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 |
|---|---|---|---|
| DEFA14A | Additional proxy material | Aug 7, 2026 | — |
| DEF 14A | Proxy statement | Aug 7, 2026 | Sep 23, 2026 |
| 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 |
| 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 |
| DEFA14A | Additional proxy material | Jun 9, 2023 | — |
| DEFA14A | Additional proxy material | May 15, 2023 | — |
| DEFA14A | Additional proxy material | May 2, 2023 | — |
| DEF 14A | Proxy statement | May 1, 2023 | — |
| PRE 14A | Preliminary proxy statement | Apr 21, 2023 | — |
| 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 |
| 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 |
| DEFA14A | Additional proxy material | May 7, 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 |
| DEF 14A | Proxy statement | Oct 21, 2019 | Nov 20, 2019 |
| DEFA14A | Additional proxy material | Jun 7, 2019 | — |
| DEFA14A | Additional proxy material | May 10, 2019 | — |
| DEF 14A | Proxy statement | Apr 30, 2019 | Jun 19, 2019 |
| PRE 14A | Preliminary proxy statement | Apr 19, 2019 | Jun 19, 2019 |
| DEFA14A | Additional proxy material | Jun 12, 2018 | — |
| DEFA14A | Additional proxy material | May 31, 2018 | — |
| DEF 14A | Proxy statement | Apr 30, 2018 | Jun 20, 2018 |
| PRE 14A | Preliminary proxy statement | Apr 19, 2018 | Apr 19, 2018 |
| DEF 14A | Proxy statement | Oct 20, 2017 | Nov 28, 2017 |
| DEFA14A | Additional proxy material | Jun 12, 2017 | — |
| DEFA14A | Additional proxy material | Jun 5, 2017 | — |
| DEFA14A | Additional proxy material | May 19, 2017 | — |
| DEFA14A | Additional proxy material | May 19, 2017 | — |
| DEFA14A | Additional proxy material | Apr 28, 2017 | — |
| DEF 14A | Proxy statement | Apr 28, 2017 | Jun 21, 2017 |
| PRE 14A | Preliminary proxy statement | Apr 17, 2017 | Jun 21, 2017 |
| DEFA14A | Additional proxy material | May 3, 2016 | — |
| DEF 14A | Proxy statement | May 3, 2016 | Jun 21, 2016 |
| PRE 14A | Preliminary proxy statement | Apr 21, 2016 | Jun 21, 2016 |
Showing 43 filings. 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.