TRINSEO S.A. 2014 OMNIBUS INCENTIVE PLAN RESTRICTED STOCK UNIT AGREEMENT (NON-EMPLOYEEDIRECTORS)

Exhibit 10.38

TRINSEO S.A.

2014 OMNIBUS INCENTIVE PLAN

RESTRICTED STOCK UNIT AGREEMENT (NON-EMPLOYEE DIRECTORS)

This agreement (this “Agreement”) evidences an award (the “Award”) of restricted stock units (the “Restricted Stock Units”) granted by Trinseo S.A. (the “Company”) to the undersigned (the “Grantee”) pursuant to the Trinseo S.A. 2014 Omnibus Incentive Plan (as amended from time to time, the “Plan”), which is incorporated herein by reference.

1. Grant of Restricted Stock Units. On the date of grant set forth above (the “Grant Date”) the Company granted to the Grantee an award consisting of the right to receive on the terms provided herein and in the Plan, one share of Stock with respect to each Restricted Stock Unit forming part of the Award, in each case, subject to adjustment pursuant to Section 7(b) of the Plan in respect of transactions occurring after the date hereof.

2. Meaning of Certain Terms. Except as otherwise defined herein, all capitalized terms used herein have the same meaning as in the Plan.

3. Vesting, etc. The Award shall vest in full on the earlier of (a) the first anniversary of the Grant Date, subject to the Grantee’s continued service as a member of the Board through such date, or (b) the termination of the Grantee’s service as a member of the Board as a result of his or her death. Except as provided in subsection (b), if the Grantee’s service as a member of the Board ceases for any reason, the Award, to the extent not already vested will be automatically and immediately forfeited.

4. Delivery of Stock. The Company shall, as soon as practicable upon the vesting of the Restricted Stock Units (but in no event later than March 15 of the year following the year in which such Restricted Stock Units vest) effect delivery of the Stock with respect to such vested Restricted Stock Units to the Grantee (or, in the event of the Grantee’s death, to the person to whom the Award has passed by will or the laws of descent and distribution). No Stock will be issued pursuant to this Award unless and until all legal requirements applicable to the issuance or transfer of such Stock have been complied with to the satisfaction of the Administrator.

5. Dividends; Other Rights. The Award shall not be interpreted to bestow upon the Grantee any equity interest or ownership in the Company or any Affiliate prior to the date on which the Company delivers shares of Stock to the Grantee (if any). The Grantee is not entitled to vote any shares of Stock by reason of the granting of this Award

or to receive or be credited with any dividends declared and payable on any share of Stock prior to the date on which any such share is delivered to the Grantee hereunder. The Grantee shall have the rights of a shareholder only as to those shares of Stock, if any, that are actually delivered under this Award.

6. Forfeiture; Recovery of Compensation. By accepting the Award the Grantee expressly acknowledges and agrees that his or her rights (and those of any permitted transferee) under the Award or to any Stock acquired under the Award or any proceeds from the disposition thereof are subject to Section 6(a)(5) of the Plan (including any successor provision). Nothing in the preceding sentence shall be construed as limiting the general application of Section 10 of this Agreement.

7. Nontransferability. Neither the Award nor the Restricted Stock Units may be transferred except at death in accordance with Section 6(a)(3) of the Plan.

8. Certain Tax Matters.

9. Effect on Service. Neither the grant of the Restricted Stock Units, nor the delivery of Stock upon vesting of the Award, will give the Grantee any right to be retained in the service of the Company or any of its Affiliates, affect the right of the Company or any of its Affiliates to discharge or discipline such Grantee at any time, or affect any right of such Grantee to terminate his or her service at any time.

10. Acknowledgements. By accepting the Award, the Grantee agrees to be bound by, and agrees that the Award and the Restricted Stock Units are subject in all respects to, the terms of the Plan. The Grantee further acknowledges and agrees that (i) this Agreement may be executed in two or more counterparts, each of which shall be an original and all of which together shall constitute one and the same instrument, (ii) this agreement may be executed and exchanged using facsimile, portable document format (PDF) or electronic signature, which, in each case, shall constitute an original signature for all purposes hereunder and (iii) such signature by the Company will be binding against the Company and will create a legally binding agreement when this Agreement is countersigned by the Grantee.

[Signature page follows.]

-2-

IN WITNESS WHEREOF, the Company has caused this Agreement to be executed by its duly authorized officer.

Dated:

Acknowledged and Agreed:

[Signature Page to Restricted Stock Unit Agreement]