UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                  SCHEDULE 13G



                    Under the Securities Exchange Act of 1934
                               (Amendment No. 3)*

                             SEI INVESTMENTS COMPANY
                                (Name of Issuer)

                          Common Stock, $.01 par value
                         (Title of Class of Securities)

                                   784117 10 3
                                 (CUSIP Number)

                                December 31, 2001
             (Date of Event which Requires filing of this Statement)


Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

        [ ]  Rule 13d-1(b)
        [x]  Rule 13d-1(c)
        [ ]  Rule 13d-1(d)

*    The remainder of this cover page shall be filled out for a reporting
     person's initial filing on this form with respect to the subject class of
     securities, and for any subsequent amendment containing information which
     would alter the disclosures provided in a prior cover page.

     The information required in the remainder of this cover page shall not be
     deemed to be "filed" for the purpose of Section 18 of the Securities
     Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of
     that section of the Act but shall be subject to all other provisions of the
     Act (however, see the Notes).






CUSIP No.  784117 10 3

________________________________________________________________________________
1.   NAMES OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

     Thomas W. Smith
________________________________________________________________________________
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                 (a) [ ]
                                                                 (b) [x]
________________________________________________________________________________
3    SEC USE ONLY


________________________________________________________________________________
4    CITIZEN OR PLACE OF ORGANIZATION

     United States
________________________________________________________________________________
  NUMBER OF    5.   SOLE VOTING POWER

   SHARES           2,377,355
               _________________________________________________________________
BENEFICIALLY   6.   SHARED VOTING POWER

  OWNED BY          7,130,714
               _________________________________________________________________
    EACH       7.   SOLE DISPOSITIVE POWER

  REPORTING         2,377,355
               _________________________________________________________________
   PERSON      8.   SHARED DISPOSITIVE POWER

    WITH            7,130,714
________________________________________________________________________________
9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     9,508,069
________________________________________________________________________________
10   CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

     Not Applicable
________________________________________________________________________________
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

     8.8%
________________________________________________________________________________
12   TYPE OF REPORTING PERSON

     IN
________________________________________________________________________________


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CUSIP No.  784117 10 3

________________________________________________________________________________
1    NAMES OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (entities only)

     Thomas N. Tryforos
________________________________________________________________________________
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                             (a) [ ]
                                                             (b) [x]
________________________________________________________________________________
3    SEC USE ONLY


________________________________________________________________________________
4    CITIZEN OR PLACE OF ORGANIZATION

     United States
________________________________________________________________________________
  NUMBER OF    5.   SOLE VOTING POWER

   SHARES           0
               _________________________________________________________________
BENEFICIALLY   6.   SHARED VOTING POWER

  OWNED BY          7,130,714
               _________________________________________________________________
    EACH       7.   SOLE DISPOSITIVE POWER

  REPORTING         0
               _________________________________________________________________
   PERSON      8.   SHARED DISPOSITIVE POWER

    WITH            7,130,714
________________________________________________________________________________
9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     7,130,714
________________________________________________________________________________
10   CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

     Not Applicable

________________________________________________________________________________
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

     6.6%
________________________________________________________________________________
12   TYPE OF REPORTING PERSON

     IN
________________________________________________________________________________


                                       -3-



ITEM 1.

     (a)  Name of Issuer:

          SEI Investments Company

     (b)  Address of Issuer's Principal Executive Offices:

          1 Freedom Valley Drive
          Oaks, PA  19456

ITEM 2.

     (a)  Name of Person Filing:

          (i)  Thomas W. Smith

          (ii) Thomas N. Tryforos

          The filing of this Statement shall not be deemed to be an admission
          that the filing persons comprise a "group" within the meaning of
          Section 13(d)(3) of the Securities Exchange Act of 1934, as amended.

     (b)  Address of Principal Business Office:

          The following is the address of the principal business office of each
          of the filing persons:

          323 Railroad Avenue
          Greenwich, CT  06830

     (c)  Citizenship:

          Each of Messrs. Thomas W. Smith and Thomas N. Tryforos is a United
          States citizen.

     (d)  Title of Class of Securities:

          Common Stock, par value $.01 per share.

     (e)  CUSIP Number:

          784117 10 3

ITEM 3. If this Statement is filed pursuant to Rules 13d-1(b) or 13d-2(b) or
       (c), check whether the person filing is a:

          Not applicable.

          If this Statement is filed pursuant to Rule 13d-1(c),
          check this box [x]


                                      -4-




ITEM 4.  Ownership

     (a)  Thomas W. Smith - 9,508,069 shares; Thomas N. Tryforos - 7,130,714
          shares

     (b)  Thomas W. Smith - 8.8%; Thomas N. Tryforos - 6.6%

     (c)  Each of Thomas W. Smith and Thomas N. Tryforos has shared power to
          vote or to direct the vote and shared power to dispose or to direct
          the disposition of 7,130,714 shares; Thomas W. Smith has sole power to
          vote and dispose of 2,377,355 shares, and Thomas N. Tryforos has sole
          power to vote and dispose of no shares.

ITEM 5. Ownership of Five Percent or Less of a Class

          Not applicable.

ITEM 6. Ownership of More than Five Percent on Behalf of Another Person

          Messrs. Smith and Tryforos in the aggregate beneficially own 8,108,069
          shares in their capacities as investment managers for certain managed
          accounts. The managed accounts have the right to receive dividends
          from, and the proceeds from the sale of, the managed accounts' shares.

ITEM 7. Identification and Classification of the Subsidiary Which Acquired the
        Security Being Reported on By the Parent Holding Company

          Not applicable.

ITEM 8.  Identification and Classification of Members of the Group

          Not applicable.

ITEM 9.  Notice of Dissolution of Group

          Not applicable.

ITEM 10. Certification

          By signing below, I certify that, to the best of my knowledge and
          belief, the securities referred to above were not acquired and are not
          held for the purpose of or with the effect of changing or influencing
          the control of the issuer of the securities and were not acquired and
          are not held in connection with or as a participant in any transaction
          having that purpose or effect.


                                      -5-




                                    Signature

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

Date: February 14, 2001


                                             /s/ Thomas W. Smith
                                             -----------------------------------
                                             Thomas W. Smith


                                             /s/ Thomas N. Tryforos
                                             -----------------------------------
                                             Thomas N. Tryforos


                                      -6-




                             JOINT FILING AGREEMENT

     The undersigned agree that the foregoing Statement on Schedule 13G, dated
February 14, 2002, is being filed with the Securities and Exchange Commission on
behalf of each of the undersigned pursuant to Rule 13d-1(k)

Dated: February 14, 2002


                                             /s/ Thomas W. Smith
                                             -----------------------------------
                                             Thomas W. Smith


                                             /s/ Thomas N. Tryforos
                                             -----------------------------------
                                             Thomas N. Tryforos


                                      -7-