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SEI Investments (SEIC) chair emeritus trims 57,332-share stake

Filing Impact
(Very High)
Filing Sentiment
(Very Negative)
Form Type
4

Rhea-AI Filing Summary

SEI Investments Co. Chairman Emeritus Alfred P. West Jr. reported open-market sales of 57,332 shares of SEI common stock on June 26 and June 29, 2026. The reported sale prices were based on weighted-average trade prices ranging from about $86.60 to $88.37 per share.

After these transactions, West directly holds 6,818,451 shares of SEI common stock, indicating that the sales represent a relatively small portion of his overall position.

Positive

  • None.

Negative

  • None.
Insider WEST ALFRED P JR
Role null
Sold 57,332 shs ($5.00M)
Type Security Shares Price Value
Sale Common Stock 5,652 $87.18 $493K
Sale Common Stock 1,680 $88.09 $148K
Sale Common Stock 46,162 $87.21 $4.03M
Sale Common Stock 3,838 $87.67 $336K
Holdings After Transaction: Common Stock — 6,820,131 shares (Direct, null)
Footnotes (1)
  1. Represents the weighted average of a range of sale prices from $86.60 to $87.59. 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. Represents the weighted average of a range of sale prices from $87.60 to $88.07. 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. Represents the weighted average of a range of sale prices from $86.78 to $87.75. 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. Represents the weighted average of a range of sale prices from $87.82 to $88.37. 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.
Shares sold 57,332 shares Total net shares sold across four open-market transactions
Holding after transactions 6,818,451 shares Direct SEI Investments common stock held after June 29, 2026
Example sale price $88.09 per share One June 29, 2026 open-market sale of 1,680 shares
Largest single sale 46,162 shares Open-market sale at $87.21 per share on June 26, 2026
Price range footnote 1 $86.60–$87.59 Weighted-average sale price range for one group of trades
Price range footnote 4 $87.82–$88.37 Weighted-average sale price range for another trade group
open-market sale financial
"transaction_action: "open-market sale" for each common stock transaction"
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.
weighted average financial
"Represents the 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.
Common Stock financial
"security_title: "Common Stock" for all reported transactions"
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.
Sale in open market or private transaction financial
"transaction_code_description: "Sale in open market or private transaction""
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Form 4 Insider Transactions: What Each Field Means →
SEC Form 4
FORM 4UNITED 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*
WEST ALFRED P JR
(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)
Director10% Owner
Officer (give title below)XOther (specify below)
Chairman Emeritus
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
06/26/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock06/26/2026S46,162D$87.21(1)6,829,621D
Common Stock06/26/2026S3,838D$87.67(2)6,825,783D
Common Stock06/29/2026S5,652D$87.18(3)6,820,131D
Common Stock06/29/2026S1,680D$88.09(4)6,818,451D
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
1. Represents the weighted average of a range of sale prices from $86.60 to $87.59. 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. Represents the weighted average of a range of sale prices from $87.60 to $88.07. 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.
3. Represents the weighted average of a range of sale prices from $86.78 to $87.75. 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.
4. Represents the weighted average of a range of sale prices from $87.82 to $88.37. 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.
Remarks:
/s/ Alfred P. West, Jr., by Diane Gallagher, attorney in fact06/29/2026
** Signature of Reporting PersonDate
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

How many SEI Investments (SEIC) shares did Alfred P. West Jr. sell?

Alfred P. West Jr. sold a total of 57,332 SEI Investments common shares. These sales occurred over two days and were executed in multiple open-market transactions at different weighted-average prices.

What prices did Alfred P. West Jr. receive for his SEIC share sales?

The reported transactions used weighted-average sale prices between roughly $86.60 and $88.37 per share. Detailed trade-by-trade pricing within those ranges is available on request from the company, regulators, or shareholders.

What is Alfred P. West Jr.’s SEIC shareholding after these Form 4 sales?

Following the reported transactions, Alfred P. West Jr. directly holds 6,818,451 shares of SEI Investments common stock. This remaining stake shows he retains a large ongoing equity interest in the company after the sales.

On what dates did Alfred P. West Jr. sell SEI Investments (SEIC) shares?

The Form 4 shows that Alfred P. West Jr. sold SEI Investments common stock on June 26, 2026 and June 29, 2026. The activity was split across four separately reported open-market sale transactions.

Were Alfred P. West Jr.’s SEIC transactions open-market sales?

Yes. Each transaction is coded as “S” with the description “Sale in open market or private transaction”. The Form 4 characterizes them as open-market sales of SEI Investments common stock rather than option exercises or gifts.