SEC Form 4 · accession 0000929638-26-003408
SEI INVESTMENTS CO · SEIC
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Reporting owner
Michael Peterson
Officer — Executive Vice President
Period of report
Aug 28, 2026
Accepted (ET)
Sep 1, 2026 · 4:05 pm EDT
Rule 10b5-1 plan
box not checked
Issuer CIK
0000350894
Table I — non-derivative securities
| Security | Date | Code | Shares | Price | A/D | Owned after | D/I | Nature of ownership |
|---|---|---|---|---|---|---|---|---|
| Common Stock | Aug 28, 2026 | M | 37,500 | $56.54 | A | 57,648 | D | |
| Common StockF1 | Aug 28, 2026 | S | 37,500 | $111.51 | D | 20,148 | D | |
| Common StockF2 | holding | — | — | — | 454 | I | By Employee Stock Purchase Plan |
Table II — derivative securities
| Security | Conv. / exercise price | Date | Code | Shares | A/D | Exercisable | Expires | Underlying | Underlying shares | Owned after | D/I |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Option to Purchase Common StockF3 | $56.54 | Aug 28, 2026 | M | 37,500 | D | Dec 31, 2024 | Dec 8, 2030 | Common Stock | 37,500 | 0 | D |
Explanation of responses
- F1Represents the weighted average of a range of sale prices from $111.19 to $112.07. 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.
- F2Reflects the addition of approximately 91 shares purchased by the Reporting Person through the Company's Employee Stock Purchase Plan.
- F3Received as employment compensation.