Kathryn McCarthy (SEIC) Reports 10,000-Share Exercise and Sale on Form 4

Rhea-AI Filing Summary

Kathryn McCarthy, a director of SEI Investments Company (SEIC), reported both acquisition and disposition of SEIC common stock on 09/29/2025. The Form 4 shows a non-derivative purchase of 10,000 shares at $53.34 and a sale of 10,000 shares at a weighted-average price of $85.66, resulting in reported beneficial ownership changing from 85,641 shares to 75,641 shares after the sale. Table II shows two option-based transactions executed the same day: two option exercises each for 5,000 shares with a $53.34 exercise price and underlying shares noted as received as employment compensation, and the reported post-transaction derivative holdings are zero. The form is signed on behalf of Ms. McCarthy by an attorney-in-fact and includes an explanatory note that the sale price is a weighted average across prices $85.51–$85.80.

Insights

Financial Analyst

TL;DR: Insider exercised options and sold an equal number of shares same day, reducing direct holdings by 10,000 shares to 75,641.

The transactions are routine: two option exercises (5,000 shares each) at $53.34 were reported and the reporting person sold 10,000 shares at a weighted-average of $85.66. The exercises reflect prior compensation awards being converted into stock and the immediate sale suggests monetization of those shares rather than a net increase in long-term ownership. The magnitude—10,000 shares relative to total holdings shown—appears modest and likely not material to SEIC's overall capitalization based on information provided in this Form 4 alone.

Corporate Governance Expert

TL;DR: Disclosure is complete and includes weighted-average sale price and compensation note; form appears properly executed by attorney-in-fact.

The filing includes required details: transaction codes, exercise prices, number of shares, ownership form, and an explanatory remark that options were received as employment compensation. The sale price range is disclosed and the filer offers to provide breakdowns on request, which supports transparency. The form is signed by an authorized agent, satisfying procedural formalities in the submission.

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
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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).

1. Name and Address of Reporting Person^*

MCCARTHY KATHRYN

(Last) (First) (Middle)

ONE 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)

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

3. Date of Earliest Transaction (Month/Day/Year)
09/29/2025

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	09/29/2025		M		10,000	A	$53.34	85,641	D
Common Stock	09/29/2025		S		10,000	D	$85.66(1)	75,641	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
Option to Purchase Common Stock	$53.34	09/29/2025		M			5,000	12/31/2017	12/08/2025	Common Stock	5,000	(2)	0	D
Option to Purchase Common Stock	$53.34	09/29/2025		M			5,000	12/31/2018	12/08/2025	Common Stock	5,000	(2)	0	D

Explanation of Responses:

1. Represents the weighted average of a range of sale prices from $85.51 to $85.80. 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:

	/s/ Kathryn McCarthy, by Diane Gallagher, attorney in fact	09/29/2025
	** 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 transactions did Kathryn McCarthy report on SEIC Form 4?

She reported a purchase of 10,000 shares at $53.34 and a sale of 10,000 shares at a weighted-average $85.66 on 09/29/2025.

Were any options exercised by the reporting person in this Form 4 for SEIC?

Yes. Two option exercises were reported on 09/29/2025 (5,000 shares each) with a $53.34 exercise price; underlying shares were received as employment compensation.

How many SEIC shares did Kathryn McCarthy own after the reported transactions?

75,641 shares beneficially owned following the sale reported on the form.

What price range was used to calculate the reported sale price on the Form 4?

The weighted-average sale price of $85.66 represents a range of sale prices from $85.51 to $85.80 as disclosed in the filing.

Who signed the Form 4 for Kathryn McCarthy?

The form was signed on behalf of Kathryn McCarthy by Diane Gallagher, attorney-in-fact, on 09/29/2025.