SEI Investments director plans $885K share sale

SEI Investments Co. director William Doran reported a planned sale of 8,000 common shares, with an aggregate market value of $885,360 and an approximate sale date of November 10, 2026.

Available on EDGAR 11/10/2026 - 05:02 PM EST Accepted by SEC EDGAR 11/10/2026 - 05:01 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

SEI Investments Co. director William Doran reported a planned sale of 8,000 common shares, with an aggregate market value of $885,360 and an approximate sale date of November 10, 2026. UBS Financial Services Inc. is listed as the broker. Doran reported acquiring 10,000 common shares through an options exercise on November 4, 2026.

Key Figures

Shares to be sold: 8,000 shares Aggregate market value: $885,360 Shares acquired through options exercise: 10,000 shares +1 more

4 metrics

Shares to be sold 8,000 shares Common stock

Aggregate market value $885,360 Shares listed for sale

Shares acquired through options exercise 10,000 shares Acquired November 4, 2026

Shares outstanding 118,587,864 shares Count listed in the securities information

Key Terms

options exercise, Aggregate Market Value, Number of Shares or Other Units Outstanding

3 terms

options exercise financial

"Nature of Acquisition Transaction: options exercise"

Exercising an option is the act of using a contract that gives you the right to buy or sell a specific stock at a set price. For investors, the decision to exercise matters because it turns a paper right into an actual trade — it can create immediate profit or loss, change how many shares are outstanding (which can dilute ownership), affect cash the investor must pay or receive, and trigger tax consequences, much like deciding to redeem a coupon for a fixed-price purchase.

Aggregate Market Value financial

"Aggregate Market Value"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

Number of Shares or Other Units Outstanding financial

"Number of Shares or Other Units Outstanding"

FAQ

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How many SEIC shares does William Doran plan to sell?

William Doran plans to sell 8,000 common shares, with an aggregate market value of $885,360 and an approximate sale date of November 10, 2026. UBS Financial Services Inc. is listed as the broker.

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

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Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001191719
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	SEI Investments
SEC File Number	000-10200
Address of Issuer	1 Freedom Valley Drive Oakes PENNSYLVANIA 19456
Phone	6106764076
Name of Person for Whose Account the Securities are To Be Sold	William Doran
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Director

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
common stock	UBS Financial Services Inc 1000 Harbor Blvd 3rd Floor Weehawken NJ 07086	8000	885360	118587864	11/10/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
common stock	11/04/2026	options exercise	SEI Investments			10000	11/04/2026	fed wire

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Nothing to Report

144: Remarks and Signature

Remarks
Date of Notice	11/10/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/JOSEPH CASSIDY, for UBS Financial Services Inc, as attorney-in-fact for William Doran
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)