SEI Investments EVP Michael Lane sells 2,400 shares

An additional 330 shares are listed as held indirectly through the Employee Stock Purchase Plan.

Available on EDGAR 09/24/2026 - 04:15 PM EDT Accepted by SEC EDGAR 09/24/2026 - 04:15 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

SEI INVESTMENTS CO Executive Vice President Michael Lane sold 2,400 common shares on September 22, 2026, at a weighted average price of $102.78 per share; the reported sale prices ranged from $102.76 to $102.79. He directly held 39,581 shares after the sale. Separately, 330 shares were held indirectly through the Employee Stock Purchase Plan, with a footnote describing approximately 125 shares purchased through that plan. No Rule 10b5-1 plan is reported.

Insider Trade Summary

Net Seller: 2,400 shares

Net Sell 1 txn

Insider LANE MICHAEL

Role Executive Vice President

Sold 2,400 shs ($247K)

Share of Position Sold 5.7%

Type	Security	Shares	Price	Value
Sale	Common Stock F1	2,400	$102.78	$247K
Holding	Common Stock F2	--	--	--

Holdings After Transaction: Common Stock — 39,581 shares (Direct); Common Stock — 330 shares (Indirect, By Employee Stock Purchase Plan)

Holdings Before and After: Common Stock, 41,981 to 39,581 shares (Direct)

Other Insiders: 3 other insiders reported open-market sales of this stock in the 30 days up to this filing.

Footnotes (2)

1. F1. Represents the weighted average of a range of sale prices from $102.76 to $102.79. 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. Reflects the addition of approximately 125 shares purchased by the reporting person through the Company's Employee Stock Purchase Plan.

Key Figures

Common shares sold: 2,400 shares Weighted average sale price: $102.78 per share Sale price range: $102.76–$102.79 per share +3 more

6 metrics

Common shares sold 2,400 shares Sold on September 22, 2026

Weighted average sale price $102.78 per share Sale on September 22, 2026

Sale price range $102.76–$102.79 per share Reported range for the sale

Direct shares held after sale 39,581 shares Following the September 22, 2026 transaction

Indirect shares held 330 shares Held through the Employee Stock Purchase Plan

Shares added through Employee Stock Purchase Plan Approximately 125 shares As described in the footnote

Key Terms

weighted average, Employee Stock Purchase Plan, Rule 10b5-1 plan

3 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.

Employee Stock Purchase Plan financial

"purchased by the reporting person through the Company's Employee Stock Purchase Plan"

An employee stock purchase plan is a company program that lets workers buy shares through small payroll deductions, often at a discount to the market price and after a set offering period. Think of it like a workplace savings plan that turns into ownership: it encourages employees to share in the company’s success and can create predictable buying or selling of stock that investors watch because it affects supply, demand and employee incentives.

Rule 10b5-1 plan regulatory

"No Rule 10b5-1 plan is reported"

A Rule 10b5-1 plan is a prearranged, written schedule that lets corporate insiders buy or sell company stock at set times or amounts, even if they later learn material nonpublic information. Think of it like setting an automatic thermostat for trades: it creates a clear record that trades were planned in advance, reducing the risk of insider-trading accusations and helping investors trust that insider transactions are routine rather than based on secret information.

FAQ

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

How many shares did SEIC Executive Vice President Michael Lane sell, and at what price?

Michael Lane sold 2,400 SEI Investments common shares on September 22, 2026, at a weighted average price of $102.78 per share. The reported sale prices ranged from $102.76 to $102.79 per share.

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

Form 4 Insider Transactions: What Each Field Means →

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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^*

LANE MICHAEL

(Last) (First) (Middle)

ONE 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)
	Executive Vice President

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/22/2026

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	09/22/2026		S		2,400	D	$102.78(1)	39,581	D
Common Stock								330(2)	I	By Employee Stock Purchase Plan

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 $102.76 to $102.79. 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. Reflects the addition of approximately 125 shares purchased by the reporting person through the Company's Employee Stock Purchase Plan.

	/s/ Michael Lane by Lindsay A. Barci, attorney in fact	09/24/2026
	** 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)