| Filed | Form | Description | |
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| 4/29/25 | DEFA14A | DEFA14A | → |
| 4/29/25 | DEF 14A | DEF 14A | → |
| 4/18/25 | PRE 14A | PRE 14A | → |
| 4/29/24 | DEFA14A | DEFA14A | → |
| 4/29/24 | DEF 14A | DEF 14A | → |
| 4/19/24 | PRE 14A | PRE 14A | → |
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| Filed | Form | Description | |
|---|---|---|---|
| 3/3/26 | 4 | 4 | → |
| 3/3/26 | 4 | 4 | → |
| 3/3/26 | 4 | 4 | → |
| 3/3/26 | 4 | 4 | → |
| 3/3/26 | 4 | 4 | → |
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Trinseo is a company focusing particularly on the manufacture of plastics and latex binders. Trinseo was part of the Dow Chemical Company until Dow grouped several of its businesses for potential sale in 2009.