Trinseo PLC — Director's Dealing 2014

Jun 11, 2014

SEC Form 3 — Initial Statement of Beneficial Ownership

Issuer: Trinseo S.A. (TSE)
CIK: 0001519061
Period of Report: 2014-06-11

Reporting Person: BAIN CAPITAL INVESTORS LLC (10% Owner)
Reporting Person: Bain Capital Everest Manager Holding SCA (10% Owner)
Reporting Person: Bain Capital Everest Manager S.a.r.l. (10% Owner)
Reporting Person: Bain Capital Europe Fund III, L.P. (10% Owner)
Reporting Person: Bain Capital Partners Europe III, L.P. (10% Owner)
Reporting Person: Bain Capital Fund X LP (10% Owner)
Reporting Person: Bain Capital Partners X, L.P. (10% Owner)
Reporting Person: BCIP Associates IV, L.P. (10% Owner)
Reporting Person: BCIP Associates IV-B, L.P. (10% Owner)
Reporting Person: BCIP Trust Associates IV, L.P. (10% Owner)

Holdings (Non-Derivative)

Security	Shares	Ownership
Ordinary Shares	37269567	Indirect

Footnotes

F1: Represents ordinary shares of Trinseo S.A. held by Bain Capital Everest Manager Holding SCA ("BCEM Holding") whose general partner is Bain Capital Everest Manager S.a r.l. ("BCEM"). All of the outstanding share capital of BCEM is held by Bain Capital Europe Fund III, L.P. ("Europe Fund III") and, in that capacity, Europe Fund III has the power to appoint the managers of BCEM. Bain Capital Investors, LLC ("BCI") is the general partner of Bain Capital Partners Europe III, L.P., which is the general partner of Europe Fund III. By virtue of these relationships, BCI may be deemed to share voting and dispositive power with respect to the shares held by BCEM Holding. BCI disclaims beneficial ownership of the shares held by BCEM Holding except to the extent of its pecuniary interest therein.

F2: In addition to being the general partner of Bain Capital Partners Europe III, L.P., which is the general partner of Europe Fund III, BCI is the general partner of Bain Capital Partners X, L.P., which is the general partner of Bain Capital Fund X, L.P. BCI is also the managing general partner of BCIP Associates IV, L.P., BCIP Associates IV-B, L.P., BCIP Trust Associates IV, L.P. and BCIP Trust Associates IV-B, L.P. By virtue of these relationships, BCI may be deemed to share voting and dispositive power with respect to the shares of Trinseo S.A. held by BCEM Holding that may be deemed to be beneficially owned by the Bain Capital funds. BCI and each of the Bain Capital funds disclaims beneficial ownership of the shares owned by BCEM Holding except to the extent of its pecuniary interest therein.