Trinseo PLC announced the termination of Andre Lanning, Senior Vice President and Chief Operating Officer, as part of a reorganization of company's executive leadership. He will serve as Special Advisor from August 1, 2023 until his exit by January 31, 2024. As part of his departure, Mr. Lanning will receive a severance package which includes a payment amounting to 1.5 times of his base salary and target cash bonus, paid over 18 months, among other benefits.