SEI Investments insider files to sell 15,000 shares

Accepted by SEC EDGAR 07/28/2026 - 04:25 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

SEI Investments Co. insider Mark Andrew Warner filed a notice related to common stock of SEI Investments Co., indicating a transaction through Charles Schwab & Co., Inc. for 15,000 shares, with an aggregate value of $1,535,187.00 dated 07/28/2026, described as an Employee Stock Option Exercise with a Broker Payment for Cashless Exercise.

The filing also lists a prior transaction in the past three months: on 04/28/2026, 4,000 shares of SEI Investments Co. common stock were sold for $364,640.00.

Key Figures

Shares covered: 15,000 shares Aggregate value: $1,535,187.00 Recent shares sold: 4,000 shares +2 more

5 metrics

Shares covered 15,000 shares Common stock of SEI Investments Co. in current Form 144 notice dated 07/28/2026

Aggregate value $1,535,187.00 Reported value associated with 15,000 SEI Investments Co. shares

Recent shares sold 4,000 shares Shares sold on 04/28/2026 listed in past three months section

Recent sale value $364,640.00 Dollar amount for 4,000 shares sold on 04/28/2026

Transaction date 07/28/2026 Date associated with the 15,000-share employee stock option exercise

Key Terms

Employee Stock Option Exercise, Broker Payment for Cashless Exercise, Form 144

3 terms

Employee Stock Option Exercise financial

"Common | 07/28/2026 | Employee Stock Option Exercise | SEI INVESTMENTS CO"

Broker Payment for Cashless Exercise financial

"15000 | 07/28/2026 | Broker Payment for Cashless Exercise"

Form 144 regulatory

"144: Securities To Be Sold"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

FAQ

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

What transaction does SEIC's Form 144 filing report?

The Form 144 for SEIC reports activity related to 15,000 shares of SEI Investments Co. common stock tied to an Employee Stock Option Exercise using a Broker Payment for Cashless Exercise dated 07/28/2026.

How many SEIC shares are covered in the new Form 144 notice?

The filing covers 15,000 shares of SEI Investments Co. common stock. These shares are associated with an Employee Stock Option Exercise and will be handled through Charles Schwab & Co., Inc. as the broker.

What is the reported dollar value of the 15,000 SEIC shares in the Form 144?

The 15,000 SEIC shares have a reported aggregate value of $1,535,187.00. This figure appears in the securities information section and reflects the value associated with the planned broker-handled option exercise transaction.

Who is the reporting person in SEIC's Form 144 and what is their address?

The reporting person is Mark Andrew Warner, with a listed address of 1 VALLEY DRIVE, OAKS, PA 19456-1100. The notice relates to transactions in SEI Investments Co. common stock.

What prior SEIC stock sale is disclosed in the past 3 months section?

The filing discloses that on 04/28/2026, 4,000 shares of SEI Investments Co. common stock were sold for $364,640.00. This is listed under securities sold during the past three months.

Which broker is involved in the SEIC Form 144 transaction and what method is used?

The broker is Charles Schwab & Co., Inc., located at 3000 Schwab Way, Westlake, TX 76262. The method is described as Broker Payment for Cashless Exercise tied to an employee stock option exercise.

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	0001972425
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 CO
SEC File Number	000-10200
Address of Issuer	1 FREEDOM VALLEY DRIVE OAKS PENNSYLVANIA 19456-1100
Phone	6106761000
Name of Person for Whose Account the Securities are To Be Sold	Warner Mark Andrew
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	Officer

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	Charles Schwab & Co., Inc. 3000 Schwab Way Westlake TX 76262	15000	1535187.00	120019182	07/28/2026	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	07/28/2026	Employee Stock Option Exercise	SEI INVESTMENTS CO			15000	07/28/2026	Broker Payment for Cashless Exercise

* 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

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Mark Andrew Warner 1 FREEDOM VALLEY DRIVE OAKS PA 19456-1100	SEI INVESTMENTS CO	04/28/2026	4000	364640.00

144: Remarks and Signature

Remarks
Date of Notice	07/28/2026
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	Mark Andrew Warner
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)