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Form 3 SEI INVESTMENTS CO For: May 26 Filed by: Shah Sneha S.

July 23, 2026 3:37 PM
FORM 3 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
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1. Name and Address of Reporting Person *
Shah Sneha S.

(Last) (First) (Middle)
1 FREEDOM VALLEY DRIVE

(Street)
OAKS PA 19456

(City) (State) (Zip)
2. Date of Event Requiring Statement (Month/Day/Year)
05/26/2026
3. Issuer Name and Ticker or Trading Symbol
SEI INVESTMENTS CO [ SEIC ]
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director 10% Owner
X Officer (give title below) Other (specify below)
EVP &Head-New Bus Ventures SEI
5. If Amendment, Date of Original Filed (Month/Day/Year)
6. Individual or Joint/Group Filing (Check Applicable Line)
X Form filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock 17,838 (1) (2)
D
Common Stock 220.5625
I
By Employee Stock Purchase Plan
Table II - Derivative Securities Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4) 2. Date Exercisable and Expiration Date (Month/Day/Year) 3. Title and Amount of Securities Underlying Derivative Security (Instr. 4) 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 6. Nature of Indirect Beneficial Ownership (Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Option to Purchase Common Stock (2) 12/31/2024 07/24/2033 Common Stock 7,500 64.08 D
Option to Purchase Common Stock (2) (3) 07/24/2033 Common Stock 7,500 64.08 D
Option to Purchase Common Stock (2) 12/31/2025 12/15/2033 Common Stock 10,000 62 D
Option to Purchase Common Stock (2) (4) 12/15/2033 Common Stock 10,000 62 D
Option to Purchase Common Stock (2) (5) 12/12/2034 Common Stock 22,500 86.58 D
Option to Purchase Common Stock (2) (6) 12/12/2035 Common Stock 24,500 83 D
Explanation of Responses:
1. Securities reported herein were acquired pursuant to awards granted prior to the reporting person becoming a Section 16 filer and thus were not previously reported.
2. Received as employment compensation.
3. Vest on December 31 of the year in which the Issuer attains an adjusted pre-tax earnings per share of $6.25 or more, but not earlier than the fourth anniversary of the date of grant, in each case based upon audited financial statements of the Issuer for the applicable year and subject to certain adjustments.
4. Vest on December 31 of the year in which the Issuer attains an adjusted pre-tax earnings per share of $7.10 or more, but not earlier than the fourth anniversary of the date of grant, in each case based upon audited financial statements of the Issuer for the applicable year and subject to certain adjustments.
5. Vest on the later of (a) December 12, 2026, and (b) the date on which the Issuer achieves adjusted full-year earnings per share that are equal to or greater than an amount that is 25% more than the Issuer's adjusted earnings per share for the year ended December 31, 2024, based upon the financial statements of the Issuer for the applicable year and subject to certain adjustments.
6. Vest on the later of (a) December 12, 2027, and (b) the date on which the Issuer achieves adjusted full-year earnings per share that are equal to or greater than an amount that is 25% more than the Issuer's adjusted earnings per share for the year ended December 31, 2025, based upon the financial statements of the Issuer for the applicable year and subject to certain adjustments.
/s/ Sneha S. Shah, by Diane Gallagher, attorney-in-fact 07/23/2026
** Signature of Reporting Person Date
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.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

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