SEI Investments affiliate proposes sale of 35,000 shares

The notice lists earlier sales by West of 50,000 shares on June 28 and 7,332 shares on June 29, 2026.

Rhea-AI Filing Summary

SEI Investments Company affiliate Alfred P. West, Jr. reported a proposed sale of 35,000 common shares through J.P. Morgan Securities LLC as agent and attorney-in-fact, with an approximate sale date of September 29, 2026. The notice lists an aggregate market value of $3,668,700. The shares were acquired from the issuer in a private transaction on November 1, 2019.

Key Figures

Proposed shares to be sold: 35,000 common shares Aggregate market value: $3,668,700 Common shares outstanding: 120,019,182 shares +4 more

7 metrics

Proposed shares to be sold 35,000 common shares Approximate sale date September 29, 2026

Aggregate market value $3,668,700 Proposed sale

Common shares outstanding 120,019,182 shares Issuer share count listed with the proposed sale

Prior sale shares 50,000 common shares Sale reported for June 28, 2026

Reported value of prior sale $4,359,685.13 Sale reported for June 28, 2026

Prior sale shares 7,332 common shares Sale reported for June 29, 2026

Reported value of prior sale $640,741.28 Sale reported for June 29, 2026

Key Terms

Rule 144, Affiliate, Private Transaction, attorney-in-fact

4 terms

Rule 144 regulatory

"paragraph (a) of Rule 144"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Affiliate regulatory

"Affiliate"

Private Transaction financial

"Private Transaction"

A private transaction is the sale or transfer of securities, assets, or ownership stakes carried out directly between a small number of parties rather than on a public exchange. For investors it matters because these deals are less visible and often less liquid than public trades, so pricing can be harder to verify, the investment can be harder to sell quickly, and buyers or sellers may gain strategic advantages not available in open markets — like negotiated terms similar to a private garage sale versus a crowded marketplace.

attorney-in-fact regulatory

"as agent and attorney-in-fact for Alfred P. West, Jr."

An attorney-in-fact is the person or entity given legal authority through a power of attorney to act on behalf of another for specific tasks, such as signing documents, voting shares, or handling transactions. For investors, this matters because it lets a trusted representative make timely decisions or complete paperwork when the owner cannot, much like handing keys to someone to run errands on your behalf—so checks on scope and limits of that authority are important.

FAQ

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

How many SEIC shares did Alfred P. West plan to sell?

Alfred P. West, Jr., identified as an affiliate, reported a proposed sale of 35,000 common shares through J.P. Morgan Securities LLC, with an approximate sale date of September 29, 2026.

What were Alfred P. West's recent SEIC share sales?

The notice lists a sale of 50,000 common shares for $4,359,685.13 on June 28, 2026, and a sale of 7,332 common shares for $640,741.28 on June 29, 2026.

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

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Available on EDGAR 09/29/2026 - 04:10 PM Accepted by SEC EDGAR 09/29/2026 - 04:10 PM Learn about SEC filing dates

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	0001059374
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 Company
SEC File Number	000-10200
Address of Issuer	1 Freedom Valley Drive Oaks PENNSYLVANIA 19456
Phone	610-676-1000
Name of Person for Whose Account the Securities are To Be Sold	Alfred P. West, Jr.
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	Affiliate

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	J.P. Morgan Securities LLC 270 Park Avenue, 10th Floor New York NY 10017	35000	3668700	120019182	09/29/2026	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	11/01/2019	Private Transaction	Issuer			35000	11/01/2019	N/A

* 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
Alfred P. West Jr Care of SEI Investments Company 1 Freedom Valley Drive Oaks PA 19456	Common	06/28/2026	50000	4359685.13
Alfred P. West Jr Care of SEI Investments Company 1 Freedom Valley Drive Oaks PA 19456	Common	06/29/2026	7332	640741.28

144: Remarks and Signature

Remarks
Date of Notice	09/29/2026
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	J.P. Morgan Securities LLC as agent and attorney-in-fact for Alfred P. West, Jr.
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)