Exhibit 1(o)

BLACKROCK LARGE CAP SERIES FUNDS, INC.

ARTICLES SUPPLEMENTARY

BLACKROCK LARGE CAP SERIES FUNDS, INC., a Maryland corporation (the “Corporation”), hereby certifies to the State Department of Assessments and Taxation of the State of Maryland that:

FIRST: The Corporation is registered as an open-ended company under the Investment Company Act of 1940, as amended, with the authority to issue Eleven Billion Six Hundred Fifty Million (11,650,000,000) shares of capital stock as follows:

Series and Classes	Number of Authorized Shares
BlackRock Advantage Large Cap Core Fund
Institutional Common Stock		400,000,000
Investor A Common Stock		300,000,000
Investor C Common Stock		400,000,000
Class R Common Stock		200,000,000
Service Common Stock		50,000,000
Class K Common Stock		2,000,000,000
BlackRock Large Cap Focus Growth Fund
Institutional Common Stock		100,000,000
Investor A Common Stock		100,000,000
Investor C Common Stock		100,000,000
Class R Common Stock		200,000,000
Service Common Stock		50,000,000
Class K Common Stock		2,000,000,000
BlackRock Advantage Large Cap Value Fund
Institutional Common Stock		400,000,000
Investor A Common Stock		400,000,000
Investor C Common Stock		400,000,000
Class R Common Stock		200,000,000
Service Common Stock		50,000,000
Class K Common Stock		2,000,000,000
BlackRock Event Driven Equity Fund
Institutional Common Stock		400,000,000
Investor A Common Stock		300,000,000
Investor C Common Stock		400,000,000
Total:		10,450,000,000

The remainder of the authorized capital stock of the Corporation, One Billion Two Hundred Million (1,200,000,000) shares, is not designated or classified as to any class or series. All shares of capital stock of the Corporation have a par value of Ten Cents ($0.10) per share and an aggregate par value of One Billion One Hundred Sixty-Five Million Dollars ($1,165,000,000).

SECOND: Pursuant to authority expressly vested in the Board of Directors of the Corporation by Section 2-105(c) of the Maryland General Corporation Law and the Corporation’s charter, the Board of Directors hereby classifies Two Hundred Million (200,000,000) authorized but unissued shares of the Corporation’s common stock, without designation as to class or series, as Institutional Common Stock of BlackRock Event Driven Equity Fund.

THIRD: After the classification of authorized but unissued shares of capital stock of the Corporation as set forth herein, the Corporation will have the authority to issue Eleven Billion Six Hundred Fifty Million (11,650,000,000) shares of capital stock as follows:

Series and Classes	Number of Authorized Shares
BlackRock Advantage Large Cap Core Fund
Institutional Common Stock		400,000,000
Investor A Common Stock		300,000,000
Investor C Common Stock		400,000,000
Class R Common Stock		200,000,000
Service Common Stock		50,000,000
Class K Common Stock		2,000,000,000
BlackRock Large Cap Focus Growth Fund
Institutional Common Stock		100,000,000
Investor A Common Stock		100,000,000
Investor C Common Stock		100,000,000
Class R Common Stock		200,000,000
Service Common Stock		50,000,000
Class K Common Stock		2,000,000,000
BlackRock Advantage Large Cap Value Fund
Institutional Common Stock		400,000,000
Investor A Common Stock		400,000,000
Investor C Common Stock		400,000,000
Class R Common Stock		200,000,000
Service Common Stock		50,000,000
Class K Common Stock		2,000,000,000
BlackRock Event Driven Equity Fund
Institutional Common Stock		600,000,000
Investor A Common Stock		300,000,000
Investor C Common Stock		400,000,000
Total:		10,650,000,000

The remainder of the authorized capital stock of the Corporation, One Billion (1,000,000,000) shares, is not designated or classified as to any class or series. All shares of capital stock of the Corporation will have a par value of Ten Cents ($0.10) per share and an aggregate par value of One Billion One Hundred Sixty-Five Million Dollars ($1,165,000,000).

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FOURTH: All of the shares of the Corporation’s capital stock continue to have the same preferences, conversion and other rights, voting powers, restrictions, limitations as to dividends, qualifications, and terms and conditions of redemption as currently set forth in the Corporation’s charter.

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IN WITNESS WHEREOF, BLACKROCK LARGE CAP SERIES FUNDS, INC. has caused these Articles Supplementary to be signed in its name and on its behalf by the person named below who acknowledges that these Articles Supplementary are the act of the Corporation and that, as to all matters and facts required to be verified under oath and to the best of his knowledge, information and belief under the penalties of perjury, the matters and facts set forth herein are true in all material respects, as of this 25th day of September 2019.

ATTEST:	BLACKROCK LARGE CAP SERIES FUNDS, INC.
/s/ Janey Ahn	By:	/s/ John M. Perlowski
Janey Ahn		John M. Perlowski
Secretary		President and Chief Executive Officer

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