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 |
|---|---|---|---|
| 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 | — |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
May 15, 2026 | May 15, 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 |
| 8-K |
Current report
Listing notice
|
Mar 3, 2026 | Mar 2, 2026 |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
Feb 17, 2026 | Feb 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 |
| 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 |
| 8-K |
Current report
Regulation FD disclosure
|
Aug 26, 2025 | Aug 26, 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 |
| 8-K |
Current report
Shareholder vote results
|
Jun 26, 2025 | Jun 25, 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 |
| 10-K | Annual report | Feb 27, 2025 | Dec 31, 2024 |
| 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 |
| 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 |
| 8-K/A |
Amended current report
Exit or restructuring costs
|
Nov 19, 2024 | Sep 26, 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 |
| 8-K |
Current report
Exit or restructuring costs, Officer or director change
|
Sep 30, 2024 | Sep 26, 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 |
| 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 |
| UPLOAD | Letter from the SEC | Jun 21, 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 |
| 8-K |
Current report
Material agreement, New debt
|
Apr 2, 2024 | Mar 28, 2024 |
| 8-K |
Current report
Regulation FD disclosure
|
Mar 13, 2024 | Mar 13, 2024 |
| 8-K |
Current report
Officer or director change
|
Feb 27, 2024 | Feb 21, 2024 |
| 10-K | Annual report | Feb 23, 2024 | Dec 31, 2023 |
| 8-K |
Current report
Results of operations
|
Feb 12, 2024 | Feb 12, 2024 |
| 10-Q | Quarterly report | Nov 6, 2023 | Sep 30, 2023 |
| 8-K |
Current report
Results of operations
|
Nov 3, 2023 | Nov 3, 2023 |
| 8-K/A |
Amended current report
Exit or restructuring costs, Other events
|
Oct 30, 2023 | Aug 17, 2023 |
| 8-K |
Current report
Officer or director change
|
Sep 22, 2023 | Sep 21, 2023 |
| 8-K |
Current report
Material agreement, New debt, Other events
|
Sep 8, 2023 | Sep 8, 2023 |
| 8-K |
Current report
Exit or restructuring costs
|
Aug 23, 2023 | Aug 17, 2023 |
| 8-K |
Current report
Regulation FD disclosure
|
Aug 16, 2023 | Aug 16, 2023 |
| 8-K |
Current report
Regulation FD disclosure
|
Aug 10, 2023 | Aug 9, 2023 |
| S-8 | Employee stock plan registration | Aug 4, 2023 | — |
| 10-Q | Quarterly report | Aug 4, 2023 | Jun 30, 2023 |
| 8-K |
Current report
Results of operations
|
Aug 3, 2023 | Aug 3, 2023 |
| 8-K |
Current report
Officer or director change
|
Jul 26, 2023 | Jul 20, 2023 |
| 8-K |
Current report
Officer or director change
|
Jul 20, 2023 | Jul 20, 2023 |
| 8-K |
Current report
Shareholder vote results
|
Jun 16, 2023 | Jun 14, 2023 |
| DEFA14A | Additional proxy material | Jun 9, 2023 | — |
| DEFA14A | Additional proxy material | May 15, 2023 | — |
| 10-Q | Quarterly report | May 5, 2023 | Mar 31, 2023 |
| 8-K |
Current report
Regulation FD disclosure
|
May 5, 2023 | May 5, 2023 |
| 8-K |
Current report
Results of operations
|
May 4, 2023 | May 4, 2023 |
| DEFA14A | Additional proxy material | May 2, 2023 | — |
| DEF 14A | Proxy statement | May 1, 2023 | — |
| PRE 14A | Preliminary proxy statement | Apr 21, 2023 | — |
| 8-K |
Current report
Officer or director change
|
Apr 18, 2023 | Apr 13, 2023 |
| 10-K | Annual report | Feb 27, 2023 | Dec 31, 2022 |
| 8-K |
Current report
Results of operations
|
Feb 8, 2023 | Feb 8, 2023 |
| 8-K |
Current report
Results of operations
|
Jan 26, 2023 | Jan 26, 2023 |
| 8-K |
Current report
Exit or restructuring costs, Other events
|
Dec 19, 2022 | Dec 13, 2022 |
| 10-Q | Quarterly report | Nov 4, 2022 | Sep 30, 2022 |
| 8-K |
Current report
Results of operations
|
Nov 2, 2022 | Nov 2, 2022 |
| 8-K |
Current report
Results of operations
|
Oct 18, 2022 | Oct 18, 2022 |
| S-8 | Employee stock plan registration | Aug 9, 2022 | — |
| 10-Q | Quarterly report | Aug 9, 2022 | Jun 30, 2022 |
| 8-K |
Current report
Results of operations
|
Aug 8, 2022 | Aug 8, 2022 |
| 8-K |
Current report
Shareholder vote results
|
Jun 17, 2022 | Jun 14, 2022 |
| 10-Q | Quarterly report | May 5, 2022 | Mar 31, 2022 |
| 8-K |
Current report
Results of operations
|
May 4, 2022 | May 4, 2022 |
| DEFA14A | Additional proxy material | Apr 25, 2022 | — |
| DEF 14A | Proxy statement | Apr 25, 2022 | Jun 14, 2022 |
| PRE 14A | Preliminary proxy statement | Apr 15, 2022 | Jun 14, 2022 |
| 8-K |
Current report
Regulation FD disclosure
|
Feb 25, 2022 | Feb 25, 2022 |
| 8-K |
Current report
Officer or director change
|
Feb 23, 2022 | Feb 17, 2022 |
| 10-K | Annual report | Feb 23, 2022 | Dec 31, 2021 |
| 8-K |
Current report
Results of operations
|
Feb 8, 2022 | Feb 8, 2022 |
| 8-K |
Current report
Results of operations
|
Jan 24, 2022 | Jan 24, 2022 |
| 8-K |
Current report
Other events
|
Dec 2, 2021 | Dec 2, 2021 |
| 8-K |
Current report
Material agreement, Acquisition or sale of assets, Other events
|
Dec 2, 2021 | Dec 1, 2021 |
| 10-Q | Quarterly report | Nov 8, 2021 | Sep 30, 2021 |
| 8-K |
Current report
Results of operations
|
Nov 5, 2021 | Nov 5, 2021 |
| 8-K |
Current report
Officer or director change
|
Oct 27, 2021 | Oct 21, 2021 |
| 15-12B | Deregistration | Oct 18, 2021 | — |
| 25-NSE | Delisting notice | Oct 8, 2021 | — |
| 8-K12B | Filing | Oct 8, 2021 | Oct 8, 2021 |
| S-8 POS | Filing | Oct 8, 2021 | — |
| S-8 POS | Filing | Oct 8, 2021 | — |
| S-8 POS | Filing | Oct 8, 2021 | — |
| 10-Q | Quarterly report | Aug 5, 2021 | Jun 30, 2021 |
| 8-K |
Current report
Results of operations
|
Aug 4, 2021 | Aug 4, 2021 |
| 8-K |
Current report
Material agreement
|
Jul 21, 2021 | Jul 19, 2021 |
| 8-K |
Current report
Regulation FD disclosure
|
Jul 19, 2021 | Jul 19, 2021 |
| 8-K/A |
Amended current report
Acquisition or sale of assets
|
Jul 13, 2021 | May 3, 2021 |
| 8-K |
Current report
Shareholder vote results
|
Jun 17, 2021 | Jun 14, 2021 |
| UPLOAD | Letter from the SEC | Jun 15, 2021 | — |
| 8-K |
Current report
Material agreement, Other events
|
May 25, 2021 | May 21, 2021 |
| 8-K |
Current report
Material agreement
|
May 14, 2021 | May 6, 2021 |
| CORRESP | Letter to the SEC | May 12, 2021 | — |
| 10-Q | Quarterly report | May 7, 2021 | Mar 31, 2021 |
| 8-K |
Current report
Results of operations
|
May 6, 2021 | May 6, 2021 |
| UPLOAD | Letter from the SEC | May 6, 2021 | — |
| 8-K |
Current report
Material agreement, New debt
|
May 5, 2021 | May 3, 2021 |
| 8-K |
Current report
Acquisition or sale of assets, Other events
|
May 3, 2021 | May 3, 2021 |
| DEFA14A | Additional proxy material | Apr 27, 2021 | — |
| DEF 14A | Proxy statement | Apr 27, 2021 | Jun 14, 2021 |
| PRE 14A | Preliminary proxy statement | Apr 12, 2021 | Jun 14, 2021 |
| 8-K |
Current report
Other events
|
Mar 26, 2021 | Mar 26, 2021 |
| 8-K |
Current report
Material agreement, New debt
|
Mar 24, 2021 | Mar 24, 2021 |
| 8-K |
Current report
Material agreement
|
Mar 22, 2021 | Mar 22, 2021 |
| 8-K |
Current report
Other events
|
Mar 17, 2021 | Mar 17, 2021 |
| 8-K |
Current report
Regulation FD disclosure
|
Mar 15, 2021 | Mar 15, 2021 |
| 8-K |
Current report
Regulation FD disclosure
|
Mar 10, 2021 | Mar 10, 2021 |
| 10-K | Annual report | Feb 22, 2021 | Dec 31, 2020 |
| 8-K |
Current report
Results of operations
|
Feb 3, 2021 | Feb 3, 2021 |
| 8-K |
Current report
Material agreement, Other events
|
Dec 17, 2020 | Dec 14, 2020 |
| 8-K |
Current report
Regulation FD disclosure
|
Dec 14, 2020 | Dec 14, 2020 |
| 10-Q | Quarterly report | Nov 6, 2020 | Sep 30, 2020 |
| 8-K |
Current report
Results of operations
|
Nov 5, 2020 | Nov 5, 2020 |
| 8-K |
Current report
Material agreement
|
Oct 30, 2020 | Oct 30, 2020 |
| 8-K/A |
Amended current report
Results of operations
|
Oct 19, 2020 | Oct 19, 2020 |
| 8-K |
Current report
Results of operations
|
Oct 19, 2020 | Oct 15, 2020 |
| 8-K |
Current report
Officer or director change
|
Sep 29, 2020 | Sep 24, 2020 |
| S-8 | Employee stock plan registration | Jul 30, 2020 | — |
| 10-Q | Quarterly report | Jul 30, 2020 | Jun 30, 2020 |
| 8-K |
Current report
Results of operations
|
Jul 29, 2020 | Jul 29, 2020 |
| 8-K |
Current report
Material agreement
|
Jul 2, 2020 | Jun 29, 2020 |
| 8-K/A |
Amended current report
Officer or director change
|
Jun 26, 2020 | Apr 10, 2020 |
| 8-K |
Current report
Shareholder vote results
|
Jun 11, 2020 | Jun 9, 2020 |
| 10-Q | Quarterly report | May 8, 2020 | Mar 31, 2020 |
| DEFA14A | Additional proxy material | May 7, 2020 | — |
| 8-K |
Current report
Results of operations
|
May 6, 2020 | May 6, 2020 |
| DEFA14A | Additional proxy material | Apr 27, 2020 | — |
| DEF 14A | Proxy statement | Apr 27, 2020 | Jun 9, 2020 |
| PRE 14A | Preliminary proxy statement | Apr 15, 2020 | Jun 9, 2020 |
| 8-K |
Current report
Officer or director change
|
Apr 15, 2020 | Apr 10, 2020 |
| 8-K |
Current report
New debt, Regulation FD disclosure
|
Apr 1, 2020 | Mar 31, 2020 |
| 8-K |
Current report
Officer or director change
|
Mar 27, 2020 | Mar 27, 2020 |
| 8-K |
Current report
Other events
|
Mar 4, 2020 | Mar 4, 2020 |
| 10-K | Annual report | Feb 28, 2020 | Dec 31, 2019 |
| 8-K |
Current report
Agreement ended, Other events
|
Feb 26, 2020 | Feb 26, 2020 |
| 8-K |
Current report
Results of operations
|
Feb 6, 2020 | Feb 6, 2020 |
| 8-K/A |
Amended current report
Exit or restructuring costs
|
Jan 31, 2020 | Nov 29, 2019 |
| 8-K |
Current report
Exit or restructuring costs
|
Dec 4, 2019 | Nov 29, 2019 |
| 8-K |
Current report
Shareholder vote results
|
Nov 20, 2019 | Nov 20, 2019 |
| 10-Q/A | Amended quarterly report | Nov 12, 2019 | Sep 30, 2019 |
| 10-Q | Quarterly report | Nov 5, 2019 | Sep 30, 2019 |
| 8-K |
Current report
Results of operations
|
Nov 4, 2019 | Nov 4, 2019 |
| DEF 14A | Proxy statement | Oct 21, 2019 | Nov 20, 2019 |
| 8-K |
Current report
Other events
|
Oct 7, 2019 | Oct 7, 2019 |
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.