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 | — |
| 8-K |
Current report
Other events
|
Oct 27, 2026 | Oct 27, 2026 |
| 8-K |
Current report
Shareholder vote results, Other events
|
Sep 30, 2026 | Sep 30, 2026 |
| 8-K |
Current report
Shareholder vote results, Other events
|
Sep 23, 2026 | Sep 23, 2026 |
| 8-K |
Current report
Other events
|
Aug 14, 2026 | Aug 14, 2026 |
| ARS | Annual report to shareholders | Aug 7, 2026 | Dec 31, 2025 |
| DEFA14A | Additional proxy material | Aug 7, 2026 | — |
| DEF 14A | Proxy statement | Aug 7, 2026 | Sep 23, 2026 |
| 10-Q | Quarterly report | Aug 6, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations
|
Aug 6, 2026 | Aug 6, 2026 |
| 8-K |
Current report
Other events
|
Jul 17, 2026 | Jul 17, 2026 |
| 8-K/A | Amended current report | Jun 12, 2026 | May 28, 2026 |
| 8-K |
Current report
Material agreement, New debt
|
Jun 1, 2026 | May 28, 2026 |
| 8-K |
Current report
Bankruptcy, Regulation FD disclosure
|
May 26, 2026 | May 25, 2026 |
| SD | Specialized disclosure (conflict minerals) | May 22, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2026 | — |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
May 15, 2026 | 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 |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
May 14, 2026 | May 13, 2026 |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
Apr 30, 2026 | Apr 30, 2026 |
| 10-Q | Quarterly report | Apr 30, 2026 | Mar 31, 2026 |
| 8-K |
Current report
Results of operations
|
Apr 30, 2026 | Apr 30, 2026 |
| 10-K/A | Amended annual report | Apr 27, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Apr 15, 2026 | Apr 14, 2026 |
| 8-K |
Current report
Material agreement
|
Apr 13, 2026 | Apr 10, 2026 |
| 8-K |
Current report
Material agreement
|
Mar 20, 2026 | Mar 19, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
Mar 19, 2026 | Mar 19, 2026 |
| 25-NSE | Delisting notice | Mar 18, 2026 | — |
| 8-K |
Current report
Results of operations
|
Mar 13, 2026 | Mar 13, 2026 |
| 10-K | Annual report | Mar 13, 2026 | Dec 31, 2025 |
| 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 |
| 8-K |
Current report
Listing notice
|
Mar 3, 2026 | Mar 2, 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 | — |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
Feb 17, 2026 | Feb 16, 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 |
| 8-K |
Current report
Officer or director change
|
Jan 20, 2026 | Jan 16, 2026 |
| 8-K |
Current report
Officer or director change
|
Jan 12, 2026 | Jan 6, 2026 |
| 8-K |
Current report
Listing notice, Regulation FD disclosure, Other events
|
Dec 15, 2025 | Dec 12, 2025 |
| 8-K |
Current report
Exit or restructuring costs
|
Dec 10, 2025 | Dec 5, 2025 |
| 10-Q | Quarterly report | Nov 7, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Results of operations
|
Nov 6, 2025 | Nov 6, 2025 |
| 4 | Insider transaction | Oct 7, 2025 | Oct 3, 2025 |
| 8-K |
Current report
Exit or restructuring costs, Regulation FD disclosure
|
Oct 6, 2025 | Oct 6, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Oct 3, 2025 | Oct 3, 2025 |
| 4 | Insider transaction | Oct 2, 2025 | Sep 30, 2025 |
| 4 | Insider transaction | Sep 29, 2025 | Sep 25, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Aug 26, 2025 | Aug 26, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2025 | — |
| 4 | Insider transaction | Aug 14, 2025 | Aug 12, 2025 |
| S-8 | Employee stock plan registration | Aug 7, 2025 | — |
| 10-Q | Quarterly report | Aug 7, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Results of operations
|
Aug 6, 2025 | Aug 6, 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 |
| 8-K |
Current report
Shareholder vote results
|
Jun 26, 2025 | Jun 25, 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 |
| SD | Specialized disclosure (conflict minerals) | May 23, 2025 | — |
| 10-Q | Quarterly report | May 8, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Results of operations
|
May 7, 2025 | May 7, 2025 |
| ARS | Annual report to shareholders | Apr 29, 2025 | Dec 31, 2024 |
| DEFA14A | Additional proxy material | Apr 29, 2025 | — |
| DEF 14A | Proxy statement | Apr 29, 2025 | Jun 25, 2025 |
| PRE 14A | Preliminary proxy statement | Apr 18, 2025 | Jun 25, 2025 |
| 8-K |
Current report
Officer or director change
|
Apr 4, 2025 | Apr 3, 2025 |
| 8-K |
Current report
Agreement ended
|
Mar 20, 2025 | Mar 20, 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 |
| 10-K | Annual report | Feb 27, 2025 | Dec 31, 2024 |
| 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 |
| 8-K |
Current report
Results of operations
|
Feb 12, 2025 | Feb 12, 2025 |
| 8-K |
Current report
Material agreement
|
Jan 21, 2025 | Jan 17, 2025 |
| 8-K |
Current report
Material agreement, New debt, Other events
|
Jan 17, 2025 | Jan 17, 2025 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Jan 16, 2025 | Jan 15, 2025 |
| SC 13G | Ownership over 5% (passive) | Dec 17, 2024 | — |
| 8-K |
Current report
Material agreement, Other events
|
Dec 17, 2024 | Dec 12, 2024 |
| 8-K |
Current report
Material agreement
|
Dec 11, 2024 | Dec 9, 2024 |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
Dec 10, 2024 | Dec 9, 2024 |
| 4 | Insider transaction | Dec 3, 2024 | Nov 29, 2024 |
| 8-K/A |
Amended current report
Exit or restructuring costs
|
Nov 19, 2024 | Sep 26, 2024 |
| SC 13G | Ownership over 5% (passive) | Nov 14, 2024 | — |
| 10-Q | Quarterly report | Nov 7, 2024 | Sep 30, 2024 |
| 8-K |
Current report
Results of operations
|
Nov 6, 2024 | Nov 6, 2024 |
| 8-K/A |
Amended current report
Officer or director change
|
Oct 7, 2024 | Sep 26, 2024 |
| 4 | Insider transaction | Oct 7, 2024 | Oct 3, 2024 |
| 8-K |
Current report
Exit or restructuring costs, Officer or director change
|
Sep 30, 2024 | Sep 26, 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 | — |
| 10-Q | Quarterly report | Aug 7, 2024 | Jun 30, 2024 |
| 8-K |
Current report
Results of operations
|
Aug 6, 2024 | Aug 6, 2024 |
| 8-K |
Current report
Material agreement, Agreement ended, New debt
|
Jul 22, 2024 | Jul 18, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Jul 8, 2024 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Jun 27, 2024 | Jun 27, 2024 |
| 8-K |
Current report
Shareholder vote results
|
Jun 26, 2024 | Jun 26, 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 |
| UPLOAD | Letter from the SEC | 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 |
| CORRESP | Letter to the SEC | Jun 12, 2024 | — |
| UPLOAD | Letter from the SEC | Jun 7, 2024 | — |
| CORRESP | Letter to the SEC | Jun 5, 2024 | — |
| UPLOAD | Letter from the SEC | May 29, 2024 | — |
| 10-Q | Quarterly report | May 9, 2024 | Mar 31, 2024 |
| 8-K |
Current report
Results of operations
|
May 8, 2024 | May 8, 2024 |
| DEFA14A | Additional proxy material | Apr 29, 2024 | — |
| DEF 14A | Proxy statement | Apr 29, 2024 | Jun 26, 2024 |
| PRE 14A | Preliminary proxy statement | Apr 19, 2024 | Jun 26, 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
- 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
- Dow Inc. DOW
- DuPont de Nemours, Inc. DD
- Albemarle Corp ALB
- Eastman Chemical Co EMN
- Hexcel Corp /DE/ HXL
- Avient Corp AVNT
- Rogers Corp ROG
- PureCycle Technologies, Inc. PCT
All 12 Plastic Materials, Synth Resins & Nonvulcan Elastomers companies
Source: SEC EDGAR filings. This is company-reported data, not investment advice.