Company:  SEI INVESTMENTS CO (SEIC)
Form Type:  10-Q
Filing Date:  11/10/2008 
CIK:  0000350894 
Address:  1 FREEDOM VALLEY DRIVE 
City, State, Zip:  OAKS, Pennsylvania 19456-1100 
Telephone:  (610) 676-1000 
Fiscal Year:  12/31 
Last Trade
Last Trade: 
$17.15  
Change: 
0.21 (1.24%)  
Trade Time: 
Feb 09  
Market Cap: 
$3.27B
Description of Business
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  FORM 10-Q
    PART I. FINANCIAL INFORMATION
      Item 1. Consolidated Financial Statements.
        BALANCE SHEET
        BALANCE SHEET
        INCOME STATEMENT
        INCOME STATEMENT
        CASH FLOW
        Notes to Consolidated Financial Statements
          CASH FLOW
          INCOME STATEMENT
      Item 2. Management's Discussion and Analysis of Financial ...
      Item 3. Quantitative and Qualitative Disclosures About ...
      Item 4. Controls and Procedures.
    PART II. OTHER INFORMATION
      Item 1. Legal Proceedings.
      Item 1A. Risk Factors
      Item 2. Unregistered Sales of Equity Securities and Use of ...
      Item 6. Exhibits.
    SIGNATURES
  EXHIBIT 10.23.3
  EXHIBIT 10.29.12
  EXHIBIT 10.32
  EXHIBIT 10.33
  EXHIBIT 31.1
    CERTIFICATIONS
  EXHIBIT 31.2
    CERTIFICATIONS
  EXHIBIT 32
    CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED ...
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