Exhibit 32.1

Certification of CEO and Interim CFO Pursuant to 18 U.S.C. Section 1350,

As Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the annual report of Trinseo S.A. (the “Company”) on Form 10-K for the period ended December 31, 2015, as filed with the Securities and Exchange Commission on the date hereof, I, the undersigned, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the best of my knowledge, that:

(1) The report fully complies with the requirements of Section 13(a) or Section 15(d), as applicable, of the Securities Exchange Act of 1934 as amended; and

(2) The information contained in the report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: March 11, 2016

By:	/s/ Christopher D. Pappas
Name:	Christopher D. Pappas
Title:	Chief Executive Officer and Interim Chief Financial Officer