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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1519061	Trinseo S.a.	TSE	()	4

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1428312	D Christopher Pappas	C/O Trinseo S.a. 1000 Chesterbrook Boulevard, Suite 300 Berwyn PA 19312	See Remarks	Yes	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Ordinary Shares	Acquisiton	2017-04-17	15,000	$18.14	255,240	No	4	M	Direct
Ordinary Shares	Disposition	2017-04-17	15,000	$64.17	240,240	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Ordinary Shares	Option to Purchase Ordinary Shares	Disposition	2017-04-17	15,000	$0.00	15,000	$18.14

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
519,479	2016-02-27	2024-02-27	No	4	M	Direct

Footnotes

This Form 4 reflects the exercise of stock options and the sale of underlying shares pursuant to a duly adopted 10b5-1 trading plan entered into in accordance with the Issuer's insider trading policy, which provides for periodic stock option exercises as part of a personal liquidity and diversification strategy.
Represents the weighted average sale price for price increments ranging from $64.00 to $64.95, inclusive. The reporting person undertakes to provide to Trinseo S.A., any security holder of Trinseo S.A., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (2) to this Form 4.