SEI Investments CAO exercises options, sells stock

SEI Investments Company Chief Accounting Officer and Controller Mark Andrew Warner reported a series of option exercises and related stock sales on July 28, 2026.

Rhea-AI Filing Summary

SEI Investments Company Chief Accounting Officer and Controller Mark Andrew Warner reported a series of option exercises and related stock sales on July 28, 2026. He exercised employee stock options covering 15,000 shares of common stock at exercise prices of $64.4300 and $56.5400 per share, received as employment compensation. On the same date, he acquired 15,000 shares of common stock through these exercises and then sold an aggregate 15,000 shares in open-market or private transactions at per-share prices of $101.1050, $102.0110, and $102.9720, each representing a weighted average over price ranges from $100.45 to $103.23 as described in the footnotes.

Insider Trade Summary

Exercise and Sale: 15,000 shares ($648K approx. pre-tax spread)

Exercise and Sale 11 txns

Insider Warner Mark Andrew

Role See Remarks*

Sold 15,000 shs ($1.54M)

Approx. gross sale proceeds $1.54M

Approx. exercise cost $888K

Approx. pre-tax spread $648K

Type	Security	Shares	Price	Value
Exercise	Option to Purchase Common Stock F4	2,500	--	--
Exercise	Option to Purchase Common Stock F4	2,500	--	--
Exercise	Option to Purchase Common Stock F4	5,000	--	--
Exercise	Option to Purchase Common Stock F4	5,000	--	--
Exercise	Common Stock	2,500	$64.43	$161K
Exercise	Common Stock	2,500	$64.43	$161K
Exercise	Common Stock	5,000	$56.54	$283K
Exercise	Common Stock	5,000	$56.54	$283K
Sale	Common Stock F1	2,300	$101.105	$233K
Sale	Common Stock F2	5,300	$102.011	$541K
Sale	Common Stock F3	7,400	$102.972	$762K

Holdings After Transaction: Option to Purchase Common Stock — 0 contracts (Direct); Common Stock — 921 shares (Direct)

Footnotes (4)

1. F1. Represents the weighted average of a range of sale prices from $100.45 to $101.37. 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 $101.57 to $102.41. 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. F3. Represents the weighted average of a range of sale prices from $102.60 to $103.23. 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. F4. Received as employment compensation.

Key Figures

Options exercised: 15000 shares Shares sold: 15000 shares Exercise price tranche 1: $64.4300 per share +4 more

7 metrics

Options exercised 15000 shares Total underlying shares from derivative option exercises on 2026-07-28

Shares sold 15000 shares Aggregate SEI Investments common stock sold on 2026-07-28

Exercise price tranche 1 $64.4300 per share Options to Purchase Common Stock exercised on 5,000 underlying shares expiring 2029-12-09

Exercise price tranche 2 $56.5400 per share Options to Purchase Common Stock exercised on 10,000 underlying shares expiring 2030-12-08

Weighted-average sale price 1 $101.1050 per share 2,300 shares sold; weighted-average price over $100.45–$101.37 range (footnote F1)

Weighted-average sale price 2 $102.0110 per share 5,300 shares sold; weighted-average price over $101.57–$102.41 range (footnote F2)

Weighted-average sale price 3 $102.9720 per share 7,400 shares sold; weighted-average price over $102.60–$103.23 range (footnote F3)

Key Terms

Option to Purchase Common Stock, Exercise or conversion of derivative security, weighted average, Sale in open market or private transaction

4 terms

Option to Purchase Common Stock financial

"security_title: Option to Purchase Common Stock for derivative transactions"

Exercise or conversion of derivative security financial

"transaction_code_description: Exercise or conversion of derivative security"

weighted average financial

"Represents the weighted average of a range of sale prices from $100.45 to $101.37"

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.

Sale in open market or private transaction financial

"transaction_code_description: Sale in open market or private transaction"

FAQ

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

What insider transactions did SEIC’s Mark Andrew Warner report on July 28, 2026?

Mark Andrew Warner reported exercising stock options for 15,000 shares of SEI Investments common stock and selling 15,000 shares of common stock the same day in multiple open-market or private transactions at weighted-average prices above $100 per share.

How many SEIC stock options did Mark Andrew Warner exercise, and at what prices?

Warner exercised options covering 15,000 shares of SEI Investments common stock. The options had exercise prices of $64.4300 per share on 5,000 underlying shares and $56.5400 per share on 10,000 underlying shares, all noted as received as employment compensation.

How many SEIC shares did Mark Andrew Warner sell and at what prices?

He sold an aggregate 15,000 shares of SEI Investments common stock in three transactions. Reported per-share prices were weighted averages of $101.1050, $102.0110, and $102.9720, each reflecting sale ranges from $100.45 up to $103.23 per share.

Were Mark Andrew Warner’s SEIC option exercises related to his employment compensation?

Yes. The options exercised by Mark Andrew Warner are footnoted as “Received as employment compensation”, indicating they were granted in connection with his role as Chief Accounting Officer and Controller at SEI Investments Company rather than purchased on the open market.

Did SEIC’s Mark Andrew Warner make his July 28, 2026 trades under a Rule 10b5-1 plan?

The filing’s Rule 10b5-1 checkbox is not marked as affirming a trading plan for these transactions. The footnotes describe weighted-average sale prices and compensation-related options but do not state that the trades occurred under a Rule 10b5-1 plan.

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

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Available on EDGAR 07/30/2026 - 04:07 PM Accepted by SEC EDGAR 07/30/2026 - 04:06 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^*

Warner Mark Andrew

(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
X	Officer (give title below)		Other (specify below)
	See Remarks*

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
07/28/2026

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	07/28/2026		M		2,500	A	$64.43	3,421	D
Common Stock	07/28/2026		M		2,500	A	$64.43	5,921	D
Common Stock	07/28/2026		M		5,000	A	$56.54	10,921	D
Common Stock	07/28/2026		M		5,000	A	$56.54	15,921	D
Common Stock	07/28/2026		S		2,300	D	$101.105(1)	13,621	D
Common Stock	07/28/2026		S		5,300	D	$102.011(2)	8,321	D
Common Stock	07/28/2026		S		7,400	D	$102.972(3)	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
Option to Purchase Common Stock	$64.43	07/28/2026		M			2,500	12/31/2021	12/09/2029	Common Stock	2,500	(4)	0	D
Option to Purchase Common Stock	$64.43	07/28/2026		M			2,500	12/31/2025	12/09/2029	Common Stock	2,500	(4)	0	D
Option to Purchase Common Stock	$56.54	07/28/2026		M			5,000	12/31/2022	12/08/2030	Common Stock	5,000	(4)	0	D
Option to Purchase Common Stock	$56.54	07/28/2026		M			5,000	12/31/2024	12/08/2030	Common Stock	5,000	(4)	0	D

Explanation of Responses:

1. Represents the weighted average of a range of sale prices from $100.45 to $101.37. 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 $101.57 to $102.41. 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 $102.60 to $103.23. 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. Received as employment compensation.

Remarks:

Title: Chief Accounting Officer and Controller

	/s/ Mark Andrew Warner by Lindsay A. Barci, attorney in fact	07/30/2026
	** 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)