SEI Investments (SEIC) 8-K Submission of Matters to a Vote of Security Holders

Exhibit 99.1

NEWS FROM SEI

Company Contact:

Dana Grosser

SEI

+1 610-676-2459

dgrosser@seic.com

Pages: 1

FOR IMMEDIATE RELEASE

SEI DECLARES INCREASED DIVIDEND OF $.12 PER SHARE AND

INCREASE IN STOCK REPURCHASE PROGRAM

OAKS, Pa., May 25, 2011 –The Board of Directors of SEI Investments Company (NASDAQ: SEIC) today declared an increased dividend of $.12 (twelve cents) per share. The cash dividend will be payable to shareholders of record on June 20, 2011, with a payment date of June 28, 2011.

In addition, SEI’s Board of Directors also approved an increase in its stock repurchase program by an additional $100 million.

About SEI

SEI (NASDAQ:SEIC) is a leading global provider of investment processing, fund processing, and investment management business outsourcing solutions that help corporations, financial institutions, financial advisors, and ultra-high-net-worth families create and manage wealth. As of March 31, 2011, through its subsidiaries and partnerships in which the company has a significant interest, SEI manages or administers $429 billion in mutual fund and pooled assets or separately managed assets, including $179 billion in assets under management and $250 billion in client assets under administration. For more information, visitwww.seic.com.

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