SEI Investments: Alfred P. West Jr. sells 28,394 shares

The reported sale prices were weighted averages within disclosed ranges, and no Rule 10b5-1 plan is reported.

Rhea-AI Filing Summary

SEI Investments Co. (SEIC) Chairman Emeritus Alfred P. West Jr. reported selling 28,394 common shares on September 29, 2026, at a weighted average of $103.403 per share, and 5,483 common shares on September 30, 2026, at a weighted average of $103.162 per share. The sale-price ranges were $103.17 to $103.67 on September 29 and $102.96 to $103.89 on September 30. No Rule 10b5-1 plan is reported.

Insider Trade Summary

Net Seller: 33,877 shares

Net Sell 2 txns

Insider WEST ALFRED P JR

Role Insider

Sold 33,877 shs ($3.50M)

Type	Security	Shares	Price	Value
Sale	Common Stock F2	5,483	$103.162	$566K
Sale	Common Stock F1	28,394	$103.403	$2.94M

Holdings After Transaction: Common Stock — 6,784,574 shares (Direct)

Footnotes (2)

1. F1. Represents the weighted average of a range of sale prices from $103.17 to $103.67. 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. F2. Represents the weighted average of a range of sale prices from $102.96 to $103.89. 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.

Key Figures

Shares sold: 28,394 shares Weighted average sale price: $103.403 per share Shares sold: 5,483 shares +1 more

4 metrics

Shares sold 28,394 shares September 29, 2026

Weighted average sale price $103.403 per share September 29, 2026; sale prices ranged from $103.17 to $103.67

Shares sold 5,483 shares September 30, 2026

Weighted average sale price $103.162 per share September 30, 2026; sale prices ranged from $102.96 to $103.89

Key Terms

weighted average

1 terms

weighted average financial

"weighted average of a range of sale prices"

A weighted average is a way of calculating an overall number when some items matter more than others by giving each item a different level of importance, or weight. Investors use weighted averages to combine figures like prices, returns or earnings so the result reflects the size or significance of each part — like grading a class where a final exam counts more than a quiz, producing a score that better represents true performance.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many SEIC shares did Alfred P. West Jr. sell, and at what prices?

Alfred P. West Jr., SEI Investments Co.'s Chairman Emeritus, sold 28,394 shares on September 29, 2026, at a weighted average of $103.403 per share, and 5,483 shares on September 30, 2026, at a weighted average of $103.162 per share. The respective sale-price ranges were $103.17 to $103.67 and $102.96 to $103.89.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/01/2026 - 04:06 PM Accepted by SEC EDGAR 10/01/2026 - 04:05 PM Learn about SEC filing dates

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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 PENNSYLVANIA 19456

(City) (State) (Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/29/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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	09/29/2026		S		28,394	D	$103.403(1)	6,790,057	D
Common Stock	09/30/2026		S		5,483	D	$103.162(2)	6,784,574	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. Represents the weighted average of a range of sale prices from $103.17 to $103.67. 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. Represents the weighted average of a range of sale prices from $102.96 to $103.89. 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.

	/s/ Alfred P. West, Jr., by Lindsay A. Barci, attorney in fact	10/01/2026
	** 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.
* Form 4: SEC 1474 (03-26)