Trinseo shares rise 10.41% premarket as restructuring plans and cost-cutting measures announced.

Trinseo (NYSE: TSE) rose 10.41% in premarket trading following announcements of restructuring measures aimed at improving profitability amid weak demand. The company reported a $110 million net loss for Q3 2025, driven by declining sales volumes and pricing pressures, and announced the closure of a polystyrene plant in Germany and a shift to recycled PMMA production in Italy. These actions are projected to generate $30 million in annual savings and reduce capital expenditures by $10 million, despite upfront restructuring costs of $60–70 million over three years. The market appears to have interpreted the aggressive cost-cutting and strategic pivot toward recycled materials as a positive step to stabilize liquidity and align with long-term sustainability trends, despite near-term earnings challenges.