Alfred P. West Jr. - 29 Sep 2026 Form 4 Insider Report for SEI INVESTMENTS CO (SEIC)

Reporting relationship: Chairman Emeritus
Issuer ticker: SEIC
Reported as of: 29 Sep 2026
Net transaction value: -$3,501,662
SEC form: 4
Accepted by SEC: 01 Oct 2026, 16:05:31 UTC
Prior SEC filing: 29 Jun 2026
Source filing: View source filing
Reporting owner signature: /s/ Alfred P. West, Jr., by Lindsay A. Barci, attorney in fact

Key filing fact

Alfred P. West Jr. filed Form 4 for SEI INVESTMENTS CO (SEIC) on 01 Oct 2026.

Key facts

This page summarizes Alfred P. West Jr.'s Form 4 filing for SEI INVESTMENTS CO (SEIC).
2 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 01 Oct 2026, 16:05.

Change

Previous filing in this sequence was filed on 29 Jun 2026.
Current net transaction value: -$3,501,662.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001059374 Primary reporting owner

WEST ALFRED P JR

Relationship: Chairman Emeritus
Address: 1 FREEDOM VALLEY DRIVE, OAKS
Signature: /s/ Alfred P. West, Jr., by Lindsay A. Barci, attorney in fact
Signature date: 01 Oct 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

SEIC transaction

Common Stock

Sale

Transaction value: $2,936,025
Shares: -28,394
Change %: -0.42%
Price: $103.40
Shares after: 6,790,057
Date: 29 Sep 2026
Ownership: Direct
Footnotes: F1

SEIC transaction

Common Stock

Sale

Transaction value: $565,637
Shares: -5,483
Change %: -0.08%
Price: $103.16
Shares after: 6,784,574
Date: 30 Sep 2026
Ownership: Direct
Footnotes: F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

Represents the weighted average of a range of sale prices from $103.17 to $103.67. 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.

Footnote F2

Represents the weighted average of a range of sale prices from $102.96 to $103.89. 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.