Blackrock Mid Cap Dividend Series N-CSRS Certified semi-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: 811-07177

Name of Fund:  BlackRock Mid Cap Dividend Fund of BlackRock Mid Cap Dividend Series, Inc. (Formerly BlackRock Mid Cap Value Opportunities Fund of BlackRock Mid Cap Value Opportunities Series, Inc.)

Fund Address:   100 Bellevue Parkway, Wilmington, DE 19809

Name and address of agent for service: John M. Perlowski, Chief Executive Officer, BlackRock Mid Cap Dividend Fund of BlackRock Mid Cap Dividend Series, Inc. (Formerly BlackRock Mid Cap Value Opportunities Fund of BlackRock Mid Cap Value Opportunities Series, Inc.), 55 East 52^nd Street, New York, NY 10055

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

Date of fiscal year end: 01/31/2018

Date of reporting period: 07/31/2017

Item 1 – Report to Stockholders

JULY 31, 2017

  SEMI-ANNUAL REPORT (UNAUDITED)  

BlackRock Mid Cap Dividend Fund  |  of BlackRock Mid Cap Dividend Series, Inc.

Not FDIC Insured • May Lose Value • No Bank Guarantee

The Markets in Review

Dear Shareholder,

In the 12 months ended July 31, 2017, risk assets, such as stocks and high-yield bonds, continued to deliver strong performance. These markets showed great resilience during a period with big surprises, including the aftermath of the U.K.’s vote to leave the European Union and the outcome of the U.S. presidential election, which brought only brief spikes in equity market volatility. These expressions of isolationism and discontent were countered by the closely watched and less surprising elections in France, the Netherlands and Australia.

Interest rates rose, which worked against high-quality assets with more interest rate sensitivity. Aside from the shortest-term Treasury bills, most U.S. Treasuries posted negative returns, as rising energy prices, modest wage increases and steady job growth led to expectations of higher inflation and anticipation of interest rate increases by the U.S. Federal Reserve (the “Fed”).

The global reflationary theme — rising nominal growth, wages and inflation — was the dominant driver of asset returns during the period, outweighing significant political upheavals and economic uncertainty. Reflationary expectations accelerated after the U.S. election in November 2016 and continued into the beginning of 2017, stoked by expectations that the new administration’s policies would provide an extra boost to U.S. growth.

The Fed has responded to these positive developments by increasing interest rates three times in the last six months, setting expectations for additional interest rate increases and moving toward normalizing monetary policy. Divergent global monetary policy continued in earnest, as the European Central Bank and the Bank of Japan reiterated their commitments to economic stimulus despite nascent signs of sustained economic growth in both countries.

In recent months, growing skepticism about the near-term likelihood of significant U.S. tax reform and infrastructure spending has tempered enthusiasm around the reflation trade. Similarly, renewed concern about oversupply has weighed on energy prices. Nonetheless, financial markets — and to an extent the Fed — have adopted a “wait-and-see” approach to the economic data and potential fiscal stimulus. Although uncertainty has persisted, benign credit conditions, modest inflation and the positive outlook for economic growth have kept markets relatively tranquil.

Although economic momentum is gaining traction, the capacity for rapid global growth is restrained by structural factors, including an aging population, low productivity growth and excess savings, as well as cyclical factors, such as the Fed moving toward the normalization of monetary policy and the length of the current expansion. Tempered economic growth and high valuations across most assets have set the stage for muted returns going forward. At current valuation levels, potential equity gains will likely be closely tied to the pace of earnings growth, which has remained solid thus far in 2017.

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

Sincerely,

Rob Kapito

President, BlackRock Advisors, LLC

Rob Kapito

President, BlackRock Advisors, LLC

Total Returns as of July 31, 2017
	6-month			12-month
U.S. large cap equities (S&P 500® Index)		9.51	%		16.04	%
U.S. small cap equities (Russell 2000® Index)		5.35			18.45
International equities (MSCI Europe, Australasia, Far East Index)		13.79			17.77
Emerging market equities (MSCI Emerging Markets Index)		18.98			24.84
3-month Treasury bills (BofA Merrill Lynch 3-Month U.S. Treasury Bill Index)		0.35			0.54
U.S. Treasury securities (BofA Merrill Lynch 10-Year U.S. Treasury Index)		2.33			(5.73	)
U.S. investment grade bonds (Bloomberg Barclays U.S. Aggregate Bond Index)		2.51			(0.51	)
Tax-exempt municipal bonds (S&P Municipal Bond Index)		3.40			0.36
U.S. high yield bonds (Bloomberg Barclays U.S. Corporate High Yield 2% Issuer Capped Index)		4.57			10.94
Past performance is no guarantee of future results. Index performance is shown for illustrative purposes only. You cannot invest directly in an index.

2 THIS PAGE NOT PART OF YOUR FUND REPORT

Table of Contents

	Page
The Markets in Review		2
Semi-Annual Report:
Fund Summary		4
About Fund Performance		7
Disclosure of Expenses		7
Derivative Financial Instruments		7
Financial Statements:
Schedule of Investments		8
Statement of Assets and Liabilities		11
Statement of Operations		12
Statements of Changes in Net Assets		13
Financial Highlights		14
Notes to Financial Statements		18
Disclosure of Investment Advisory Agreement		26
Officers and Directors		30
Additional Information		30

BLACKROCK MID CAP DIVIDEND FUND JULY 31, 2017 3

Fund Summary as of July 31, 2017

Investment Objective

BlackRock Mid Cap Dividend Fund’s (the “Fund”) investment objective is to seek capital appreciation and, secondarily, income, by investing in securities, primarily equity securities that the Fund’s management believes are undervalued and therefore represent an investment value.

On March 27, 2017, the Fund’s Board approved a proposal to change the name of BlackRock Mid Cap Value Opportunities Fund to BlackRock Mid Cap Dividend Fund. The Board also approved certain changes to the Fund’s investment strategies. In addition, the Fund’s Manager has determined to change the benchmark indices against which the Fund compares its performance. These changes were effective on June 12, 2017.

Portfolio Management Commentary

How did the Fund perform?

• For the six-month period ended July 31, 2017, the Fund underperformed its benchmark, the Russell MidCap^® Value Index.

What factors influenced performance?

• The largest detractor from performance during the period came from stock selection in the consumer discretionary sector. Increasing competitive pressure within the specialty retail segment negatively impacted the Fund’s overweight holdings in Dick’s Sporting Goods, Inc., Foot Locker, Inc. and Bed Bath and Beyond Inc. Stock selection in the materials sector also detracted from performance, in particular within the chemicals and paper & forest products industries. In real estate, stock selection among equity real estate investment trusts (“REITs”) represented a drag on relative results, as overweight positions in Tanger Factory Outlet Centers, Inc. and Outfront Media, Inc. were significant detractors. In addition, stock selection in the financials and health care sectors weighed on relative results.

• The largest positive contribution to relative performance for the period came from stock selection in the telecommunication services (“telecom”) sector, as the decision to not hold benchmark holdings Frontier Communications Corp. and Level 3 Communications Inc. proved beneficial. In the energy sector, stock selection among energy equipment & services firms was a significant contributor. In particular, the decisions to not hold Nabors Industries Ltd. and to be underweight in Ensco PLC helped returns. Additionally, the decision not to hold QEP Resources, Inc. and WPX Energy, Inc. within the oil, gas & consumable fuels industry bolstered relative performance.

Describe recent portfolio activity.

• During the period, the Fund’s exposure to the utilities, telecom, information technology (“IT”) and health care sectors was increased. The Fund’s allocation in utilities was boosted by initiating positions in companies that included FirstEnergy Corp., Great Plains Energy Inc., Edison International, and Entergy Corp. Within telecom, exposure was increased via new positions in BCE Inc., CenturyLink, Inc., and Telephone and Data Systems, Inc. Notable transactions within IT included new positions in CDW Corp. and Analog Devices, Inc., while notable transactions in health care included new positions in Smith & Nephew PLC and WellCare Health Plans, Inc. Conversely, the Fund reduced exposure to the industrials sector by exiting positions in AECOM and AMETEK, Inc. Additionally, the Fund’s exposure to materials was decreased, in part by exiting positions in Domtar Corp., Westlake Chemical Corp., and Carpenter Technology Corp. Lastly, the Fund reduced its allocations to the real estate and consumer discretionary sectors during the period. Within real estate, the Fund sold its positions in Outfront Media, Inc., Alexander & Baldwin, Inc., and LTC Properties, Inc. Within consumer discretionary, the Fund exited holdings in Cable One, Inc., Dicks Sporting Goods, Inc. and Dollar Tree, Inc.

Describe portfolio positioning at period end.

• At the end of the period, the Fund’s largest allocations were in the financials, IT and utilities sectors. Relative to the benchmark, the largest overweight positions were in IT, telecom and health care. Conversely, the largest underweights were in the real estate, consumer discretionary and industrials sectors.

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 BLACKROCK MID CAP DIVIDEND FUND JULY 31, 2017

Total Return Based on a $10,000 Investment

¹  Assuming maximum sales charges, if any, transaction costs and other operating expenses, including investment advisory fees. Institutional Shares do not have a sales charge.

²  Under normal circumstances, the Fund invests at least 80% of its net assets plus the amount of any borrowings for investment purposes in equity securities of mid cap companies and at least 80% of its net assets plus the amount of any borrowings for investment purposes in dividend-paying securities. The Fund’s total returns prior to June 12, 2017 are the returns of the Fund when it followed different investment strategies under the name BlackRock Mid Cap Value Opportunities Fund.

³  An unmanaged index that measures the performance of the mid-capitalization value sector of the U.S. equity market. It is a subset of the S&P MidCap 400^® Index and consists of those stocks in the S&P MidCap 400^® Index exhibiting the strongest value characteristics, as determined by the index provider, representing approximately 50% of the market capitalization of the S&P MidCap 400^® Index.

⁴  An unmanaged index that measures the performance of the mid-capitalization value sector of the U.S. equity market. It is a subset of the Russell Midcap^® Index, which measures the performance of the mid-capitalization sector of the U.S. equity market. The Russell Midcap^® Value Index measures the performance of equity securities of Russell Midcap^® Index issuers with relatively lower price-to-book ratios and lower forecasted growth. The Russell Midcap^® Index is a float-adjusted, capitalization-weighted index of approximately 793 of the smallest issuers in the Russell 1000^® Index and includes securities issued by issuers which range in size between approximately $10 million and $85 billion, although this range may change from time to time.

Performance Summary for the Period Ended July 31, 2017

				Average Annual Total Returns2,5
				1 Year						5 Years						10 Years
	6-Month Total Returns			w/o sales charge			w/sales charge			w/o sales charge			w/sales charge			w/o sales charge			w/sales charge
Institutional		(0.10	)%		12.08	%		N/A			13.10	%		N/A			7.59	%		N/A
Investor A		(0.28	)		11.67			5.81	%		12.76			11.55	%		7.23			6.65	%
Investor C		(0.66	)		10.83			10.02			11.85			11.85			6.26			6.26
Class R		(0.39	)		11.34			N/A			12.42			N/A			6.86			N/A
Russell MidCap® Value Index		4.81			12.69			N/A			15.32			N/A			7.99			N/A
S&P MidCap 400® Value Index		2.81			14.91			N/A			15.26			N/A			8.40			N/A

⁵ 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” on page 7 for a detailed description of share classes, including any related sales charges and fees.

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

Past performance is not indicative 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						Hypothetical7
	Beginning Account Value February 1, 2017		Ending Account Value July 31, 2017		Expenses Paid During the Period6		Beginning Account Value February 1, 2017		Ending Account Value July 31, 2017		Expenses Paid During the Period6		Annualized Expense Ratio
Institutional	$	1,000.00	$	999.00	$	4.26	$	1,000.00	$	1,020.53	$	4.31		0.86	%
Investor A	$	1,000.00	$	997.20	$	5.69	$	1,000.00	$	1,019.09	$	5.76		1.15	%
Investor C	$	1,000.00	$	993.40	$	9.54	$	1,000.00	$	1,015.22	$	9.64		1.93	%
Class R	$	1,000.00	$	996.10	$	7.18	$	1,000.00	$	1,017.60	$	7.25		1.45	%

⁶  For each class of the Fund, expenses are equal to the annualized net expense ratio for the class, multiplied by the average account value over the period, multiplied by 181/365 (to reflect the one-half year period shown).

⁷ Hypothetical 5% annual return before expenses is calculated by prorating the number of days in the most recent fiscal half year divided by 365.

See “Disclosure of Expenses” on page 7 for further information on how expenses were calculated.

BLACKROCK MID CAP DIVIDEND FUND JULY 31, 2017 5

Fund Summary (concluded)

Portfolio Information

Ten Largest Holdings	Percent of Net  Assets
CDW Corp.		2	%
Analog Devices, Inc.		2
FirstEnergy Corp.		2
Great Plains Energy, Inc.		2
Cummins, Inc.		2
Assurant, Inc.		2
SunTrust Banks, Inc.		2
Regions Financial Corp.		2
Lamar Advertising Co.		2
Telephone & Data Systems, Inc.		2

Sector Allocation	Percent of Net Assets
Financials		21	%
Information Technology		16
Utilities		10
Health Care		9
Consumer Discretionary		8
Industrials		8
Energy		8
Real Estate		6
Materials		6
Consumer Staples		4
Telecommunication Services		3
Short-Term Securities		3
Liabilities in Excess of Other Assets		(2	)

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

6 BLACKROCK MID CAP DIVIDEND FUND JULY 31, 2017

About Fund Performance

• Institutional 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 5.25% 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. On June 23, 2015, all issued and outstanding Investor B Shares were converted into Investor A Shares with the same relative aggregate net asset value (“NAV”).

• 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.

• Class R Shares are not subject to any sales charge. These shares are subject to a distribution fee of 0.25% per year and a service fee of 0.25% per year. These shares are available only to certain employer-sponsored retirement plans.

Performance information reflects past performance and does not guarantee future results. Current performance may be lower or higher than the performance data quoted. Refer to www.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 tables on the previous page assume reinvestment of all distributions, if any, at NAV on the ex-dividend date. Investment return and principal value of shares will fluctuate so that shares, when redeemed, may be worth more or less than their original cost. Distributions paid to each class of shares will vary because of the different levels of service, distribution and transfer agency fees applicable to each class, which are deducted from the income available to be paid to shareholders.

BlackRock Advisors, LLC (the “Manager”), the Fund’s investment adviser, contractually and voluntarily waived a portion of the Fund’s expenses. Without such waiver, the Fund’s performance would have been lower. The Manager is under no obligation to waive or to continue waiving its fees and such voluntary waiver may be reduced or discontinued at any time. See Note 5 of the Notes to Financial Statements for additional information on waivers.

Disclosure of Expenses

Shareholders of the Fund may incur the following charges: (a) transactional expenses, such as sales charges; and (b) operating expenses, including investment advisory fees, service and distribution fees, including 12b-1 fees, acquired fund fees and expenses and other fund expenses. The expense example shown on the previous page (which is based on a hypothetical investment of $1,000 invested on February 1, 2017 and held through July 31, 2017) 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. 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 any 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.

Derivative Financial Instruments

The Fund may invest in various derivative financial instruments. These instruments are used to obtain exposure to a security, commodity, index, market, and/or other asset without owning or taking physical custody of securities, commodities and/or other referenced assets or to manage market, equity, credit, interest rate, foreign currency exchange rate, commodity and/or other risks. Derivative financial instruments may give rise to a form of economic leverage and involve risks, including the imperfect correlation between the value of a derivative financial instrument and the underlying asset, possible default of the counterparty to the transaction or

illiquidity of the instrument. The Fund’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 Fund can realize on an investment and/or may result in lower distributions paid to shareholders. The Fund’s investments in these instruments, if any, are discussed in detail in the Notes to Financial Statements.

BLACKROCK MID CAP DIVIDEND FUND JULY 31, 2017 7

Schedule of Investments July 31, 2017 (Unaudited) (Percentages shown are based on Net Assets)

Common Stocks	Shares		Value
Auto Components — 2.2%
Adient PLC		35,250	$	2,307,817
Goodyear Tire & Rubber Co.		63,413		1,998,144
Lear Corp.		23,394		3,466,757
Magna International, Inc.		48,100		2,293,889
				10,066,607
Banks — 9.1%
Cullen/Frost Bankers, Inc.		70,049		6,359,048
KeyCorp		492,353		8,882,048
Popular, Inc.		172,752		7,279,769
Regions Financial Corp.		637,101		9,301,675
SunTrust Banks, Inc.		162,806		9,327,156
				41,149,696
Biotechnology — 1.0%
United Therapeutics Corp. (a)		35,012		4,495,541
Building Products — 1.1%
Owens Corning		71,213		4,774,832
Capital Markets — 1.0%
Invesco Ltd.		133,362		4,636,997
Chemicals — 2.9%
Cabot Corp.		42,921		2,331,898
Eastman Chemical Co.		82,444		6,856,043
Huntsman Corp.		98,457		2,620,925
Praxair, Inc.		8,400		1,093,344
				12,902,210
Communications Equipment — 0.6%
Motorola Solutions, Inc.		31,935		2,895,866
Containers & Packaging — 2.6%
International Paper Co.		83,390		4,584,782
Packaging Corp. of America		21,882		2,395,642
WestRock Co.		80,246		4,607,725
				11,588,149
Diversified Financial Services — 1.6%
Leucadia National Corp.		269,526		7,015,762
Diversified Telecommunication Services — 1.0%
BCE, Inc.		50,625		2,375,831
CenturyLink, Inc.		86,544		2,013,879
				4,389,710
Electric Utilities — 8.3%
Edison International		113,248		8,910,353
Entergy Corp.		115,118		8,831,853
FirstEnergy Corp.		310,010		9,892,419
Great Plains Energy, Inc.		313,572		9,676,832
				37,311,457
Electrical Equipment — 0.5%
Rockwell Automation, Inc.		14,267		2,354,483
Electronic Equipment, Instruments & Components — 6.4%
Avnet, Inc.		132,345		5,079,401
CDW Corp.		172,175		10,921,060
Corning, Inc.		94,523		2,754,400
Dolby Laboratories, Inc., Class A		155,101		8,026,477
TE Connectivity Ltd.		27,900		2,242,881
				29,024,219

Common Stocks	Shares		Value
Energy Equipment & Services — 3.0%
Baker Hughes a GE Co.		43,111	$	1,590,365
Helmerich & Payne, Inc.		62,401		3,158,739
Rowan Cos. PLC, Class A (a)		367,651		4,290,487
Transocean Ltd. (a)		511,925		4,428,151
				13,467,742
Food & Staples Retailing — 0.8%
Kroger Co.		152,092		3,729,296
Food Products — 1.1%
Ingredion, Inc.		40,010		4,934,033
Health Care Equipment & Supplies — 2.0%
Smith & Nephew PLC, ADR		199,950		7,048,237
Zimmer Biomet Holdings, Inc.		17,700		2,147,364
				9,195,601
Health Care Providers & Services — 5.7%
Cardinal Health, Inc.		45,621		3,524,679
Express Scripts Holding Co. (a)		18,200		1,140,048
Humana, Inc.		20,128		4,653,594
McKesson Corp.		28,405		4,597,917
Premier, Inc., Class A (a)		130,408		4,551,239
Quest Diagnostics, Inc.		21,426		2,320,650
WellCare Health Plans, Inc. (a)		26,594		4,706,872
				25,494,999
Hotels, Restaurants & Leisure — 1.6%
Carnival Corp.		34,100		2,277,198
International Game Technology PLC		255,025		4,855,676
				7,132,874
Household Products — 0.9%
Energizer Holdings, Inc.		89,321		4,115,018
Independent Power and Renewable Electricity Producers — 1.0%
AES Corp.		387,734		4,334,866
Industrial Conglomerates — 0.5%
Koninklijke Philips NV		60,200		2,300,606
Insurance — 8.6%
Allstate Corp.		53,237		4,844,567
Assurant, Inc.		90,286		9,504,407
Assured Guaranty Ltd.		166,541		7,496,011
Everest Re Group Ltd.		8,420		2,209,324
Hartford Financial Services Group, Inc.		42,500		2,337,500
Lincoln National Corp.		40,067		2,927,295
Marsh & McLennan Cos., Inc.		28,400		2,214,348
Validus Holdings Ltd.		130,647		7,027,502
				38,560,954
IT Services — 1.0%
Fidelity National Information Services, Inc.		48,289		4,404,923
Leisure Products — 0.9%
Mattel, Inc.		85,938		1,720,479
Polaris Industries, Inc.		24,600		2,205,636
				3,926,115
Machinery — 4.2%
Cummins, Inc.		56,998		9,569,964
Pentair PLC		69,332		4,372,769
Stanley Black & Decker, Inc.		9,500		1,336,555
Terex Corp.		89,819		3,536,174
				18,815,462

Portfolio Abbreviations

ADR American Depositary Receipts

See Notes to Financial Statements.
8	BLACKROCK MID CAP DIVIDEND FUND	JULY 31, 2017

Schedule of Investments (continued)

Common Stocks	Shares		Value
Media — 1.8%
Discovery Communications, Inc., Class C (a)		179,661	$	4,155,559
Interpublic Group of Cos., Inc.		188,860		4,081,265
				8,236,824
Metals & Mining — 0.5%
Reliance Steel & Aluminum Co.		30,041		2,173,767
Multi-Utilities — 1.0%
Public Service Enterprise Group, Inc.		102,783		4,622,151
Multiline Retail — 0.5%
Dollar General Corp.		32,331		2,429,998
Oil, Gas & Consumable Fuels — 5.4%
Devon Energy Corp.		136,605		4,550,313
Hess Corp.		151,093		6,729,682
Marathon Oil Corp.		271,834		3,324,530
Marathon Petroleum Corp.		42,262		2,366,249
Williams Cos., Inc.		232,358		7,384,337
				24,355,111
Personal Products — 0.8%
Nu Skin Enterprises, Inc., Class A		58,450		3,703,392
Professional Services — 1.1%
Nielsen Holdings PLC		120,233		5,171,221
Real Estate Investment Trusts (REITs) — 6.4%
Chimera Investment Corp.		120,204		2,262,239
Crown Castle International Corp.		33,555		3,374,962
Duke Realty Corp.		80,330		2,296,635
Lamar Advertising Co., Class A (b)		128,258		9,051,167
Prologis, Inc.		59,743		3,632,972
Rayonier, Inc.		118,713		3,450,987
Welltower, Inc. (b)		62,104		4,557,812
				28,626,774
Real Estate Management & Development — 0.6%
Realogy Holdings Corp.		76,006		2,523,399
Road & Rail — 0.2%
Norfolk Southern Corp.		9,612		1,082,119

Common Stocks	Shares		Value
Semiconductors & Semiconductor Equipment — 3.6%
Analog Devices, Inc.		131,713	$	10,406,644
Lam Research Corp.		18,772		2,993,383
Xilinx, Inc.		42,802		2,707,655
				16,107,682
Software — 2.7%
CA, Inc.		85,500		2,653,920
Constellation Software, Inc.		8,052		4,337,779
Symantec Corp.		170,900		5,296,191
				12,287,890
Specialty Retail — 1.0%
Bed Bath & Beyond, Inc.		78,426		2,344,937
Williams-Sonoma, Inc.		46,602		2,163,731
				4,508,668
Technology Hardware, Storage & Peripherals — 1.8%
NetApp, Inc.		129,688		5,631,053
Western Digital Corp.		31,692		2,697,623
				8,328,676
Wireless Telecommunication Services — 2.0%
Telephone & Data Systems, Inc.		317,596		9,029,254
Total Long-Term Investments (Cost — $442,753,258) — 99.0%				446,204,944
Short-Term Securities
BlackRock Liquidity Funds, T-Fund, Institutional Class, 0.89% (c)(d)		4,917,291		4,917,291
SL Liquidity Series, LLC, Money Market Series, 1.29% (c)(d)(e)		8,684,683		8,686,420
Total Short-Term Securities (Cost — $13,602,486) — 3.0%				13,603,711
Total Investments (Cost — $456,355,744) — 102.0%			$	459,808,655
Liabilities in Excess of Other Assets — (2.0)%				(9,178,910	)
Net Assets — 100.0%			$	450,629,745

Notes to Schedule of Investments

(a) Non-income producing security.

(b) Security, or a portion of the security, is on loan.

(c) During the six months ended July 31, 2017, investments in issuers considered to be affiliates of the Fund for purposes of Section 2(a)(3) of the Investment Company Act of 1940, as amended, were as follows:

Affiliate	Shares Held at January 31, 2017		Net Activity			Shares Held at July 31, 2017		Value at July 31, 2017		Income			Net Realized Gain		Change in Unrealized Appreciation (Depreciation)
BlackRock Liquidity Funds, T-Fund, Institutional Class		2,845,048		2,072,243			4,917,291	$	4,917,291	$	14,837			—		—
SL Liquidity Series, LLC, Money Market Series		44,021,709		(35,337,026	)		8,684,683		8,686,420		97,092	1	$	3,586	$	(3,976	)
Total								$	13,603,711	$	111,929		$	3,586	$	(3,976	)
1   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.

(d) Current yield as of period end.

(e) Security was purchased with the cash collateral from loaned securities.

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

See Notes to Financial Statements.
	BLACKROCK MID CAP DIVIDEND FUND	JULY 31, 2017	9

Schedule of Investments (concluded)

Derivative Financial Instruments Categorized by Risk Exposure

For the six months ended July 31, 2017, the effect of derivative financial instruments in the Statement of Operation was as follows:

Net Realized Gain (Loss) from:	Commodity Contracts		Credit Contracts		Equity Contracts		Foreign Currency Exchange Contracts		Interest Rate Contracts		Other Contracts		Total
Futures contracts		—		—		—	$	73,069		—		—	$	73,069

Average Quarterly Balances of Outstanding Derivative Financial Instruments

Futures contracts:
Average notional value of contracts – long	$	23,466,240	1
Average notional value of contracts – short	$	4,018,245	1
1    Actual amounts for the period are shown due to limited outstanding derivative financial instruments as of each quarter end.

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

Fair Value Hierarchy as of Period End

Various inputs are used in determining the fair value of investments. For information about the Fund’s policy regarding valuation of investments, refer to the Notes to Financial Statements.

The following table summarizes the Fund’s investments categorized in the disclosure hierarchy:

	Level 1		Level 2		Level 3		Total
Assets:
Investments:
Long-Term Investments1	$	443,904,338	$	2,300,606		—	$	446,204,944
Short-Term Securities		4,917,291		—		—		4,917,291
Subtotal	$	448,821,629	$	2,300,606		—	$	451,122,235
Investments valued at NAV2								8,686,420
Total							$	459,808,655
1    See above Schedule of Investments for values in each industry.
2    As of July 31, 2017, certain of the Fund’s investments were fair valued using NAV per share as no quoted market value is available and therefore have been excluded from the fair value hierarchy.

During the six months ended July 31, 2017, there were no transfers between levels.

See Notes to Financial Statements.
10	BLACKROCK MID CAP DIVIDEND FUND	JULY 31, 2017

Statement of Assets and Liabilities

July 31, 2017 (Unaudited)
Assets
Investments at value — unaffiliated (including securities loaned at value of $8,460,956) (cost — $442,753,258)	$	446,204,944
Investments at value — affiliated (cost — $13,602,486)		13,603,711
Foreign currency at value (cost — $713)		717
Receivables:
Investments sold		2,934,264
Capital shares sold		306,886
Dividends — unaffiliated		95,893
Dividends — affiliated		4,531
Securities lending income — affiliated		1,745
Deferred offering costs		24,626
Prepaid expenses		39,484
Total assets		463,216,801
Liabilities
Cash collateral on securities loaned at value		8,680,920
Payables:
Investments purchased		1,676,825
Capital shares redeemed		1,200,647
Investment advisory fees		523,649
Transfer agent fees		161,654
Professional fees		99,507
Service and distribution fees		92,991
Custodian fees		87,165
Officer’s and Directors’ fees		4,331
Other affiliates		4,242
Income dividends		309
Other accrued expenses		54,816
Total liabilities		12,587,056
Net Assets	$	450,629,745
Net Assets Consist of
Paid-in capital	$	445,464,801
Undistributed net investment income		1,931,035
Accumulated net realized loss		(219,006	)
Net unrealized appreciation (depreciation)		3,452,915
Net Assets	$	450,629,745
Net Asset Value
Institutional — Based on net assets of $157,394,462 and 9,032,628 shares outstanding, 20 Million shares authorized, $0.10 par value	$	17.43
Investor A — Based on net assets of $216,498,758 and 13,022,709 shares outstanding, 40 Million shares authorized, $0.10 par value	$	16.62
Investor C — Based on net assets of $30,288,086 and 2,290,400 shares outstanding, 40 million shares authorized, $0.10 par value	$	13.22
Class R — Based on net assets of $46,448,439 and 3,216,904 shares outstanding, 40 million shares authorized, $0.10 par value	$	14.44

See Notes to Financial Statements.
	BLACKROCK MID CAP DIVIDEND FUND	JULY 31, 2017	11

Statement of Operations

Six Months Ended July 31, 2017 (Unaudited)
Investment Income
Dividends — unaffiliated	$	4,658,624
Securities lending income — affiliated — net		97,092
Dividends — affiliated		14,837
Foreign taxes withheld		(1,815	)
Total investment income		4,768,738
Expenses
Investment advisory		1,665,543
Service and distribution — class specific		627,577
Transfer agent — class specific		440,510
Accounting services		48,395
Professional		87,120
Printing		20,206
Registration		39,372
Custodian		21,887
Officer and Directors		11,659
Miscellaneous		11,246
Total expenses		2,973,515
Less:
Fees waived by the Manager		(1,366	)
Transfer agent fees reimbursed — class specific		(66,028	)
Total expenses after fees waived and/or reimbursed		2,906,121
Net investment income		1,862,617
Realized and Unrealized Gain (Loss)
Net realized gain (loss) from:
Investments — unaffiliated		67,890,148
Investments — affiliated		3,586
Futures contracts		73,069
Foreign currency transactions		709
		67,967,512
Net change in unrealized appreciation (depreciation) on:
Investments — unaffiliated		(72,156,006	)
Investments — affiliated		(3,976	)
Foreign currency translations		29
		(72,159,953	)
Net realized and unrealized loss		(4,192,441	)
Net Decrease in Net Assets Resulting from Operations	$	(2,329,824	)

See Notes to Financial Statements.
12	BLACKROCK MID CAP DIVIDEND FUND	JULY 31, 2017

Statements of Changes in Net Assets

Increase (Decrease) in Net Assets:	Six Months Ended July 31, 2017 (Unaudited)			Year Ended January 31, 2017
Operations
Net investment income	$	1,862,617		$	2,409,587
Net realized gain		67,967,512			53,287,840
Net change in unrealized appreciation (depreciation)		(72,159,953	)		93,018,133
Net increase (decrease) in net assets resulting from operations		(2,329,824	)		148,715,560
Distributions to Shareholders1
From net investment income:
Institutional		—			(1,322,890	)
Investor A		—			(937,799	)
Class R		—			(108,710	)
From net realized gain:
Institutional		(29,651,720	)		(9,121,054	)
Investor A		(41,414,474	)		(10,617,608	)
Investor C		(6,883,289	)		(3,010,501	)
Class R		(9,803,537	)		(2,666,826	)
Decrease in net assets resulting from distributions to shareholders		(87,753,020	)		(27,785,388	)
Capital Share Transactions
Net decrease in net assets derived from capital share transactions		(10,065,231	)		(3,117,413	)
Net Assets
Total increase (decrease) in net assets		(100,148,075	)		117,812,759
Beginning of period		550,777,820			432,965,061
End of period	$	450,629,745		$	550,777,820
Undistributed net investment income, end of period	$	1,931,035		$	68,418
1   Distributions for annual periods determined in accordance with U.S. federal income tax regulations.

See Notes to Financial Statements.
	BLACKROCK MID CAP DIVIDEND FUND	JULY 31, 2017	13

Financial Highlights

	Institutional
	Six Months Ended July 31, 2017 (Unaudited)			Year Ended January 31,
				2017			2016			2015			2014			2013
Per Share Operating Performance
Net asset value, beginning of period	$	21.24		$	16.52		$	21.37		$	23.30		$	20.43		$	17.92
Net investment income1		0.11			0.15			0.17			0.19			0.17			0.13
Net realized and unrealized gain (loss)		(0.10	)		5.69			(2.22	)		1.24			4.23			2.56
Net increase (decrease) from investment operations		0.01			5.84			(2.05	)		1.43			4.40			2.69
Distributions:2
From net investment income		—			(0.14	)		(0.23	)		(0.17	)		(0.17	)		(0.18	)
From net realized gain		(3.82	)		(0.98	)		(2.57	)		(3.19	)		(1.36	)		—
Total distributions		(3.82	)		(1.12	)		(2.80	)		(3.36	)		(1.53	)		(0.18	)
Net asset value, end of period	$	17.43		$	21.24		$	16.52		$	21.37		$	23.30		$	20.43
Total Return3
Based on net asset value		(0.10	)%4		35.48%			(10.78	)%		6.06%			21.66%			15.12%
Ratios to Average Net Assets
Total expenses		0.87%	5		0.85%			0.94%			0.90%	6		0.86%	6		0.89%
Total expenses after fees waived and/or reimbursed and/or paid indirectly		0.86%	5		0.85%			0.94%			0.90%	6		0.86%	6		0.89%
Net investment income		1.02%	5		0.79%			0.81%			0.77%	6		0.73%	6		0.73%
Supplemental Data
Net assets, end of period (000)	$	157,394		$	207,240		$	144,008		$	154,661		$	182,951		$	133,748
Portfolio turnover rate		129%			93%			73%			65%			57%			55%

¹ Based on average shares outstanding.

² Distributions for annual periods determined in accordance with U.S. federal income tax regulations.

³ Where applicable, assumes the reinvestment of distributions.

⁴ Aggregate total return.

⁵ Annualized.

⁶ Ratios do not include expenses incurred indirectly as a result of investments in underlying funds of approximately 0.02% for the years ended January 31, 2015 and January 31, 2014.

See Notes to Financial Statements.
14	BLACKROCK MID CAP DIVIDEND FUND	JULY 31, 2017

Financial Highlights (continued)

	Investor A
	Six Months Ended July 31, 2017 (Unaudited)			Year Ended January 31,
				2017			2016			2015			2014			2013
Per Share Operating Performance
Net asset value, beginning of period	$	20.46		$	15.95		$	20.71		$	22.69		$	19.94		$	17.44
Net investment income1		0.07			0.09			0.11			0.11			0.10			0.07
Net realized and unrealized gain (loss)		(0.10	)		5.49			(2.14	)		1.20			4.12			2.49
Net increase (decrease) from investment operations		(0.03	)		5.58			(2.03	)		1.31			4.22			2.56
Distributions:2
From net investment income		—			(0.09	)		(0.16	)		(0.11	)		(0.11	)		(0.06	)
From net realized gain		(3.81	)		(0.98	)		(2.57	)		(3.18	)		(1.36	)		—
Total distributions		(3.81	)		(1.07	)		(2.73	)		(3.29	)		(1.47	)		(0.06	)
Net asset value, end of period	$	16.62		$	20.46		$	15.95		$	20.71		$	22.69		$	19.94
Total Return3
Based on net asset value		(0.28	)%4		35.08%			(11.01	)%		5.71%			21.27%			14.74%
Ratios to Average Net Assets
Total expenses		1.17%	5		1.15%			1.20%			1.18%	6		1.16%	6		1.25%
Total expenses after fees waived and/or reimbursed and/or paid indirectly		1.15%	5		1.15%			1.20%			1.18%	6		1.16%	6		1.25%
Net investment income		0.72%	5		0.49%			0.52%			0.48%	6		0.43%	6		0.37%
Supplemental Data
Net assets, end of period (000)	$	216,499		$	235,578		$	197,218		$	305,516		$	314,481		$	215,469
Portfolio turnover rate		129%			93%			73%			65%			57%			55%

¹ Based on average shares outstanding.

² Distributions for annual periods determined in accordance with U.S. federal income tax regulations.

³ Where applicable, excludes the effects of any sales charges and assumes the reinvestment of distributions.

⁴ Aggregate total return.

⁵ Annualized.

⁶ Ratios do not include expenses incurred indirectly as a result of investments in underlying funds of approximately 0.02% for the years ended January 31, 2015 and January 31, 2014.

See Notes to Financial Statements.
	BLACKROCK MID CAP DIVIDEND FUND	JULY 31, 2017	15

Financial Highlights (continued)

	Investor C
	Six Months Ended July 31, 2017 (Unaudited)			Year Ended January 31,
				2017			2016			2015			2014			2013
Per Share Operating Performance
Net asset value, beginning of period	$	17.09		$	13.50		$	17.95		$	20.08		$	17.80		$	15.65
Net investment loss1		(0.01	)		(0.05	)		(0.05	)		(0.07	)		(0.08	)		(0.09	)
Net realized and unrealized gain (loss)		(0.07	)		4.62			(1.81	)		1.07			3.66			2.24
Net increase (decrease) from investment operations		(0.08	)		4.57			(1.86	)		1.00			3.58			2.15
Distributions:2
From net investment income		—			—			(0.04	)		—			(0.00	)3		—
From net realized gain		(3.79	)		(0.98	)		(2.55	)		(3.13	)		(1.30	)		—
Total distributions		(3.79	)		(0.98	)		(2.59	)		(3.13	)		(1.30	)		—
Net asset value, end of period	$	13.22		$	17.09		$	13.50		$	17.95		$	20.08		$	17.80
Total Return4
Based on net asset value		(0.66	)%5		33.97%			(11.71	)%		4.88%			20.26%			13.74%
Ratios to Average Net Assets
Total expenses		1.97%	6		1.95%			2.00%			1.99%	7		2.00%	7		2.16%
Total expenses after fees waived and/or reimbursed and/or paid indirectly		1.93%	6		1.95%			2.00%			1.99%	7		2.00%	7		2.16%
Net investment loss		(0.11)%	6		(0.31)%			(0.27)%			(0.33)%	7		(0.41)%	7		(0.55)%
Supplemental Data
Net assets, end of period (000)	$	30,288		$	56,247		$	47,178		$	68,488		$	72,312		$	61,756
Portfolio turnover rate		129%			93%			73%			65%			57%			55%

¹ Based on average shares outstanding.

² Distributions for annual periods determined in accordance with U.S. federal income tax regulations.

³ Amount is greater than $(0.005) per share.

⁴ Where applicable, excludes the effects of any sales charges and assumes the reinvestment of distributions.

⁵ Aggregate total return.

⁶ Annualized.

⁷ Ratios do not include expenses incurred indirectly as a result of investments in underlying funds of approximately 0.02% for the years ended January 31, 2015 and January 31, 2014.

See Notes to Financial Statements.
16	BLACKROCK MID CAP DIVIDEND FUND	JULY 31, 2017

Financial Highlights (concluded)

	Class R
	Six Months Ended July 31, 2017 (Unaudited)			Year Ended January 31,
				2017			2016			2015			2014			2013
Per Share Operating Performance
Net asset value, beginning of period	$	18.29		$	14.36		$	18.93		$	21.00		$	18.55		$	16.22
Net investment income (loss)1		0.04			0.03			0.04			0.04			0.02			(0.00	)2
Net realized and unrealized gain (loss)		(0.08	)		4.92			(1.93	)		1.12			3.83			2.33
Net increase (decrease) from investment operations		(0.04	)		4.95			(1.89	)		1.16			3.85			2.33
Distributions:3
From net investment income		—			(0.04	)		(0.12	)		(0.05	)		(0.04	)		—
From net realized gain		(3.81	)		(0.98	)		(2.56	)		(3.18	)		(1.36	)		—
Total distributions		(3.81	)		(1.02	)		(2.68	)		(3.23	)		(1.40	)		—
Net asset value, end of period	$	14.44		$	18.29		$	14.36		$	18.93		$	21.00		$	18.55
Total Return4
Based on net asset value		(0.39	)%5		34.58%			(11.26	)%		5.41%			20.88%			14.37%
Ratios to Average Net Assets
Total expenses		1.49%	6		1.48%			1.50%			1.49%	7		1.48%	7		1.59%
Total expenses after fees waived and/or reimbursed and/or paid indirectly		1.45%	6		1.48%			1.50%			1.49%	7		1.47%	7		1.59%
Net investment income		0.40%	6		0.16%			0.23%			0.17%	7		0.12%	7		0.01%
Supplemental Data
Net assets, end of period (000)	$	46,448		$	51,713		$	44,562		$	61,956		$	68,902		$	58,422
Portfolio turnover rate		129%			93%			73%			65%			57%			55%

¹ Based on average shares outstanding.

² Amount is greater than $(0.005) per share.

³ Distributions for annual periods determined in accordance with U.S. federal income tax regulations.

⁴ Where applicable, assumes the reinvestment of distributions.

⁵ Aggregate total return.

⁶ Annualized.

⁷ Ratios do not include expenses incurred indirectly as a result of investments in underlying funds of approximately 0.02% for the years ended January 31, 2015 and January 31, 2014.

See Notes to Financial Statements.
	BLACKROCK MID CAP DIVIDEND FUND	JULY 31, 2017	17

Notes to Financial Statements (Unaudited)

1. Organization:

BlackRock Mid Cap Dividend Series, Inc. (the “Corporation”) is registered under the Investment Company Act of 1940, as amended (the “1940 Act”), as an open-end management investment company. The Corporation is organized as a Maryland Corporation. BlackRock Mid Cap Dividend Fund (the “Fund”) is a series of the Corporation. The Fund is classified as diversified.

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 Shares are sold only to certain eligible investors. Class R Shares are available only to certain employer-sponsored retirement plans. 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.

Share Class	Initial Sales Charge	CDSC	Conversion Privilege
Institutional and Class R Shares	No	No	None
Investor A Shares	Yes	No1	None
Investor C Shares	No	Yes	None

¹ Investor A Shares may be subject to a CDSC for certain redemptions where no initial sales charge was paid at the time of purchase.

On June 12, 2017, the Board of Trustees of BlackRock Funds approved a name change from “BlackRock Mid Cap Value Opportunities Fund” to “BlackRock Mid Cap Dividend Fund.”

The Fund, together with certain other registered investment companies advised by BlackRock Advisors, LLC (the “Manager”) or its affiliates, are included in a complex of closed-end funds referred to as the Equity-Bond 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, investment transactions are recorded on the dates the transactions are entered into (the “trade dates”). Realized gains and losses on investment transactions are determined on the identified cost basis. Dividend income is recorded on the ex-dividend date. Dividends from foreign securities where the ex-dividend date may have passed are subsequently recorded when the Fund is informed of the ex-dividend date. Under the applicable foreign tax laws, a withholding tax at various rates may be imposed on capital gains, dividends and interest. Upon notification from issuers, some 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. 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 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. The Fund reports realized currency gains (losses) on foreign currency related transactions as components of net realized gain (loss) for financial reporting purposes, whereas such components are generally treated as ordinary income for U.S. federal income tax purposes.

Distributions: Distributions paid by the Fund are recorded on the ex-dividend date. Distributions from net investment income are declared and paid quarterly. The character and timing of distributions are determined in accordance with U.S. federal income tax regulations, which may differ from U.S. GAAP.

SEC Reporting Modernization: The U.S. Securities and Exchange Commission (“SEC”) adopted new rules and forms and amended other rules to enhance the reporting and disclosure of information by registered investment companies. As part of these changes, the SEC amended Regulation S-X to standardize and enhance disclosures in investment company financial statements. The compliance date for implementing the new or amended rules is August 1, 2017.

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.

18 BLACKROCK MID CAP DIVIDEND FUND JULY 31, 2017

Notes to Financial Statements (continued)

Other: Expenses directly related to the Fund or its classes are charged to the Fund or the applicable class. 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. 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.

Through May 31, 2016, the Fund had an arrangement with its custodian whereby credits were earned on uninvested cash balances, which could be used to reduce custody fees and/or overdraft charges. Credits previously earned have been utilized until December 31, 2016. Under current arrangements effective June 1, 2016, the Fund no longer earns credits on uninvested cash, and may incur charges on uninvested cash balances and overdrafts, subject to certain conditions.

3. Investment Valuation and Fair Value Measurements:

Investment Valuation Policies: The Fund’s investments are valued at fair value (also referred to as “market value” within the financial statements) as of the close of trading on the NYSE (generally 4:00 p.m., Eastern time). U.S. GAAP defines fair value as the price the 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 Fund determines the fair values of its financial instruments using various independent dealers or pricing services under policies approved by the Board of Directors of the Fund (the “Board”). The BlackRock Global Valuation Methodologies Committee (the “Global Valuation Committee”) is the committee formed by management to develop global pricing policies and procedures and to oversee the pricing function for all financial instruments.

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

• Equity investments traded on a recognized securities exchange are valued at the official closing price each day, if available. For equity investments traded on more than one exchange, the official closing price on the exchange where the stock is primarily traded is used. 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.

Generally, trading in foreign instruments is substantially completed each day at various times prior to the close of trading on the NYSE. Occasionally, events affecting the values of such instruments may occur between the foreign market close and the close of trading on the NYSE that may not be reflected in the computation of the Fund’s net assets. Each business day, the Fund uses a pricing service to assist with the valuation of certain foreign exchange-traded equity securities and foreign exchange-traded and over-the-counter (“OTC”) options (the “Systematic Fair Value Price”). Using current market factors, the Systematic Fair Value Price is designed to value such foreign securities and foreign options at fair value as of the close of trading on the NYSE, which follows the close of the local markets.

• Investments in open-end U.S. mutual funds are valued at net asset value (“NAV”) each business day.

• The Fund values its investment in SL Liquidity Series, LLC, Money Market Series (the “Money Market Series”) at fair value, which is ordinarily based upon its pro rata ownership in the underlying fund’s net assets. The Money Market Series seeks current income consistent with maintaining liquidity and preserving capital. Although the Money Market Series is not registered under the 1940 Act, its investments may follow the parameters of investments by a money market fund that is subject to Rule 2a-7 under the 1940 Act.

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

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

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

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

• Level 3 — Unobservable inputs based on the best information available in the circumstances, to the extent observable inputs are not available (including the Fund’s own assumptions used in determining the fair value of investments)

BLACKROCK MID CAP DIVIDEND FUND JULY 31, 2017 19

Notes to Financial Statements (continued)

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.

Changes in valuation techniques may result in transfers into or out of an assigned level within the hierarchy. In accordance with the Fund’s policy, transfers between different levels of the fair value hierarchy are deemed to have occurred as of the beginning of the reporting period. The categorization of a value determined for investments is based on the pricing transparency of the investments and is not necessarily an indication of the risks associated with investing in those securities.

As of July 31, 2017, certain investments of the Fund were valued using NAV as no quoted market value is available and therefore have been excluded from the fair value hierarchy.

4. Securities and Other Investments:

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

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

Securities lending transactions are entered into by the Fund 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 Fund, 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 Fund can reinvest cash collateral received in connection with loaned securities. Upon an event of default, the parties’ obligations to return the securities or collateral to the other party are extinguished, and the parties can resell or re-pledge the loaned securities or the collateral received in connection with the loaned securities in order to satisfy the defaulting party’s net payment obligation for all transactions under the MSLA. The defaulting party remains liable for any deficiency.

As of period end, the following table is a summary of the Fund’s securities lending agreements by counterparty which are subject to offset under an MSLA:

Counterparty	Securities Loaned at Value		Cash Collateral Received1			Net Amount
Citigroup Global Markets, Inc	$	2,744,786	$	(2,744,786	)		—
State Street Bank and Trust Co.		5,716,170		(5,716,170	)		—
Total	$	8,460,956	$	(8,460,956	)		—

¹  Cash collateral with a value of $8,680,920 has been received in connection with securities lending agreements. Collateral received in excess of the value of securities loaned from the individual counterparty is not shown for financial reporting purposes.

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 Fund benefits from a borrower default indemnity provided by BIM. BIM’s indemnity allows for full replacement of the securities loaned if the collateral received does not cover the value on the securities loaned in the event of borrower default. The Fund 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.

20 BLACKROCK MID CAP DIVIDEND FUND JULY 31, 2017

Notes to Financial Statements (continued)

5. Derivative Financial Instruments:

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

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

Futures contracts are agreements between the Fund 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 Fund 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.

Securities deposited as initial margin are designated in the Schedule of Investments and cash deposited, if any, is shown as cash pledged for futures contracts in the Statement of Assets and Liabilities. Pursuant to the contract, the Fund 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 value of the contract at the time it was opened and the value 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, foreign currency exchange rates or underlying assets.

6. Investment Advisory Agreement and Other Transactions with Affiliates:

The PNC Financial Services Group, Inc. is the largest stockholder and an affiliate of BlackRock, Inc. (“BlackRock”) for 1940 Act purposes.

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

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

Average Daily Net Assets	Investment Advisory Fee
First $1 Billion		0.65%
$1 Billion — $3 Billion		0.61%
$3 Billion — $5 Billion		0.59%
$5 Billion — $10 Billion		0.57%
Greater than $10 Billion		0.55%

Service and Distribution Fees: The Corporation, 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 Manager. 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:

	Investor A		Investor C		Class R
Distribution Fee		—		0.75%		0.25%
Service Fee		0.25%		0.25%		0.25%

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 six months ended July 31, 2017, the following table shows the class specific service and distribution fees borne directly by each share class of the Fund:

Investor A	Investor C	Class R	Total
$278,279	$227,084	$122,214	$	627,577

Transfer Agent: Pursuant to written agreements, certain financial intermediaries, some of which may be affiliates, provide the Fund with sub-accounting, recordkeeping, sub-transfer agency and other administrative services with respect to sub-accounts they service. For these services, these entities receive an

BLACKROCK MID CAP DIVIDEND FUND JULY 31, 2017 21

Notes to Financial Statements (continued)

asset-based fee or an annual fee per shareholder account, which will vary depending on share class and/or net assets. For the six months ended July 31, 2017, the Fund paid the following amounts to affiliates of BlackRock in return for these services, which are included in transfer agent — class specific in the Statement of Operations:

Institutional $ 75

The Manager maintains a call center that is responsible for providing certain shareholder services to the Fund. Shareholder services include responding to inquiries and processing subscriptions and redemptions based upon instructions from shareholders. For the six months ended July 31, 2017, the Fund reimbursed the Manager the following amounts for costs incurred in running the call center, which are included in transfer agent — class specific in the Statement of Operations:

Institutional	Investor A	Investor C	Class R		Total
$362	$3,706	$1,029	$	99	$	5,196

For the six months ended July 31, 2017, the following table shows the class specific transfer agent fees borne directly by each class of the Fund:

Institutional	Investor A	Investor C	Class R		Total
$127,508	$199,513	$52,289	$	61,200	$	440,510

Other Fees: For the six months ended July 31, 2017, affiliates earned underwriting discounts, direct commissions and dealer concessions on sales of Investor A Shares, which totaled $6,798.

For the six months ended July 31, 2017, affiliates received CDSCs as follows:

Investor A	1,166
Investor C	1,656

Expense Waivers, Reimbursements and Recoupments: With respect to the Fund, the Manager voluntarily agreed to waive its investment advisory fees by the amount of investment advisory fees the Fund pays to the Manager indirectly through its investment in affiliated money market funds (the “affiliated money market fund waiver”). The amount of waivers and/or reimbursements of fees and expenses made pursuant to the expense limitation caps, as applicable, will be reduced by the amount of the affiliated money market fund waiver. This amount is included in fees waived by the Manager in the Statement of Operations. For the six months ended July 31, 2017, the amounts waived were $1,366.

The Manager has voluntarily agreed to waive its investment advisory fee with respect to any portion of the Fund’s assets invested in affiliated equity and fixed-income mutual funds and affiliated exchange-traded funds that have a contractual management fee. Effective May 31, 2017, the waiver became contractual through May 31, 2018. The contractual agreement may be terminated upon 90 days’ notice by a majority of the independent directors who are not “interested persons” of the Fund, as defined in the 1940 Act (“Independent Directors”) of the Fund or by a vote of a majority of the outstanding voting securities of the Fund. For the six months ended July 31, 2017, the Fund did not waive any amount in investment advisory fees pursuant to these arrangements.

With respect to the Fund, effective June 12, 2017, the Manager contractually agreed to waive and/or reimburse fees or expenses in order to limit expenses, excluding interest expense, dividend expense, tax expense, acquired fund fees and expenses, and certain other fund expenses, which constitute extraordinary expenses not incurred in the ordinary course of the Fund’s business (“expense limitation”). The expense limitation as a percentage of average daily net assets is as follows:

Institutional	0.85%
Investor A	1.10%
Investor C	1.85%
Class R	1.35%

The Manager has agreed not to reduce or discontinue these contractual expense limitations through May 31, 2018, unless approved by the Board, including a majority of the independent trustees who are not “interested persons” of the Funds, as defined in the 1940 Act (“Independent Trustees”) or by a vote of a majority of the outstanding voting securities of the Funds.

These amounts waived and/or reimbursed are included in fees waived by the Manager and shown as transfer agent fees waived and/or reimbursed — class specific, respectively, in the Statements of Operations. Class specific expense waivers and/or reimbursements are as follows:

Institutional	Investor A	Investor C	Class R		Total
$14,408	$31,443	$9,353	$	10,824	$	66,028

For the six months ended July 31, 2017, the Fund reimbursed the Manager $2,798 for certain accounting services, which is included in accounting services in the Statement of Operations.

22 BLACKROCK MID CAP DIVIDEND FUND JULY 31, 2017

Notes to Financial Statements (continued)

With respect to the contractual expense caps, if during the Fund’s fiscal year the operating expenses of a share class, that at any time during the prior two fiscal years received a waiver and/or reimbursement from the Manager, are less than the expense cap for that share class, the Manager is entitled to be reimbursed by such share class up to the lesser of the following expenses:

(a) The amount of fees waived and/or expenses reimbursed during those prior two fiscal years under the agreement.

(b) The amount by which the expense cap for that share class exceeds the operating expenses of the share class for the current fiscal year, provided that:

• The Fund, of which the share class is a part, has more than $50 million in assets for the fiscal year; and

• The Manager or an affiliate continues to serve as the Fund’s investment adviser or administrator.

In the event the expense cap for a share class is changed subsequent to a fiscal year in which the Manager becomes entitled to reimbursement for fees waived and/or reimbursed, the amount available to reimburse the Manager shall be calculated by reference to the expense cap for that share class in effect at the time the Manager became entitled to receive such reimbursement, rather than the subsequently changed expense cap for that share class.

On July 31, 2017, the fund level and class specific waivers and/or reimbursements subject to possible future recoupment under the expense limitation agreement are as follows:

	Expiring January 31, 2020
Fund Level		—
Institutional	$	14,408
Investor A	$	31,443
Investor C	$	9,353
Class R	$	10,824

Securities Lending: The SEC has issued an exemptive order which permits BIM, an affiliate of the Manager, to serve as securities lending agent for the Fund, subject to applicable conditions. As securities lending agent, BIM bears all operational costs directly related to securities lending. The Fund is responsible for expenses in connection with the investment of cash collateral received for securities on loan (the “collateral investment expenses”). The cash collateral is invested in a private investment company managed by the Manager or its affiliates. However, BIM has agreed to cap the collateral investment expenses of the private investment company to an annual rate of 0.04%. The investment adviser to the private investment company will not charge any advisory fees with respect to shares purchased by the Fund. The private investment company in which the cash collateral has been invested may, under certain circumstances, impose a liquidity fee of up to 2% on the value redeemed or temporarily restrict redemptions for up to 10 business days during a 90 day period, in the event that the private investment company’s weekly liquid assets fall below certain thresholds.

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

Pursuant to a securities lending agreement, the Fund retains 71.5% of securities lending income, and this amount retained can never be less than 65% of the total of securities lending income plus the collateral investment expenses.

In addition, commencing the business day following the date that the aggregate securities lending income earned across the Equity-Bond Complex in a calendar year exceeds a specified threshold, the Fund, pursuant to the securities lending agreement, will retain for the remainder of that calendar year securities lending income as follows: 75% of securities lending income, and this amount retained can never be less than 65% of the total of securities lending income plus the collateral investment expenses.

The share of securities lending income earned by the Fund is shown as securities lending income — affiliated — net in the Statement of Operations. For the six months ended July 31, 2017, the Fund paid BIM $38,582 for securities lending agent services.

Interfund Lending: In accordance with an exemptive order (the “Order”) from the 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

BLACKROCK MID CAP DIVIDEND FUND JULY 31, 2017 23

Notes to Financial Statements (continued)

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 period ended July 31, 2017, the Fund did not participate in the Interfund Lending Program.

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

Other Transactions: The Fund may purchase securities from, or sell securities to, an affiliated fund provided the affiliation is due solely to having a common investment adviser, common officers, or common directors. For the six months ended July 31, 2017, the purchase and sale transactions and any net realized gains (losses) with an affiliated fund in compliance with Rule 17a-7 under the 1940 Act were as follows:

Purchases	Sales	Net Realized Gain
$115,997,612	$36,469,638	$3,910,126

7. Purchases and Sales:

For the six months ended July 31, 2017, purchases and sales of investments, were $660,480,974 and $761,722,427, respectively.

8. 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 each of the four years ended January 31, 2017. 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 July 31, 2017, 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.

As of July 31, 2017, gross unrealized appreciation and depreciation based on cost for U.S. federal income tax purposes were as follows:

Tax cost	$	462,522,240
Gross unrealized appreciation		12,051,955
Gross unrealized depreciation		(14,765,540	)
Net unrealized depreciation	$	(2,713,585	)

9. Bank Borrowings:

The Corporation, on behalf of the Fund, along with certain other funds managed by the Manager and its affiliates (“Participating Funds”), is a party to a 364-day, $2.1 billion credit agreement with a group of lenders. Under this agreement, the Fund may borrow to fund shareholder redemptions. Excluding commitments designated for certain individual funds, the Participating Funds, including the Fund, can borrow up to an aggregate commitment amount of $1.6 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 0.12% per annum on unused commitment amounts and interest at a rate equal to the higher of (a) one-month LIBOR (but, in any event, not less than 0.00%) on the date the loan is made plus 0.80% per annum or (b) the Fed Funds rate (but, in any event, not less than 0.00%) in effect from time to time plus 0.80% per annum on amounts borrowed. The agreement expires in April 2018 unless extended or renewed. Participating Funds paid administration, legal and arrangement fees, which, if applicable, are included in miscellaneous expenses in the Statement of Operations. 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 six months ended July 31, 2017, the Fund did not borrow under the credit agreement.

10. Principal Risks:

In the normal course of business, the Fund invests in securities and enters into transactions where risks exist due to fluctuations in the market (market risk) or failure of the issuer to meet all its obligations, including the ability to pay principal and interest when due (issuer credit risk). The value of securities may also be affected by one or all of the following: (i) general economy; (ii) overall market as well as local, regional or global political and/or social instability; (iii) regulation, taxation or international tax treaties between various countries; and (iv) currency, interest rate and price fluctuations.

On October 11, 2016, BlackRock implemented certain changes required by amendments to Rule 2a-7 under the 1940 Act, which governs the operations of U.S. money market funds. The Fund 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 and which may be subject to redemption gates or liquidity fees under certain circumstances.

24 BLACKROCK MID CAP DIVIDEND FUND JULY 31, 2017

Notes to Financial Statements (concluded)

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 Fund may invest in illiquid investments and may experience difficulty in selling those 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 Fund’s NAV to experience significant increases or decreases over short periods of time. If there is a general decline in the securities and other markets, the NAV of the Fund may lose value, regardless of the individual results of the securities and other instruments in which the Fund invests.

Counterparty Credit Risk: Similar to issuer credit risk, the Fund 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. The Fund 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 Fund to market, issuer and counterparty credit risks, consist principally of financial instruments and receivables due from counterparties. The extent of the Fund’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 Fund.

11. Capital Share Transactions:

Transactions in capital shares for each class were as follows:

	Six Months Ended July  31, 2017						Year Ended January 31, 2017
	Shares			Amount			Shares			Amount
Institutional
Shares sold		1,329,997		$	27,817,268			5,246,870		$	96,327,801
Shares issued in reinvestment of distributions		1,321,745			23,209,852			305,857			6,410,771
Shares redeemed		(3,378,347	)		(70,239,183	)		(4,511,165	)		(85,093,707	)
Net decrease		(726,605	)	$	(19,212,063	)		1,041,562		$	17,644,865
Investor A
Shares sold		1,762,548		$	35,415,498			2,558,168		$	49,381,173
Shares issued in reinvestment of distributions		2,367,734			39,659,525			551,751			11,145,215
Shares redeemed		(2,622,315	)		(52,364,474	)		(3,957,325	)		(74,170,963	)
Net decrease		1,507,967		$	22,710,549			(847,406	)	$	(13,644,575	)
Class C
Shares sold		176,333		$	2,993,935			575,662		$	9,387,267
Shares issued in reinvestment of distributions		506,005			6,745,040			167,317			2,825,975
Shares redeemed		(1,683,218	)		(28,072,724	)		(946,428	)		(14,890,658	)
Net increase (decrease)		(1,000,880	)	$	(18,333,749	)		(203,449	)	$	(2,677,416	)
Investor R
Shares sold		329,723		$	5,971,546			746,026		$	12,611,434
Shares issued in reinvestment of distributions		673,632			9,801,352			153,567			2,774,948
Shares redeemed		(614,042	)		(11,002,866	)		(1,175,737	)		(19,826,669	)
Net decrease		389,313		$	4,770,032			(276,144	)	$	(4,440,287	)
Total Net Decrease		169,795		$	(10,065,231	)		(285,437	)	$	(3,117,413	)

12. 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.

25 BLACKROCK MID CAP DIVIDEND FUND JULY 31, 2017

Disclosure of Investment Advisory Agreement

The Board of Directors (the “Board,” the members of which are referred to as “Board Members”) of BlackRock Mid Cap Dividend Series, Inc. (the “Company”) met in person on April 6, 2017 (the “April Meeting”) and May 9-10, 2017 (the “May Meeting”) to consider the approval of the investment advisory agreement (the “Advisory Agreement” or the “Agreement”) between the Company, on behalf of BlackRock Mid Cap Dividend Fund (the “Fund”), and BlackRock Advisors, LLC (the “Manager” or “BlackRock”), the Fund’s investment advisor.

Activities and Composition of the Board

On the date of the May Meeting, the Board consisted of thirteen individuals, eleven of whom were not “interested persons” of the Company as defined in the Investment Company Act of 1940, as amended (the “1940 Act”) (the “Independent Board Members”). The Board Members are responsible for the oversight of the operations of the Fund and perform the various duties imposed on the directors of investment companies by the 1940 Act. The Independent Board Members have retained independent legal counsel to assist them in connection with their duties. The Chair of the Board is an Independent Board Member. The Board has established five standing committees: an Audit Committee, a Governance and Nominating Committee, a Compliance Committee, a Performance Oversight Committee and an Executive Committee, each of which is chaired by an Independent Board Member and composed of Independent Board Members (except for the Performance Oversight Committee and the Executive Committee, each of which also has one interested Board Member).

The Agreement

Pursuant to the 1940 Act, the Board is required to consider the continuation of the Agreement on an annual basis. The Board has four quarterly meetings per year, each extending over two days, a fifth one-day meeting to consider specific information surrounding the consideration of renewing the Agreement and additional in-person and telephonic meetings as needed. In connection with this year-long deliberative process, the Board assessed, among other things, the nature, extent and quality of the services provided to the Fund by BlackRock, BlackRock’s personnel and affiliates, including (as applicable): investment management; administrative and shareholder services; the oversight of fund service providers; marketing; risk oversight; compliance; and ability to meet applicable legal and regulatory requirements.

The Board, acting directly and through its committees, considers at each of its meetings, and from time to time as appropriate, factors that are relevant to its annual consideration of the renewal of the Agreement, including the services and support provided by BlackRock to the Fund and its shareholders. BlackRock also furnished additional information to the Board in response to specific questions from the Board. This additional information is discussed further below in the section titled “Board Considerations in Approving the Agreement.” Among the matters the Board considered were: (a) investment performance for one-year, three-year, five-year, ten-year, and/or since inception periods, as applicable, against peer funds, applicable benchmark, and performance metrics, as applicable, as well as senior management’s and portfolio managers’ analysis of the reasons for any over-performance or underperformance relative to its peers, benchmarks, and other performance metrics, as applicable; (b) fees, including advisory, administration, if applicable, and other amounts paid to BlackRock and its affiliates by the Fund for services; (c) Fund operating expenses and how BlackRock allocates expenses to the Fund; (d) the resources devoted to, risk oversight of, and compliance reports relating to, implementation of the Fund’s investment objective(s), policies and restrictions, and meeting regulatory requirements; (e) the Fund’s adherence to its compliance policies and procedures; (f) the nature, cost and character of non-investment management services provided by BlackRock and its affiliates; (g) BlackRock’s and other service providers’ internal controls and risk and compliance oversight mechanisms; (h) BlackRock’s implementation of the proxy voting policies approved by the Board; (i) the use of brokerage commissions and execution quality of portfolio transactions; (j) BlackRock’s implementation of the Fund’s valuation and liquidity procedures; (k) an analysis of management fees for products with similar investment mandates across the open-end fund, exchange-traded fund (“ETF”), closed-end fund, sub-advised mutual fund, separately managed account, collective investment trust, and institutional separate account product channels, as applicable, and the similarities and differences between these products and the services provided as compared to the Fund; (l) BlackRock’s compensation methodology for its investment professionals and the incentives and accountability it creates, along with investment professionals’ investments in the fund(s) they manage; and (m) periodic updates on BlackRock’s business.

Board Considerations in Approving the Agreement

The Approval Process: Prior to the April Meeting, the Board requested and received materials specifically relating to the Agreement. The Board is continuously engaged in a process with its independent legal counsel and BlackRock to review the nature and scope of the information provided to better assist its deliberations. The materials provided in connection with the April Meeting included (a) information independently compiled and prepared by Broadridge Financial Solutions, Inc. (“Broadridge”) on Fund fees and expenses as compared with a peer group of funds as determined by Broadridge (“Expense Peers”) and the investment performance of the Fund as compared with a peer group of funds as determined by Broadridge¹ and the Morningstar Classification; (b) information on the profits realized by BlackRock and its affiliates pursuant to the Agreement and a discussion of fall-out benefits to BlackRock and its affiliates; (c) a general analysis provided by BlackRock concerning investment management fees charged to other clients, such as institutional clients, sub-advised mutual funds, ETFs, closed-end funds, and separately managed accounts, under similar investment mandates, as well as the performance of such other clients, as applicable; (d) review of non-management fees; (e) the existence, impact and sharing of potential economies of scale; (f) a summary of aggregate amounts paid by the Fund to BlackRock; and (g) sales and redemption data regarding the Fund’s shares.

¹  Funds are ranked by Broadridge in quartiles, ranging from first to fourth, where first is the most desirable quartile position and fourth is the least desirable.

26 BLACKROCK MID CAP DIVIDEND FUND JULY 31, 2017

Disclosure of Investment Advisory Agreement (continued)

At the April Meeting, the Board reviewed materials relating to its consideration of the Agreement. As a result of the discussions that occurred during the April Meeting, and as a culmination of the Board’s year-long deliberative process, the Board presented BlackRock with questions and requests for additional information. BlackRock responded to these requests with additional written information in advance of the May Meeting.

At the May Meeting, the Board, including the Independent Board Members, approved the continuation of the Advisory Agreement between the Manager and the Fund for a one-year term ending June 30, 2018. In approving the continuation of the Agreement, the Board considered: (a) the nature, extent and quality of the services provided by BlackRock; (b) the investment performance of the Fund; (c) the advisory fee and the cost of the services and profits to be realized by BlackRock and its affiliates from their relationship with the Fund; (d) the Fund’s costs to investors compared to the costs of Expense Peers and performance compared to the relevant performance metrics as previously discussed; (e) the sharing of potential economies of scale; (f) fall-out benefits to BlackRock and its affiliates as a result of its relationship with the Fund; and (g) other factors deemed relevant by the Board Members.

The Board also considered other matters it deemed important to the approval process, such as other payments made to BlackRock or its affiliates, securities lending and cash management, services related to the valuation and pricing of Fund portfolio holdings, and materials submitted for the Board’s review. The Board noted the willingness of BlackRock personnel to engage in open, candid discussions with the Board. The Board did not identify any particular information as determinative, and each Board Member may have attributed different weights to the various items considered.

A. Nature, Extent and Quality of the Services Provided by BlackRock: The Board, including the Independent Board Members, reviewed the nature, extent and quality of services provided by BlackRock, including the investment advisory services and the resulting performance of the Fund. Throughout the year, the Board compared Fund performance to the performance of a comparable group of mutual funds, a relevant benchmark, and performance metrics, as applicable. The Board met with BlackRock’s senior management personnel responsible for investment activities, including the senior investment officers. The Board also reviewed the materials provided by the Fund’s portfolio management team discussing the Fund’s performance and the Fund’s investment objective(s), strategies and outlook.

The Board considered, among other factors, with respect to BlackRock: the number, education and experience of investment personnel generally and the Fund’s portfolio management team; BlackRock’s research capabilities; investments by portfolio managers in the funds they manage; portfolio trading capabilities; use of technology; commitment to compliance; credit analysis capabilities; risk analysis and oversight capabilities; and the approach to training and retaining portfolio managers and other research, advisory and management personnel. The Board engaged in a review of BlackRock’s compensation structure with respect to the Fund’s portfolio management team and BlackRock’s ability to attract and retain high-quality talent and create performance incentives.

In addition to investment advisory services, the Board considered the quality of the administrative and other non-investment advisory services provided to the Fund. BlackRock and its affiliates provide the Fund with certain administrative, shareholder and other services (in addition to any such services provided to the Fund by third parties) and officers and other personnel as are necessary for the operations of the Fund. In particular, BlackRock and its affiliates provide the Fund with administrative services including, among others: (i) preparing disclosure documents, such as the prospectus, the summary prospectus (as applicable), the statement of additional information and periodic shareholder reports; (ii) oversight of daily accounting and pricing; (iii) preparing periodic filings with regulators; (iv) overseeing and coordinating the activities of other service providers; (v) organizing Board meetings and preparing the materials for such Board meetings; (vi) providing legal and compliance support; (vii) furnishing analytical and other support to assist the Board in its consideration of strategic issues such as the merger, consolidation or repurposing of certain open-end funds; and (viii) performing other administrative functions necessary for the operation of the Fund, such as tax reporting, fulfilling regulatory filing requirements and call center services. The Board reviewed the structure and duties of BlackRock’s fund administration, shareholder services, and legal & compliance departments and considered BlackRock’s policies and procedures for assuring compliance with applicable laws and regulations.

B. The Investment Performance of the Fund and BlackRock: The Board, including the Independent Board Members, also reviewed and considered the performance history of the Fund. In preparation for the April Meeting, the Board was provided with reports independently prepared by Broadridge, which included a comprehensive analysis of the Fund’s performance. The Board also reviewed a narrative and statistical analysis of the Broadridge data that was prepared by BlackRock. In connection with its review, the Board received and reviewed information regarding the investment performance of the Fund as compared to other funds in its applicable Broadridge category and the Morningstar Classification. The Board was provided with a description of the methodology used by Broadridge to select peer funds and periodically meets with Broadridge representatives to review its methodology. The Board was provided with information on the composition of the Broadridge performance universes and expense universes. The Board and its Performance Oversight Committee regularly review, and meet with Fund management to discuss, the performance of the Fund throughout the year.

In evaluating performance, the Board recognized that the performance data reflects a snapshot of a period as of a particular date and that selecting a different performance period could produce significantly different results. Further, the Board recognized that it is possible that long-term performance can be adversely affected by even one period of significant underperformance so that a single investment decision or theme has the ability to affect long-term performance disproportionately.

BLACKROCK MID CAP DIVIDEND FUND JULY 31, 2017 27

Disclosure of Investment Advisory Agreement (continued)

The Board noted that for the one-, three- and five-year periods reported, the Fund ranked in the first, third and fourth quartiles, respectively, against its Morningstar Performance Universe. BlackRock believes that the Morningstar Performance Universe is an appropriate performance metric for the Fund. The Board and BlackRock reviewed the Fund’s underperformance during the three- and five-year periods. The Board noted that effective June 12, 2017, the Fund had undergone changes in its investment strategy and portfolio management team, and in connection with such changes, the Fund changed its name from BlackRock Mid Cap Value Opportunities Fund to BlackRock Mid Cap Dividend Fund.

C. Consideration of the Advisory/Management Fees and the Cost of the Services and Profits to be Realized by BlackRock and its Affiliates from their Relationship with the Fund: The Board, including the Independent Board Members, reviewed the Fund’s contractual management fee rate compared with the other funds in its Broadridge category. The contractual management fee rate represents a combination of the advisory fee and any administrative fees, before taking into account any reimbursements or fee waivers. The Board also compared the Fund’s total expense ratio, as well as its actual management fee rate, to those of other funds in its Broadridge category. The total expense ratio represents a fund’s total net operating expenses, including any 12b-1 or non 12b-1 service fees. The total expense ratio gives effect to any expense reimbursements or fee waivers that benefit a fund, and the actual management fee rate gives effect to any management fee reimbursements or waivers that benefit a fund. The Board considered the services provided and the fees charged by BlackRock and its affiliates to other types of clients with similar investment mandates, as applicable, including institutional accounts and sub-advised mutual funds (including mutual funds sponsored by third parties).

The Board received and reviewed statements relating to BlackRock’s financial condition. The Board reviewed BlackRock’s profitability methodology and was also provided with a profitability analysis that detailed the revenues earned and the expenses incurred by BlackRock for services provided to the Fund. The Board reviewed BlackRock’s profitability with respect to the Fund and other funds the Board currently oversees for the year ended December 31, 2016 compared to available aggregate profitability data provided for the prior two years. The Board reviewed BlackRock’s profitability with respect to certain other U.S. fund complexes managed by the Manager and/or its affiliates. The Board reviewed BlackRock’s assumptions and methodology of allocating expenses in the profitability analysis, noting the inherent limitations in allocating costs among various advisory products. The Board recognized that profitability may be affected by numerous factors including, among other things, fee waivers and expense reimbursements by the Manager, the types of funds managed, precision of expense allocations and business mix. As a result, calculating and comparing profitability at individual fund levels is difficult.

The Board noted that, in general, individual fund or product line profitability of other advisors is not publicly available. The Board reviewed BlackRock’s overall operating margin, in general, compared to that of certain other publicly-traded asset management firms. The Board considered the differences between BlackRock and these other firms, including the contribution of technology at BlackRock, BlackRock’s expense management, and the relative product mix.

In addition, the Board considered the cost of the services provided to the Fund by BlackRock, and BlackRock’s and its affiliates’ profits relating to the management and distribution of the Fund and the other funds advised by BlackRock and its affiliates. As part of its analysis, the Board reviewed BlackRock’s methodology in allocating its costs of managing the Fund, to the Fund. The Board may receive and review information from independent third parties as part of its annual evaluation. The Board considered whether BlackRock has the financial resources necessary to attract and retain high quality investment management personnel to perform its obligations under the Agreement and to continue to provide the high quality of services that is expected by the Board. The Board further considered factors including but not limited to BlackRock’s commitment of time, assumption of risk, and liability profile in servicing the Fund in contrast to what is required of BlackRock with respect to other products with similar investment mandates across the open-end fund, ETF, closed-end fund, sub-advised mutual fund, separately managed account, collective investment trust, and institutional separate account product channels, as applicable.

The Board noted that the Fund’s contractual management fee rate ranked in the second quartile, and that the actual management fee rate and total expense ratio ranked in the second and third quartiles, respectively, relative to the Fund’s Expense Peers. The Board also noted that the Fund has an advisory fee arrangement that includes breakpoints that adjust the fee rate downward as the size of the Fund increases above certain contractually specified levels. In addition, the Board noted that, in connection with the changes to the Fund’s investment strategy, BlackRock proposed, and the Board agreed to, a contractual expense cap on the Fund’s total expenses as a percentage of the Fund’s average daily net assets on a class-by-class basis. This contractual expense cap was implemented on June 12, 2017. The Board also noted that based on a pro-forma Broadridge expense group chosen for the new investment strategy of the Fund, and under the new contractual expense cap, the Fund’s estimated total expense ratio is expected to rank in the first quartile.

D. Economies of Scale: The Board, including the Independent Board Members, considered the extent to which economies of scale might be realized as the assets of the Fund increase, as well as the existence of expense caps, as applicable. The Board also considered the extent to which the Fund benefits from such economies in a variety of ways, and whether there should be changes in the advisory fee rate or breakpoint structure in order to enable the Fund to more fully participate in these economies of scale. The Board considered the Fund’s asset levels and whether the current fee schedule was appropriate. In its consideration, the Board Members took into account the existence of any expense caps and further considered the continuation and/or implementation, as applicable, of such caps.

E. Other Factors Deemed Relevant by the Board Members: The Board, including the Independent Board Members, also took into account other ancillary or “fall-out” benefits that BlackRock or its affiliates may derive from their respective relationships with the Fund, both tangible and intangible, such as

28 BLACKROCK MID CAP DIVIDEND FUND JULY 31, 2017

Disclosure of Investment Advisory Agreement (concluded)

BlackRock’s ability to leverage its investment professionals who manage other portfolios and risk management personnel, an increase in BlackRock’s profile in the investment advisory community, and the engagement of BlackRock’s affiliates as service providers to the Fund, including for administrative, distribution, securities lending and cash management services. The Board also considered BlackRock’s overall operations and its efforts to expand the scale of, and improve the quality of, its operations. The Board also noted that BlackRock may use and benefit from third party research obtained by soft dollars generated by certain registered fund transactions to assist in managing all or a number of its other client accounts.

In connection with its consideration of the Agreement, the Board also received information regarding BlackRock’s brokerage and soft dollar practices. The Board received reports from BlackRock which included information on brokerage commissions and trade execution practices throughout the year.

The Board noted the competitive nature of the open-end fund marketplace, and that shareholders are able to redeem their Fund shares if they believe that the Fund’s fees and expenses are too high or if they are dissatisfied with the performance of the Fund.

Conclusion

The Board, including the Independent Board Members, approved the continuation of the Advisory Agreement between the Manager and the Company, on behalf of the Fund, for a one-year term ending June 30, 2018. Based upon its evaluation of all of the aforementioned factors in their totality, as well as other information, the Board, including the Independent Board Members, was satisfied that the terms of the Agreement were fair and reasonable and in the best interest of the Fund and its shareholders. In arriving at its decision to approve the Agreement, the Board did not identify any single factor or group of factors as all-important or controlling, but considered all factors together, and different Board Members may have attributed different weights to the various factors considered. The Independent Board Members were also assisted by the advice of independent legal counsel in making this determination. The contractual fee arrangements for the Fund reflect the results of several years of review by the Board Members and predecessor Board Members, and discussions between such Board Members (and predecessor Board Members) and BlackRock. As a result, the Board Members’ conclusions may be based in part on their consideration of these arrangements in prior years.

BLACKROCK MID CAP DIVIDEND FUND JULY 31, 2017 29

Officers and Directors

Robert M. Hernandez, Chair of the Board and Director

James H. Bodurtha, Director

Bruce R. Bond, Director

Donald W. Burton, Director

Honorable Stuart E. Eizenstat, Director

Henry Gabbay, Director

Lena G. Goldberg, Director

Henry R. Keizer, Director

John F. O’Brien, Director

Donald C. Opatrny, Director

Roberta Cooper Ramo, Director

Robert Fairbairn, Director

John M. Perlowski, Director, President and Chief Executive Officer

Jennifer McGovern, Vice President

Neal J. Andrews, Chief Financial Officer

Jay M. Fife, Treasurer

Charles Park, Chief Compliance Officer

Fernanda Piedra, Anti-Money Laundering Compliance Officer

Benjamin Archibald, Secretary

Investment Adviser BlackRock Advisors, LLC Wilmington, DE 19809	Custodian and Accounting Agent State Street Bank and Trust Company Boston, MA 02111	Distributor BlackRock Investments, LLC New York, NY 10022	Legal Counsel Willkie Farr & Gallagher LLP New York, NY 10019	Address of the Corporation 100 Bellevue Parkway Wilmington, DE 19809
	Transfer Agent BNY Mellon Investment Servicing (US) Inc. Wilmington, DE 19809	Independent Registered Public Accounting Firm Deloitte & Touche LLP Philadelphia, PA 19103

Additional Information

General Information

Householding

The Fund will mail only one copy of shareholder documents, including prospectuses, annual and semi-annual reports 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 files its complete schedule of portfolio holdings with the SEC for the first and third quarters of each fiscal year on Form N-Q. The Fund’s Forms N-Q are available on the SEC’s website at http://www.sec.gov and may also be reviewed and copied at the SEC’s Public Reference Room in Washington, D.C. Information on the operation of the Public Reference Room or how to access documents on the SEC’s website without charge may be obtained by calling (800) SEC-0330. The Fund’s Forms N-Q may also be obtained upon request and without charge by calling (800) 441-7762.

Availability of Proxy Voting Policies and Procedures

A description of the policies and procedures that the Fund uses to determine how to vote proxies relating to portfolio securities is available upon request and without charge (1) by calling (800) 441-7762; (2) at http://www.blackrock.com; and (3) on the SEC’s website at http://www.sec.gov.

30 BLACKROCK MID CAP DIVIDEND FUND JULY 31, 2017

Additional Information (concluded)

General Information (concluded)

Availability of Proxy Voting Record

Information about how the Fund voted proxies relating to securities held in the Fund’s portfolio during the most recent 12-month period ended June 30 is available upon request and without charge (1) at http://www.blackrock.com; or by calling (800) 441-7762 and (2) on the SEC’s website at http://www.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 http://www.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 reach us on the Web at http://www.blackrock.com/funds.

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.

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.

BLACKROCK MID CAP DIVIDEND FUND JULY 31, 2017 31

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.

MIDCAPVAL-7/17-SAR

Item 2 –	Code of Ethics – During the period covered by this report, the code of ethics was amended to clarify an inconsistency in to whom persons covered by the code should report suspected violations of the code. The amendment clarifies that such reporting should be made to BlackRock’s General Counsel, and retains the alternative option of anonymous reporting following “whistleblower” policies. Other non-material changes were also made in connection with this amendment. The registrant undertakes to provide a copy of the code of ethics to any person upon request, without charge, by calling 1-800-441-7762.
Item 3 –	Audit Committee Financial Expert – Not Applicable to this semi-annual report
Item 4 –	Principal Accountant Fees and Services – Not Applicable to this semi-annual report
Item 5 –	Audit Committee of Listed Registrants – Not Applicable
Item 6 –	Investments
	(a) The registrant’s Schedule of Investments is included as part of the Report to Stockholders filed under Item 1 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 registrant’s principal executive and principal financial officers, or persons performing similar functions, have concluded that the registrant’s 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 registrant’s internal control over financial reporting (as defined in Rule 30a-3(d) under the 1940 Act) that occurred during the second fiscal quarter of the period covered by this report that have materially affected, or are reasonably likely to materially affect, the registrant’s internal control over financial reporting.
Item 12 –	Exhibits attached hereto
	(a)(1) – Code of Ethics – Not Applicable to this semi-annual report
	(a)(2) – Certifications – Attached hereto
	(a)(3) – Not Applicable

2

(b) – Certifications – Attached hereto

3

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

 BlackRock Mid Cap Dividend Fund of BlackRock Mid Cap Dividend Series, Inc. (Formerly BlackRock Mid Cap  Value Opportunities Fund of BlackRock Mid Cap Value Opportunities Series, Inc.)

By:	/s/ John M. Perlowski
	John M. Perlowski
	Chief Executive Officer (principal executive officer) of
	BlackRock Mid Cap Dividend Fund of BlackRock Mid Cap Dividend Series, Inc.
	(Formerly BlackRock Mid Cap Value Opportunities Fund of BlackRock Mid Cap Value Opportunities Series, Inc.)
Date:	October 4, 2017

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 the 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 Mid Cap Dividend Fund of BlackRock Mid Cap Dividend Series, Inc.
	(Formerly BlackRock Mid Cap Value Opportunities Fund of BlackRock Mid Cap Value Opportunities Series, Inc.)
Date:	October 4, 2017

By:	/s/ Neal J. Andrews
	Neal J. Andrews
	Chief Financial Officer (principal financial officer) of
	BlackRock Mid Cap Dividend Fund of BlackRock Mid Cap Dividend Series, Inc.
	(Formerly BlackRock Mid Cap Value Opportunities Fund of BlackRock Mid Cap Value Opportunities Series, Inc.)
Date:	October 4, 2017

4