SEI Investments Company is an American financial services company headquartered in Oaks, Pennsylvania. The company provides financial technology, investment processing, investment operations, and asset management services to financial institutions, investment managers, financial advisers, institutional investors, and other clients.[1] Its common stock is traded on the Nasdaq under the ticker symbol SEIC.[2]
The company was founded in 1968 by Alfred P. West Jr. as Simulated Environments Inc.. Its original business developed from a computer-based commercial-credit simulation used to train bank loan officers. SEI subsequently expanded into investment processing, investment management, outsourced investment operations, and wealth-management technology.[3]
As of September 30, 2026, SEI reported $606.4 billion in assets under management, $1.41 trillion in client assets under administration, and total assets managed, advised, administered, or otherwise reported on its platforms and businesses of $2.106 trillion.[4]
History
Alfred P. West Jr. founded SEI in 1968 under the name Simulated Environments Inc.[5] West studied aerospace engineering at the Georgia Institute of Technology and later earned an MBA from the Wharton School of the University of Pennsylvania. The company's first product was a computer program designed to train loan officers by simulating a lending environment.[5]
SEI became a public company in 1981 and subsequently expanded beyond its original training business into investment advisory and money management.[5] In 1989, the company began providing mutual-fund accounting and distribution services for bank-sponsored funds, and in 1992 it established a business serving independent investment advisers.[6] Over time, SEI also developed businesses providing investment processing, outsourced investment operations, and asset management services.[7]
In 2022, Ryan Hicke succeeded West as chief executive officer, ending West's 54-year tenure as CEO.[5] West remained executive chairman until January 1, 2026, when he left the company's board and became chairman emeritus. Carl A. Guarino succeeded him as chairman.[8]
In December 2025, SEI completed an investment in Stratos Wealth Holdings, a network of affiliated financial-advisory businesses. As of September 30, 2026, Stratos reported $41.7 billion in client assets. Stratos contributed $126.7 million to SEI's revenue during the first nine months of 2026.[9]
In 2012 SEI was sued by investors in connection with the financial crimes committed by Allen Stanford. Stanford had sold investors bogus Certificates of Deposit (CDs) and the investors alleged that SEI, as well as other companies, had promoted and misrepresented the CDs as safe investments without performing appropriate due diligence.[10][11] SEI responded that it merely provided a Stanford affiliate with back office services.[12] As of September 2015 the case was still ongoing.[11]
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