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Exhibit 10.5

 

Trinseo S.A.

4, rue Lou Hemmer

L-1748 Luxembourg – Findel

Grand Duchy of Luxembourg

 

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March 1, 2016

 

Ms. Marilyn Horner

 

Dear Ms. Horner:

 

RE: Definition of Retirement for Purposes of Equity Awards under 2014 Omnibus
Incentive Plan (the "Plan")

 

This letter confirms that the following definition of "Retirement" is applicable
to all Stock Options granted to you under the Plan to date and in the future
unless otherwise notified:

 

"Retirement" means a retirement from active Employment after the Optionee has
attained age fifty-five (55) with at least six (6) years of continuous service
with the Company.

 

This letter confirms that the following definition of "Retirement" is applicable
to all Restricted Stock Units granted to you under the Plan to date and in the
future unless otherwise notified:

 

"Retirement" means a retirement from active Employment after the Grantee has
attained age fifty-five (55) with at least six (6) years of continuous service
with the Company.

 

**

 

 

 

 

 

Trinseo S.A.

 

 

 

 

By:

/s/ Christopher D. Pappas

 

 

 

 

Name:

Christopher D. Pappas

 

 

 

 

Title:

Chief Executive Officer and President

 

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