SEI Investments Company
|Traded as||NASDAQ: SEIC
S&P 400 Component
|Alfred West, President & CEO|
|Total assets||$779 billion under management or administration (as of March 31, 2017)|
Number of employees
|Approximately 3,200 (March 2017)|
SEI Investments Company, formerly Simulated Environments Inc, is a financial services company headquartered in Oaks, Pennsylvania, United States. The company describes itself as "a global provider of investment processing, investment management, and investment operations solutions". SEI provides products and services to institutions, private banks, investment advisors, investment managers, and private clients. SEI manages, advises or administers $779 billion in hedge funds, private equity, mutual funds and other managed assets. This includes $297 billion in assets under management and $478 billion in client assets under administration. 
SEI was founded as Simulated Environments Inc in 1968 by its current Chairman and CEO, Alfred P. West, Jr. (also known as Al West). West had created the first computer-simulated training technology for loan officers. In the 1970s SEI developed an automated trust and investment accounting system for bank trust departments. In the 1990s SEI launched a wealth management operating platform for independent, fee-based investment advisors.
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. SEI responded that it merely provided a Stanford affiliate with back office services. As of September 2015 the case was still ongoing.
- "SEI - SEI Reports First-Quarter 2017 Financial Results - US" (PDF). SEI.
- "SEI - Home - US". SEI.
- "Office Locations". SEI.
- Terry Baynes and Jonathan Stempel (19 March 2012). "Class-actions by Allen Stanford investors revived". Reuters.
- "Victims of Stanford Group still fight for their money - Baton Rouge Business Report". Baton Rouge Business Report.
- Brent Kendall. "Supreme Court: Stanford's Victims Can Sue Third Parties". WSJ.