Alfred P. West Jr. - 03 Dec 2025 Form 4 Insider Report for SEI INVESTMENTS CO (SEIC)

Reporting relationship: Executive Chairman, Director
Issuer ticker: SEIC
Reported as of: 03 Dec 2025
Net transaction value: -$402,950
SEC form: 4
Accepted by SEC: 05 Dec 2025, 17:57:15 UTC
Prior SEC filing: 30 May 2025
Next SEC filing: 29 Dec 2025
Source filing: View source filing
Reporting owner signature: /s/ Alfred P. West, Jr., by Diane Gallagher, attorney in fact

Key filing fact

Alfred P. West Jr. filed Form 4 for SEI INVESTMENTS CO (SEIC) on 05 Dec 2025.

Key facts

This page summarizes Alfred P. West Jr.'s Form 4 filing for SEI INVESTMENTS CO (SEIC).
3 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 05 Dec 2025, 17:57.

Change

Previous filing in this sequence was filed on 30 May 2025.
Current net transaction value: -$402,950.

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: Executive Chairman, Director
Address: 1 FREEDOM VALLEY DRIVE, OAKS
Signature: /s/ Alfred P. West, Jr., by Diane Gallagher, attorney in fact
Signature date: 05 Dec 2025

Reported non-derivative transactions

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

SEIC transaction

Common Stock

Options Exercise

Transaction value: $1,600,200
Shares: +30,000
Change %: +0.43%
Price: $53.34
Shares after: 6,967,582
Date: 03 Dec 2025
Ownership: Direct

SEIC transaction

Common Stock

Sale

Transaction value: $2,003,150
Shares: -24,770
Change %: -0.36%
Price: $80.87
Shares after: 6,942,812
Date: 03 Dec 2025
Ownership: Direct
Footnotes: F1

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

SEIC transaction Derivative

STOCK OPTION (RIGHT TO PURCHASE)

Options Exercise

Transaction value
Shares: -30,000
Change %: -100%
Price
Shares after: 0
Date: 03 Dec 2025
Ownership: Direct
Underlying class: STOCK OPTION (RIGHT TO PURCHASE)
Underlying amount: 30,000
Exercise price: $53.34
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 $80.70 to $81.04. 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

Received as employment compensation.