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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
350894	Sei Investments Co	SEIC	Security Brokers, Dealers & Flotation Companies (6211)	231707341

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1059374	Jr P Alfred West	One Freedom Valley Drive Oaks PA 19456		Yes	No	Yes	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Disposition	2009-06-18	100,000	$17.58	16,111,196	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Direct

Footnotes

This amended form 4 is being filed to correctly reflect the reporting person's initial direct ownership of shares of SEI Investments Company ("SEI") common stock, which ownership was over-reported due to an inadvertent mathematical error by 728 shares. The reporting person's direct ownership of shares of SEI following the transactions reported on the original form 4 should have been reported as 16,111,196 shares, instead of 16,400,808, as a result of and after taking into account (i) such 728 shares inadvertently over-reported on the original form 4, (ii) 30,090 shares inadvertently over-reported by the reporting person on a form 4 originally filed on August 5, 2008 and amended on the date of this report and (iii) 258,794 shares inadvertently over-reported by the reporting person on a form 4 originally filed on May 8, 2009 and amended on the date of this report.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $17.55 to $17.63, inclusive. The reporting person undertakes to provide to SEI, any security holder of SEI, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (2) of this form 4.