Chairman emeritus of SEI Investments (SEIC) sells 62K common shares

Rhea-AI Filing Summary

SEI Investments Chairman Emeritus Alfred P. West Jr. reported open-market sales of 62,447 shares of SEI Investments common stock. The transactions occurred on March 10–11, 2026, with reported weighted-average sale prices per share spanning disclosed ranges from $78.66 to $81.04.

Following these sales, West directly holds 6,875,783 shares of SEI Investments common stock, indicating he retains a large personal stake in the company despite the recent disposals.

Insights

Equity analyst

Insider made open-market sales but retains a large direct stake.

Alfred P. West Jr., Chairman Emeritus of SEI Investments, executed open-market sales totaling 62,447 shares of common stock. All five transactions are coded "S" for open-market or private sales, with prices based on weighted-average figures over specified ranges.

After these trades, West still directly owns 6,875,783 shares, and there are no remaining derivative positions listed in this filing. The sales therefore represent only a small fraction of his visible holdings, suggesting a routine liquidity move rather than a wholesale reduction of exposure, based solely on this disclosure.

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^*

WEST ALFRED P JR

(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)
			Chairman Emeritus

3. Date of Earliest Transaction (Month/Day/Year)
03/10/2026

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	03/10/2026		S		178	D	$78.88(1)	6,938,052	D
Common Stock	03/10/2026		S		25,391	D	$79.97(2)	6,912,661	D
Common Stock	03/10/2026		S		29,431	D	$80.47(3)	6,883,230	D
Common Stock	03/11/2026		S		6,076	D	$79.11(4)	6,877,154	D
Common Stock	03/11/2026		S		1,371	D	$79.94(5)	6,875,783	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

Explanation of Responses:

1. All shares sold for the same price.

2. Represents the weighted average of a range of sale prices from $79.12 to $80.11. 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.

3. Represents the weighted average of a range of sale prices from $80.12 to $81.04. 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.

4. Represents the weighted average of a range of sale prices from $78.66 to $79.64. 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.

5. Represents the weighted average of a range of sale prices from $79.67 to $80.60. 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.

Remarks:

	/s/ Alfred P. West, Jr., by Diane Gallagher, attorney in fact	03/12/2026
	** 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.
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FAQ

How many SEI Investments (SEIC) shares did Alfred P. West Jr. sell?

Alfred P. West Jr. sold 62,447 shares of SEI Investments common stock. The Form 4 shows five open-market sale transactions, all in March 2026, with each transaction coded as a sale of non-derivative common stock.

On what dates did Alfred P. West Jr. sell SEI Investments (SEIC) shares and at what prices?

He sold SEI Investments shares on March 10 and 11, 2026. Reported weighted-average sale prices per share fall within disclosed ranges from $78.66 to $81.04, with the filing offering to provide exact price breakdowns upon request.

What is Alfred P. West Jr.’s remaining SEI Investments (SEIC) ownership after these sales?

Following the reported transactions, Alfred P. West Jr. directly holds 6,875,783 shares of SEI Investments common stock. This remaining position, shown in the post-transaction share balances on the Form 4, indicates he continues to maintain a substantial direct stake.

What role does Alfred P. West Jr. hold at SEI Investments (SEIC) in this filing?

In this Form 4, Alfred P. West Jr. is identified as Chairman Emeritus of SEI Investments. He is not flagged as a current director, officer, or ten percent owner in the structured data, but remains a significant longstanding insider through his large shareholding.

Were Alfred P. West Jr.’s SEI Investments (SEIC) share sales open-market transactions?

Yes. Each transaction in the filing is coded “S” with the description “Sale in open market or private transaction.” The structured data further labels the action as an open-market sale of non-derivative common stock for every reported trade.

Does the SEI Investments (SEIC) Form 4 show any remaining options or derivatives for Alfred P. West Jr.?

No derivative positions are listed in the derivativeSummary section of this Form 4. All reported transactions involve non-derivative common stock, and the derivative summary is empty, indicating no visible options or similar instruments in this particular filing.