Trinseo PLC SEC filings TSEOQ
Trinseo PLC has 1,001 filings in SEC EDGAR's recent list, going back to Jun 15, 2015. Its latest annual report, Form ARS, was filed on Aug 7, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Aug 6, 2026, covering the quarter ended Jun 30, 2026. The most recent current report (Form 8-K) was filed on Oct 27, 2026 (other events). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Oct 27, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2026 | — |
| 4 | Insider transaction | May 14, 2026 | May 12, 2026 |
| 4 | Insider transaction | May 14, 2026 | May 12, 2026 |
| 4 | Insider transaction | May 14, 2026 | May 12, 2026 |
| 4 | Insider transaction | May 14, 2026 | May 12, 2026 |
| 4 | Insider transaction | May 14, 2026 | May 12, 2026 |
| 4 | Insider transaction | May 14, 2026 | May 12, 2026 |
| 4 | Insider transaction | May 14, 2026 | May 12, 2026 |
| 4 | Insider transaction | May 14, 2026 | May 12, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Feb 24, 2026 | Feb 21, 2026 |
| 4 | Insider transaction | Feb 24, 2026 | Feb 21, 2026 |
| 4 | Insider transaction | Feb 24, 2026 | Feb 21, 2026 |
| 4 | Insider transaction | Feb 24, 2026 | Feb 21, 2026 |
| 4 | Insider transaction | Feb 24, 2026 | Feb 21, 2026 |
| 4 | Insider transaction | Feb 24, 2026 | Feb 21, 2026 |
| 4 | Insider transaction | Feb 24, 2026 | Feb 21, 2026 |
| 4 | Insider transaction | Feb 24, 2026 | Feb 21, 2026 |
| 4 | Insider transaction | Feb 24, 2026 | Feb 22, 2026 |
| 4 | Insider transaction | Feb 24, 2026 | Feb 21, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 17, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Feb 12, 2026 | — |
| 3 | Initial insider ownership | Jan 20, 2026 | Jan 16, 2026 |
| 3 | Initial insider ownership | Jan 20, 2026 | Jan 16, 2026 |
| 4 | Insider transaction | Oct 7, 2025 | Oct 3, 2025 |
| 4 | Insider transaction | Oct 2, 2025 | Sep 30, 2025 |
| 4 | Insider transaction | Sep 29, 2025 | Sep 25, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2025 | — |
| 4 | Insider transaction | Aug 14, 2025 | Aug 12, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Jul 17, 2025 | — |
| 4 | Insider transaction | Jun 27, 2025 | Jun 25, 2025 |
| 4 | Insider transaction | Jun 27, 2025 | Jun 25, 2025 |
| 4 | Insider transaction | Jun 27, 2025 | Jun 25, 2025 |
| 4 | Insider transaction | Jun 27, 2025 | Jun 25, 2025 |
| 4 | Insider transaction | Jun 27, 2025 | Jun 25, 2025 |
| 4 | Insider transaction | Jun 27, 2025 | Jun 25, 2025 |
| 4 | Insider transaction | Jun 27, 2025 | Jun 25, 2025 |
| 4 | Insider transaction | Jun 27, 2025 | Jun 25, 2025 |
| 4/A | Filing | Jun 27, 2025 | Jun 21, 2025 |
| 4 | Insider transaction | Jun 24, 2025 | Jun 21, 2025 |
| 4 | Insider transaction | Jun 24, 2025 | Jun 21, 2025 |
| 4 | Insider transaction | Jun 24, 2025 | Jun 21, 2025 |
| 4 | Insider transaction | Jun 24, 2025 | Jun 21, 2025 |
| 4 | Insider transaction | Jun 24, 2025 | Jun 21, 2025 |
| 4 | Insider transaction | Jun 24, 2025 | Jun 21, 2025 |
| 4 | Insider transaction | Jun 24, 2025 | Jun 21, 2025 |
| 4 | Insider transaction | Jun 24, 2025 | Jun 21, 2025 |
| 4 | Insider transaction | Jun 24, 2025 | Jun 21, 2025 |
| 4 | Insider transaction | Jun 24, 2025 | Jun 21, 2025 |
| 4 | Insider transaction | Mar 14, 2025 | Mar 12, 2025 |
| 4 | Insider transaction | Mar 3, 2025 | Feb 27, 2025 |
| 4 | Insider transaction | Mar 3, 2025 | Feb 27, 2025 |
| 4 | Insider transaction | Mar 3, 2025 | Feb 27, 2025 |
| 4 | Insider transaction | Mar 3, 2025 | Feb 27, 2025 |
| 4 | Insider transaction | Mar 3, 2025 | Feb 27, 2025 |
| 4 | Insider transaction | Mar 3, 2025 | Feb 27, 2025 |
| 4 | Insider transaction | Mar 3, 2025 | Feb 27, 2025 |
| 4 | Insider transaction | Mar 3, 2025 | Feb 27, 2025 |
| 4 | Insider transaction | Mar 3, 2025 | Feb 27, 2025 |
| 4 | Insider transaction | Mar 3, 2025 | Feb 27, 2025 |
| 4 | Insider transaction | Feb 25, 2025 | Feb 21, 2025 |
| 4 | Insider transaction | Feb 25, 2025 | Feb 21, 2025 |
| 4 | Insider transaction | Feb 25, 2025 | Feb 21, 2025 |
| 4 | Insider transaction | Feb 25, 2025 | Feb 21, 2025 |
| 4 | Insider transaction | Feb 25, 2025 | Feb 21, 2025 |
| 4 | Insider transaction | Feb 25, 2025 | Feb 21, 2025 |
| 4 | Insider transaction | Feb 25, 2025 | Feb 21, 2025 |
| 4 | Insider transaction | Feb 25, 2025 | Feb 21, 2025 |
| 4 | Insider transaction | Feb 25, 2025 | Feb 21, 2025 |
| 4 | Insider transaction | Feb 25, 2025 | Feb 21, 2025 |
| 4 | Insider transaction | Feb 25, 2025 | Feb 22, 2025 |
| 4 | Insider transaction | Feb 18, 2025 | Feb 16, 2025 |
| 4 | Insider transaction | Feb 18, 2025 | Feb 16, 2025 |
| 4 | Insider transaction | Feb 18, 2025 | Feb 16, 2025 |
| 4 | Insider transaction | Feb 18, 2025 | Feb 16, 2025 |
| 4 | Insider transaction | Feb 18, 2025 | Feb 16, 2025 |
| 4 | Insider transaction | Feb 18, 2025 | Feb 16, 2025 |
| 4 | Insider transaction | Feb 18, 2025 | Feb 16, 2025 |
| 4 | Insider transaction | Feb 18, 2025 | Feb 16, 2025 |
| SC 13G | Ownership over 5% (passive) | Dec 17, 2024 | — |
| 4 | Insider transaction | Dec 3, 2024 | Nov 29, 2024 |
| SC 13G | Ownership over 5% (passive) | Nov 14, 2024 | — |
| 4 | Insider transaction | Oct 7, 2024 | Oct 3, 2024 |
| 4 | Insider transaction | Sep 27, 2024 | Sep 25, 2024 |
| 4 | Insider transaction | Sep 24, 2024 | Sep 21, 2024 |
| 4 | Insider transaction | Aug 20, 2024 | Aug 16, 2024 |
| 4 | Insider transaction | Aug 14, 2024 | Aug 13, 2024 |
| 4 | Insider transaction | Aug 14, 2024 | Aug 12, 2024 |
| 4 | Insider transaction | Aug 14, 2024 | Aug 12, 2024 |
| 144 | Notice of proposed sale | Aug 13, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jul 8, 2024 | — |
| 4 | Insider transaction | Jun 25, 2024 | Jun 21, 2024 |
| 4 | Insider transaction | Jun 25, 2024 | Jun 21, 2024 |
| 4 | Insider transaction | Jun 25, 2024 | Jun 21, 2024 |
| 4 | Insider transaction | Jun 25, 2024 | Jun 21, 2024 |
| 4 | Insider transaction | Jun 25, 2024 | Jun 21, 2024 |
| 4 | Insider transaction | Jun 25, 2024 | Jun 21, 2024 |
| 4 | Insider transaction | Jun 25, 2024 | Jun 21, 2024 |
| 4 | Insider transaction | Jun 25, 2024 | Jun 21, 2024 |
| 4 | Insider transaction | Jun 25, 2024 | Jun 21, 2024 |
| 4 | Insider transaction | Jun 25, 2024 | Jun 21, 2024 |
| 4 | Insider transaction | Jun 18, 2024 | Jun 14, 2024 |
| 4 | Insider transaction | Jun 18, 2024 | Jun 14, 2024 |
| 4 | Insider transaction | Jun 18, 2024 | Jun 14, 2024 |
| 4 | Insider transaction | Jun 18, 2024 | Jun 14, 2024 |
| 4 | Insider transaction | Jun 18, 2024 | Jun 14, 2024 |
| 4 | Insider transaction | Jun 18, 2024 | Jun 14, 2024 |
| 4 | Insider transaction | Jun 18, 2024 | Jun 14, 2024 |
| 4 | Insider transaction | Jun 18, 2024 | Jun 14, 2024 |
| 4 | Insider transaction | Jun 18, 2024 | Jun 14, 2024 |
| 4 | Insider transaction | Jun 18, 2024 | Jun 14, 2024 |
| 3 | Initial insider ownership | Mar 5, 2024 | Mar 1, 2024 |
| 4 | Insider transaction | Feb 27, 2024 | Nov 29, 2023 |
| 4 | Insider transaction | Feb 27, 2024 | Oct 3, 2023 |
| 4 | Insider transaction | Feb 23, 2024 | Feb 22, 2024 |
| 4 | Insider transaction | Feb 23, 2024 | Feb 21, 2024 |
| 4 | Insider transaction | Feb 23, 2024 | Feb 21, 2024 |
| 4 | Insider transaction | Feb 23, 2024 | Feb 21, 2024 |
| 4 | Insider transaction | Feb 23, 2024 | Feb 21, 2024 |
| 4 | Insider transaction | Feb 23, 2024 | Feb 21, 2024 |
| 4 | Insider transaction | Feb 23, 2024 | Feb 21, 2024 |
| 4 | Insider transaction | Feb 23, 2024 | Feb 21, 2024 |
| 4 | Insider transaction | Feb 23, 2024 | Feb 21, 2024 |
| 4 | Insider transaction | Feb 23, 2024 | Feb 21, 2024 |
| 4 | Insider transaction | Feb 21, 2024 | Feb 17, 2024 |
| 4 | Insider transaction | Feb 21, 2024 | Feb 17, 2024 |
| 4 | Insider transaction | Feb 21, 2024 | Feb 17, 2024 |
| 4 | Insider transaction | Feb 21, 2024 | Feb 17, 2024 |
| 4 | Insider transaction | Feb 21, 2024 | Feb 17, 2024 |
| 4 | Insider transaction | Feb 21, 2024 | Feb 17, 2024 |
| 4 | Insider transaction | Feb 21, 2024 | Feb 17, 2024 |
| 4 | Insider transaction | Feb 21, 2024 | Feb 17, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 6, 2024 | — |
| 4 | Insider transaction | Dec 18, 2023 | Dec 14, 2023 |
| SC 13G/A | Amended ownership over 5% (passive) | Oct 6, 2023 | — |
| 3 | Initial insider ownership | Sep 26, 2023 | Sep 25, 2023 |
| 4 | Insider transaction | Sep 26, 2023 | Sep 25, 2023 |
| 4 | Insider transaction | Sep 18, 2023 | Sep 14, 2023 |
| 4 | Insider transaction | Sep 13, 2023 | Sep 13, 2023 |
| 4 | Insider transaction | Sep 13, 2023 | Sep 12, 2023 |
| 4 | Insider transaction | Sep 13, 2023 | Sep 12, 2023 |
| 4 | Insider transaction | Sep 13, 2023 | Sep 12, 2023 |
| 4/A | Filing | Jul 13, 2023 | Jun 14, 2023 |
| 4/A | Filing | Jul 13, 2023 | Jun 14, 2023 |
| 4/A | Filing | Jul 13, 2023 | Jun 14, 2023 |
| 4/A | Filing | Jul 13, 2023 | Jun 14, 2023 |
| 4/A | Filing | Jul 13, 2023 | Jun 14, 2023 |
| 4/A | Filing | Jul 13, 2023 | Jun 14, 2023 |
| 4/A | Filing | Jul 13, 2023 | Jun 14, 2023 |
| 4/A | Filing | Jul 13, 2023 | Jun 14, 2023 |
| 4/A | Filing | Jul 13, 2023 | Jun 14, 2023 |
| 4/A | Filing | Jul 13, 2023 | Jun 14, 2023 |
| 4/A | Filing | Jul 13, 2023 | Jun 14, 2023 |
| 4 | Insider transaction | Jun 16, 2023 | Jun 14, 2023 |
| 4 | Insider transaction | Jun 16, 2023 | Jun 14, 2023 |
| 4 | Insider transaction | Jun 16, 2023 | Jun 14, 2023 |
| 4 | Insider transaction | Jun 16, 2023 | Jun 14, 2023 |
| 4 | Insider transaction | Jun 16, 2023 | Jun 14, 2023 |
| 4 | Insider transaction | Jun 16, 2023 | Jun 14, 2023 |
| 4 | Insider transaction | Jun 16, 2023 | Jun 14, 2023 |
| 4 | Insider transaction | Jun 16, 2023 | Jun 14, 2023 |
| 4 | Insider transaction | Jun 16, 2023 | Jun 14, 2023 |
| 4 | Insider transaction | Jun 16, 2023 | Jun 14, 2023 |
| 4 | Insider transaction | Jun 16, 2023 | Jun 14, 2023 |
| 4 | Insider transaction | Jun 16, 2023 | Jun 14, 2023 |
| 4 | Insider transaction | Apr 25, 2023 | Apr 21, 2023 |
| 4 | Insider transaction | Mar 13, 2023 | Mar 9, 2023 |
| 4 | Insider transaction | Mar 13, 2023 | Mar 9, 2023 |
| 4 | Insider transaction | Mar 13, 2023 | Mar 9, 2023 |
| 4 | Insider transaction | Mar 13, 2023 | Mar 9, 2023 |
| 4 | Insider transaction | Feb 28, 2023 | Feb 25, 2023 |
| 4 | Insider transaction | Feb 28, 2023 | Feb 25, 2023 |
| 4 | Insider transaction | Feb 28, 2023 | Feb 25, 2023 |
| 4 | Insider transaction | Feb 28, 2023 | Feb 25, 2023 |
| 4 | Insider transaction | Feb 28, 2023 | Feb 25, 2023 |
| 4 | Insider transaction | Feb 28, 2023 | Feb 25, 2023 |
| 4 | Insider transaction | Feb 28, 2023 | Feb 25, 2023 |
| 4 | Insider transaction | Feb 28, 2023 | Feb 25, 2023 |
| 4 | Insider transaction | Feb 28, 2023 | Feb 25, 2023 |
| 4 | Insider transaction | Feb 28, 2023 | Feb 25, 2023 |
| 4 | Insider transaction | Feb 24, 2023 | Feb 22, 2023 |
| 4 | Insider transaction | Feb 24, 2023 | Feb 22, 2023 |
| 4 | Insider transaction | Feb 24, 2023 | Feb 22, 2023 |
| 4 | Insider transaction | Feb 24, 2023 | Feb 22, 2023 |
| 4 | Insider transaction | Feb 24, 2023 | Feb 22, 2023 |
| 4 | Insider transaction | Feb 24, 2023 | Feb 22, 2023 |
| 4 | Insider transaction | Feb 24, 2023 | Feb 22, 2023 |
| 4 | Insider transaction | Feb 24, 2023 | Feb 22, 2023 |
| 4 | Insider transaction | Feb 24, 2023 | Feb 22, 2023 |
| 4 | Insider transaction | Feb 24, 2023 | Feb 22, 2023 |
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
- Plastic Materials, Synth Resins & Nonvulcan Elastomers (SIC 2821)
- Listed as
- TSEOQ (OTC)
- Fiscal year ends
- December 31
- Incorporated in
- Ireland
- Headquarters
- Wayne, PA
- SEC filer status
- Accelerated filer
- SEC CIK
- 1519061
- Former names
- Trinseo S.A. (until Oct 18, 2021)
Other Plastic Materials, Synth Resins & Nonvulcan Elastomers companies
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- DuPont de Nemours, Inc. DD
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- Eastman Chemical Co EMN
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All 12 Plastic Materials, Synth Resins & Nonvulcan Elastomers companies
Source: SEC EDGAR filings. This is company-reported data, not investment advice.