Sei Investments Co SEC filings SEIC
Sei Investments Co has 1,001 filings in SEC EDGAR's recent list, going back to Mar 18, 2014. Its latest annual report, Form ARS, was filed on Apr 15, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Oct 26, 2026, covering the quarter ended Sep 30, 2026. The most recent current report (Form 8-K) was filed on Oct 21, 2026 (results of operations, regulation fd disclosure, other events). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 4 | Insider transaction | Nov 5, 2026 | Nov 4, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Oct 27, 2026 | — |
| 10-Q | Quarterly report | Oct 26, 2026 | Sep 30, 2026 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Oct 21, 2026 | Oct 21, 2026 |
| 4 | Insider transaction | Oct 1, 2026 | Sep 29, 2026 |
| 144 | Notice of proposed sale | Sep 29, 2026 | — |
| 4 | Insider transaction | Sep 24, 2026 | Sep 22, 2026 |
| 144 | Notice of proposed sale | Sep 22, 2026 | — |
| 4 | Insider transaction | Sep 8, 2026 | Sep 3, 2026 |
| 4 | Insider transaction | Sep 3, 2026 | Sep 1, 2026 |
| 144 | Notice of proposed sale | Sep 3, 2026 | — |
| 144 | Notice of proposed sale | Sep 1, 2026 | — |
| 4 | Insider transaction | Sep 1, 2026 | Aug 28, 2026 |
| 144 | Notice of proposed sale | Aug 28, 2026 | — |
| N-PX | Filing | Aug 27, 2026 | Jun 30, 2026 |
| 13F-HR | Filing | Aug 14, 2026 | Jun 30, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 7, 2026 | — |
| 4 | Insider transaction | Aug 6, 2026 | Aug 4, 2026 |
| 144 | Notice of proposed sale | Aug 5, 2026 | — |
| 144 | Notice of proposed sale | Aug 4, 2026 | — |
| 4 | Insider transaction | Aug 4, 2026 | Aug 3, 2026 |
| 144 | Notice of proposed sale | Aug 3, 2026 | — |
| 4 | Insider transaction | Jul 30, 2026 | Jul 28, 2026 |
| 4 | Insider transaction | Jul 30, 2026 | Jul 28, 2026 |
| 4 | Insider transaction | Jul 30, 2026 | Jul 28, 2026 |
| 144 | Notice of proposed sale | Jul 28, 2026 | — |
| 144 | Notice of proposed sale | Jul 28, 2026 | — |
| 144 | Notice of proposed sale | Jul 28, 2026 | — |
| 4 | Insider transaction | Jul 28, 2026 | Jul 24, 2026 |
| 4 | Insider transaction | Jul 28, 2026 | Jul 24, 2026 |
| 10-Q | Quarterly report | Jul 27, 2026 | Jun 30, 2026 |
| 144 | Notice of proposed sale | Jul 24, 2026 | — |
| 3 | Initial insider ownership | Jul 23, 2026 | May 26, 2026 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Jul 22, 2026 | Jul 22, 2026 |
| 4 | Insider transaction | Jun 29, 2026 | Jun 26, 2026 |
| 144 | Notice of proposed sale | Jun 26, 2026 | — |
| 11-K | Employee savings plan report | Jun 23, 2026 | Dec 31, 2025 |
| 4 | Insider transaction | Jun 11, 2026 | Jun 9, 2026 |
| 144 | Notice of proposed sale | Jun 9, 2026 | — |
| 8-K |
Current report
Shareholder vote results, Other events
|
May 28, 2026 | May 27, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 14, 2026 | — |
| 13F-HR | Filing | May 13, 2026 | Mar 31, 2026 |
| 4 | Insider transaction | May 5, 2026 | May 4, 2026 |
| 144 | Notice of proposed sale | May 4, 2026 | — |
| 4 | Insider transaction | Apr 30, 2026 | Apr 28, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Apr 29, 2026 | — |
| 144 | Notice of proposed sale | Apr 28, 2026 | — |
| 10-Q | Quarterly report | Apr 27, 2026 | Mar 31, 2026 |
| 4 | Insider transaction | Apr 24, 2026 | Apr 23, 2026 |
| 4 | Insider transaction | Apr 23, 2026 | Apr 23, 2026 |
| 4 | Insider transaction | Apr 23, 2026 | Apr 23, 2026 |
| 144 | Notice of proposed sale | Apr 23, 2026 | — |
| 144 | Notice of proposed sale | Apr 23, 2026 | — |
| 144 | Notice of proposed sale | Apr 23, 2026 | — |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Apr 22, 2026 | Apr 22, 2026 |
| ARS | Annual report to shareholders | Apr 15, 2026 | Dec 31, 2025 |
| DEF 14A | Proxy statement | Apr 15, 2026 | May 27, 2026 |
| 4/A | Form 4/a | Apr 1, 2026 | Mar 31, 2026 |
| 4 | Insider transaction | Apr 1, 2026 | Mar 31, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Mar 27, 2026 | — |
| 4 | Insider transaction | Mar 19, 2026 | Mar 18, 2026 |
| 4 | Insider transaction | Mar 12, 2026 | Mar 10, 2026 |
| 144 | Notice of proposed sale | Mar 10, 2026 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Mar 2, 2026 | Mar 2, 2026 |
| 4 | Insider transaction | Feb 26, 2026 | Feb 25, 2026 |
| 144 | Notice of proposed sale | Feb 25, 2026 | — |
| 10-K | Annual report | Feb 23, 2026 | Dec 31, 2025 |
| 13F-HR | Filing | Feb 13, 2026 | Dec 31, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 12, 2026 | — |
| 4 | Insider transaction | Feb 2, 2026 | Jan 29, 2026 |
| 144 | Notice of proposed sale | Jan 29, 2026 | — |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Jan 28, 2026 | Jan 28, 2026 |
| 8-K |
Current report
Officer or director change
|
Jan 15, 2026 | Jan 13, 2026 |
| 4 | Insider transaction | Jan 2, 2026 | Jan 1, 2026 |
| 4 | Insider transaction | Dec 30, 2025 | Dec 30, 2025 |
| 4 | Insider transaction | Dec 29, 2025 | Dec 5, 2025 |
| 4 | Insider transaction | Dec 29, 2025 | Dec 5, 2025 |
| 4 | Insider transaction | Dec 29, 2025 | Dec 5, 2025 |
| 4 | Insider transaction | Dec 29, 2025 | Dec 5, 2025 |
| 4 | Insider transaction | Dec 29, 2025 | Dec 5, 2025 |
| 4 | Insider transaction | Dec 23, 2025 | Dec 22, 2025 |
| 144 | Notice of proposed sale | Dec 22, 2025 | — |
| 8-K |
Current report
Officer or director change, Other events
|
Dec 17, 2025 | Dec 12, 2025 |
| 4 | Insider transaction | Dec 16, 2025 | Dec 12, 2025 |
| 4 | Insider transaction | Dec 16, 2025 | Dec 12, 2025 |
| 4 | Insider transaction | Dec 16, 2025 | Dec 12, 2025 |
| 4 | Insider transaction | Dec 16, 2025 | Dec 12, 2025 |
| 4 | Insider transaction | Dec 16, 2025 | Dec 12, 2025 |
| 4 | Insider transaction | Dec 16, 2025 | Dec 12, 2025 |
| 4 | Insider transaction | Dec 16, 2025 | Dec 12, 2025 |
| 4 | Insider transaction | Dec 16, 2025 | Dec 12, 2025 |
| 4 | Insider transaction | Dec 16, 2025 | Dec 12, 2025 |
| 4 | Insider transaction | Dec 16, 2025 | Dec 12, 2025 |
| 4 | Insider transaction | Dec 16, 2025 | Dec 12, 2025 |
| 4 | Insider transaction | Dec 16, 2025 | Dec 12, 2025 |
| 4 | Insider transaction | Dec 16, 2025 | Dec 12, 2025 |
| 4 | Insider transaction | Dec 8, 2025 | Dec 4, 2025 |
| 4 | Insider transaction | Dec 5, 2025 | Dec 3, 2025 |
| 144 | Notice of proposed sale | Dec 4, 2025 | — |
| 144 | Notice of proposed sale | Dec 3, 2025 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Dec 3, 2025 | Dec 3, 2025 |
| 4 | Insider transaction | Nov 18, 2025 | Nov 17, 2025 |
| 13F-HR | Filing | Nov 13, 2025 | Sep 30, 2025 |
| 4 | Insider transaction | Nov 13, 2025 | Nov 12, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 13, 2025 | — |
| 144 | Notice of proposed sale | Nov 12, 2025 | — |
| 144 | Notice of proposed sale | Nov 12, 2025 | — |
| 4 | Insider transaction | Nov 12, 2025 | Nov 11, 2025 |
| 4 | Insider transaction | Oct 28, 2025 | Oct 24, 2025 |
| 10-Q | Quarterly report | Oct 27, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Other events
|
Oct 24, 2025 | Oct 20, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Oct 22, 2025 | Oct 22, 2025 |
| 4 | Insider transaction | Sep 29, 2025 | Sep 29, 2025 |
| 144 | Notice of proposed sale | Sep 29, 2025 | — |
| 4 | Insider transaction | Sep 24, 2025 | Sep 23, 2025 |
| 144 | Notice of proposed sale | Sep 23, 2025 | — |
| 144 | Notice of proposed sale | Sep 22, 2025 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Sep 18, 2025 | Sep 18, 2025 |
| 4 | Insider transaction | Sep 17, 2025 | Sep 16, 2025 |
| N-PX | Filing | Aug 25, 2025 | Jun 30, 2025 |
| 4 | Insider transaction | Aug 20, 2025 | Aug 19, 2025 |
| 144 | Notice of proposed sale | Aug 19, 2025 | — |
| 8-K |
Current report
Material agreement, New debt
|
Aug 19, 2025 | Aug 18, 2025 |
| 13F-HR | Filing | Aug 14, 2025 | Jun 30, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 13, 2025 | — |
| 4 | Insider transaction | Aug 8, 2025 | Aug 7, 2025 |
| 4 | Insider transaction | Aug 6, 2025 | Aug 5, 2025 |
| 4 | Insider transaction | Aug 4, 2025 | Jul 31, 2025 |
| 144 | Notice of proposed sale | Jul 31, 2025 | — |
| 4 | Insider transaction | Jul 30, 2025 | Jul 29, 2025 |
| 144 | Notice of proposed sale | Jul 29, 2025 | — |
| 10-Q | Quarterly report | Jul 28, 2025 | Jun 30, 2025 |
| 4 | Insider transaction | Jul 24, 2025 | Jul 22, 2025 |
| 3 | Initial insider ownership | Jul 24, 2025 | Jul 22, 2025 |
| 4 | Insider transaction | Jul 24, 2025 | Jul 22, 2025 |
| 3 | Initial insider ownership | Jul 24, 2025 | Jul 22, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Jul 23, 2025 | Jul 23, 2025 |
| 8-K |
Current report
Officer or director change
|
Jul 22, 2025 | Jul 16, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Jul 18, 2025 | Jul 17, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jul 16, 2025 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Jul 1, 2025 | Jun 30, 2025 |
| 11-K | Employee savings plan report | Jun 24, 2025 | Dec 31, 2024 |
| 8-K |
Current report
Regulation FD disclosure
|
Jun 5, 2025 | Jun 5, 2025 |
| 4 | Insider transaction | May 30, 2025 | May 28, 2025 |
| 144 | Notice of proposed sale | May 28, 2025 | — |
| 8-K |
Current report
Shareholder vote results, Other events
|
May 28, 2025 | May 28, 2025 |
| 4 | Insider transaction | May 16, 2025 | May 14, 2025 |
| 4 | Insider transaction | May 16, 2025 | May 15, 2025 |
| 4 | Insider transaction | May 16, 2025 | May 14, 2025 |
| 144 | Notice of proposed sale | May 15, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2025 | — |
| 144 | Notice of proposed sale | May 14, 2025 | — |
| 144 | Notice of proposed sale | May 14, 2025 | — |
| 13F-HR/A | Filing | May 14, 2025 | Mar 31, 2025 |
| 13F-HR | Filing | May 13, 2025 | Mar 31, 2025 |
| DEFA14A | Additional proxy material | May 7, 2025 | — |
| 10-Q | Quarterly report | Apr 28, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Apr 23, 2025 | Apr 23, 2025 |
| ARS | Annual report to shareholders | Apr 14, 2025 | Dec 31, 2024 |
| DEF 14A | Proxy statement | Apr 14, 2025 | May 28, 2025 |
| 4 | Insider transaction | Apr 1, 2025 | Mar 31, 2025 |
| 4 | Insider transaction | Mar 19, 2025 | Mar 18, 2025 |
| 8-K |
Current report
Other events
|
Mar 18, 2025 | Mar 18, 2025 |
| 4 | Insider transaction | Mar 7, 2025 | Mar 5, 2025 |
| 4 | Insider transaction | Mar 5, 2025 | Mar 3, 2025 |
| 4 | Insider transaction | Mar 5, 2025 | Mar 3, 2025 |
| 144 | Notice of proposed sale | Mar 3, 2025 | — |
| 144 | Notice of proposed sale | Mar 3, 2025 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Feb 27, 2025 | Feb 27, 2025 |
| 8-K |
Current report
Officer or director change
|
Feb 25, 2025 | Feb 25, 2025 |
| 10-K | Annual report | Feb 20, 2025 | Dec 31, 2024 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 12, 2025 | — |
| 13F-HR | Filing | Feb 11, 2025 | Dec 31, 2024 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Jan 29, 2025 | Jan 29, 2025 |
| 8-K/A |
Amended current report
Regulation FD disclosure
|
Jan 17, 2025 | Jan 14, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Jan 14, 2025 | Jan 14, 2025 |
| 4 | Insider transaction | Jan 3, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Jan 2, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Dec 17, 2024 | Dec 13, 2024 |
| 4 | Insider transaction | Dec 16, 2024 | Dec 12, 2024 |
| 4 | Insider transaction | Dec 16, 2024 | Dec 12, 2024 |
| 4 | Insider transaction | Dec 16, 2024 | Dec 12, 2024 |
| 4 | Insider transaction | Dec 16, 2024 | Dec 12, 2024 |
| 4 | Insider transaction | Dec 16, 2024 | Dec 12, 2024 |
| 4 | Insider transaction | Dec 16, 2024 | Dec 12, 2024 |
| 4 | Insider transaction | Dec 16, 2024 | Dec 12, 2024 |
| 4 | Insider transaction | Dec 16, 2024 | Dec 12, 2024 |
| 4 | Insider transaction | Dec 16, 2024 | Dec 12, 2024 |
| 4 | Insider transaction | Dec 16, 2024 | Dec 12, 2024 |
| 4 | Insider transaction | Dec 16, 2024 | Dec 12, 2024 |
| 4 | Insider transaction | Dec 16, 2024 | Dec 12, 2024 |
| 4 | Insider transaction | Dec 16, 2024 | Dec 12, 2024 |
| 144 | Notice of proposed sale | Dec 13, 2024 | — |
| 144 | Notice of proposed sale | Dec 12, 2024 | — |
| 8-K |
Current report
Other events
|
Dec 12, 2024 | Dec 12, 2024 |
| 8-K |
Current report
Regulation FD disclosure
|
Dec 11, 2024 | Dec 10, 2024 |
| 4 | Insider transaction | Dec 6, 2024 | Dec 4, 2024 |
| 144 | Notice of proposed sale | Dec 6, 2024 | — |
| 144 | Notice of proposed sale | Dec 4, 2024 | — |
Showing 200 filings, the most recent 200. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
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Company profile
- Industry
- Security Brokers, Dealers & Flotation Companies (SIC 6211)
- Listed as
- SEIC (Nasdaq)
- Fiscal year ends
- December 31
- Incorporated in
- PA
- Headquarters
- Oaks, PA
- SEC filer status
- Large accelerated filer
- SEC CIK
- 350894
- Former names
- SEI CORP (until Aug 5, 2004)
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All 34 Security Brokers, Dealers & Flotation Companies companies
Source: SEC EDGAR filings. This is company-reported data, not investment advice.