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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
1607416	Michel Plantevin	C/O Bain Capital Europe, Llp Devonshire House, Mayfair Pl. London X0 W1J 8AJ		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	2016-03-24	10,600,000	$35.63	26,669,567	No	4	S	Indirect	See Footnotes

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

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Ordinary Shares	3,236	Direct

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 ("GPEB") of Bain Capital Investors. LLC. Mr. Plantevin is a member of GPEB. By virtue of these relationships described in these footnotes, Mr. Plantevin may be deemed to share voting and dispositive power with respect to all of the shares of Trinseo S.A. held by BCEM Holding. Mr. Plantevin disclaims beneficial ownership of such securities except to the extent or of his pecuniary interest therein.
Represents shares subject to restricted stock unit award that will 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. If the grantee's service as a member of the Board ceases for any reason other than death, the award, to the extent not already vested, will be automatically and immediately forfeited.