Sec Form 3/A Filing - Hicke Ryan @ SEI INVESTMENTS CO - 2023-03-11

FORM 3/A Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Hicke Ryan 2. Issuer Name and Ticker or Trading Symbol SEI INVESTMENTS CO [ SEIC] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) See Remarks* (Last) (First) (Middle) 1 FREEDOM VALLEY DRIVE 3. Date of Earliest Transaction (MM/DD/YY) 03/11/2023 (Street) OAKS, PA19456 4. If Amendment, Date Original Filed (MM/DD/YY) 03/11/2023 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 6,812 I By 401(k) Plan Common Stock 1,171 I By Employee Stock Purchase Plan

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Option to Purchase Common Stock $ 23.86 02/28/2014 12/14/2020 Common Stock 15,000 D Option to Purchase Common Stock $ 15.77 12/13/2015 12/13/2021 Common Stock 25,000 D Option to Purchase Common Stock $ 22.45 12/13/2016 12/11/2022 Common Stock 7,500 D Option to Purchase Common Stock $ 28.28 12/31/2013 04/16/2023 Common Stock 12,500 D Option to Purchase Common Stock $ 28.28 12/31/2017 04/16/2023 Common Stock 12,500 D Option to Purchase Common Stock $ 33.76 12/31/2015 12/10/2023 Common Stock 12,500 D Option to Purchase Common Stock $ 33.76 12/31/2018 12/10/2023 Common Stock 12,500 D Option to Purchase Common Stock $ 40.64 12/31/2017 12/09/2024 Common Stock 10,000 D Option to Purchase Common Stock $ 40.64 02/23/2022 12/09/2024 Common Stock 10,000 D Option to Purchase Common Stock $ 53.34 12/31/2017 12/08/2025 Common Stock 12,000 D Option to Purchase Common Stock $ 53.34 12/31/2018 12/08/2025 Common Stock 12,000 D Option to Purchase Common Stock $ 49.63 12/31/2017 12/13/2026 Common Stock 17,500 D Option to Purchase Common Stock $ 49.63 12/31/2019 12/13/2026 Common Stock 17,500 D Option to Purchase Common Stock $ 71.12 02/23/2022 12/12/2027 Common Stock 12,500 D Option to Purchase Common Stock $ 71.12 12/31/2021 12/12/2027 Common Stock 12,500 D Option to Purchase Common Stock $ 48.47 02/23/2022 12/11/2028 Common Stock 17,500 D Option to Purchase Common Stock $ 48.47 12/31/2021 12/11/2028 Common Stock 17,500 D Option to Purchase Common Stock $ 64.43 02/22/2022 12/09/2029 Common Stock 20,000 D Option to Purchase Common Stock $ 64.43 12/31/2021 12/09/2029 Common Stock 20,000 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Hicke Ryan 1 FREEDOM VALLEY DRIVE OAKS, PA19456 X See Remarks* Signatures /s/ Ryan Hicke by Michael N. Peterson, attorney in fact 06/15/2023 Signature of Reporting Person Date

Explanation of Responses:

Remarks: Exhibit 24 - Power of Attorney*Note: At the time the reporting person filed the Form 3 being amended by this Amendment No. 2, he was Executive Vice President of the Issuer. The reporting person became Chief Executive Officer of the Issuer, and a member of the Board of Directors, on June 1, 2022.This Amendment No. 2 to Form 3 is being filed to report that on the date the original Form 3 was filed, the reporting person owned the options with expiration dates of April 16, 2023 and later, which were not previously reported. All other information included herein is as of March 11, 2020 and was previously reported on the original Form 3 or Amendment No. 1 thereto.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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