$Trinseo S.A. Ordinary Shares(TSE)$ 8-K - Current report Filed: 2017-12-28 AccNo: 0001104659-17-075450 Size: 248 KBItem 5.02: Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain OfficersItem 9.01: Financial Statements and Exhib 网页链接