorgan Chase & Co. 3.30%, 04/01/26(c)		266		252,150
(1 day SOFR + 0.61%), 1.56%, 12/10/25(b)		1,600		1,481,322
(1 day SOFR + 0.89%), 1.58%, 04/22/27(b)		816		716,989
(1 day SOFR + 1.85%), 2.08%, 04/22/26(b)		1,063		986,779
(1 day SOFR + 1.99%), 4.85%, 07/25/28(b)		1,150		1,121,001
(1 day SOFR + 2.08%), 4.91%, 07/25/33(b)		375		357,047
(3 mo. LIBOR US + 1.16%), 3.22%, 03/01/25(b)		600		583,162
(3 mo. SOFR + 1.59%), 2.01%, 03/13/26(b)		2,120		1,962,178
Kimberly-Clark Corp., 2.88%, 02/07/50(c)		160		109,663
Lloyds Banking Group PLC(b)
(1 year CMT + 0.55%), 0.70%, 05/11/24(c)		1,590		1,559,343
(1 year CMT + 2.30%), 4.98%, 08/11/33		430		394,822
Mitsubishi UFJ Financial Group, Inc.(b)
(1 year CMT + 0.55%), 0.95%, 07/19/25		1,820		1,691,083
(1 year CMT + 0.95%), 2.31%, 07/20/32		425		327,082
(1 year CMT + 0.97%), 2.49%, 10/13/32		315		245,434
Mizuho Financial Group, Inc., (1 day SOFR + 1.25%), 1.24%, 07/10/24(b)		2,845		2,776,135
Morgan Stanley 3.88%, 01/27/26		200		193,604
6.38%, 07/24/42		460		498,930
4.30%, 01/27/45		580		494,354
(1 day SOFR + 0.86%), 1.51%, 07/20/27(b)		1,510		1,310,360
(3 mo. LIBOR US + 1.63%), 4.43%, 01/23/30(b)		415		386,242
Series I, (1 day SOFR + 0.75%), 0.86%, 10/21/25(b)(c)		2,060		1,889,997
Nasdaq, Inc. 3.85%, 06/30/26		32		30,894
3.25%, 04/28/50		68		45,734
NatWest Group PLC, (1 year CMT + 2.15%), 2.36%, 05/22/24(b)		290		285,847
Sumitomo Mitsui Financial Group, Inc. 2.35%, 01/15/25		1,325		1,253,717
1.47%, 07/08/25		1,049		955,815
				67,889,653
Diversified Telecommunication Services — 0.7%
AT&T, Inc. 1.70%, 03/25/26		3,620		3,262,333
4.85%, 03/01/39		695		621,739
3.80%, 12/01/57		1,323		912,782
Sprint Capital Corp., 6.88%, 11/15/28		299		310,344
Verizon Communications, Inc. 1.68%, 10/30/30		1,687		1,314,967
4.50%, 08/10/33		610		570,769
4.13%, 08/15/46		430		341,626
				7,334,560
Education — 0.1%
Ford Foundation
Series 2020, 2.42%, 06/01/50(c)		5		3,145
Series 2020, 2.82%, 06/01/70		30		17,498
Georgetown University, Series 20A, 2.94%, 04/01/50		27		17,069

MASTER  PORTFOLIO  SCHEDULE  OF  INVESTMENTS 25

Schedule of Investments  (continued) December 31, 2022 Advantage CoreAlpha Bond Master Portfolio (Percentages shown are based on Net Assets)

Security	Par (000)		Value
Education (continued)
Massachusetts Institute of Technology, 3.07%, 04/01/52	$	264	$	193,297
Northwestern University, Series 2020, 2.64%, 12/01/50		266		172,672
President and Fellows of Harvard College, 2.52%, 10/15/50		54		35,056
Rockefeller Foundation, Series 2020, 2.49%, 10/01/50		72		45,617
University of Chicago
Series 20B, 2.76%, 04/01/45		148		110,640
Series C, 2.55%, 04/01/50		157		104,590
University of Southern California, Series 21A, 2.95%, 10/01/51(c)		190		127,358
Yale University, Series 2020, 2.40%, 04/15/50		272		172,664
				999,606
Electric Utilities — 3.1%
AEP Texas, Inc. 5.25%, 05/15/52		140		133,878
Series I, 2.10%, 07/01/30		260		210,782
AEP Transmission Co. LLC 3.15%, 09/15/49		30		20,756
Series O, 4.50%, 06/15/52		130		114,340
Alabama Power Co. 3.05%, 03/15/32		300		258,480
3.45%, 10/01/49		370		266,537
Ameren Corp., 2.50%, 09/15/24		65		62,170
Ameren Illinois Co., 3.25%, 03/15/50		130		93,043
American Electric Power Co., Inc., 2.03%, 03/15/24		1,115		1,075,066
Appalachian Power Co., Series X, 3.30%, 06/01/27		1,190		1,113,769
Arizona Public Service Co.(c) 3.15%, 05/15/25		400		382,575
2.95%, 09/15/27		800		727,288
Atlantic City Electric Co., 2.30%, 03/15/31		570		463,972
Baltimore Gas and Electric Co., 2.90%, 06/15/50		170		112,340
Berkshire Hathaway Energy Co., 4.45%, 01/15/49		500		429,364
Black Hills Corp., 1.04%, 08/23/24		200		186,519
CenterPoint Energy Houston Electric LLC
Sereis AJ, 4.85%, 10/01/52		75		71,564
Series AH, Class AH, 3.60%, 03/01/52		55		42,228
CenterPoint Energy, Inc., 4.25%, 11/01/28		170		159,365
Commonwealth Edison Co. 3.70%, 08/15/28		1,200		1,129,124
2.20%, 03/01/30		500		419,020
4.00%, 03/01/49		90		72,794
Series 130, 3.13%, 03/15/51		70		48,300
Consolidated Edison Co. of New York, Inc.
Series 06-A, 5.85%, 03/15/36		640		646,869
Series A, 4.13%, 05/15/49		50		40,634
Series B, 3.13%, 11/15/27		800		733,529
Consumers Energy Co. 2.65%, 08/15/52		125		78,597
4.20%, 09/01/52		60		51,333
Dominion Energy, Inc., 3.90%, 10/01/25		500		486,932
DTE Electric Co., Series B, 3.65%, 03/01/52		217		167,671
DTE Energy Co., 4.22%, 11/01/24(e)		250		245,737
Duke Energy Corp. 2.65%, 09/01/26		300		277,084
4.20%, 06/15/49		700		552,422

Security	Par (000)		Value
Electric Utilities (continued)
Duke Energy Corp. (continued) 5.00%, 08/15/52(c)	$	60	$	53,242
Duke Energy Florida LLC, 3.80%, 07/15/28		1,365		1,295,814
Duke Energy Ohio, Inc., 4.30%, 02/01/49		100		81,518
Entergy Corp., 0.90%, 09/15/25		285		253,796
Entergy Texas, Inc., 3.55%, 09/30/49		520		373,088
Evergy Kansas Central, Inc. 2.55%, 07/01/26		800		736,862
3.45%, 04/15/50		130		94,082
Evergy Metro, Inc., 3.65%, 08/15/25		300		291,393
Evergy, Inc., 2.90%, 09/15/29		50		43,177
Eversource Energy, Series M, 3.30%, 01/15/28		1,000		920,820
Florida Power & Light Co. 4.05%, 10/01/44		500		423,172
3.15%, 10/01/49		40		28,811
2.88%, 12/04/51		90		60,358
Georgia Power Co., 3.25%, 04/01/26		800		756,344
Interstate Power and Light Co., 2.30%, 06/01/30		530		433,059
Kentucky Utilities Co., 3.30%, 06/01/50		60		42,143
MidAmerican Energy Co. 3.10%, 05/01/27		800		748,975
3.15%, 04/15/50		60		42,464
2.70%, 08/01/52		105		67,227
National Rural Utilities Cooperative Finance Corp., 3.70%, 03/15/29		680		625,405
NextEra Energy Capital Holdings, Inc. 2.94%, 03/21/24		470		457,577
3.55%, 05/01/27		245		230,820
2.25%, 06/01/30		200		164,470
5.00%, 07/15/32(c)		50		49,037
NSTAR Electric Co. 3.10%, 06/01/51		110		75,529
4.95%, 09/15/52		90		86,943
Oglethorpe Power Corp., 5.05%, 10/01/48		130		111,151
Oncor Electric Delivery Co. LLC 3.80%, 06/01/49		320		257,215
4.60%, 06/01/52(a)(c)		40		36,564
4.95%, 09/15/52(a)		70		67,559
Pacific Gas and Electric Co. 2.10%, 08/01/27		65		55,512
3.00%, 06/15/28(c)		100		86,450
3.30%, 08/01/40		90		60,936
4.95%, 07/01/50		270		209,207
3.50%, 08/01/50		340		211,179
PacifiCorp., 4.13%, 01/15/49		280		229,122
PECO Energy Co. 3.05%, 03/15/51		70		47,818
4.38%, 08/15/52		105		92,358
PG&E Corp., 5.25%, 07/01/30(c)		1,131		1,029,210
Public Service Co. of Colorado 3.70%, 06/15/28		1,300		1,237,034
4.05%, 09/15/49		20		16,415
Public Service Electric and Gas Co. 2.25%, 09/15/26		400		363,263
3.00%, 05/15/27(c)		500		466,928
3.70%, 05/01/28(c)		800		757,927
3.10%, 03/15/32(c)		85		74,301
2.05%, 08/01/50(c)		105		58,508
San Diego Gas & Electric Co., 2.50%, 05/15/26		400		370,533
Sempra Energy, 3.70%, 04/01/29		140		127,607

26 2 0 2 2   BLACK ROCK  ANNUAL  REPORT  TO   SHAREHOLDERS

Schedule of Investments  (continued) December 31, 2022 Advantage CoreAlpha Bond Master Portfolio (Percentages shown are based on Net Assets)

Security	Par (000)		Value
Electric Utilities (continued)
Southern California Edison Co. 3.65%, 02/01/50	$	100	$	73,032
Series B, 4.88%, 03/01/49		260		228,624
Series C, 4.13%, 03/01/48		370		295,250
Southern Co., 3.25%, 07/01/26		1,900		1,786,571
Tampa Electric Co., 3.45%, 03/15/51		35		24,434
Tucson Electric Power Co., 1.50%, 08/01/30		190		145,340
Union Electric Co., 4.00%, 04/01/48		230		185,143
Virginia Electric and Power Co. 3.30%, 12/01/49		320		228,533
Series A, 3.80%, 04/01/28(c)		1,750		1,648,653
Series C, 4.63%, 05/15/52		110		95,994
Wisconsin Electric Power Co. 3.10%, 06/01/25(c)		800		763,854
4.75%, 09/30/32		20		19,597
Wisconsin Power and Light Co., 3.05%, 10/15/27		390		359,747
Wisconsin Public Service Corp., 3.30%, 09/01/49		85		59,257
Xcel Energy, Inc. 4.00%, 06/15/28(c)		900		861,406
3.50%, 12/01/49		50		36,466
				32,088,906
Electrical Equipment — 0.0%
Eaton Corp., 4.70%, 08/23/52(c)		90		81,428
Electronic Equipment, Instruments & Components — 0.2%
Amphenol Corp., 2.05%, 03/01/25		125		117,500
Arrow Electronics, Inc., 2.95%, 02/15/32		99		78,054
Keysight Technologies, Inc., 4.60%, 04/06/27		1,225		1,188,600
Xerox Holdings Corp., 5.50%, 08/15/28(a)		380		304,096
				1,688,250
Energy Equipment & Services — 0.1%
Baker Hughes Holdings LLC/Baker Hughes Co.-Obligor, Inc., 4.08%, 12/15/47		750		584,976
NOV, Inc., 3.95%, 12/01/42		60		41,832
				626,808
Environmental, Maintenance & Security Service — 0.1%
Waste Connections, Inc. 2.60%, 02/01/30		305		260,054
3.20%, 06/01/32		715		613,356
				873,410
Equity Real Estate Investment Trusts (REITs) — 0.7%
American Tower Corp. 3.38%, 10/15/26		110		102,846
3.65%, 03/15/27		950		887,281
3.70%, 10/15/49		190		134,764
Camden Property Trust, 2.80%, 05/15/30		240		206,503
Crown Castle, Inc. 3.70%, 06/15/26		1,000		950,835
2.90%, 04/01/41		1,040		712,463
Equinix, Inc., 2.63%, 11/18/24		225		214,266
Federal Realty Investment Trust, 3.50%, 06/01/30		210		179,680
Mid-America Apartments LP, 1.10%, 09/15/26		70		60,536
Public Storage 3.09%, 09/15/27		1,250		1,162,617
1.95%, 11/09/28(c)		1,775		1,514,107
2.25%, 11/09/31		525		421,020

Security	Par (000)		Value
Equity Real Estate Investment Trusts (REITs) (continued)
Simon Property Group LP, 3.50%, 09/01/25	$	90	$	86,196
Weyerhaeuser Co., 4.00%, 04/15/30		250		227,630
				6,860,744
Food & Staples Retailing — 0.5%
Conagra Brands, Inc. 5.30%, 11/01/38		440		414,332
5.40%, 11/01/48		340		314,169
Costco Wholesale Corp., 1.75%, 04/20/32		160		126,490
Dollar General Corp., 4.25%, 09/20/24		75		73,969
FirstCash, Inc., 5.63%, 01/01/30(a)		1,140		1,014,674
General Mills, Inc. 5.24%, 11/18/25		1,080		1,082,689
2.88%, 04/15/30		840		725,698
Kraft Heinz Foods Co. 3.88%, 05/15/27		575		549,353
4.88%, 10/01/49(c)		535		464,403
				4,765,777
Food Products — 0.0%
Hershey Co., 2.65%, 06/01/50		105		68,132
Tyson Foods, Inc., 5.10%, 09/28/48		80		73,805
				141,937
Health Care Equipment & Supplies — 0.2%
Abbott Laboratories, 4.90%, 11/30/46		1,310		1,277,165
Becton Dickinson and Co., 4.30%, 08/22/32(c)		180		168,484
DH Europe Finance II Sarl, 3.40%, 11/15/49		375		283,180
				1,728,829
Health Care Providers & Services — 0.9%
Allina Health System, Series 2021, 2.90%, 11/15/51		230		146,322
AmerisourceBergen Corp. 3.45%, 12/15/27		1,427		1,333,260
2.70%, 03/15/31		117		97,115
Banner Health, Series 2020, 3.18%, 01/01/50		119		83,170
Baylor Scott & White Holdings, Series 2021, 2.84%, 11/15/50		92		59,960
Beth Israel Lahey Health, Inc., Series L, 3.08%, 07/01/51		169		104,171
CommonSpirit Health, 3.91%, 10/01/50		339		250,889
Elevance Health, Inc., 3.35%, 12/01/24		1,395		1,352,139
Fred Hutchinson Cancer Center, Series 2022, 4.97%, 01/01/52(c)		130		120,235
Hackensack Meridian Health, Inc., Series 2020, 2.88%, 09/01/50		58		37,491
Hoag Memorial Hospital Presbyterian, 3.80%, 07/15/52		73		56,828
Humana, Inc. 3.85%, 10/01/24(c)		1,000		979,854
5.75%, 03/01/28		215		219,522
Inova Health System Foundation, 4.07%, 05/15/52		18		14,903
Kaiser Foundation Hospitals
Series 2021, 2.81%, 06/01/41		57		41,300
Series 2021, 3.00%, 06/01/51		161		109,649
McKesson Corp., 0.90%, 12/03/25		1,465		1,300,847
Memorial Sloan-Kettering Cancer Center,
Series 2020, 2.96%, 01/01/50		46		30,474
Methodist Hospital, Series 20A, 2.71%, 12/01/50		87		55,484
Providence St Joseph Health Obligated Group,
Series 21A, 2.70%, 10/01/51		136		80,420

MASTER  PORTFOLIO  SCHEDULE  OF  INVESTMENTS 27

Schedule of Investments  (continued) December 31, 2022 Advantage CoreAlpha Bond Master Portfolio (Percentages shown are based on Net Assets)

Security	Par (000)		Value
Health Care Providers & Services (continued)
Sutter Health, Series 20A, 3.36%, 08/15/50	$	54	$	36,599
UMass Memorial Health Care Obligated Group, 5.36%, 07/01/52		42		38,661
UnitedHealth Group, Inc. 2.30%, 05/15/31		185		154,171
4.75%, 07/15/45		800		749,144
2.90%, 05/15/50		410		277,375
3.25%, 05/15/51		5		3,578
5.88%, 02/15/53		570		615,466
3.13%, 05/15/60		730		494,819
6.05%, 02/15/63		325		352,670
WakeMed, Series A, 3.29%, 10/01/52		81		53,381
				9,249,897
Hotels, Restaurants & Leisure — 0.4%
Burger King (Restaurant Brands Int)/New Red Finance, Inc., 4.38%, 01/15/28(a)		1,250		1,119,258
Choice Hotels International, Inc., 3.70%, 12/01/29(c)		1,695		1,476,082
GLP Capital LP/GLP Financing II, Inc., 5.38%, 04/15/26		380		372,806
Marriott International, Inc., 5.00%, 10/15/27		170		167,744
McDonald’s Corp. 3.70%, 01/30/26		380		369,452
5.15%, 09/09/52		350		335,583
				3,840,925
Household Durables — 0.2%
NVR, Inc., 3.00%, 05/15/30		2,645		2,220,459
Independent Power and Renewable Electricity Producers — 0.0%
NRG Energy, Inc., 3.63%, 02/15/31(a)(c)		635		482,725
Insurance — 1.1%
Aflac, Inc., 4.75%, 01/15/49		575		510,042
Aon Global Ltd., 3.88%, 12/15/25		3,400		3,314,776
Arthur J Gallagher & Co., 3.50%, 05/20/51		580		404,675
Athene Holding Ltd. 3.95%, 05/25/51		30		20,243
3.45%, 05/15/52		55		33,715
Berkshire Hathaway Finance Corp. 4.20%, 08/15/48(c)		125		109,978
2.85%, 10/15/50(c)		95		63,449
3.85%, 03/15/52		325		259,041
Berkshire Hathaway, Inc., 3.13%, 03/15/26		355		340,183
Brown & Brown, Inc. 4.20%, 03/17/32(c)		240		208,071
4.95%, 03/17/52		782		634,768
Enstar Group Ltd., 3.10%, 09/01/31		805		587,839
Fairfax Financial Holdings Ltd., 3.38%, 03/03/31		360		294,960
Marsh & McLennan Cos., Inc. 4.75%, 03/15/39		111		101,996
4.20%, 03/01/48(c)		1,715		1,412,443
4.90%, 03/15/49		1,735		1,594,702
MetLife, Inc., 5.00%, 07/15/52		270		257,026
Progressive Corp. 4.13%, 04/15/47		295		246,954

Security	Par (000)		Value
Insurance (continued)
Progressive Corp. (continued) 3.70%, 03/15/52	$	35	$	26,835
Willis North America, Inc., 2.95%, 09/15/29		940		790,169
				11,211,865
Interactive Media & Services — 0.1%
Alphabet, Inc. 2.00%, 08/15/26		800		735,507
2.25%, 08/15/60		335		188,718
				924,225
Internet & Direct Marketing Retail — 0.1%
Genuine Parts Co., 1.75%, 02/01/25		1,050		980,360
Meta Platforms, Inc. 3.85%, 08/15/32		205		180,387
4.45%, 08/15/52		280		222,502
				1,383,249
Internet Software & Services — 0.1%
Booking Holdings, Inc., 4.63%, 04/13/30(c)		315		304,220
VeriSign, Inc., 2.70%, 06/15/31		630		513,083
				817,303
IT Services — 0.9%
Gartner, Inc., 4.50%, 07/01/28(a)		1,090		1,016,240
International Business Machines Corp. 4.00%, 07/27/25(c)		2,350		2,311,863
4.40%, 07/27/32(c)		2,905		2,771,552
4.25%, 05/15/49		565		465,811
Kyndryl Holdings, Inc., 4.10%, 10/15/41		30		17,964
Verisk Analytics, Inc. 4.00%, 06/15/25		1,400		1,360,762
4.13%, 03/15/29		1,056		988,555
				8,932,747
Life Sciences Tools & Services — 0.1%
Agilent Technologies, Inc., 2.30%, 03/12/31		1,115		899,075
Machinery — 0.3%
Deere & Co., 2.75%, 04/15/25		215		206,511
IDEX Corp., 2.63%, 06/15/31		3,039		2,515,684
John Deere Capital Corp., 3.40%, 06/06/25		595		577,220
Otis Worldwide Corp. 3.11%, 02/15/40		70		51,051
3.36%, 02/15/50		70		48,960
				3,399,426
Media — 0.9%
CCO Holdings LLC/CCO Holdings Capital Corp., 6.38%, 09/01/29(a)		545		512,158
Comcast Corp. 3.38%, 02/15/25		1,590		1,541,358
2.35%, 01/15/27		400		363,439
DISH DBS Corp. 7.75%, 07/01/26		425		342,716
7.38%, 07/01/28		411		290,783
FactSet Research Systems, Inc. 2.90%, 03/01/27		1,575		1,429,728
3.45%, 03/01/32		775		649,762
Fox Corp., 4.03%, 01/25/24		340		336,057

28 2 0 2 2   BLACK ROCK  ANNUAL  REPORT  TO   SHAREHOLDERS

Schedule of Investments  (continued) December 31, 2022 Advantage CoreAlpha Bond Master Portfolio (Percentages shown are based on Net Assets)

Security	Par (000)		Value
Media (continued)
Frontier Communications Holdings LLC(a) 6.75%, 05/01/29(c)	$	970	$	802,442
8.75%, 05/15/30		490		498,207
Thomson Reuters Corp., 3.35%, 05/15/26		800		756,804
Time Warner Cable LLC, 4.50%, 09/15/42		500		366,052
Univision Communications, Inc., 7.38%, 06/30/30(a)		1,145		1,094,277
				8,983,783
Metals & Mining — 0.2%
Nucor Corp., 3.13%, 04/01/32		195		165,288
Reliance Steel & Aluminum Co., 2.15%, 08/15/30(c)		1,575		1,240,256
Rio Tinto Finance USA Ltd., 2.75%, 11/02/51		230		152,141
Southern Copper Corp., 3.88%, 04/23/25		152		146,613
Vale Overseas Ltd. 3.75%, 07/08/30		100		87,363
6.88%, 11/21/36		160		168,780
				1,960,441
Multi-Utilities — 0.3%
Atmos Energy Corp.(c) 3.00%, 06/15/27		400		373,300
1.50%, 01/15/31		30		23,365
5.75%, 10/15/52		105		109,602
Dominion Energy, Inc., 5.38%, 11/15/32		140		138,766
National Fuel Gas Co., 2.95%, 03/01/31		335		262,523
NiSource, Inc. 3.60%, 05/01/30		60		53,425
3.95%, 03/30/48		310		240,459
5.00%, 06/15/52		20		18,187
ONE Gas, Inc., 4.25%, 09/01/32(c)		290		274,600
PacifiCorp., 5.35%, 12/01/53		135		133,609
Piedmont Natural Gas Co., Inc., 3.50%, 06/01/29		500		458,196
Southern California Gas Co., Series TT, 2.60%, 06/15/26		800		741,463
Southwest Gas Corp. 3.70%, 04/01/28(c)		230		209,461
2.20%, 06/15/30		85		66,481
Washington Gas Light Co., 3.65%, 09/15/49		30		21,758
				3,125,195
Oil, Gas & Consumable Fuels — 3.5%
Canadian Natural Resources Ltd., 2.95%, 07/15/30(c)		551		464,274
Cheniere Corpus Christi Holdings LLC(c) 5.13%, 06/30/27		2,900		2,864,992
3.70%, 11/15/29		846		764,717
Chevron Corp. 1.55%, 05/11/25		550		511,642
3.08%, 05/11/50		60		43,060
CNOOC Finance 2015 USA LLC, Series 2015, 3.50%, 05/05/25		600		576,488
CNX Resources Corp., 7.25%, 03/14/27(a)		116		115,130
ConocoPhillips Co. 3.76%, 03/15/42		1,165		966,150
3.80%, 03/15/52(c)		705		554,231
Continental Resources, Inc., 4.38%, 01/15/28		100		91,626
CQP Holdco LP/BIP-V Chinook Holdco LLC, 5.50%, 06/15/31(a)(c)		1,270		1,109,358
Crestwood Midstream Partners LP/Crestwood Midstream Finance Corp., 6.00%, 02/01/29(a)(c)		549		503,713

Security	Par (000)		Value
Oil, Gas & Consumable Fuels (continued)
DCP Midstream Operating LP, 3.25%, 02/15/32(c)	$	222	$	183,623
Devon Energy Corp. 4.50%, 01/15/30		412		383,569
7.88%, 09/30/31(c)		290		327,246
7.95%, 04/15/32(c)		393		446,022
5.60%, 07/15/41		925		862,961
5.00%, 06/15/45		655		565,539
Diamondback Energy, Inc., 6.25%, 03/15/33		125		126,871
Enbridge, Inc. 2.50%, 08/01/33		150		115,370
3.40%, 08/01/51(c)		195		132,353
Enerflex Ltd., 9.00%, 10/15/27		25		24,931
Energy Transfer LP 5.75%, 02/15/33		635		621,259
5.00%, 05/15/50		855		683,086
EQT Corp., 7.00%, 02/01/30(c)		470		487,446
Equinor ASA 3.25%, 11/10/24(c)		400		389,849
3.25%, 11/18/49		500		363,194
Exxon Mobil Corp. 2.99%, 03/19/25		2,170		2,090,156
3.45%, 04/15/51(c)		625		470,520
Global Partners LP/GLP Finance Corp., 6.88%, 01/15/29		555		508,419
Hess Corp., 5.60%, 02/15/41(c)		165		155,969
Kinder Morgan, Inc. 4.80%, 02/01/33		717		664,742
5.55%, 06/01/45		375		341,929
Marathon Oil Corp., 6.60%, 10/01/37		90		89,441
Marathon Petroleum Corp. 4.50%, 04/01/48		93		74,269
5.00%, 09/15/54		182		151,875
MPLX LP 4.88%, 12/01/24		209		207,291
4.50%, 04/15/38		125		105,296
5.20%, 03/01/47		70		59,412
4.70%, 04/15/48		805		635,251
5.50%, 02/15/49		685		602,041
4.95%, 03/14/52		3,125		2,552,637
4.90%, 04/15/58		340		266,295
New Fortress Energy, Inc., 6.50%, 09/30/26(a)(c)		1,590		1,476,633
ONEOK Partners LP 4.90%, 03/15/25		2,000		1,971,021
6.13%, 02/01/41		75		70,733
ONEOK, Inc. 2.75%, 09/01/24		1,475		1,412,068
6.35%, 01/15/31		1,140		1,158,177
6.10%, 11/15/32		590		589,971
7.15%, 01/15/51		80		81,222
Pioneer Natural Resources Co., 2.15%, 01/15/31		150		118,560
Plains All American Pipeline LP/PAA Finance Corp., 4.90%, 02/15/45		170		131,693
Shell International Finance BV 6.38%, 12/15/38		67		73,664
3.00%, 11/26/51		178		120,527
Targa Resources Corp., 4.95%, 04/15/52		190		150,310
Targa Resources Partners LP/Targa Resources Partners Finance Corp. 5.50%, 03/01/30		1,100		1,035,012
4.88%, 02/01/31		910		821,685
4.00%, 01/15/32		1,940		1,632,297

MASTER  PORTFOLIO  SCHEDULE  OF  INVESTMENTS 29

Schedule of Investments  (continued) December 31, 2022 Advantage CoreAlpha Bond Master Portfolio (Percentages shown are based on Net Assets)

Security	Par (000)		Value
Oil, Gas & Consumable Fuels (continued)
TransCanada PipeLines Ltd., 3.75%, 10/16/23(c)	$	800	$	791,788
Transcontinental Gas Pipe Line Co. LLC, 3.95%, 05/15/50		95		72,237
Williams Cos., Inc. 8.75%, 03/15/32		790		930,280
3.50%, 10/15/51		545		370,901
				36,263,022
Personal Products — 0.1%
Colgate-Palmolive Co., 3.25%, 08/15/32		90		81,220
Coty, Inc./HFC Prestige Products, Inc./HFC Prestige International U.S. LLC, 4.75%, 01/15/29(a)		347		314,035
Procter & Gamble Co., 1.20%, 10/29/30		645		506,075
Unilever Capital Corp., 2.00%, 07/28/26		800		729,048
				1,630,378
Pharmaceuticals — 1.5%
AbbVie, Inc. 2.60%, 11/21/24		3,520		3,367,441
4.05%, 11/21/39		50		42,797
4.40%, 11/06/42		135		117,102
4.70%, 05/14/45		145		128,789
4.25%, 11/21/49(c)		410		340,253
AstraZeneca PLC, 3.13%, 06/12/27(c)		990		929,592
Bristol-Myers Squibb Co. 2.55%, 11/13/50(c)		1,070		670,220
3.90%, 03/15/62		55		42,279
Cigna Corp. 3.75%, 07/15/23		444		441,070
3.40%, 03/15/51		665		472,653
CVS Health Corp. 3.00%, 08/15/26		75		70,054
4.78%, 03/25/38		265		241,397
5.13%, 07/20/45		185		168,610
5.05%, 03/25/48		315		282,727
4.25%, 04/01/50		315		250,713
Eli Lilly & Co., 2.75%, 06/01/25		378		361,310
Johnson & Johnson 3.63%, 03/03/37		195		173,240
3.70%, 03/01/46		529		443,785
Merck & Co., Inc. 0.75%, 02/24/26(c)		5,085		4,502,269
4.00%, 03/07/49		330		281,088
Novartis Capital Corp., 2.75%, 08/14/50		271		187,436
Pfizer, Inc., 7.20%, 03/15/39		80		96,732
Viatris, Inc. 1.65%, 06/22/25		180		163,025
4.00%, 06/22/50		150		92,421
Zoetis, Inc. 3.00%, 09/12/27(c)		1,800		1,664,077
3.90%, 08/20/28		5		4,749
3.00%, 05/15/50		100		67,550
				15,603,379
Real Estate Management & Development — 0.1%
CBRE Services, Inc., 4.88%, 03/01/26		670		661,458
Road & Rail — 0.3%
Burlington Northern Santa Fe LLC 3.00%, 04/01/25		800		769,381
3.05%, 02/15/51		990		687,876
Canadian National Railway Co., 4.40%, 08/05/52		240		213,142

Security	Par (000)		Value
Road & Rail (continued)
CSX Corp., 2.60%, 11/01/26	$	800	$	736,445
Union Pacific Corp. 3.25%, 08/15/25		400		384,426
3.25%, 02/05/50		90		64,851
2.97%, 09/16/62		95		61,022
3.75%, 02/05/70		40		29,158
				2,946,301
Semiconductors & Semiconductor Equipment — 0.9%
Analog Devices, Inc. 2.95%, 04/01/25(c)		225		216,404
1.70%, 10/01/28		385		326,218
2.80%, 10/01/41		240		175,651
2.95%, 10/01/51		180		121,294
Barings BDC, Inc., 3.30%, 11/23/26		285		241,560
Broadcom, Inc. 3.15%, 11/15/25		198		187,552
4.00%, 04/15/29(a)		1,860		1,689,703
3.14%, 11/15/35(a)		475		349,251
3.50%, 02/15/41(a)		1,110		788,138
3.75%, 02/15/51(a)		1,365		942,367
Flex Ltd. 3.75%, 02/01/26		5		4,704
4.88%, 06/15/29		745		701,464
Goldman Sachs Group, Inc., 5.70%, 11/01/24(c)		650		657,736
Intel Corp., 3.40%, 03/25/25		865		843,262
Jabil, Inc., 1.70%, 04/15/26		1,055		934,884
Micron Technology, Inc., 6.75%, 11/01/29		180		182,840
NXP BV/NXP Funding LLC/NXP USA, Inc., 2.70%, 05/01/25(c)		190		178,458
Texas Instruments, Inc. 1.75%, 05/04/30		482		396,238
2.70%, 09/15/51(c)		870		597,884
				9,535,608
Software — 0.4%
Activision Blizzard, Inc., 2.50%, 09/15/50		125		76,763
Electronic Arts, Inc., 2.95%, 02/15/51		250		161,298
Intuit, Inc., 1.65%, 07/15/30		71		56,935
Microsoft Corp. 2.53%, 06/01/50		325		213,866
3.04%, 03/17/62		365		252,186
Oracle Corp. 2.50%, 04/01/25		1,145		1,079,594
2.95%, 05/15/25		800		759,006
2.88%, 03/25/31		615		509,913
3.95%, 03/25/51(c)		300		213,732
3.85%, 04/01/60		285		189,364
Roper Technologies, Inc., 3.65%, 09/15/23		310		306,693
ServiceNow, Inc., 1.40%, 09/01/30		72		55,081
				3,874,431
Technology Hardware, Storage & Peripherals — 0.4%
Adobe, Inc., 2.15%, 02/01/27		2,090		1,902,120
Apple, Inc. 3.00%, 06/20/27(c)		925		871,089
1.40%, 08/05/28		850		720,036
2.70%, 08/05/51		890		586,724
3.95%, 08/08/52		45		38,236
2.55%, 08/20/60(c)		95		57,485

30 2 0 2 2   BLACK ROCK  ANNUAL  REPORT  TO   SHAREHOLDERS

Schedule of Investments  (continued) December 31, 2022 Advantage CoreAlpha Bond Master Portfolio (Percentages shown are based on Net Assets)

Security	Par (000)		Value
Technology Hardware, Storage & Peripherals (continued)
Apple, Inc. (continued) 2.85%, 08/05/61	$	450	$	289,364
4.10%, 08/08/62		270		224,427
				4,689,481
Tobacco — 1.5%
Altria Group, Inc. 4.80%, 02/14/29(c)		2,415		2,317,260
2.45%, 02/04/32		1,550		1,169,311
5.80%, 02/14/39(c)		1,127		1,039,170
4.45%, 05/06/50		215		152,240
3.70%, 02/04/51		430		269,318
4.00%, 02/04/61		365		236,855
BAT Capital Corp. 2.26%, 03/25/28		449		372,635
4.91%, 04/02/30		673		616,184
2.73%, 03/25/31		1,110		866,041
7.75%, 10/19/32		955		1,027,174
4.39%, 08/15/37		510		396,526
3.73%, 09/25/40		125		84,878
4.54%, 08/15/47		560		395,682
4.76%, 09/06/49		335		242,629
Philip Morris International, Inc. 0.88%, 05/01/26		2,670		2,345,635
2.10%, 05/01/30		670		541,835
5.75%, 11/17/32		710		723,793
6.38%, 05/16/38		2,010		2,139,589
4.25%, 11/10/44(c)		640		513,819
Reynolds American, Inc., 5.85%, 08/15/45		420		357,755
				15,808,329
Transportation Infrastructure — 0.0%
United Parcel Service, Inc., 5.30%, 04/01/50(c)		280		290,527
Utilities — 0.2%
American Water Capital Corp., 2.80%, 05/01/30		270		233,451
Essential Utilities, Inc. 3.57%, 05/01/29		630		565,103
2.70%, 04/15/30		380		318,720
Vistra Operations Co. LLC, 5.00%, 07/31/27(a)		1,250		1,160,117
				2,277,391
Wireless Telecommunication Services — 0.8%
American Tower Corp., 1.30%, 09/15/25		680		613,819
GLP Capital LP/GLP Financing II, Inc. 5.75%, 06/01/28		1,145		1,122,706
5.30%, 01/15/29		895		846,974
Realty Income Corp., 5.63%, 10/13/32(c)		170		172,657
Rogers Communications, Inc.(a) 3.20%, 03/15/27(c)		520		481,138
3.80%, 03/15/32		660		569,549
4.50%, 03/15/42		650		529,794
4.55%, 03/15/52		250		193,822
T-Mobile USA, Inc. 3.50%, 04/15/25		25		24,043
4.50%, 04/15/50		335		275,416
3.30%, 02/15/51		245		163,499
5.65%, 01/15/53		1,195		1,156,628

Security	Par (000)		Value
Wireless Telecommunication Services (continued)
T-Mobile USA, Inc. (continued) 3.60%, 11/15/60	$	600	$	396,163
5.80%, 09/15/62		985		952,937
Uniti Group LP/Uniti Group Finance, Inc./CSL Capital LLC, 6.50%, 02/15/29(a)(c)		813		538,612
				8,037,757
Total Corporate Bonds — 34.9% (Cost: $403,189,249)				362,241,762
Foreign Agency Obligations
Indonesia — 0.1%
Indonesia Government International Bond, 4.75%, 07/18/47(a)		500		453,180
Israel — 0.0%
State of Israel, 3.38%, 01/15/50		390		296,839
Mexico — 0.2%
Mexico Government International Bond 4.15%, 03/28/27(c)		1,145		1,118,092
6.05%, 01/11/40(c)		100		97,050
4.50%, 01/31/50		340		258,676
3.77%, 05/24/61		735		465,485
				1,939,303
Panama — 0.0%
Panama Government International Bond, 3.87%, 07/23/60		420		270,585
Peru — 0.0%
Peruvian Government International Bond, 3.55%, 03/10/51(c)		455		323,278
Philippines — 0.0%
Philippines Government International Bond, 2.65%, 12/10/45		200		134,022
Uruguay — 0.1%
Uruguay Government International Bond 5.10%, 06/18/50		1,000		986,000
4.98%, 04/20/55		50		48,125
				1,034,125
Total Foreign Agency Obligations — 0.4% (Cost: $5,422,114)				4,451,332
Municipal Bonds
California — 0.2%
Bay Area Toll Authority, RB, BAB
Series F-2, 6.26%, 04/01/49		100		115,132
Series S-1, 6.92%, 04/01/40		50		57,306
Bay Area Toll Authority, Refunding RB, Series F-3, 3.13%, 04/01/55		540		360,730
California State University, Refunding RB, Series B, 2.98%, 11/01/51		595		406,270
Regents of the University of California Medical Center Pooled Revenue, RB
Series N, 3.01%, 05/15/50		120		79,269

MASTER  PORTFOLIO  SCHEDULE  OF  INVESTMENTS 31

Schedule of Investments  (continued) December 31, 2022 Advantage CoreAlpha Bond Master Portfolio (Percentages shown are based on Net Assets)

Security	Par (000)		Value
California (continued)
Regents of the University of California Medical Center Pooled Revenue, RB (continued)
Series N, 3.71%, 05/15/2120	$	85	$	53,415
State of California, GO, BAB, 7.60%, 11/01/40		300		384,222
State of California, Refunding GO, 3.50%, 04/01/28		500		468,966
University of California, RB, Series AD, 4.86%, 05/15/2112		115		97,624
University of California, Refunding RB, Series J, 4.13%, 05/15/45		150		131,662
				2,154,596
District of Columbia — 0.0%
District of Columbia Water & Sewer Authority, Refunding RB, Series D, Subordinate Lien, 3.21%, 10/01/48		200		141,838
Florida — 0.0%
State Board of Administration Finance Corp., RB, Series A, 2.15%, 07/01/30		119		97,221
Illinois — 0.1%
Chicago O’Hare International Airport, ARB, Series C, Senior Lien, 4.47%, 01/01/49		110		98,146
Sales Tax Securitization Corp., Refunding RB, Series B, 2nd Lien, 3.24%, 01/01/42		140		103,893
State of Illinois, GO, 5.10%, 06/01/33		255		243,855
				445,894
Louisiana — 0.0%
Louisiana Local Government Environmental Facilities & Community Development Authority, RB, Class A-4, 4.48%, 08/01/39		65		59,964
Maryland — 0.0%
Maryland Health & Higher Educational Facilities Authority, Refunding RB
Series D, 3.05%, 07/01/40		115		81,184
Series D, 3.20%, 07/01/50		80		53,160
				134,344
Massachusetts — 0.0%
Commonwealth of Massachusetts, GO, Series H, 2.90%, 09/01/49		295		198,834
Michigan — 0.0%
University of Michigan, RB
Series A, 3.50%, 04/01/52(c)		38		29,645
Series A, 4.45%, 04/01/2122		69		56,073
Series B, 3.50%, 04/01/52		67		52,267
University of Michigan, Refunding RB, Series C, 3.60%, 04/01/47		238		201,333
				339,318
New Jersey — 0.0%
New Jersey Turnpike Authority, RB, BAB, Series A, 7.10%, 01/01/41		150		180,268
New York — 0.2%
Metropolitan Transportation Authority, RB, BAB, 6.81%, 11/15/40		355		383,764
New York City Municipal Water Finance Authority, Refunding RB, 5.88%, 06/15/44		250		274,098

Security	Par (000)		Value
New York (continued)
New York City Transitional Finance Authority Future Tax Secured Revenue, RB, BAB, 5.51%, 08/01/37	$	110	$	111,290
New York State Dormitory Authority, Refunding RB, Series B, 3.14%, 07/01/43		255		198,171
Port Authority of New York & New Jersey, ARB 210th Series, 4.03%, 09/01/48		500		417,436
Consolidated, 192nd Series, 4.81%, 10/15/65		50		46,556
Port Authority of New York & New Jersey, RB, 191th Series, 4.82%, 06/01/45		200		187,967
				1,619,282
Oklahoma — 0.0%
Oklahoma Development Finance Authority, RB, Class A2, 4.62%, 06/01/44		110		101,969
Pennsylvania — 0.0%
Pennsylvania State University, Refunding RB, Series D, 2.84%, 09/01/50		80		54,693
Texas — 0.1%
Board of Regents of the University of Texas System, Refunding RB, Series B, 2.44%, 08/15/49(c)		105		66,259
Dallas Area Rapid Transit, Refunding RB, Series A, Senior Lien, 2.61%, 12/01/48		100		65,032
Dallas Fort Worth International Airport, Refunding RB, 2.84%, 11/01/46		260		184,625
Grand Parkway Transportation Corp., Refunding RB, Subordinate, 3.24%, 10/01/52		100		71,492
Texas Transportation Commission State Highway Fund, Refunding RB, 4.00%, 10/01/33		690		632,827
				1,020,235
Virginia — 0.0%
University of Virginia, Refunding RB, Series U, 2.58%, 11/01/51		60		38,246
Total Municipal Bonds — 0.6% (Cost: $8,455,676)				6,586,702
Non-Agency Mortgage-Backed Securities
Collateralized Mortgage Obligations — 5.0%
American Home Mortgage Investment Trust, Series 2004-3, Class 4A, (6 mo. LIBOR US + 1.50%), 3.60%, 10/25/34(b)		7		7,320
Citigroup Mortgage Loan Trust(a)(b)
Series 2013-A, Class A, 3.00%, 05/25/42		5		4,821
Series 2014-A, Class A, 4.00%, 01/25/35		32		30,082
Connecticut Avenue Securities Trust(a)(b)
Series 2019-R01, Class 2M2, (1 mo. LIBOR US + 2.45%), 6.84%, 07/25/31		801		799,340
Series 2019-R02, Class 1M2, (1 mo. LIBOR US + 2.30%), 6.69%, 08/25/31		1,134		1,132,535
Series 2019-R03, Class 1M2, (1 mo. LIBOR US + 2.15%), 6.54%, 09/25/31		901		898,707
Series 2019-R06, Class 2M2, (1 mo. LIBOR US + 2.10%), 6.49%, 09/25/39		102		101,964
Series 2019-R07, Class 1M2, (1 mo. LIBOR US + 2.10%), 6.49%, 10/25/39		333		332,549

32 2 0 2 2   BLACK ROCK  ANNUAL  REPORT  TO   SHAREHOLDERS

Schedule of Investments  (continued) December 31, 2022 Advantage CoreAlpha Bond Master Portfolio (Percentages shown are based on Net Assets)

Security	Par (000)		Value
Collateralized Mortgage Obligations (continued)
Connecticut Avenue Securities Trust(a)(b) (continued)
Series 2019-R07, Class 1M2, (1 mo. LIBOR US + 2.40%), 6.79%, 04/25/31	$	891	$	888,632
Series 2021-R01, Class 1M1, (30 day SOFR + 0.75%), 4.68%, 10/25/41		1,740		1,724,747
Series 2021-R01, Class 1M2, (30 day SOFR + 1.55%), 5.48%, 10/25/41		3,040		2,962,653
Series 2022-R01, Class 1M1, (30 day SOFR + 1.00%), 4.93%, 12/25/41		5,087		5,021,988
Series 2022-R02, Class 2M1, (30 day SOFR + 1.20%), 5.13%, 01/25/42		4,578		4,477,239
Credit Suisse First Boston Mortgage Securities Corp., Series 2004-6, Class 3A1, 5.00%, 09/25/19		5		2,774
Fannie Mae Connecticut Avenue Securities(b)
Series 2017-C05, Class 1EB3, (1 mo. LIBOR US + 1.20%), 5.59%, 01/25/30		1,648		1,643,363
Series 2018-C01, Class 1ED2, (1 mo. LIBOR US + 0.85%), 5.24%, 07/25/30		426		423,894
Series 2018-C01, Class 1M2C, (1 mo. LIBOR US + 2.25%), 6.64%, 07/25/30		2,150		2,137,101
Series 2021-R02, Class 2M1, (30 day SOFR + 0.90%), 4.83%, 11/25/41(a)		842		827,176
Freddie Mac STACR REMIC Trust(a)(b)
Series 2020-DNA1, Class M2, (1 mo. LIBOR US + 1.70%), 6.09%, 01/25/50		3,522		3,511,005
Series 2020-HQA4, Class M2, (1 mo. LIBOR US + 3.15%), 7.54%, 09/25/50		28		27,655
Series 2021-DNA3, Class M1, (30 day SOFR + 0.75%), 4.68%, 10/25/33		304		301,936
Series 2021-DNA3, Class M2, (30 day SOFR + 2.10%), 6.03%, 10/25/33		670		656,918
Series 2021-DNA5, Class M2, (30 day SOFR + 1.65%), 5.58%, 01/25/34		1,598		1,575,901
Series 2021-DNA6, Class M1, (30 day SOFR + 0.80%), 4.73%, 10/25/41		4,090		4,036,746
Series 2021-HQA1, Class M1, (30 day SOFR + 0.70%), 4.63%, 08/25/33		320		317,808
Series 2021-HQA2, Class M1, (30 day SOFR + 0.70%), 4.63%, 12/25/33		1,342		1,331,465
Series 2022-HQA1, Class M1A, (30 day SOFR + 2.10%), 6.03%, 03/25/42		1,188		1,172,484
Freddie Mac Structured Agency Credit Risk Debt Notes(b)
Series 2017-DNA1, Class M2, (1 mo. LIBOR US + 3.25%), 7.64%, 07/25/29		4,844		4,980,643
Series 2017-HQA2, Class M2, (1 mo. LIBOR US + 2.65%), 7.04%, 12/25/29		673		670,323
Series 2017-HQA3, Class M2, (1 mo. LIBOR US + 2.35%), 6.74%, 04/25/30		4,057		4,070,884
Series 2020-HQA5, Class M2, (30 day SOFR + 2.60%), 6.53%, 11/25/50(a)		4,482		4,472,103
Series 2021-DNA2, Class M1, (30 day SOFR + 0.80%), 4.73%, 08/25/33(a)		456		455,128

Security	Par (000)		Value
Collateralized Mortgage Obligations (continued)
STACR Trust(a)(b)
Series 2018-HRP1, Class M2, (1 mo. LIBOR US + 1.65%), 6.04%, 04/25/43	$	640	$	639,099
Series 2018-HRP1, Class M2B, (1 mo. LIBOR US + 1.65%), 6.04%, 04/25/43		189		188,316
				51,825,299
Commercial Mortgage-Backed Securities — 3.0%
Bank
Class A3, 3.97%, 09/15/60		2,800		2,623,908
Series 2019-BN23, Class A3, 2.92%, 12/15/52		1,540		1,336,301
Benchmark Mortgage Trust, Series 2019-B10, Class A4, 3.72%, 03/15/62		2,390		2,207,176
Citigroup Commercial Mortgage Trust
Series 2016-C1, Class A4, 3.21%, 05/10/49		1,290		1,199,573
Series 2016-GC36, Class A5, 3.62%, 02/10/49		550		516,851
Series 2017-P8, Class AS, 3.79%, 09/15/50(b)		2,090		1,882,750
Commercial Mortgage Trust
Series 2013-CR11, Class B, 5.11%, 08/10/50(b)		380		370,676
Series 2014-CR17, Class A5, 3.98%, 05/10/47		670		653,537
Series 2016-DC2, Class A4, 3.50%, 02/10/49		2,260		2,140,869
Series 2017-COR2, Class A3, 3.51%, 09/10/50		1,290		1,184,773
Eleven Madison Trust Mortgage Trust, Series 2015-11MD, Class A, 3.55%, 09/10/35(a)(b)		150		138,536
GS Mortgage Securities Trust
Series 2013-GC13, Class A5, 4.04%, 07/10/46(b)		170		168,650
Series 2014-GC20, Class A5, 4.00%, 04/10/47		730		713,339
Series 2015-GC30, Class B, 4.02%, 05/10/50(b)		300		275,180
Series 2015-GS1, Class A3, 3.73%, 11/10/48		2,030		1,926,509
JP Morgan Chase Commercial Mortgage Securities Trust, Series 2006-CB16, Class B, 5.67%, 05/12/45(b)(d)		210		10,823
JPMBB Commercial Mortgage Securities Trust
Series 2013-C14, Class A4, 4.13%, 08/15/46(b)		324		321,761
Series 2013-C17, Class A3, 3.93%, 01/15/47		757		742,773
Series 2014-C25, Class AS, 4.07%, 11/15/47		2,180		2,077,661
Series 2015-C31, Class A3, 3.80%, 08/15/48		1,085		1,031,812
Series 2016-C1, Class A5, 3.58%, 03/17/49		810		765,319
JPMDB Commercial Mortgage Securities Trust, Series 2017-C5, Class A5, 3.69%, 03/15/50		1,160		1,083,808
Morgan Stanley Bank of America Merrill Lynch Trust, Series 2013-C13, Class A4, 4.04%, 11/15/46		460		450,977
Morgan Stanley Capital I Trust
Series 2015-MS1, Class A4, 3.78%, 05/15/48(b)		550		525,938
Series 2019-L3, Class AS, 3.49%, 11/15/52		970		827,662
Series 2020-L4, Class A3, 2.70%, 02/15/53		3,070		2,586,579
Wells Fargo Commercial Mortgage Trust
Series 2014-LC18, Class AS, 3.81%, 12/15/47		510		480,904
Series 2015-C26, Class AS, 3.58%, 02/15/48		1,380		1,301,547
WFRBS Commercial Mortgage Trust
Series 2012-C10, Class AS, 3.24%, 12/15/45		137		134,207
Series 2013-C18, Class A5, 4.16%, 12/15/46(b)		620		607,841
Series 2014-C23, Class A4, 3.65%, 10/15/57		262		252,834
Series 2014-C23, Class AS, 4.21%, 10/15/57(b)		1,140		1,091,496
				31,632,570
Total Non-Agency Mortgage-Backed Securities — 8.0% (Cost: $87,723,913)				83,457,869

MASTER  PORTFOLIO  SCHEDULE  OF  INVESTMENTS 33

Schedule of Investments  (continued) December 31, 2022 Advantage CoreAlpha Bond Master Portfolio (Percentages shown are based on Net Assets)

Security	Par (000)			Value
U.S. Government Sponsored Agency Securities
Collateralized Mortgage Obligations(a)(b) — 0.4%
Freddie Mac STACR REMIC Trust
Series 2019-HQA4, Class M2, (1 mo. LIBOR US + 2.05%), 6.44%, 11/25/49	$	375		$	374,025
Series 2020-HQA1, Class M2, (1 mo. LIBOR US + 1.90%), 6.29%, 01/25/50		1,334			1,321,828
Freddie Mac STACR Trust
Series 2019-DNA4, Class M2, (1 mo. LIBOR US + 1.95%), 6.34%, 10/25/49		703			758,261
Series 2019-FTR2, Class M1, (1 mo. LIBOR US + 0.95%), 5.34%, 11/25/48		1,673			1,655,610
					4,109,724
Mortgage-Backed Securities — 31.1%
Fannie Mae(b)
Series 2014-M3, Class A2, 3.50%, 01/25/24		516			506,821
Series 2016-M13, Class A2, 2.51%, 09/25/26		620			574,542
Series 2018-M1, Class A2, 2.99%, 12/25/27		1,144			1,067,063
Series 2018-M7, Class A2, 3.03%, 03/25/28		1,467			1,370,371
Series 2018-M8, Class A2, 3.30%, 06/25/28		3,407			3,236,257
Fannie Mae Mortgage-Backed Securities 2.50%, 04/01/37		100			91,539
3.00%, 02/01/47		70			63,559
4.00%, 02/01/47 - 02/01/57		1,234			1,180,781
3.50%, 11/01/51		3,571			3,289,767
(11th District Cost of Funds + 1.25%), 2.36%, 09/01/34(b)		76			72,552
(12 mo. LIBOR US + 1.40%), 2.15%, 04/01/35(b)		26			25,121
(12 mo. LIBOR US + 1.53%), 3.21%, 05/01/43(b)		16			16,336
(12 mo. LIBOR US + 1.54%), 3.38%, 06/01/43(b)		33			32,997
(12 mo. LIBOR US + 1.71%), 3.08%, 04/01/40(b)		3			2,830
(12 mo. LIBOR US + 1.75%), 4.00%, 08/01/41(b)		22			22,357
(12 mo. LIBOR US + 1.78%), 3.45%, 01/01/42(b)		7			6,763
(12 mo. LIBOR US + 1.81%), 2.24%, 02/01/42(b)		1			957
(12 mo. LIBOR US + 1.82%), 4.07%, 09/01/41(b)		20			19,850
(6 mo. LIBOR US + 1.04%), 3.16%, 05/01/33(b)		3			2,836
(6 mo. LIBOR US + 1.36%), 2.70%, 10/01/32(b)		10			9,661
Freddie Mac Mortgage-Backed Securities 4.50%, 05/01/24 - 01/01/49		1,095			1,081,429
4.00%, 10/01/24 - 01/01/49		4,063			3,897,602
5.00%, 08/01/25 - 03/01/48		352			355,186
3.50%, 04/01/26 - 04/01/49		6,266			5,846,931
2.50%, 02/01/27		367			352,435
3.00%, 05/01/27 - 10/01/47		5,256			4,766,078
6.00%, 11/01/28 - 04/01/38		213			220,679
6.50%, 06/01/29 - 08/01/36		225			239,163
7.50%, 12/01/30		—	(f)		343
5.50%, 05/01/33 - 08/01/38		530			539,666
(1 year CMT + 2.34%), 2.83%, 04/01/32(b)		21			20,740
(11th District Cost of Funds + 1.25%), 2.60%, 11/01/27(b)		35			34,395

Security	Par (000)		Value
Mortgage-Backed Securities (continued)
Freddie Mac Mortgage-Backed Securities (continued)
(12 mo. LIBOR US + 1.50%), 3.25%, 06/01/43(b)	$	1	$	745
(12 mo. LIBOR US + 1.60%), 2.39%, 08/01/43(b)		8		7,812
(12 mo. LIBOR US + 1.65%), 2.45%, 05/01/43(b)		35		35,047
(12 mo. LIBOR US + 1.73%), 3.77%, 08/01/41(b)		21		20,807
(12 mo. LIBOR US + 1.75%), 2.82%, 04/01/38(b)		30		29,311
(12 mo. LIBOR US + 1.75%), 2.19%, 02/01/40(b)		20		19,436
(12 mo. LIBOR US + 1.79%), 4.04%, 09/01/32(b)		1		1,477
(12 mo. LIBOR US + 1.89%), 4.00%, 07/01/41(b)		10		10,121
(12 mo. LIBOR US + 1.90%), 3.21%, 01/01/42(b)		1		654
Freddie Mac Multifamily Structured Pass Through
Certificates
Series K055, Class A2, 2.67%, 03/25/26		1,590		1,500,401
Series K060, Class A2, 3.30%, 10/25/26		1,190		1,138,404
Series K061, Class A2, 3.35%, 11/25/26(b)		1,590		1,521,580
Series K072, Class A2, 3.44%, 12/25/27		1,190		1,137,941
Freddie Mac Multifamily Structured Pass-Through Certificates, Series K076, Class A2, 3.90%, 04/25/28		2,390		2,329,405
Ginnie Mae Mortgage-Backed Securities 6.50%, 06/15/28 - 07/15/38		49		51,708
7.50%, 08/20/30		2		2,094
6.00%, 01/15/32 - 10/20/38		119		125,897
5.00%, 11/20/33 - 05/20/49		1,027		1,042,040
5.50%, 05/20/36 - 04/20/48		354		367,127
4.50%, 03/15/39 - 01/23/53(g)		3,386		3,306,183
4.00%, 09/15/40 - 01/23/53(g)		5,429		5,207,152
3.50%, 01/15/41 - 01/23/53(g)		9,979		9,281,615
3.00%, 01/20/43 - 01/23/53(g)		12,787		11,497,255
2.50%, 12/20/46 - 01/23/53		18,523		15,993,043
2.00%, 08/20/50 - 01/23/53(h)		16,248		13,623,940
Uniform Mortgage-Backed Securities 5.00%, 01/01/24 - 01/12/53(g)		5,893		5,850,165
4.00%, 06/01/24 - 01/12/53(g)		33,154		31,280,825
4.50%, 11/01/24 - 01/12/53(g)		7,159		6,973,437
3.00%, 12/01/26 - 01/12/53(g)		30,499		27,310,792
2.50%, 09/01/28 - 01/12/53(g)		61,670		53,162,935
7.50%, 09/01/29		2		1,756
6.50%, 12/01/30 - 01/01/36		388		401,457
3.50%, 11/01/31 - 06/01/49		14,917		13,948,582
6.00%, 11/01/31 - 09/01/38		494		508,637
7.00%, 01/01/32 - 06/01/32		14		15,130
5.50%, 10/01/32 - 01/01/47		1,840		1,896,548

34 2 0 2 2   BLACK ROCK  ANNUAL  REPORT  TO   SHAREHOLDERS

Schedule of Investments  (continued) December 31, 2022 Advantage CoreAlpha Bond Master Portfolio (Percentages shown are based on Net Assets)

Security	Par (000)			Value
Mortgage-Backed Securities (continued)
Uniform Mortgage-Backed Securities (continued)
2.00%, 12/01/35 - 01/12/53(g)	$	88,454		$	73,759,409
1.50%, 03/01/36 - 11/01/51		13,247			10,813,974
					323,122,449
Total U.S. Government Sponsored Agency Securities — 31.5% (Cost: $366,092,661)					327,232,173
Total Long-Term Investments — 85.6% (Cost: $981,270,917)					889,866,678
	Shares
Short-Term Securities
Money Market Funds — 17.6%
BlackRock Cash Funds: Institutional, SL Agency Shares, 4.53%(i)(j)(k)		182,942,351			182,997,233
BlackRock Cash Funds: Treasury, SL Agency Shares, 4.12%(i)(j)		100,000			100,000
					183,097,233
	Par (000)
U.S. Government Sponsored Agency Securities — 0.1%
Freddie Mac Mortgage-Backed Securities, 5.00%, 07/01/23	$	1			819
Freddie Mac Multifamily Structured Pass Through Certificates, Series K031, Class A2, 3.30%, 04/25/23(b)		260			258,940
Uniform Mortgage-Backed Securities, 4.50%, 04/01/23		—	(f)		72
					259,831
U.S. Treasury Obligations — 14.2%
U.S. Treasury Bills(l) 4.34%, 03/16/23(c)		124,000			122,971,668
4.45%, 03/30/23		25,000			24,743,904
					147,715,572
Total Short-Term Securities — 31.9% (Cost: $331,013,460)					331,072,636
Total Investments Before TBA Sale Commitments — 117.5% (Cost: $1,312,284,377)					1,220,939,314

Security	Par (000)			Value
TBA Sale Commitments(g)
Mortgage-Backed Securities — (1.9)%
Uniform Mortgage-Backed Securities 2.00%, 01/12/53	$	(1,500	)	$	(1,220,191	)
2.50%, 01/12/53		(19,800	)		(16,760,983	)
3.50%, 02/25/49		(782	)		(710,111	)
4.00%, 01/12/53		(700	)		(656,362	)
Total TBA Sale Commitments — (1.9)% (Proceeds: $(19,842,405))					(19,347,647	)
Total Investments, Net of TBA Sale Commitments — 115.6% (Cost: $1,292,441,972)					1,201,591,667
Liabilities in Excess of Other Assets — (15.6)%					(162,225,807	)
Net Assets — 100.0%				$	1,039,365,860

^(a)  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.

^(b)  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.

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

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

^(e)  Step coupon security. Coupon rate will either increase (step-up bond) or decrease (step-down bond) at regular intervals until maturity. Interest rate shown reflects the rate currently in effect.

^(f)  Rounds to less than 1,000.

^(g)  Represents or includes a TBA transaction.

^(h)  All or a portion of the security has been pledged as collateral in connection with outstanding TBA commitments.

⁽ⁱ⁾  Affiliate of the Master Portfolio.

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

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

^(l)  Rates are discount rates or a range of discount rates as of period end.

MASTER  PORTFOLIO  SCHEDULE  OF  INVESTMENTS 35

Schedule of Investments  (continued) December 31, 2022 Advantage CoreAlpha Bond Master Portfolio

Affiliates

Investments in issuers considered to be affiliate(s) of the Master Portfolio during the year ended December 31, 2022 for purposes of Section 2(a)(3) of the Investment Company Act of 1940, as amended, were as follows:

Affiliated Issuer		Value at 12/31/21		Purchases at Cost			Proceeds from Sales			Net Realized Gain (Loss)			Change in Unrealized Appreciation (Depreciation)			Value at 12/31/22		Shares Held at 12/31/22		Income			Capital Gain Distributions from Underlying Funds
BlackRock Cash Funds: Institutional, SL Agency Shares		$	67,351,856	$	115,614,792	(a)		$	—		$	6,281		$	24,304	$	182,997,233		182,942,351	$	1,770,818	(b)		$	—
BlackRock Cash Funds: Treasury, SL Agency Shares	��		100,000		—				—			—			—		100,000		100,000		1,595				—
											$	6,281		$	24,304	$	183,097,233			$	1,772,413			$	—

^(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.

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
10-Year Canadian Bond		148		03/22/23	$	13,395	$	(484,397	)
10-Year U.S. Treasury Note		1,060		03/22/23		118,869		(811,052	)
10-Year U.S. Ultra Long Treasury Note		179		03/22/23		21,102		(225,188	)
U.S. Long Bond		565		03/22/23		70,448		(2,136,750	)
Ultra U.S. Treasury Bond		316		03/22/23		42,196		(527,553	)
5-Year U.S. Treasury Note		639		03/31/23		68,902		(977,664	)
								(5,162,604	)
Short Contracts
Euro BTP		27		03/08/23		3,148		262,833
Euro Bund		261		03/08/23		37,139		2,472,126
Euro OAT		87		03/08/23		11,855		925,621
10-Year Australian Treasury Bonds		82		03/15/23		6,458		219,667
Long Gilt		25		03/29/23		3,019		177,862
2-Year U.S. Treasury Note		79		03/31/23		16,195		(12,464	)
								4,045,645
							$	(1,116,959	)

Forward Foreign Currency Exchange Contracts

Currency Purchased		Currency Sold		Counterparty	Settlement Date		Unrealized Appreciation (Depreciation)
USD	59,133	CAD	80,000	HSBC Bank PLC		03/15/23	$	16
USD	1,578,109	GBP	1,280,000	Deutsche Bank AG		03/15/23		27,962
USD	398,201	HKD	3,100,000	Royal Bank of Canada		03/15/23		515
								28,493
USD	95,719	CAD	130,000	HSBC Bank PLC		03/15/23		(347	)
USD	279,380	CAD	380,000	Royal Bank of Canada		03/15/23		(1,427	)
								(1,774	)
							$	26,719

36 2 0 2 2   BLACK ROCK  ANNUAL  REPORT  TO   SHAREHOLDERS

Schedule of Investments  (continued) December 31, 2022 Advantage CoreAlpha Bond Master Portfolio

Centrally Cleared Credit Default Swaps — Buy Protection

Reference Obligation/Index	Financing Rate Paid by the Master Portfolio			Payment Frequency	Termination Date	Notional Amount (000)		Value			Upfront Premium Paid (Received)			Unrealized Appreciation (Depreciation)
CDX.NA.HY.39.V1		5.00	%	Quarterly	12/20/27	USD	48,816	$	(379,223	)		$2,208,406		$	(2,587,629	)
CDX.NA.IG.39.V1		1.00		Quarterly	12/20/27	USD	133,300		(1,114,193	)		(186,405	)		(927,788	)
								$	(1,493,416	)	$	2,022,001		$	(3,515,417	)

Centrally Cleared Inflation Swaps

Paid by the Master Portfolio		Received by the Master Portfolio		Termination Date		Notional Amount (000)			Value		Upfront Premium Paid (Received)		Unrealized Appreciation (Depreciation)
Reference	Frequency	Rate	Frequency
2.07%	Monthly	Eurostat Eurozone HICP Ex Tobacco Unrevised	Monthly		02/15/32		EUR	2,635	$	302,126	$	62	$	302,064
2.74%	Monthly	Eurostat Eurozone HICP Ex Tobacco Unrevised	Monthly		06/15/32		EUR	2,630		31,219		59		31,160
									$	333,345	$	121	$	333,224

Centrally Cleared Interest Rate Swaps

Paid by the Master Portfolio		Received by the Master Portfolio		Effective Date			Termination Date		Notional Amount (000)		Value			Upfront Premium Paid (Received)			Unrealized Appreciation (Depreciation)
Rate	Frequency	Rate	Frequency
3.12%	Annual	6-Month EURIBOR, 2.69%	Semi-Annual		03/15/23	(a)		03/15/25	EUR	152,360	$	1,064,513		$	285,471		$	779,042
0.18%	Annual	1-Day FEDL, 4.33%	Annual		N/A			10/20/25	USD	2,500		278,683			—			278,683
1-Day SOFR, 4.32%	Annual	0.18%	Annual		N/A			10/20/25	USD	2,500		(278,594	)		—			(278,594	)
2.98%	Annual	6-Month EURIBOR, 2.69%	Semi-Annual		03/15/23	(a)		03/15/26	EUR	10,680		116,990			32,391			84,599
3.51%	Semi-Annual	3-Month Canada Bank Acceptance, 4.94%	Semi-Annual		03/15/23	(a)		03/15/26	CAD	2,570		25,897			620			25,277
1-Day SOFR, 4.32%	Annual	3.71%	Annual		03/15/23	(a)		03/15/26	USD	5,610		(42,612	)		(384	)		(42,228	)
3.88%	Quarterly	3-Month BBSW, 3.26%	Quarterly		03/15/23	(a)		03/15/26	AUD	3,100		10,027			(9,545	)		19,572
1-Day SONIA, 3.43%	Annual	4.01%	Annual		03/15/23	(a)		03/15/26	GBP	1,590		(17,650	)		(8,013	)		(9,637	)
8.30%	Monthly	1-Month MXIBOR, 10.77%	Monthly		03/15/23	(a)		03/08/28	MXN	9,780		7,846			5			7,841
9.00%	Monthly	1-Month MXIBOR, 10.77%	Monthly		03/15/23	(a)		03/08/28	MXN	21,410		(13,170	)		10			(13,180	)
9.07%	Monthly	1-Month MXIBOR, 10.77%	Monthly		03/15/23	(a)		03/08/28	MXN	11,140		(8,308	)		5			(8,313	)
1-Day SSARON, 0.94%	Annual	1.41%	Annual		03/15/23	(a)		03/15/28	CHF	650		(16,354	)		1,182			(17,536	)
1-Day SSARON, 0.94%	Annual	1.54%	Annual		03/15/23	(a)		03/15/28	CHF	810		(15,296	)		10			(15,306	)
1-Day SSARON, 0.94%	Annual	1.56%	Annual		03/15/23	(a)		03/15/28	CHF	770		(13,456	)		2,212			(15,668	)
1-Day SSARON, 0.94%	Annual	1.59%	Annual		03/15/23	(a)		03/15/28	CHF	660		(10,458	)		360			(10,818	)
1-Day SSARON, 0.94%	Annual	1.70%	Annual		03/15/23	(a)		03/15/28	CHF	520		(5,449	)		6			(5,455	)
1-Day SSARON, 0.94%	Annual	1.73%	Annual		03/15/23	(a)		03/15/28	CHF	750		(6,442	)		2,656			(9,098	)
1-Day SSARON, 0.94%	Annual	1.73%	Annual		03/15/23	(a)		03/15/28	CHF	360		(3,259	)		4			(3,263	)
1-Day SSARON, 0.94%	Annual	2.06%	Annual		03/15/23	(a)		03/15/28	CHF	920		7,807			10			7,797
1-Day SSARON, 0.94%	Annual	2.06%	Annual		03/15/23	(a)		03/15/28	CHF	820		6,660			9			6,651
1-Day SSARON, 0.94%	Annual	2.10%	Annual		03/15/23	(a)		03/15/28	CHF	510		5,175			6			5,169
1-Day THOR, 1.25%	Quarterly	2.21%	Quarterly		03/15/23	(a)		03/15/28	THB	25,580		(1,633	)		8			(1,641	)
1-Day THOR, 1.25%	Quarterly	2.24%	Quarterly		03/15/23	(a)		03/15/28	THB	5,075		(101	)		2			(103	)
1-Day THOR, 1.25%	Quarterly	2.24%	Quarterly		03/15/23	(a)		03/15/28	THB	10,170		(245	)		3			(248	)
1-Day THOR, 1.25%	Quarterly	2.25%	Quarterly		03/15/23	(a)		03/15/28	THB	5,075		(4	)		2			(6	)
1-Day THOR, 1.25%	Quarterly	2.26%	Quarterly		03/15/23	(a)		03/15/28	THB	10,170		138			3			135
6-Month EURIBOR, 2.69%	Semi-Annual	2.84%	Annual		03/15/23	(a)		03/15/28	EUR	64,010		(1,337,431	)		(353,061	)		(984,370	)
2.92%	Semi-Annual	1-Day SORA, 2.53%	Semi-Annual		03/15/23	(a)		03/15/28	SGD	590		3,686			5			3,681
2.92%	Semi-Annual	1-Day SORA, 2.53%	Semi-Annual		03/15/23	(a)		03/15/28	SGD	590		3,746			5			3,741
3.01%	Semi-Annual	1-Day SORA, 2.53%	Semi-Annual		03/15/23	(a)		03/15/28	SGD	3,755		11,723			30			11,693
6-Month EURIBOR, 2.69%	Semi-Annual	3.04%	Annual		03/15/23	(a)		03/15/28	EUR	260		(2,945	)		3			(2,948	)
3.11%	Annual	3-Month STIBOR, 2.70%	Quarterly		03/15/23	(a)		03/15/28	SEK	7,220		5,613			681			4,932
3.19%	Annual	3-Month STIBOR, 2.70%	Quarterly		03/15/23	(a)		03/15/28	SEK	3,840		1,747			4			1,743
3.23%	Annual	3-Month STIBOR, 2.70%	Quarterly		03/15/23	(a)		03/15/28	SEK	3,590		939			(655	)		1,594
3.24%	Semi-Annual	1-Day SORA, 2.53%	Semi-Annual		03/15/23	(a)		03/15/28	SGD	760		(3,629	)		6			(3,635	)

MASTER  PORTFOLIO  SCHEDULE  OF  INVESTMENTS 37

Schedule of Investments  (continued) December 31, 2022 Advantage CoreAlpha Bond Master Portfolio

Centrally Cleared Interest Rate Swaps (continued)

Paid by the Master Portfolio		Received by the Master Portfolio		Effective Date			Termination Date		Notional Amount (000)		Value			Upfront Premium Paid (Received)			Unrealized Appreciation (Depreciation)
Rate	Frequency	Rate	Frequency
6-Month EURIBOR, 2.69%	Semi-Annual	3.25%	Annual		03/15/23	(a)		03/15/28	EUR	31,600	$	(26,768	)	$	96,313		$	(123,081	)
3.25%	Annual	6-Month EURIBOR, 2.69%	Semi-Annual		03/15/23	(a)		03/15/28	EUR	31,600		26,768			(123,307	)		150,075
3.26%	Semi-Annual	3-Month Canada Bank Acceptance, 4.94%	Semi-Annual		03/15/23	(a)		03/15/28	CAD	1,600		21,927			225			21,702
3.29%	Annual	3-Month STIBOR, 2.70%	Quarterly		03/15/23	(a)		03/15/28	SEK	7,170		200			7			193
1-Day SOFR, 4.32%	Annual	3.37%	Annual		03/15/23	(a)		03/15/28	USD	540		(7,941	)		94			(8,035	)
3.37%	Annual	1-Day SOFR, 4.32%	Annual		03/15/23	(a)		03/15/28	USD	70,300		1,016,843			6,355			1,010,488
3.38%	Annual	3-Month STIBOR, 2.70%	Quarterly		03/15/23	(a)		03/15/28	SEK	5,200		(1,995	)		5			(2,000	)
3.38%	Annual	6-Month NIBOR, 3.51%	Semi-Annual		03/15/23	(a)		03/15/28	NOK	4,040		(2,736	)		1,134			(3,870	)
1-Day SOFR, 4.32%	Annual	3.43%	Annual		03/15/23	(a)		03/15/28	USD	520		(6,276	)		6			(6,282	)
3.43%	Annual	6-Month NIBOR, 3.51%	Semi-Annual		03/15/23	(a)		03/15/28	NOK	2,960		(2,696	)		254			(2,950	)
3.51%	Semi-Annual	1-Day SORA, 2.53%	Semi-Annual		03/15/23	(a)		03/15/28	SGD	480		(6,693	)		4			(6,697	)
1-Day SOFR, 4.32%	Annual	3.53%	Annual		03/15/23	(a)		03/15/28	USD	590		(4,453	)		7			(4,460	)
3.53%	Semi-Annual	1-Day SORA, 2.53%	Semi-Annual		03/15/23	(a)		03/15/28	SGD	1,040		(15,359	)		8			(15,367	)
3.57%	Semi-Annual	3-Month Canada Bank Acceptance, 4.94%	Semi-Annual		03/15/23	(a)		03/15/28	CAD	760		2,461			(231	)		2,692
3.57%	Annual	6-Month NIBOR, 3.51%	Semi-Annual		03/15/23	(a)		03/15/28	NOK	2,730		(4,341	)		193			(4,534	)
3.58%	Semi-Annual	3-Month Canada Bank Acceptance, 4.94%	Semi-Annual		03/15/23	(a)		03/15/28	CAD	720		2,201			302			1,899
3.60%	Semi-Annual	3-Month Canada Bank Acceptance, 4.94%	Semi-Annual		03/15/23	(a)		03/15/28	CAD	720		1,755			(1,815	)		3,570
1-Day SOFR, 4.32%	Annual	3.65%	Annual		03/15/23	(a)		03/15/28	USD	1,520		(3,206	)		17			(3,223	)
3.69%	Quarterly	3-Month HIBOR, 4.99%	Quarterly		03/15/23	(a)		03/15/28	HKD	5,350		8,923			8			8,915
3.70%	Quarterly	3-Month HIBOR, 4.99%	Quarterly		03/15/23	(a)		03/15/28	HKD	3,150		5,163			5			5,158
3.71%	Annual	6-Month NIBOR, 3.51%	Semi-Annual		03/15/23	(a)		03/15/28	NOK	4,890		(10,993	)		254			(11,247	)
3.72%	Quarterly	3-Month HIBOR, 4.99%	Quarterly		03/15/23	(a)		03/15/28	HKD	2,627		4,002			4			3,998
1-Day SOFR, 4.32%	Annual	3.73%	Annual		03/15/23	(a)		03/15/28	USD	260		435			3			432
1-Day SONIA, 3.43%	Annual	3.75%	Annual		03/15/23	(a)		03/15/28	GBP	380		(6,673	)		5			(6,678	)
3.75%	Quarterly	3-Month HIBOR, 4.99%	Quarterly		03/15/23	(a)		03/15/28	HKD	1,353		1,827			2			1,825
3.78%	Quarterly	3-Month HIBOR, 4.99%	Quarterly		03/15/23	(a)		03/15/28	HKD	2,420		2,848			3			2,845
1-Day SOFR, 4.32%	Annual	3.79%	Annual		03/15/23	(a)		03/15/28	USD	620		2,675			7			2,668
1-Day SONIA, 3.43%	Annual	3.79%	Annual		03/15/23	(a)		03/15/28	GBP	29,270		(454,538	)		35,257			(489,795	)
3.79%	Quarterly	3-Month HIBOR, 4.99%	Quarterly		03/15/23	(a)		03/15/28	HKD	2,420		2,674			3			2,671
3.80%	Quarterly	3-Month HIBOR, 4.99%	Quarterly		03/15/23	(a)		03/15/28	HKD	4,080		4,332			6			4,326
1-Day SONIA, 3.43%	Annual	3.90%	Annual		03/15/23	(a)		03/15/28	GBP	220		(2,164	)		3			(2,167	)
6-Month BBSW, 3.77%	Semi-Annual	3.97%	Semi-Annual		03/15/23	(a)		03/15/28	AUD	1,180		(12,143	)		9			(12,152	)
6-Month BBSW, 3.77%	Semi-Annual	4.00%	Semi-Annual		03/15/23	(a)		03/15/28	AUD	460		(4,246	)		3			(4,249	)
1-Day SONIA, 3.43%	Annual	4.01%	Annual		03/15/23	(a)		03/15/28	GBP	220		(868	)		3			(871	)
1-Day SOFR, 4.32%	Annual	4.03%	Annual		03/15/23	(a)		03/15/28	USD	680		10,225			8			10,217
6-Month BBSW, 3.77%	Semi-Annual	4.20%	Semi-Annual		03/15/23	(a)		03/15/28	AUD	1,010		(3,291	)		7			(3,298	)
6-Month BBSW, 3.77%	Semi-Annual	4.24%	Semi-Annual		03/15/23	(a)		03/15/28	AUD	630		(1,327	)		5			(1,332	)
4.32%	Semi-Annual	3-Month BBR, 0.85%	Quarterly		03/15/23	(a)		03/15/28	NZD	740		11,039			5			11,034
6-Month BBSW, 3.77%	Semi-Annual	4.39%	Semi-Annual		03/15/23	(a)		03/15/28	AUD	435		1,141			3			1,138
6-Month BBSW, 3.77%	Semi-Annual	4.42%	Semi-Annual		03/15/23	(a)		03/15/28	AUD	435		1,497			3			1,494
6-Month BBSW, 3.77%	Semi-Annual	4.42%	Semi-Annual		03/15/23	(a)		03/15/28	AUD	281		984			2			982
4.43%	Semi-Annual	3-Month BBR, 0.85%	Quarterly		03/15/23	(a)		03/15/28	NZD	830		9,857			6			9,851
6-Month BBSW, 3.77%	Semi-Annual	4.43%	Semi-Annual		03/15/23	(a)		03/15/28	AUD	267		1,010			2			1,008
6-Month BBSW, 3.77%	Semi-Annual	4.44%	Semi-Annual		03/15/23	(a)		03/15/28	AUD	281		1,133			2			1,131
1-Day SONIA, 3.43%	Annual	4.50%	Annual		03/15/23	(a)		03/15/28	GBP	900		20,027			11			20,016
6-Month BBSW, 3.77%	Semi-Annual	4.50%	Semi-Annual		03/15/23	(a)		03/15/28	AUD	331		1,909			2			1,907
6-Month PRIBOR, 2.13%	Semi-Annual	4.71%	Annual		03/15/23	(a)		03/15/28	CZK	5,690		(4,357	)		3			(4,360	)
6-Month PRIBOR, 2.13%	Semi-Annual	4.91%	Annual		03/15/23	(a)		03/15/28	CZK	6,600		(2,487	)		3			(2,490	)
5.34%	Annual	6-Month WIBOR, 7.14%	Semi-Annual		03/15/23	(a)		03/15/28	PLN	2,020		14,076			5			14,071
6-Month PRIBOR, 2.13%	Semi-Annual	5.68%	Annual		03/15/23	(a)		03/15/28	CZK	8,630		9,590			4			9,586
5.94%	Annual	6-Month WIBOR, 7.14%	Semi-Annual		03/15/23	(a)		03/15/28	PLN	1,480		2,252			4			2,248
6.03%	Annual	6-Month WIBOR, 7.14%	Semi-Annual		03/15/23	(a)		03/15/28	PLN	1,840		1,199			5			1,194
6.21%	Annual	6-Month WIBOR, 7.14%	Semi-Annual		03/15/23	(a)		03/15/28	PLN	3,140		(3,128	)		8			(3,136	)
7.54%	Annual	6-Month WIBOR, 7.14%	Semi-Annual		03/15/23	(a)		03/15/28	PLN	1,600		(21,002	)		4			(21,006	)
7.63%	Annual	6-Month WIBOR, 7.14%	Semi-Annual		03/15/23	(a)		03/15/28	PLN	2,380		(33,312	)		5			(33,317	)
3-Month JIBAR, 7.26%	Quarterly	8.21%	Quarterly		03/15/23	(a)		03/15/28	ZAR	7,670		(3,069	)		5			(3,074	)
3-Month JIBAR, 7.26%	Quarterly	8.65%	Quarterly		03/15/23	(a)		03/15/28	ZAR	11,260		7,338			7			7,331

38 2 0 2 2   BLACK ROCK  ANNUAL  REPORT  TO   SHAREHOLDERS

Schedule of Investments  (continued) December 31, 2022 Advantage CoreAlpha Bond Master Portfolio

Centrally Cleared Interest Rate Swaps (continued)

Paid by the Master Portfolio		Received by the Master Portfolio		Effective Date			Termination Date		Notional Amount (000)		Value			Upfront Premium Paid (Received)			Unrealized Appreciation (Depreciation)
Rate	Frequency	Rate	Frequency
3-Month JIBAR, 7.26%	Quarterly	8.74%	Quarterly		03/15/23	(a)		03/15/28	ZAR	13,200	$	11,260		$	8		$	11,252
1-Day SOFR, 4.32%	Annual	0.54%	Annual		N/A			10/20/30	USD	1,250		(266,007	)		—			(266,007	)
0.55%	Annual	1-Day FEDL, 4.33%	Annual		N/A			10/20/30	USD	1,250		264,115			—			264,115
6-Month EURIBOR, 2.69%	Semi-Annual	2.73%	Annual		03/15/23	(a)		03/15/33	EUR	50,220		(2,212,976	)		(528,010	)		(1,684,966	)
1-Day SOFR, 4.32%	Annual	3.16%	Annual		03/15/23	(a)		03/15/33	USD	57,160		(1,758,637	)		51,432			(1,810,069	)
3.19%	Annual	6-Month EURIBOR, 2.69%	Semi-Annual		03/15/23	(a)		03/15/33	EUR	16,910		44,474			(95,930	)		140,404
3.32%	Annual	1-Day SONIA, 3.43%	Annual		03/15/23	(a)		03/15/33	GBP	15,630		646,485			51,903			594,582
0.74%	Annual	1-Day SOFR, 4.32%	Annual		N/A			10/20/35	USD	500		146,186			—			146,186
1-Day FEDL, 4.33%	Annual	0.78%	Annual		N/A			10/20/35	USD	500		(143,542	)		—			(143,542	)
0.84%	Annual	1-Day SOFR, 4.32%	Annual		N/A			10/20/40	USD	1,000		354,531			—			354,531
1-Day FEDL, 4.33%	Annual	0.90%	Annual		N/A			10/20/40	USD	1,000		(345,821	)		—			(345,821	)
0.90%	Annual	1-Day SOFR, 4.32%	Annual		N/A			10/20/50	USD	500		213,566			—			213,566
1-Day FEDL, 4.33%	Annual	0.98%	Annual		N/A			10/20/50	USD	500		(205,436	)		—			(205,436	)
2.02%	Annual	6-Month EURIBOR, 2.69%	Semi-Annual		03/15/23	(a)		03/15/53	EUR	19,560		2,113,330			460,934			1,652,396
2.84%	Annual	1-Day SOFR, 4.32%	Annual		03/15/23	(a)		03/15/53	USD	8,270		543,423			5,646			537,777
											$	(268,646	)	$	(84,711	)	$	(183,935	)

^(a) Forward Swap.

Balances Reported in the Statement of Assets and Liabilities for Centrally Cleared Swaps

Description	Swap Premiums Paid		Swap Premiums Received			Unrealized Appreciation		Unrealized Depreciation
Centrally Cleared Swaps(a)	$	3,244,767	$	(1,307,356	)	$	6,806,848	$	(10,172,976	)

^(a) Includes cumulative appreciation (depreciation) on centrally cleared swaps, as reported in the Master Portfolio Schedule of Investments. Only current day’s variation margin is reported within the Statement of Assets and Liabilities and is net of any previously paid (received) swap premium amounts.

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)	$	—	$	—	$	—	$	—	$	4,058,109	$	—	$	4,058,109
Forward foreign currency exchange contracts
Unrealized appreciation on forward foreign currency exchange contracts		—		—		—		28,493		—		—		28,493
Swaps — centrally cleared
Unrealized appreciation on centrally cleared swaps(a)		—		—		—		—		6,473,624		333,224		6,806,848
	$	—	$	—	$	—	$	28,493	$	10,531,733	$	333,224	$	10,893,450
Liabilities — Derivative Financial Instruments
Futures contracts
Unrealized depreciation on futures contracts(a)	$	—	$	—	$	—	$	—	$	5,175,068	$	—	$	5,175,068
Forward foreign currency exchange contracts
Unrealized depreciation on forward foreign currency exchange contracts		—		—		—		1,774		—		��		1,774
Swaps — centrally cleared
Unrealized depreciation on centrally cleared swaps(a)		—		3,515,417		—		—		6,657,559		—		10,172,976
	$	—	$	3,515,417	$	—	$	1,774	$	11,832,627	$	—	$	15,349,818

^(a)  Net cumulative unrealized appreciation (depreciation) on futures contracts and centrally cleared swaps, if any, are reported in the Master Portfolio 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).

MASTER  PORTFOLIO  SCHEDULE  OF  INVESTMENTS 39

Schedule of Investments  (continued) December 31, 2022 Advantage CoreAlpha Bond Master Portfolio

For the period ended December 31, 2022, 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	$	—	$	—		$	—	$	—	$	(54,779,920	)	$	—		$	(54,779,920	)
Forward foreign currency exchange contracts		—		—			—		255,754		—			—			255,754
Swaps		—		(2,115,633	)		—		—		2,183,731			(323,821	)		(255,723	)
	$	—	$	(2,115,633	)	$	—	$	255,754	$	(52,596,189	)	$	(323,821	)	$	(54,779,889	)
Net Change in Unrealized Appreciation (Depreciation) on:
Futures contracts	$	—	$	—		$	—	$	—	$	1,564,308		$	—		$	1,564,308
Forward foreign currency exchange contracts		—		—			—		65,639		—			—			65,639
Swaps		—		(2,603,200	)		—		—		(934,957	)		333,224			(3,204,933	)
	$	—	$	(2,603,200	)	$	—	$	65,639	$	629,351		$	333,224		$	(1,574,986	)

Average Quarterly Balances of Outstanding Derivative Financial Instruments

Futures contracts:
Average notional value of contracts — long	$	367,298,082
Average notional value of contracts — short	$	107,141,992
Forward foreign currency exchange contracts:
Average amounts purchased — in USD	$	9,115,437
Average amounts sold — in USD	$	6,180,809
Credit default swaps:
Average notional value — buy protection	$	148,032,679
Interest rate swaps:
Average notional value — pays fixed rate	$	621,927,082
Average notional value — receives fixed rate	$	605,008,147
Inflation swaps:
Average notional value — pays fixed rate	$	7,803,490

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

Derivative Financial Instruments — Offsetting as of Period End

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

	Assets			Liabilities
Derivative Financial Instruments
Futures contracts	$	3,497,612		$	4,764,755
Forward foreign currency exchange contracts		28,493			1,774
Swaps — centrally cleared		1,465,400			—
Total derivative assets and liabilities in the Statement of Assets and Liabilities		4,991,505			4,766,529
Derivatives not subject to a Master Netting Agreement or similar agreement (“MNA”)		(4,963,012	)		(4,764,755	)
Total derivative assets and liabilities subject to an MNA	$	28,493		$	1,774

The following table presents the Master Portfolio’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 Master Portfolio:

Counterparty		Derivative Assets Subject to an MNA by Counterparty		Derivatives Available for Offset	(a)		Non-Cash Collateral Received		Cash Collateral Received		Net Amount of Derivative Assets	(b)
Deutsche Bank AG	$	27,962	$	—		$	—	$	—	$	27,962
HSBC Bank PLC		16		(16	)		—		—		—
Royal Bank of Canada		515		(515	)		—		—		—
	$	28,493	$	(531	)	$	—	$	—	$	27,962

40 2 0 2 2   BLACK ROCK  ANNUAL  REPORT  TO   SHAREHOLDERS

Schedule of Investments  (continued) December 31, 2022 Advantage CoreAlpha Bond Master Portfolio

Counterparty		Derivative Liabilities Subject to an MNA by Counterparty		Derivatives Available for Offset	(a)		Non-Cash Collateral Pledged		Cash Collateral Pledged		Net Amount of Derivative Liabilities	(c)
HSBC Bank PLC	$	347	$	(16	)	$	—	$	—	$	331
Royal Bank of Canada		1,427		(515	)		—		—		912
	$	1,774	$	(531	)	$	—	$	—	$	1,243

^(a)  The amount of derivatives available for offset is limited to the amount of derivative asset and/or liabilities that are subject to an MNA.

^(b)  Net amount represents the net amount receivable from the counterparty in the event of default.

^(c)  Net amount represents the net amount payable due to counterparty in the event of default.

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 Master Portfolio’s policy regarding valuation of financial instruments, refer to the Notes to Financial Statements.

The following table summarizes the Master Portfolio’s financial instruments categorized in the fair value hierarchy. The breakdown of the Master Portfolio’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
Asset-Backed Securities	$	—		$	105,896,839		$	—	$	105,896,839
Common Stocks		—			—			1		1
Corporate Bonds		—			362,241,762			—		362,241,762
Foreign Agency Obligations		—			4,451,332			—		4,451,332
Municipal Bonds		—			6,586,702			—		6,586,702
Non-Agency Mortgage-Backed Securities		—			83,447,046			10,823		83,457,869
U.S. Government Sponsored Agency Securities		—			327,232,173			—		327,232,173
Short-Term Securities
Money Market Funds		183,097,233			—			—		183,097,233
U.S. Government Sponsored Agency Securities		—			259,831			—		259,831
U.S. Treasury Obligations		—			147,715,572			—		147,715,572
Liabilities
Investments
TBA Sale Commitments		—			(19,347,647	)		—		(19,347,647	)
	$	183,097,233		$	1,018,483,610		$	10,824	$	1,201,591,667
Derivative Financial Instruments(a)
Assets
Foreign Currency Exchange Contracts	$	—		$	28,493		$	—	$	28,493
Interest Rate Contracts		4,058,109			6,473,624			—		10,531,733
Other Contracts		—			333,224			—		333,224
Liabilities
Credit Contracts		—			(3,515,417	)		—		(3,515,417	)
Foreign Currency Exchange Contracts		—			(1,774	)		—		(1,774	)
Interest Rate Contracts		(5,175,068	)		(6,657,559	)		—		(11,832,627	)
	$	(1,116,959	)	$	(3,339,409	)	$	—	$	(4,456,368	)

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

See notes to financial statements.

MASTER  PORTFOLIO  SCHEDULE  OF  INVESTMENTS 41

Statement of Assets and Liabilities

December 31, 2022

	Advantage CoreAlpha Bond Master Portfolio
ASSETS
Investments, at value — unaffiliated(a)(b)	$	1,037,842,081
Investments, at value — affiliated(c)		183,097,233
Cash pledged:
Futures contracts		11,319,000
Centrally cleared swaps		8,078,000
Foreign currency, at value(d)		3,862,457
Receivables:
Investments sold		17,733
Securities lending income — affiliated		26,455
TBA sale commitments		19,842,405
Contributions from investors		834,009
Dividends — unaffiliated		277,616
Dividends — affiliated		332
Interest — unaffiliated		4,890,423
Principal paydowns		3,585
Variation margin on futures contracts		3,497,612
Variation margin on centrally cleared swaps		1,465,400
Unrealized appreciation on forward foreign currency exchange contracts		28,493
Total assets		1,275,082,834
LIABILITIES
Bank overdraft		147,444
Cash received as collateral for TBA commitments		16,000
Collateral on securities loaned		150,125,244
TBA sale commitments, at value(e)		19,347,647
Payables:
Investments purchased		61,059,309
Investment advisory fees		206,018
Trustees’ fees		1,559
Professional fees		47,224
Variation margin on futures contracts		4,764,755
Unrealized depreciation on forward foreign currency exchange contracts		1,774
Total liabilities		235,716,974
NET ASSETS	$	1,039,365,860
NET ASSETS CONSIST OF
Investors’ capital	$	1,134,691,541
Net unrealized appreciation (depreciation)		(95,325,681	)
NET ASSETS	$	1,039,365,860
(a) Investments, at cost — unaffiliated	$	1,129,223,402
(b) Securities loaned, at value	$	146,826,316
(c)  Investments, at cost — affiliated	$	183,060,975
(d) Foreign currency, at cost	$	3,881,465
(e) Proceeds from TBA sale commitments	$	19,842,405

See notes to financial statements.

42 2 0 2 2   BLACK ROCK  ANNUAL  REPORT  TO   SHAREHOLDERS

Statement of Operations

Year Ended December 31, 2022

	Advantage CoreAlpha Bond Master Portfolio
INVESTMENT INCOME
Dividends — affiliated	$	1,623,017
Interest — unaffiliated		32,555,071
Securities lending income — affiliated — net		149,396
Total investment income		34,327,484
EXPENSES
Investment advisory		2,923,198
Professional		48,413
Trustees		15,462
Total expenses		2,987,073
Less:
Fees waived and/or reimbursed by the Manager		(111,123	)
Total expenses after fees waived and/or reimbursed		2,875,950
Net investment income		31,451,534
REALIZED AND UNREALIZED GAIN (LOSS)
Net realized gain (loss) from:
Investments — unaffiliated		(67,651,559	)
Investments — affiliated		6,281
Forward foreign currency exchange contracts		255,754
Foreign currency transactions		(855,758	)
Futures contracts		(54,779,920	)
Swaps		(255,723	)
		(123,280,925	)
Net change in unrealized appreciation (depreciation) on:
Investments — unaffiliated		(111,358,545	)
Investments — affiliated		24,304
Forward foreign currency exchange contracts		65,639
Foreign currency translations		(9,258	)
Futures contracts		1,564,308
Swaps		(3,204,933	)
		(112,918,485	)
Net realized and unrealized loss		(236,199,410	)
NET DECREASE IN NET ASSETS RESULTING FROM OPERATIONS	$	(204,747,876	)

See notes to financial statements.

MASTER  PORTFOLIO  FINANCIAL  STATEMENTS 43

Statements of Changes in Net Assets

	Advantage CoreAlpha Bond Master Portfolio
	Year Ended 12/31/22			Year Ended 12/31/21
INCREASE (DECREASE) IN NET ASSETS
OPERATIONS
Net investment income	$	31,451,534		$	33,225,831
Net realized loss		(123,280,925	)		(6,058,908	)
Net change in unrealized appreciation (depreciation)		(112,918,485	)		(61,790,637	)
Net decrease in net assets resulting from operations		(204,747,876	)		(34,623,714	)
CAPITAL TRANSACTIONS
Proceeds from contributions		166,938,000			313,820,856
Value of withdrawals		(411,776,649	)		(595,612,774	)
Net decrease in net assets derived from capital transactions		(244,838,649	)		(281,791,918	)
NET ASSETS
Total decrease in net assets		(449,586,525	)		(316,415,632	)
Beginning of year		1,488,952,385			1,805,368,017
End of year	$	1,039,365,860		$	1,488,952,385

See notes to financial statements.

44 2 0 2 2   BLACK ROCK  ANNUAL  REPORT  TO   SHAREHOLDERS

Financial Highlights

	Advantage CoreAlpha Bond Master Portfolio
	Year Ended 12/31/22			Year Ended 12/31/21			Year Ended 12/31/20			Year Ended 12/31/19			Year Ended 12/31/18
Total Return
Total return		(14.21	)%		(1.88	)%		8.93	%		9.74	%		(0.11	)%
Ratios to Average Net Assets(a)
Total expenses		0.24	%		0.24	%		0.24	%		0.24	%		0.27	%(b)
Total expenses after fees waived and/or reimbursed		0.23	%		0.23	%		0.23	%		0.23	%		0.24	%
Net investment income		2.56	%		2.05	%		2.48	%		3.05	%		3.11	%
Supplemental Data
Net assets, end of year (000)	$	1,039,366		$	1,488,952		$	1,805,368		$	1,938,121		$	1,485,689
Portfolio turnover rate(c)		205	%		219	%		410	%		263	%		331	%
(a) Excludes fees and expenses incurred indirectly as a result of investments in underlying funds. (b) Includes board realignment and consolidation costs. Without these costs, total expenses would have been 0.25%. (c)  Includes mortgage dollar roll transactions (“MDRs”). Additional information regarding portfolio turnover rate is as follows:
	Year Ended 12/31/22			Year Ended 12/31/21			Year Ended 12/31/20			Year Ended 12/31/19			Year Ended 12/31/18
Portfolio turnover rate (excluding MDRs)		107	%		123	%		261	%		166	%		189	%

See notes to financial statements.    

MASTER  PORTFOLIO  FINANCIAL  HIGHLIGHTS 45

Notes to Financial Statements

1. ORGANIZATION

Master Investment Portfolio II (“MIP II”) is registered under the Investment Company Act of 1940, as amended (the “1940 Act”), as an open-end management investment company. MIP II is organized as a Delaware statutory trust. Advantage CoreAlpha Bond Master Portfolio (the “Master Portfolio”) is a series of MIP II. The Master Portfolio is classified as diversified.

The Master Portfolio, together with certain other registered investment companies advised by BlackRock Advisors, LLC (“BAL” or the “Manager”) or its affiliates, is included in a complex of funds referred to as the BlackRock Fixed-Income 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 Master Portfolio 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 (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. 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, is recognized daily on an accrual basis.

Foreign Currency Translation: The Master Portfolio’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.

The Master Portfolio does not isolate the portion of the results of operations arising as a result of changes in the exchange rates from the changes in the market prices of investments held or sold for financial reporting purposes. Accordingly, the effects of changes in exchange rates on investments are not segregated in the Statement 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. Realized currency gains (losses) on foreign currency related transactions are reported 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. The Master Portfolio has elected to treat realized gains (losses) from certain forward foreign currency exchange contracts as capital gain (loss) for U.S. federal income tax purposes.

Collateralization: If required by an exchange or counterparty agreement, the Master Portfolio may be required to deliver/deposit cash and/or securities to/with an exchange, or broker-dealer or custodian as collateral for certain investments.

Deferred Compensation Plan: Under the Deferred Compensation Plan (the “Plan”) approved by the Board of Trustees of MIP II (the “Board”), the trustees who are not “interested persons” of the Master Portfolio, as defined in the 1940 Act (“Independent Trustees”), may defer a portion of their annual complex-wide compensation. Deferred amounts earn an approximate return as though equivalent dollar amounts had been invested in common shares of certain funds in the BlackRock Fixed-Income Complex selected by the Independent Trustees. This has the same economic effect for the Independent Trustees as if the Independent Trustees had invested the deferred amounts directly in certain funds in the BlackRock Fixed-Income Complex.

The Plan is not funded and obligations thereunder represent general unsecured claims against the general assets of the Master Portfolio, as applicable. Deferred compensation liabilities, if any, are included in the Trustees’ and Officer’s fees payable in the Statement of Assets and Liabilities and will remain as a liability of the Master Portfolio until such amounts are distributed in accordance with the Plan.

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

Other: Expenses directly related to the Master Portfolio are charged to the Master Portfolio. 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 Master Portfolio’s investments are valued at fair value (also referred to as “market value” within the financial statements) each day that the Master Portfolio 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 Board has approved the designation of the Master Portfolio’s Manager as the valuation designee for the Master Portfolio. The Master Portfolio determines the fair values of its financial instruments using various independent

46 2 0 2 2   BLACK ROCK  ANNUAL  REPORT  TO   SHAREHOLDERS

Notes to Financial Statements  (continued)

dealers or pricing services under the Manager’s policies. 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 the Manager’s policies and procedures as reflecting fair value. The Manager has formed a committee (the “Valuation Committee”) to develop pricing policies and procedures and to oversee the pricing function for all financial instruments, with assistance from other BlackRock pricing committees.

Fair Value Inputs and Methodologies: The following methods and inputs are used to establish the fair value of the Master Portfolio’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. 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”).

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

• Forward foreign currency exchange contracts are valued at the mean between the bid and ask prices and are determined as of the close of trading on the NYSE based on that day’s prevailing forward exchange rate for the underlying currencies.

• 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 NYSE. Each business day, the Master Portfolio 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 Valuation Committee in accordance with the Manager’s policies and procedures as reflecting fair value (“Fair Valued Investments”). The fair valuation approaches that may be used by the 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 Valuation Committee seeks to determine the price that the Master Portfolio 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 Valuation Committee deems relevant and consistent with the principles of fair value measurement.

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 Valuation Committee and third-party pricing services utilized by the Valuation Committee include one or a combination of, but not limited to, the following inputs.

	Standard Inputs Generally Considered By The Valuation Committee And 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

MASTER  PORTFOLIO  NOTES  TO  FINANCIAL  STATEMENTS 47

Notes to Financial Statements  (continued)

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 Master Portfolio. Typically, the most recently available information by a Private Company is as of a date that is earlier than the date the Master Portfolio is calculating its NAV. This factor may result in a difference between the value of the investment and the price the Master Portfolio 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 Master Portfolio 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 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 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

Asset-Backed and Mortgage-Backed Securities: Asset-backed securities are generally issued as pass-through certificates or as debt instruments. Asset-backed securities issued as pass-through certificates represent undivided fractional ownership interests in an underlying pool of assets. Asset-backed securities issued as debt instruments, which are also known as collateralized obligations, are typically issued as the debt of a special purpose entity organized solely for the purpose of owning such assets and issuing such debt. Asset-backed securities are often backed by a pool of assets representing the obligations of a number of different parties. The yield characteristics of certain asset-backed securities may differ from traditional debt securities. One such major difference is that all or a principal part of the obligations may be prepaid at any time because the underlying assets (i.e., loans) may be prepaid at any time. As a result, a decrease in interest rates in the market may result in increases in the level of prepayments as borrowers, particularly mortgagors, refinance and repay their loans. An increased prepayment rate with respect to an asset-backed security will have the effect of shortening the maturity of the security. In addition, a fund may subsequently have to reinvest the proceeds at lower interest rates. If a fund has purchased such an asset-backed security at a premium, a faster than anticipated prepayment rate could result in a loss of principal to the extent of the premium paid.

For mortgage pass-through securities (the “Mortgage Assets”) there are a number of important differences among the agencies and instrumentalities of the U.S. Government that issue mortgage-related securities and among the securities that they issue. For example, mortgage-related securities guaranteed by Ginnie Mae are guaranteed as to the timely payment of principal and interest by Ginnie Mae and such guarantee is backed by the full faith and credit of the United States. However, mortgage-related securities issued by Freddie Mac and Fannie Mae, including Freddie Mac and Fannie Mae guaranteed mortgage pass-through certificates, which are solely the obligations of Freddie Mac and Fannie Mae, are not backed by or entitled to the full faith and credit of the United States, but are supported by the right of the issuer to borrow from the U.S. Treasury.

Non-agency mortgage-backed securities are securities issued by non-governmental issuers and have no direct or indirect government guarantees of payment and are subject to various risks. Non-agency mortgage loans are obligations of the borrowers thereunder only and are not typically insured or guaranteed by any other person or entity. The ability of a borrower to repay a loan is dependent upon the income or assets of the borrower. A number of factors, including a general economic downturn, acts of God, terrorism, social unrest and civil disturbances, may impair a borrower’s ability to repay its loans.

Multiple Class Pass-Through Securities: Multiple class pass-through securities, including collateralized mortgage obligations (“CMOs”) and commercial mortgage-backed securities, may be issued by Ginnie Mae, U.S. Government agencies or instrumentalities or by trusts formed by private originators of, or investors in, mortgage loans. In general, CMOs are debt obligations of a legal entity that are collateralized by a pool of residential or commercial mortgage loans or Mortgage Assets. The payments on these are used to make payments on the CMOs or multiple pass-through securities. Multiple class pass-through securities represent direct ownership interests in the Mortgage Assets. Classes of CMOs include interest only (“IOs”), principal only (“POs”), planned amortization classes and targeted amortization classes. IOs and POs are stripped mortgage-backed securities representing interests in a pool of mortgages, the cash flow from which has been separated into interest and principal components. IOs receive the interest portion of the cash flow while POs receive the principal portion. IOs and POs can be extremely volatile in response to changes in interest rates. As interest rates rise and fall, the value of IOs tends to move in the same direction as interest rates. POs perform best when prepayments on the underlying mortgages rise since this increases the rate at which the principal is returned and the yield to maturity on the PO. When payments on mortgages underlying a PO are slower than anticipated, the life of the PO is lengthened and the yield to maturity is reduced. If the underlying Mortgage Assets experience greater than anticipated prepayments of principal, a fund’s initial investment in the IOs may not fully recoup.

48 2 0 2 2   BLACK ROCK  ANNUAL  REPORT  TO   SHAREHOLDERS

Notes to Financial Statements  (continued)

Stripped Mortgage-Backed Securities: Stripped mortgage-backed securities are typically issued by the U.S. Government, its agencies and instrumentalities. Stripped mortgage-backed securities are usually structured with two classes that receive different proportions of the interest (IOs) and principal (POs) distributions on a pool of Mortgage Assets. Stripped mortgage-backed securities may be privately issued.

Forward Commitments, When-Issued and Delayed Delivery Securities: The Master Portfolio may purchase securities on a when-issued basis and may purchase or sell securities on a forward commitment basis. Settlement of such transactions normally occurs within a month or more after the purchase or sale commitment is made. The Master Portfolio may purchase securities under such conditions with the intention of actually acquiring them but may enter into a separate agreement to sell the securities before the settlement date. Since the value of securities purchased may fluctuate prior to settlement, the Master Portfolio may be required to pay more at settlement than the security is worth. In addition, a fund is not entitled to any of the interest earned prior to settlement. When purchasing a security on a delayed delivery basis, the Master Portfolio assumes the rights and risks of ownership of the security, including the risk of price and yield fluctuations. In the event of default by the counterparty, the Master Portfolio’s maximum amount of loss is the unrealized appreciation of unsettled when-issued transactions.

TBA Commitments: TBA commitments are forward agreements for the purchase or sale of securities, including mortgage-backed securities for a fixed price, with payment and delivery on an agreed upon future settlement date. The specific securities to be delivered are not identified at the trade date. However, delivered securities must meet specified terms, including issuer, rate and mortgage terms. When entering into TBA commitments, a fund may take possession of or deliver the underlying mortgage-backed securities but can extend the settlement or roll the transaction. TBA commitments involve a risk of loss if the value of the security to be purchased or sold declines or increases, respectively, prior to settlement date, if there are expenses or delays in connection with the TBA transactions, or if the counterparty fails to complete the transaction.

In order to better define contractual rights and to secure rights that will help a fund mitigate its counterparty risk, TBA commitments may be entered into by a fund under Master Securities Forward Transaction Agreements (each, an “MSFTA”). An MSFTA typically contains, among other things, collateral posting terms and netting provisions in the event of default and/or termination event. 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 the collateral currently pledged by a fund and the counterparty. Cash collateral that has been pledged to cover the obligations of a fund and cash collateral received from the counterparty, if any, is reported separately in the Statement of Assets and Liabilities as cash pledged as collateral for TBA commitments or cash received as collateral for TBA commitments, respectively. Non-cash collateral pledged by a fund, if any, is noted in the Schedule of Investments. Typically, a fund is permitted to sell, re-pledge or use the collateral it receives; however, the counterparty is not permitted to do so. To the extent amounts due to a fund are not fully collateralized, contractually or otherwise, a fund bears the risk of loss from counterparty non-performance.

Mortgage Dollar Roll Transactions: The Master Portfolio may sell TBA mortgage-backed securities and simultaneously contract to repurchase substantially similar (i.e., same type, coupon and maturity) securities on a specific future date at an agreed upon price. During the period between the sale and repurchase, a fund is not entitled to receive interest and principal payments on the securities sold. Mortgage dollar roll transactions are treated as purchases and sales and a fund realizes gains and losses on these transactions. Mortgage dollar rolls involve the risk that the market value of the securities that a fund is required to purchase may decline below the agreed upon repurchase price of those securities.

Securities Lending: The Master Portfolio may lend its securities to approved borrowers, such as brokers, dealers and other financial institutions. The borrower pledges and maintains with the Master Portfolio 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 Master Portfolio 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 Master Portfolio and any additional required collateral is delivered to the Master Portfolio, or excess collateral returned by the Master Portfolio, on the next business day. During the term of the loan, the Master Portfolio 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.

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. Any non-cash collateral received cannot be sold, re-invested or pledged by the Master Portfolio, except in the event of borrower default. The securities on loan, if any, are disclosed in the Master Portfolio’s Schedule of Investments. The market value of any securities on loan 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, respectively.

Securities lending transactions are entered into by the Master Portfolio 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 Master Portfolio, 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 Master Portfolio 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 Master Portfolio’s securities on loan by counterparty which are subject to offset under an MSLA:

Counterparty		Securities Loaned at Value		Cash Collateral Received	(a)		Non-Cash Collateral Received, at Fair Value	(a)		Net Amount
Barclays Bank PLC	$	1,325,987	$	(1,325,987	)	$	—		$	—
Barclays Capital, Inc.		398,492		(398,492	)		—			—

MASTER  PORTFOLIO  NOTES  TO  FINANCIAL  STATEMENTS 49

Notes to Financial Statements  (continued)

Counterparty		Securities Loaned at Value		Cash Collateral Received	(a)		Non-Cash Collateral Received, at Fair Value	(a)		Net Amount
BMO Capital Markets Corp.	$	218,132	$	(218,132	)	$	—		$	—
BNP Paribas SA.		6,974,770		(6,974,770	)		—			—
BofA Securities, Inc.		2,351,297		(2,351,297	)		—			—
Citadel Clearing LLC		165,053		(165,053	)		—			—
Citigroup Global Markets, Inc.		87,723		(87,723	)		—			—
Credit Suisse Securities (USA) LLC		143,788		(143,788	)		—			—
Deutsche Bank Securities, Inc.		924,508		(924,508	)		—			—
Goldman Sachs & Co. LLC		6,270,781		(6,270,781	)		—			—
HSBC Securities (USA), Inc.		192,186		(192,186	)		—			—
J.P. Morgan Securities LLC		121,853,317		(121,853,317	)		—			—
Jefferies LLC		459,291		(459,291	)		—			—
Morgan Stanley		1,118,901		(1,118,901	)		—			—
Nomura Securities International, Inc.		560,359		(560,359	)		—			—
RBC Capital Markets LLC		2,979,809		(2,979,809	)		—			—
Scotia Capital (USA), Inc.		191,873		(191,873	)		—			—
Wells Fargo Securities LLC		610,049		(610,049	)		—			—
	$	146,826,316	$	(146,826,316	)	$	—		$	—

^(a)  Collateral received, if any, in excess of the market value of securities on loan is not presented in this table. The total cash collateral received by the Master Portfolio is disclosed in the Master Portfolio’s Statement 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 Master Portfolio 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 Master Portfolio 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 Master Portfolio.

5. DERIVATIVE FINANCIAL INSTRUMENTS

The Master Portfolio engages in various portfolio investment strategies using derivative contracts both to increase the returns of the Master Portfolio 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 Master Portfolio 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 Master Portfolio 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 Master Portfolio 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.

Forward Foreign Currency Exchange Contracts: Forward foreign currency exchange contracts are entered into to gain or reduce exposure to foreign currencies (foreign currency exchange rate risk).

A forward foreign currency exchange contract is an agreement between two parties to buy and sell a currency at a set exchange rate on a specified date. These contracts help to manage the overall exposure to the currencies in which some of the investments held by the Master Portfolio are denominated and in some cases, may be used to obtain exposure to a particular market. The contracts are traded OTC and not on an organized exchange.

The contract is marked-to-market daily and the change in market value is recorded as unrealized appreciation (depreciation) in the Statement of Assets and Liabilities. When a contract is closed, a realized gain or loss is recorded in the Statement of Operations equal to the difference between the value at the time it was opened and the value at the time it was closed. Non-deliverable forward foreign currency exchange contracts are settled with the counterparty in cash without the delivery of foreign currency. The use of forward foreign currency exchange contracts involves the risk that the value of a forward foreign currency exchange contract changes unfavorably due to movements in the value of the referenced foreign currencies, and such value may exceed the amount reflected in the Statement of Assets and Liabilities. Cash amounts pledged for forward

50 2 0 2 2   BLACK ROCK  ANNUAL  REPORT  TO   SHAREHOLDERS

Notes to Financial Statements  (continued)

foreign currency exchange contracts are considered restricted and are included in cash pledged as collateral for OTC derivatives in the Statement of Assets and Liabilities. A Master Portfolio’s risk of loss from counterparty credit risk on OTC derivatives is generally limited to the aggregate unrealized gain netted against any collateral held by the Master Portfolio.

Swaps: Swap contracts are entered into to manage exposure to issuers, markets and securities. Such contracts are agreements between the Master Portfolio 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 Master Portfolio’s 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 Master Portfolio’s counterparty on the swap. The Master Portfolio is required to interface with the CCP through the broker. Upon entering into a centrally cleared swap, the Master Portfolio 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 Master Portfolio 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.

• Credit default swaps — Credit default swaps are entered into to manage exposure to the market or certain sectors of the market, to reduce risk exposure to defaults of corporate and/or sovereign issuers or to create exposure to corporate and/or sovereign issuers to which a fund is not otherwise exposed (credit risk).

The Master Portfolio may either buy or sell (write) credit default swaps on single-name issuers (corporate or sovereign), a combination or basket of single-name issuers or traded indexes. Credit default swaps are agreements in which the protection buyer pays fixed periodic payments to the seller in consideration for a promise from the protection seller to make a specific payment should a negative credit event take place with respect to the referenced entity (e.g., bankruptcy, failure to pay, obligation acceleration, repudiation, moratorium or restructuring). As a buyer, if an underlying credit event occurs, the Master Portfolio will either (i) receive from the seller an amount equal to the notional amount of the swap and deliver the referenced security or underlying securities comprising the index, or (ii) receive a net settlement of cash equal to the notional amount of the swap less the recovery value of the security or underlying securities comprising the index. As a seller (writer), if an underlying credit event occurs, the Master Portfolio will either pay the buyer an amount equal to the notional amount of the swap and take delivery of the referenced security or underlying securities comprising the index or pay a net settlement of cash equal to the notional amount of the swap less the recovery value of the security or underlying securities comprising the index.

• Interest rate swaps — Interest rate swaps are entered into to gain or reduce exposure to interest rates or to manage duration, the yield curve or interest rate (interest rate risk).

Interest rate swaps are agreements in which one party pays a stream of interest payments, either fixed or floating, in exchange for another party’s stream of interest payments, either fixed or floating, on the same notional amount for a specified period of time. In more complex interest rate swaps, the notional principal amount may decline (or amortize) over time.

• Forward swaps — The Master Portfolio may enter into forward interest rate swaps and forward total return swaps. In a forward swap, the Master Portfolio and the counterparty agree to make periodic net payments beginning on a specified date or a net payment at termination.

• Inflation swaps — Inflation swaps are entered into to gain or reduce exposure to inflation (inflation risk). In an inflation swap, one party makes fixed interest payments on a notional principal amount in exchange for another party’s variable payments based on an inflation index, such as the Consumer Price Index.

Swap transactions involve, to varying degrees, elements of interest rate, credit and market risks 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 Master Portfolio 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 Master Portfolio 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 Master Portfolio 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.

MASTER  PORTFOLIO  NOTES  TO  FINANCIAL  STATEMENTS 51

Notes to Financial Statements  (continued)

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 Master Portfolio and the counterparty.

Cash collateral that has been pledged to cover obligations of the Master Portfolio 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 Master Portfolio, 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 Master Portfolio. Any additional required collateral is delivered to/pledged by the Master Portfolio 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 Master Portfolio 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 Master Portfolio from the counterparties are not fully collateralized, the Master Portfolio bears the risk of loss from counterparty non-performance. Likewise, to the extent the Master Portfolio has delivered collateral to a counterparty and stands ready to perform under the terms of its agreement with such counterparty, the Master Portfolio 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 Master Portfolio 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: MIP II, on behalf of the Master Portfolio, entered into an Investment Advisory Agreement with the Manager, the Master Portfolio’s investment adviser and an indirect, wholly-owned subsidiary of BlackRock, to provide investment advisory services. The Manager is responsible for the management of the Master Portfolio’s portfolio and provides the personnel, facilities, equipment and certain other services necessary to the operations of the Master Portfolio.

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

Average Daily Net Assets	Investment Advisory Fees
First $1 billion		0.24	%
$1 billion — $3 billion		0.23
$3 billion — $5 billion		0.22
$5 billion — $10 billion		0.21
Greater than $10 billion		0.20

With respect to the Master Portfolio, the Manager entered into a sub-advisory agreement with each of BlackRock International Limited (“BIL”) and BlackRock Fund Advisors (“BFA”) (collectively, the “Sub-Advisers”), each an affiliate of the Manager. The Manager pays BIL and BFA for services they provide for that portion of the Master Portfolio for which BIL and BFA, as applicable, acts as sub-adviser, a monthly fee that is equal to a percentage of the investment advisory fees paid by the Master Portfolio to the Manager.

Expense Waivers and Reimbursements: The fees and expenses of the MIP II’s Independent Trustees, counsel to the Independent Trustees and the Master Portfolio’s independent registered public accounting firm (together, the “independent expenses”) are paid directly by the Master Portfolio. The Manager has contractually agreed to reimburse the Master Portfolio or provide an offsetting credit against the investment advisory fees paid by the Master Portfolio in an amount equal to these independent expenses through June 30, 2023. The amount waived is included in fees waived and/or reimbursed by the Manager in the Statement of Operations. For the year ended December 31, 2022, the amount waived was $63,875.

With respect to the Master Portfolio, the Manager contractually agreed to waive its investment advisory fees by the amount of investment advisory fees the Master Portfolio 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 Independent Trustees, or by a vote of a majority of the outstanding voting securities of the Master Portfolio. This amount is included in fees waived and/or reimbursed by the Manager in the Statement of Operations. For the year ended December 31, 2022, the amount waived was $47,248.

The Manager has contractually agreed to waive its investment advisory fee with respect to any portion of the Master Portfolio’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. 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 the Master Portfolio. For the year ended December 31, 2022, there were no fees waived by the Manager pursuant to this arrangement.

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 Master Portfolio, subject to applicable conditions. As securities lending agent, BTC bears all operational costs directly related to securities lending, including any custodial costs. The Master Portfolio 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 Master Portfolio 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.

52 2 0 2 2   BLACK ROCK  ANNUAL  REPORT  TO   SHAREHOLDERS

Notes to Financial Statements  (continued)

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 Master Portfolio 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 Master Portfolio 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 Fixed-Income Complex in a calendar year exceeds a specified threshold, the Master Portfolio, 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 the Master Portfolio is shown as securities lending income — affiliated — net in the Statement of Operations. For the year ended December 31, 2022, the Master Portfolio paid BTC $48,644 for securities lending agent services.

Interfund Lending: In accordance with an exemptive order (the “Order”) from the SEC, the Master Portfolio 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 Master Portfolio’s investment policies and restrictions. The Master Portfolio 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, 2022, the Master Portfolio did not participate in the Interfund Lending Program.

Trustees and Officers: Certain trustees and/or officers of MIP II are directors and/or officers of BlackRock or its affiliates.

Other Transactions: The Master Portfolio 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 trustees. For the year ended December 31, 2022, 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:

Master Portfolio Name	Purchases		Sales		Net Realized Gain (Loss)
Advantage CoreAlpha Bond Master Portfolio	$	—	$	145,990	$	(86,276)

7. PURCHASES AND SALES

For the year ended December 31, 2022, purchases and sales of investments, including paydowns/payups and mortgage dollar rolls, excluding short-term securities, were as follows:

Master Portfolio Name	Purchases		Sales
Advantage CoreAlpha Bond Master Portfolio	$	2,469,797,939	$	2,999,665,016

For the year ended December 31, 2022, purchases and sales related to mortgage dollar rolls were $1,186,289,086 and $1,187,679,449, respectively.

8. INCOME TAX INFORMATION

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

The Master Portfolio 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 Master Portfolio’s U.S. federal tax returns generally remains open for a period of three years after they are filed. The statutes of limitations on the Master Portfolio’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 Master Portfolio as of December 31, 2022, 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 Master Portfolio’s financial statements.

MASTER  PORTFOLIO  NOTES  TO  FINANCIAL  STATEMENTS 53

Notes to Financial Statements  (continued)

As of December 31, 2022, 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:

Master Portfolio Name	Tax Cost		Gross Unrealized Appreciation		Gross Unrealized Depreciation		Net Unrealized Appreciation (Depreciation)
Advantage CoreAlpha Bond Master Portfolio	$	1,312,415,489	$	13,048,568	$	(107,660,328)	$	(94,611,760)

9. BANK BORROWINGS

MIP II, on behalf of the Master Portfolio, along with certain other funds managed by the Manager and its affiliates (“Participating Funds”), are a party to a 364-day, $2.50 billion credit agreement with a group of lenders. Under this agreement, the Master Portfolio may borrow to fund shareholder redemptions. Excluding commitments designated for certain individual funds, the Participating Funds, including the Master Portfolio, 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) Overnight Bank Funding Rate (“OBFR”) (but, in any event, not less than 0.00%) on the date the loan is made plus 0.80% per annum, (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 or (c) the sum of (x) Daily Simple Secured Overnight Financing Rate (“SOFR”) (but, in any event, not less than 0.00%) on the date the loan is made plus 0.10% and (y) 0.80% per annum. The agreement expires in April 2023 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, 2022, the Master Portfolio did not borrow under the credit agreement.

10. PRINCIPAL RISKS

In the normal course of business, the Master Portfolio invests in securities or other instruments and may enter into certain transactions, and such activities subject the Master Portfolio 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 Master Portfolio and its investments. The Master Portfolio’s prospectus provides details of the risks to which the Master Portfolio is subject.

The Master Portfolio 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: The Master Portfolio 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 the Master Portfolio to reinvest in lower yielding securities. The Master Portfolio may also be exposed to reinvestment risk, which is the risk that income from the Master Portfolio’s portfolio will decline if the Master Portfolio invests the proceeds from matured, traded or called fixed-income securities at market interest rates that are below the Master Portfolio 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 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.

Infectious Illness Risk: An outbreak of an infectious illness, such as the COVID-19 pandemic, may adversely impact the economies of many nations and the global economy, and may impact individual issuers and capital markets in ways that cannot be foreseen. An infectious illness outbreak may result in, among other things, closed international borders, prolonged quarantines, supply chain disruptions, market volatility or disruptions and other significant economic, social and political impacts.

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 Master Portfolio may invest in illiquid investments. An illiquid investment is any investment that the Master Portfolio 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 Master Portfolio 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 Master Portfolio’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 the Master Portfolio may lose value, regardless of the individual results of the securities and other instruments in which the Master Portfolio invests.

The price the Master Portfolio could receive upon the sale of any particular portfolio investment may differ from the Master Portfolio’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 the Master Portfolio’s results of operations. As a result, the price received upon the sale of an investment may be less than the value ascribed

54 2 0 2 2   BLACK ROCK  ANNUAL  REPORT  TO   SHAREHOLDERS

Notes to Financial Statements  (continued)

by the Master Portfolio, and the Master Portfolio could realize a greater than expected loss or lesser than expected gain upon the sale of the investment. The Master Portfolio’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 Master Portfolio 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 Master Portfolio 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 of those counterparties. Financial assets, which potentially expose the Master Portfolio to market, issuer and counterparty credit risks, consist principally of financial instruments and receivables due from counterparties. The extent of the Master Portfolio’s 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 Master Portfolio.

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 Master Portfolio 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 Master Portfolio 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 Master Portfolio.

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 Master Portfolio’s portfolio are disclosed in its Schedule of Investments.

The Master Portfolio invests a significant portion of its assets in fixed-income securities and/or uses 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 decrease as interest rates rise and increase as interest rates fall. The Master Portfolio may be subject to a greater risk of rising interest rates due to the recent period of historically low interest rates. The Federal Reserve has recently begun to raise the federal funds rate as part of its efforts to address inflation. There is a risk that interest rates will continue to rise, which will likely drive down the prices of bonds and other fixed-income securities, and could negatively impact the Master Portfolio’s performance.

The Master Portfolio invests a significant portion of its assets in securities backed by commercial or residential mortgage loans or in issuers that hold mortgage and other asset-backed securities. When a Master Portfolio concentrates its investments in this manner, it assumes a greater risk of prepayment or payment extension by securities issuers. Changes in economic conditions, including delinquencies and/or defaults on assets underlying these securities, can affect the value, income and/or liquidity of such positions. Investment percentages in these securities are presented in the Schedule of Investments.

Significant Shareholder Redemption Risk: Certain shareholders may own or manage a substantial amount of fund shares and/or hold their fund investments for a limited period of time. Large redemptions of fund shares by these shareholders may force a fund to sell portfolio securities, which may negatively impact the fund’s NAV, increase the fund’s brokerage costs, and/or accelerate the realization of taxable income/gains and cause the fund to make additional taxable distributions to shareholders.

LIBOR Transition Risk: The United Kingdom’s Financial Conduct Authority announced a phase out of the London Interbank Offered Rate (“LIBOR”). Although many LIBOR rates ceased to be published or no longer are 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 Master Portfolio 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 Master Portfolio is uncertain.

11. SUBSEQUENT EVENTS

Management has evaluated the impact of all subsequent events on the Master Portfolio 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.

MASTER  PORTFOLIO  NOTES  TO  FINANCIAL  STATEMENTS 55

Report of Independent Registered Public Accounting Firm

To the Board of Trustees of Master Investment Portfolio II and Investors of Advantage CoreAlpha Bond Master Portfolio

Opinion on the Financial Statements

We have audited the accompanying statement of assets and liabilities, including the schedule of investments, of Advantage CoreAlpha Bond Master Portfolio (constituting Master Investment Portfolio II, referred to hereafter as the “Master Portfolio”) as of December 31, 2022, the related statement of operations for the year ended December 31, 2022, the statements of changes in net assets for each of the two years in the period ended December 31, 2022, including the related notes, and the financial highlights for each of the five years in the period ended December 31, 2022 (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Master Portfolio as of December 31, 2022, 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 ended December 31, 2022 and the financial highlights for each of the five years in the period ended December 31, 2022 in conformity with accounting principles generally accepted in the United States of America.

Basis for Opinion

These financial statements are the responsibility of the Master Portfolio’s management. Our responsibility is to express an opinion on the Master Portfolio’s financial statements 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 Master Portfolio 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 of these financial statements 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 are free of material misstatement, whether due to error or fraud.

Our audits included performing procedures to assess the risks of material misstatement of the financial statements, 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. 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. Our procedures included confirmation of securities owned as of December 31, 2022 by correspondence with the custodian, transfer agent 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.

/s/PricewaterhouseCoopers LLP

Philadelphia, Pennsylvania

February 23, 2023

We have served as the auditor of one or more BlackRock investment companies since 2000.

56 2 0 2 2   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 VI and Master Investment Portfolio II (the “Trusts”) have adopted and implemented a liquidity risk management program (the “Program”) for BlackRock Advantage CoreAlpha Bond Fund and Advantage CoreAlpha Bond Master Portfolio (the “Funds”), each a series of the respective Trust, which is reasonably designed to assess and manage each Fund’s liquidity risk.

The Board of Trustees (the “Board”) of the Trusts, on behalf of the Funds, met on November 10-11, 2022 (the “Meeting”) to review the Program. The Board previously appointed BlackRock Advisors, LLC, the investment adviser to each Fund, as the program administrator for each Fund’s Program. 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, 2021 through September 30, 2022 (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. A fund’s 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 utilized for liquidity classifications. 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, and BlackRock Floating Rate Loan ETF, a series of BlackRock ETF Trust II). 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 classification 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 57

Trustee and Officer Information  

Independent Trustees(a)
Name Year of Birth(b)	Position(s) Held (Length of Service)(c)	Principal Occupation(s) During Past 5 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 5 Years
R. Glenn Hubbard 1958	Chair of the Board (Since 2022) Trustee (Since 2019)	Dean, Columbia Business School from 2004 to 2019; Faculty member, Columbia Business School since 1988.	70 RICs consisting of 102 Portfolios	ADP (data and information services) from 2004 to 2020; Metropolitan Life Insurance Company (insurance); TotalEnergies SE (multi-energy)
W. Carl Kester(d) 1951	Vice Chair of the Board (Since 2022) Trustee (Since 2019)	George Fisher Baker Jr. Professor of Business Administration, Harvard Business School since 2008; Deputy Dean for Academic Affairs from 2006 to 2010; Chairman of the Finance Unit, from 2005 to 2006; Senior Associate Dean and Chairman of the MBA Program from 1999 to 2005; Member of the faculty of Harvard Business School since 1981.	72 RICs consisting of 104 Portfolios	None
Cynthia L. Egan 1955	Trustee (Since 2019)	Advisor, U.S. Department of the Treasury from 2014 to 2015; President, Retirement Plan Services, for T. Rowe Price Group, Inc. from 2007 to 2012; executive positions within Fidelity Investments from 1989 to 2007.	70 RICs consisting of 102 Portfolios	Unum (insurance); The Hanover Insurance Group (Board Chair); Huntsman Corporation (Lead Independent Director and non Executive Vice Chair of the Board) (chemical products)
Frank J. Fabozzi(d) 1948	Trustee (Since 2019)	Editor of The Journal of Portfolio Management since 1986; Professor of Finance, EDHEC Business School (France) from 2011 to 2022; Professor of Practice, Johns Hopkins University since 2021; Professor in the Practice of Finance, Yale University School of Management from 1994 to 2011 and currently a Teaching Fellow in Yale’s Executive Programs; Visiting Professor, Rutgers University for the Spring 2019 semester; Visiting Professor, New York University for the 2019 academic year; Adjunct Professor of Finance, Carnegie Mellon University in fall 2020 semester.	72 RICs consisting of 104 Portfolios	None
Lorenzo A. Flores 1964	Trustee (Since 2021)	Vice Chairman, Kioxia, Inc. since 2019; Chief Financial Officer, Xilinx, Inc. from 2016 to 2019; Corporate Controller, Xilinx, Inc. from 2008 to 2016.	70 RICs consisting of 102 Portfolios	None
Stayce D. Harris 1959	Trustee (Since 2021)	Lieutenant General, Inspector General, Office of the Secretary of the United States Air Force from 2017 to 2019; Lieutenant General, Assistant Vice Chief of Staff and Director, Air Staff, United States Air Force from 2016 to 2017; Major General, Commander, 22nd Air Force, AFRC, Dobbins Air Reserve Base, Georgia from 2014 to 2016; Pilot, United Airlines from 1990 to 2020.	70 RICs consisting of 102 Portfolios	The Boeing Company (airplane manufacturer)
J. Phillip Holloman 1955	Trustee (Since 2021)	President and Chief Operating Officer, Cintas Corporation from 2008 to 2018.	70 RICs consisting of 102 Portfolios	PulteGroup, Inc. (home construction); Rockwell Automation Inc. (industrial automation)

58 2 0 2 2   BLACK ROCK  ANNUAL  REPORT  TO   SHAREHOLDERS

Trustee and Officer Information  (continued)

Independent Trustees(a) (continued)
Name Year of Birth(b)	Position(s) Held (Length of Service)(c)	Principal Occupation(s) During Past 5 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 5 Years
Catherine A. Lynch(d) 1961	Trustee (Since 2019)	Chief Executive Officer, Chief Investment Officer and various other positions, National Railroad Retirement Investment Trust from 2003 to 2016; Associate Vice President for Treasury Management, The George Washington University from 1999 to 2003; Assistant Treasurer, Episcopal Church of America from 1995 to 1999.	72 RICs consisting of 104 Portfolios	PennyMac Mortgage Investment Trust
Interested Trustees(a)(e)
Name Year of Birth(b)	Position(s) Held (Length of Service)(c)	Principal Occupation(s) During Past 5 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 5 Years
Robert Fairbairn 1965	Trustee (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.	98 RICs consisting of 266 Portfolios	None
John M. Perlowski(d) 1964	Trustee (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.	100 RICs consisting of 268 Portfolios	None

^(a)  The address of each Trustee is c/o BlackRock, Inc., 55 East 52nd Street, New York, New York 10055.

^(b)  Each Independent Trustee holds office until his or her successor is duly elected and qualifies or until his or her earlier death, resignation, retirement or removal as provided by the Trust’s by-laws or charter or statute, or until December 31 of the year in which he or she turns 75. Trustees who are “interested persons,” as defined in the Investment Company Act serve until their successor is duly elected and qualifies or until their earlier death, resignation, retirement or removal as provided by the Trust’s by-laws or statute, or until December 31 of the year in which they turn 72. The Board may determine to extend the terms of Independent Trustees 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. Certain Independent Trustees first became members of the boards of other legacy MLIM or legacy BlackRock funds as follows: Frank J. Fabozzi, 1988; R. Glenn Hubbard, 2004; and W. Carl Kester, 1995. Certain other Independent Trustees became members of the boards of the closed-end funds in the Fixed-Income Complex as follows: Cynthia L. Egan, 2016; and Catherine A. Lynch, 2016.

^(d)  Dr. Fabozzi, Dr. Kester, Ms. Lynch and Mr. Perlowski are also trustees of the BlackRock Credit Strategies Fund and BlackRock Private Investments Fund.

^(e)  Mr. Fairbairn and Mr. Perlowski are both “interested persons,” as defined in the 1940 Act, of the Trust based on their positions with BlackRock, Inc. and its affiliates. Mr. Fairbairn and Mr. Perlowski are also board members of the BlackRock Multi-Asset Complex.

T R U S T E E   A N D   O F F I C E R   I N F O R M A T I O N 59

Trustee and Officer Information  (continued)

Officers Who Are Not Trustees(a)
Name Year of Birth(b)	Position(s) Held (Length of Service)	Principal Occupation(s) During Past 5 Years
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.
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 serve at the pleasure of the Board.

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

Effective May 31, 2022, Karen P. Robards retired as a Trustee of the Trusts.

60 2 0 2 2   BLACK ROCK  ANNUAL  REPORT  TO   SHAREHOLDERS

Additional Information

General Information

Quarterly performance, semi-annual and annual reports, current net asset value and other information regarding the Fund/Master Portfolio 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 Fund/Master Portfolio and does not, and is not intended to, incorporate BlackRock’s website in this report.

Householding

The Fund 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 Fund at (800) 441-7762.

Availability of Quarterly Schedule of Investments

The Fund/Master Portfolio 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 Fund’s/Master Portfolio’s Forms N-PORT are available on the SEC’s website at sec.gov. Additionally, the Fund/Master Portfolio makes their 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 Fund/Master Portfolio use to determine how to vote proxies relating to portfolio securities and information about how the Fund/Master Portfolio voted proxies relating to securities held in the Fund’s/Master Portfolio’s 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.

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.

ADDITIONAL  INFORMATION 61

Additional Information  (continued)

BlackRock Privacy Principles (continued)

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/or MIP II Service Providers
Investment Adviser and Administrator	Distributor
BlackRock Advisors, LLC	BlackRock Investments, LLC
Wilmington, DE 19809	New York, NY 10022
Sub-Adviser	Independent Registered Public Accounting Firm
BlackRock Fund Advisors	PricewaterhouseCoopers LLP
San Francisco, CA 94105	Philadelphia, PA 19103
BlackRock International Limited	Legal Counsel
Edinburgh, EH3 8BL	Willkie Farr & Gallagher LLP
United Kingdom	New York, NY 10019
Accounting Agent and Custodian	Address of the Fund/MIP II
State Street Bank and Trust Company	100 Bellevue Parkway
Boston, MA 02111	Wilmington, DE 19809
Transfer Agent
BNY Mellon Investment Servicing (US) Inc.
Wilmington, DE 19809

62 2 0 2 2   BLACK ROCK  ANNUAL  REPORT  TO   SHAREHOLDERS

Glossary of Terms Used in this Report

Currency Abbreviation
AUD	Australian Dollar
CAD	Canadian Dollar
CHF	Swiss Franc
CZK	Czech Koruna
EUR	Euro
GBP	British Pound
HKD	Hong Kong Dollar
MXN	Mexican Peso
NOK	Norwegian Krone
NZD	New Zealand Dollar
PLN	Polish Zloty
SEK	Swedish Krona
SGD	Singapore Dollar
THB	Thai Baht
USD	United States Dollar
ZAR	South African Rand

Portfolio Abbreviation
ARB	Airport Revenue Bonds
BAB	Build America Bond
BBR	Bank Bill Rate
BBSW	Bank Bill Swap Rate
CMT	Constant Maturity Treasury
EURIBOR	Euro Interbank Offered Rate
FEDL	Fed Funds Effective Rate
GO	General Obligation Bonds
HIBOR	Hong Kong Interbank Offered Rate
JIBAR	Johannesburg Interbank Average Rate
LIBOR	London Interbank Offered Rate
MXIBOR	Mexico Interbank Offered Rate
NIBOR	Norwegian Interbank Offered Rate
PRIBOR	Prague Interbank Offer Rate
RB	Revenue Bond
REMIC	Real Estate Mortgage Investment Conduit
SAB	Special Assessment Bonds
SOFR	Secured Overnight Financing Rate
SONIA	Sterling Overnight Interbank Average Rate
SORA	Singapore Overnight Rate Average
SSARON	Swiss Average Overnight Rate
STACR	Structured Agency Credit Risk
STIBOR	Stockholm Interbank Offered Rate
TBA	To-Be-Announced
THOR	Thai Overnight Repurchase Rate
WIBOR	Warsaw Interbank Offered Rate

GLOSSARY  OF  TERMS  USED  IN  THIS  REPORT 63

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 Fund 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.

CAB-12/22-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:

Frank J. Fabozzi

Lorenzo A. Flores

Catherine A. Lynch

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 PricewaterhouseCoopers LLP (“PwC”) 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
BlackRock Advantage CoreAlpha Bond Fund	$11,000	$11,110	$0	$0	$10,750	$8,100	$0	$0
Advantage CoreAlpha Bond Master Portfolio	$43,300	$43,300	$0	$0	$27,500	$22,700	$0	$0

The following table presents fees billed by PwC 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”):

2

	Current Fiscal Year End	Previous Fiscal Year End
(b) Audit-Related Fees1	$0	$0
(c) Tax Fees2	$0	$0
(d) All Other Fees3	$0	$0

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 Aggregate fees borne by BlackRock in connection with the review of compliance procedures and attestation thereto performed by PwC with respect to all of the registered closed-end funds and some of the registered open-end funds advised by BlackRock.

(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 registrant’s 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 registrant 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 either 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:

3

Entity Name	Current Fiscal     Year End	Previous     Fiscal Year     End
BlackRock Advantage CoreAlpha Bond Fund	$10,750	$8,100
Advantage CoreAlpha Bond Master Portfolio	$27,500	$22,700

(h) Each 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.

(i) – Not Applicable

(j) – Not Applicable

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.

4

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

5

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 Funds VI and Master Investment Portfolio II

By:	/s/ John M. Perlowski
	John M. Perlowski
	Chief Executive Officer (principal executive officer) of
	BlackRock Funds VI and Master Investment Portfolio II

Date: February 23, 2023

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 Funds VI and Master Investment Portfolio II

Date: February 23, 2023

By:	/s/ Trent Walker
	Trent Walker
	Chief Financial Officer (principal financial officer) of
	BlackRock Funds VI and Master Investment Portfolio II

Date: February 23, 2023

6