SEI Investments (SEIC) officer exercises options, sells 4,000 shares

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

SEI Investments officer Mark Andrew Warner reported an exercise-and-sale transaction in company stock. On April 28, 2026, he exercised options to acquire 4,000 shares of common stock at $48.47 per share, then sold 4,000 shares in an open-market trade at $91.16 per share. After these transactions, he directly held 921 shares of SEI Investments common stock. The options involved were originally received as employment compensation, indicating this activity stems from equity-based pay rather than a new grant.

Insider Trade Summary

Net Seller: 4,000 shares ($364,640)

Net Sell 4 txns

Insider Warner Mark Andrew

Role In Remarks

Sold 4,000 shs ($365K)

Type	Security	Shares	Price	Value
Exercise	STOCK OPTION RIGHT TO PURCHASE	2,000	$0.00	--
Exercise	STOCK OPTION RIGHT TO PURCHASE	2,000	$0.00	--
Exercise	Common Stock	4,000	$48.47	$194K
Sale	Common Stock	4,000	$91.16	$365K

Holdings After Transaction: STOCK OPTION RIGHT TO PURCHASE — 0 shares (Direct, null); Common Stock — 4,921 shares (Direct, null)

Footnotes (1)

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Key Figures

Shares sold: 4,000 shares Sale price: $91.16 per share Options exercised: 4,000 shares +3 more

6 metrics

Shares sold 4,000 shares Open-market sale of common stock on April 28, 2026

Sale price $91.16 per share Price for 4,000 common shares sold

Options exercised 4,000 shares Common stock acquired via option exercise

Exercise price $48.47 per share Stock option exercise price for common shares

Shares held after transactions 921 shares Direct common stock ownership after April 28, 2026

Option expiration December 11, 2028 Expiration date for the exercised stock options

Key Terms

open-market sale, derivative exercise/conversion, Common Stock, STOCK OPTION RIGHT TO PURCHASE, +1 more

5 terms

open-market sale financial

"transaction_action": "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

derivative exercise/conversion financial

"transaction_action": "derivative exercise/conversion""

Common Stock financial

"security_title": "Common Stock""

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

STOCK OPTION RIGHT TO PURCHASE financial

"security_title": "STOCK OPTION RIGHT TO PURCHASE""

employment compensation financial

"footnote": {"_": "Received as employment compensation""

Form 4 Insider Transactions: What Each Field Means →

04/30/2026 - 11:35 AM

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)
	In Remarks

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/28/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	04/28/2026		M		4,000	A	$48.47	4,921	D
Common Stock	04/28/2026		S		4,000	D	$91.16	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
STOCK OPTION RIGHT TO PURCHASE	$48.47	04/28/2026		M			2,000	12/31/2021	12/11/2028	Common Stock	2,000	⁽¹⁾	0	D
STOCK OPTION RIGHT TO PURCHASE	$48.47	04/28/2026		M			2,000	12/31/2025	12/11/2028	Common Stock	2,000	⁽¹⁾	0	D

Explanation of Responses:

1. Received as employment compensation

Remarks:

Title: Chief Accounting Officer and Controller

	/s/Mark Andrew Warner, by Diane Gallagher, attorney in fact	04/30/2026
	** 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)

Source: View Original Filing on SEC EDGAR

FAQ

What insider transaction did SEI Investments (SEIC) disclose for Mark Andrew Warner?

SEI Investments reported that officer Mark Andrew Warner exercised options for 4,000 common shares and sold 4,000 shares in an open-market transaction. These moves were reported for April 28, 2026, and relate to equity previously received as employment compensation.

How many SEI Investments (SEIC) shares did Mark Andrew Warner sell and at what price?

Mark Andrew Warner sold 4,000 SEI Investments common shares in an open-market transaction at $91.16 per share. This sale followed the exercise of stock options and was reported in the Form 4 filed for transactions dated April 28, 2026.

What stock options did Mark Andrew Warner exercise at SEI Investments (SEIC)?

He exercised stock options covering 4,000 SEI Investments common shares at an exercise price of $48.47 per share. These options were granted as employment compensation and had underlying rights to purchase common stock that were fully exercised in this transaction.

How many SEI Investments (SEIC) shares does Mark Andrew Warner hold after the Form 4 transactions?

Following the reported exercise-and-sale activity, Mark Andrew Warner directly holds 921 shares of SEI Investments common stock. This figure reflects his remaining position after exercising options for 4,000 shares and selling 4,000 shares on April 28, 2026.

Were the SEI Investments (SEIC) options involved in Mark Andrew Warner’s transaction compensation-related?

Yes. A footnote states the stock options were received as employment compensation. This means the exercised options originated from SEI Investments’ equity-based pay rather than open-market purchases, framing the transaction as monetizing prior compensation.