Insider at SEI Investments (NASDAQ: SEIC) sells 4,000 shares after awards

Rhea-AI Filing Summary

SEI Investments insider Mark Andrew Warner reported multiple transactions in company stock. He exercised stock options covering 2,000 shares on two occasions and separately acquired 2,000 and 2,000 shares of common stock at $71.12 per share as employment compensation. He also sold 4,000 shares of common stock in open-market transactions at a weighted average price of $81.74 per share, based on individual sales between $81.67 and $81.80. After these trades, he directly owns 921 shares of SEI Investments common stock.

SEC Form 4

FORM 4

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
or Section 30(h) of the Investment Company Act of 1940

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

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Warner Mark Andrew

(Last) (First) (Middle)

1 FREEDOM VALLEY DRIVE

(Street)

OAKS PA 19456

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
SEI INVESTMENTS CO [ SEIC ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
	Officer (give title below)	X	Other (specify below)
			See Remarks

3. Date of Earliest Transaction (Month/Day/Year)
02/25/2026

4. 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 Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	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	02/25/2026		A		2,000	A	$71.12	2,921	D
Common Stock	02/25/2026		A		2,000	A	$71.12	4,921	D
Common Stock	02/25/2026		S		4,000	D	$81.74(1)	921	D

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 (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	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 (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (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: 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
STOCK OPTION RIGHT TO PURCHASE	$71.12	02/25/2026		M			2,000	12/31/2021	12/12/2027	Common Stock	2,000	(2)	0	D
STOCK OPTION RIGHT TO PURCHASE	$71.12	02/25/2026		M			2,000	12/31/2024	12/12/2027	Common Stock	2,000	(2)	0	D

Explanation of Responses:

1. Represents the weighted average of a range of sale prices from $81.67 to $81.80. The reporting person undertakes to provide to the Staff of the Securities and Exchange Commission, the Company, or any stockholder of the Company, upon request, full information regarding the number of shares sold at each separate price.

2. Received as employment compensation

Remarks:

Chief Accounting Officer and Controller

	/s/Mark Andrew Warner, by Diane Gallagher, attorney in fact	02/26/2026
	** 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.

FAQ

What insider transactions did Mark Andrew Warner report for SEIC?

Mark Andrew Warner reported option exercises, stock grants, and a sale. He exercised stock options twice for 2,000 shares each, received two 2,000-share common stock awards as employment compensation, and sold 4,000 shares of SEI Investments common stock in open-market transactions.

How many SEI Investments (SEIC) shares did the insider sell and at what price?

The insider sold 4,000 SEI Investments common shares. The weighted average sale price was $81.74 per share, based on individual sale prices ranging from $81.67 to $81.80, as disclosed in the footnote to the reported transactions.

What SEIC stock awards did Mark Andrew Warner receive in this Form 4?

He received two awards of 2,000 shares of SEI Investments common stock each. Both awards were recorded at a price of $71.12 per share and were specifically described in the filing footnotes as being received as employment compensation.

How many SEI Investments (SEIC) shares does the insider own after these trades?

Following the reported transactions, Mark Andrew Warner directly owns 921 shares of SEI Investments common stock. This figure reflects the net result of his option exercises, stock awards received as compensation, and the 4,000 shares sold in the open market.

What option-related transactions were included in this SEIC Form 4 filing?

The filing shows two derivative transactions labeled as stock option rights to purchase. Each involved 2,000 underlying shares, coded as exercises or conversions of derivative securities, indicating options were exercised rather than newly granted or sold.