Definitive Materials Filed by Investment Companies. (497)

787 Seventh Avenue

New York, NY 10019-6099

Tel: 212 728 8000

Fax: 212 728 8111

September 12, 2013

VIA EDGAR

Securities and Exchange Commission

100 F Street, NE

Washington, DC 20549

Re: Global SmallCap Portfolio, a series of Managed Account Series

(File No. 333-124463 and File No. 811-21763)

Ladies and Gentlemen:

On behalf of Managed Account Series and pursuant to Rule 497 under the Securities Act of 1933, as amended, attached for filing are exhibits containing interactive data format risk/return summary information that mirrors the risk/return summary information in the 497 filing for Global SmallCap Portfolio (the “Fund”), dated August 28, 2013. The purpose of the filing is to submit the 497 filing dated August 28, 2013 in XBRL for the Fund.

Any questions or comments on this filing should be directed to the undersigned at 212-728-8865.

Very truly yours,

/s/ Ryan P. Brizek

Ryan P. Brizek

Enclosures

cc: Ben Archibald, Esq., BlackRock Advisors, LLC

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