SEI Investments (SEIC) 8-K Sei Declares Dividend of $0.26 Per Share

Exhibit 99.1

Company Contact:

Dana Grosser

SEI

+1 610-676-2459

dgrosser@seic.com

Pages: 1

FOR IMMEDIATE RELEASE

SEI DECLARES DIVIDEND OF $0.26 PER SHARE

OAKS, Pa., May 25, 2016 - The Board of Directors of SEI Investments Company (NASDAQ: SEIC) today declared a regular semi-annual dividend of $.26 (twenty-six cents) per share. The cash dividend will be payable to shareholders of record on June 14, 2016, with a payment date of June 22, 2016.

About SEI

SEI (NASDAQ:SEIC) is a leading global provider of investment processing, investment management, and investment operations solutions that help corporations, financial institutions, financial advisors, and ultra-high-net-worth families create and manage wealth. As of March 31, 2016, through its subsidiaries and partnerships in which the company has a significant interest, SEI manages or administers $684 billion in mutual fund and pooled or separately managed assets, including $265 billion in assets under management and $419 billion in client assets under administration. For more information, visit seic.com.

# # #