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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1519061	Trinseo S.a.	TSE	Plastic Materials, Synth Resins & Nonvulcan Elastomers (2821)	000000000

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1607005	Aurelien Vasseur	C/O Bain Capital Luxembourg S.a R.l. 4 Rue Lou Hemmer, L-1748 Luxembourg N4		Yes	No	Yes	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	Disposition	2016-08-12	8,000,000	$49.15	10,669,567	No	4	S	Indirect	See Footnotes

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	See Footnotes

Footnotes

Represents ordinary shares of Trinseo S.A. held by Bain Capital Everest Manager Holding SCA ("BCEM Holding").
The governance, investment strategy and decision-making process with respect to the investments held by all of the Bain Capital funds is directed by the Global Private Equity Board of Bain Capital Investors, LLC ("BCI"). Mr. Vasseur is a corporate manager of BCI. By virtue of these relationships described in these footnotes, Mr. Vasseur may be deemed to share voting and dispositive power with respect to the shares of Trinseo S.A. held by BCEM Holding. Mr. Vasseur disclaims beneficial ownership of such securities except to the extent of his pecuniary interest therein.