Trinseo PLC's latest layoff filing, on December 10, 2025, states charges of $30 million to $40 million. As of November 6, 2026, it has reported 2 exit or restructuring plans to the SEC on Form 8-K under Item 2.05. No WARN notice under its name is on file in the states covered here (Form 8-K, December 10, 2025).
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| Artiva Biotherapeutics, Inc. | announced layoffs | |
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| Acumen Pharmaceuticals, Inc. | announced layoffs of about 52 employees |
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Trinseo PLC reported 2 exit or restructuring plans on Form 8-K under Item 2.05. Each fact below is the filing's own sentence, quoted and linked. No WARN notice under this company's name is on file in the states covered here.
Did Trinseo have layoffs in 2025? What its filings say
Trinseo PLC (CIK 1519061) reported 2 exit or restructuring plans to the SEC on Form 8-K under Item 2.05. The sentences below are quoted from the filings as written.
Form 8-K filed 2025-12-10
Locations
On December 5, 2025, the management team of Trinseo PLC (the "Company"), upon authorization from the Company's Board of Directors, approved a restructuring plan to permanently close its polystyrene ("PS") production operations in Schkopau, Germany with consolidation of remaining PS operations in Tessenderlo, Belgium (the "PS Restructuring Plan").
Expected charges
The Company expects to record total pre-tax restructuring charges of $30 million to $40 million, principally comprised of $3 million to $5 million of employee-related costs, $10 million to $14 million of asset-related charges and $15 million to $21 million related to exiting production activities, including contract terminations, demolition and decommissioning.
Timing
The anticipated future cash payments associated with these charges are expected to be approximately $18 million to $24 million with substantially all payments expected to be made by the end of 2028.
Form 8-K filed 2025-10-06
Locations
On October 2, 2025, the management team of Trinseo PLC (the "Company"), upon authorization from the Company's Board of Directors, approved a restructuring plan to permanently close its methyl methacrylate (MMA) production operations in Rho, Italy and its acetone cyanohydrin (ACH) production operations in Porto Marghera, Italy (the "MMA Restructuring Plan").
Expected charges
The Company expects to record total pre-tax restructuring charges of $80 million to $100 million, principally comprised of $3 million to $6 million of employee-related costs, $40 million to $46 million of asset-related charges and $37 million to $48 million related to exiting production activities, including contract terminations, demolition and decommissioning.
Timing
The anticipated future cash payments associated with these charges are expected to be approximately $40 million to $50 million with substantially all payments expected to be made by the end of 2028.
Also on the record for Trinseo PLC
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| October 27, 2026 | Stake report, Schedule 13G/A, by BlackRock, Inc. | 0.3% of the class | 5%+ stakes | Source |
| May 15, 2026 | Stake report, Schedule 13G/A, by Nut Tree Capital Management, LP | 8.3% of the class | 5%+ stakes | Source |
| February 17, 2026 | Stake report, Schedule 13G/A, by CastleKnight Master Fund LP | 1.4% of the class | 5%+ stakes | Source |
| February 12, 2026 | Stake report, Schedule 13G, by CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 5.8% of the class | 5%+ stakes | Source |
| August 14, 2025 | Stake report, Schedule 13G/A, by CastleKnight Master Fund LP | 7.8% of the class | 5%+ stakes | Source |
| July 17, 2025 | Stake report, Schedule 13G, by BlackRock, Inc. | 6.3% of the class | 5%+ stakes | Source |
Keep reading
More on Trinseo PLC and the records around it.
Trinseo PLC elsewhere on the record
- 5%+ stake filings Oct 2026
- Bankruptcy record
Companies that share a holder
- Nut Tree Capital Management, LP also filed stake reports on 2 other companies: BrightSpire Capital, Inc. (Aug 2026), Xponential Fitness, Inc. (Aug 2025)
- CHARLES SCHWAB INVESTMENT MANAGEMENT INC also filed stake reports on 12 other companies: HAIN CELESTIAL GROUP INC (Aug 2026), MEDIFAST INC (Aug 2026), Service Properties Trust (Aug 2026)
- CastleKnight Master Fund LP also filed stake reports on 17 other companies: Suja Life, Inc. (Aug 2026), Advantage Solutions Inc. (Aug 2026), HAIN CELESTIAL GROUP INC (Aug 2026)
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Public companies must also report to the SEC, on Form 8-K under Item 2.05, when they commit to an exit or restructuring plan that will cost them material charges, which is how most large layoffs and closures by listed companies are disclosed. Those filings are national, so they cover companies in every state. Each sentence shown from one is quoted exactly and linked to the filing; where a filing does not state a figure, none is shown.
Where this comes from
Employers covered by the federal WARN Act, and by the stricter laws some states add, must give written notice before a mass layoff or a site closure. The state labor department publishes those notices. Every row here is one of them, taken from that state's own published file and linked to it, so each figure can be checked at the source.
A notice states the employer, the location, the number of employees affected, and when the layoff or closure takes effect. It does not state a reason, and neither does this page. Where a company also appears in SEC filings under the same name and in the same state, its recorded fundraising is shown alongside, as a matter of record rather than as an explanation. New Jersey and Pennsylvania list a notice under the month it was posted or received, not the day, so their notices show a month. Tennessee gives the county rather than the city.
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