TSEOQ

SEC source: 0001179110-17-004027 · edgar.xml · nonDerivative · entry 3

Horner Marilyn N · CIK 0001608265 · SVP - Human Resources

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 29,853

F1 · price: Represents the weighted average sale price for price increments ranging from $71.70 to $70.75, 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 (1) to this Form 4.

SEC source: 0001179110-17-004027 · edgar.xml · nonDerivative · entry 2

Horner Marilyn N · CIK 0001608265 · SVP - Human Resources

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 64,130

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001179110-17-004027 · edgar.xml · nonDerivative · entry 1

Horner Marilyn N · CIK 0001608265 · SVP - Human Resources

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 53,459

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001179110-17-003811 · edgar.xml · nonDerivative · entry 2

Pugh Martin · CIK 0001608296 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 27,729

F2 · balance_after: The reporting person retired effective March 1, 2017. Vesting of 6,607 previously granted restricted stock units was accelerated and 13,212 restricted stock units were forfeited as a result of his retirement. 372 of the 6,607 shares that vested were withheld to pay taxes due upon vesting.

SEC source: 0001179110-17-003811 · edgar.xml · nonDerivative · entry 1

Pugh Martin · CIK 0001608296 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 41,313

F1 · balance_after: The reporting person retired effective March 1, 2017. Vesting of 16,418 previously granted restricted stock units was accelerated and 8,208 restricted stock units were forfeited as a result of his retirement. 924 of the 16,418 shares that vested were withheld to pay taxes due upon vesting.

SEC source: 0001179110-17-002821 · edgar.xml · derivative · entry 2

Stasse David Phillip · CIK 0001441657 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,378

Underlying: Ordinary Shares · 3,794 shares

Expires 2026-02-16

F2 · derivative.exercise_date: The option vests in three equal annual installments beginning on the first anniversary of the grant date.

SEC source: 0001179110-17-002821 · edgar.xml · nonDerivative · entry 1

Stasse David Phillip · CIK 0001441657 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 27,678

F1 · shares: Represents ordinary shares issuable pursuant to a restricted stock unit award that will vest in full on the third anniversary of the grant date.

SEC source: 0001179110-17-002794 · edgar.xml · derivative · entry 2

Pappas Christopher D · CIK 0001428312 · Director · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 554,479

Underlying: Ordinary Shares · 78,669 shares

Expires 2026-02-16

F2 · derivative.exercise_date: The option vests in three equal annual installments beginning on the first anniversary of the grant date.

SEC source: 0001179110-17-002794 · edgar.xml · nonDerivative · entry 1

Pappas Christopher D · CIK 0001428312 · Director · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 240,240

F1 · shares: Represents ordinary shares issuable pursuant to a restricted stock unit award that will vest in full on the third anniversary of the grant date.

SEC source: 0001179110-17-002817 · edgar.xml · derivative · entry 2

Leib Ryan J · CIK 0001659260 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,893

Underlying: Ordinary Shares · 1,348 shares

Expires 2026-02-16

F2 · derivative.exercise_date: The option vests in three equal annual installments beginning on the first anniversary of the grant date.

SEC source: 0001179110-17-002817 · edgar.xml · nonDerivative · entry 1

Leib Ryan J · CIK 0001659260 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,134

F1 · shares: Represents ordinary shares issuable pursuant to a restricted stock unit award that will vest in full on the third anniversary of the grant date.

SEC source: 0001179110-17-002812 · edgar.xml · derivative · entry 2

Maxey Catherine C. · CIK 0001608133 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 23,142

Underlying: Ordinary Shares · 2,744 shares

Expires 2026-02-16

F2 · derivative.exercise_date: The option vests in three equal annual installments beginning on the first anniversary of the grant date.

SEC source: 0001179110-17-002812 · edgar.xml · nonDerivative · entry 1

Maxey Catherine C. · CIK 0001608133 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,030

F1 · shares: Represents ordinary shares issuable pursuant to a restricted stock unit award that will vest in full on the third anniversary of the grant date.

SEC source: 0001179110-17-002809 · edgar.xml · derivative · entry 2

Denton E. Jeffery · CIK 0001608369 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 46,751

Underlying: Ordinary Shares · 5,531 shares

Expires 2026-02-16

F2 · derivative.exercise_date: The option vests in three equal annual installments beginning on the first anniversary of the grant date.

SEC source: 0001179110-17-002809 · edgar.xml · nonDerivative · entry 1

Denton E. Jeffery · CIK 0001608369 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 19,441

F1 · shares: Represents ordinary shares issuable pursuant to a restricted stock unit award that will vest in full on the third anniversary of the grant date.

SEC source: 0001179110-17-002806 · edgar.xml · derivative · entry 2

Chaclas Angelo N. · CIK 0001629821 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 55,899

Underlying: Ordinary Shares · 8,253 shares

Expires 2026-02-16

F2 · derivative.exercise_date: The option vests in three equal annual installments beginning on the first anniversary of the grant date.

SEC source: 0001179110-17-002806 · edgar.xml · nonDerivative · entry 1

Chaclas Angelo N. · CIK 0001629821 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 21,480

F1 · shares: Represents ordinary shares issuable pursuant to a restricted stock unit award that will vest in full on the third anniversary of the grant date.

SEC source: 0001179110-17-002803 · edgar.xml · derivative · entry 2

Horner Marilyn N · CIK 0001608265 · SVP - Human Resources

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 76,901

Underlying: Ordinary Shares · 9,476 shares

Expires 2026-02-16

F2 · derivative.exercise_date: The option vests in three equal annual installments beginning on the first anniversary of the grant date.

SEC source: 0001179110-17-002803 · edgar.xml · nonDerivative · entry 1

Horner Marilyn N · CIK 0001608265 · SVP - Human Resources

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 29,853

F1 · shares: Represents ordinary shares issuable pursuant to a restricted stock unit award that will vest in full on the third anniversary of the grant date.

SEC source: 0001179110-17-002798 · edgar.xml · derivative · entry 2

Stedman Timothy M · CIK 0001657364 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 30,481

Underlying: Ordinary Shares · 7,951 shares

Expires 2026-02-16

F2 · derivative.exercise_date: The option vests in three equal annual installments beginning on the first anniversary of the grant date.

SEC source: 0001179110-17-002798 · edgar.xml · nonDerivative · entry 1

Stedman Timothy M · CIK 0001657364 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,788

F1 · shares: Represents ordinary shares issuable pursuant to a restricted stock unit award that will vest in full on the third anniversary of the grant date.

SEC source: 0001179110-17-002800 · edgar.xml · derivative · entry 2

Yarkadas Hayati · CIK 0001657363 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 30,481

Underlying: Ordinary Shares · 7,951 shares

Expires 2026-02-16

F2 · derivative.exercise_date: The option vests in three equal annual installments beginning on the first anniversary of the grant date.

SEC source: 0001179110-17-002800 · edgar.xml · nonDerivative · entry 1

Yarkadas Hayati · CIK 0001657363 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,888

F1 · shares: Represents ordinary shares issuable pursuant to a restricted stock unit award that will vest in full on the third anniversary of the grant date.

SEC source: 0001179110-17-002796 · edgar.xml · derivative · entry 2

Niziolek Barry J · CIK 0001675491 · EVP & Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 39,248

Underlying: Ordinary Shares · 11,844 shares

Expires 2026-02-16

F2 · derivative.exercise_date: The option vests in three equal annual installments beginning on the first anniversary of the grant date.

SEC source: 0001179110-17-002796 · edgar.xml · nonDerivative · entry 1

Niziolek Barry J · CIK 0001675491 · EVP & Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,584

F1 · shares: Represents ordinary shares issuable pursuant to a restricted stock unit award that will vest in full on the third anniversary of the grant date.

SEC source: 0001179110-17-002383 · edgar.xml · derivative · entry 3

Pappas Christopher D · CIK 0001428312 · Director · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 475,810

Underlying: Ordinary Shares · 20,000 shares

Expires 2024-02-27

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: 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.

SEC source: 0001179110-17-002383 · edgar.xml · nonDerivative · entry 2

Pappas Christopher D · CIK 0001428312 · Director · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 217,545

F1 · kind: 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.

F2 · price: Represents the weighted average sale price for price increments ranging from $70.15 to $70.75, 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.

SEC source: 0001179110-17-002383 · edgar.xml · nonDerivative · entry 1

Pappas Christopher D · CIK 0001428312 · Director · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 237,545

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: 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.

SEC source: 0001179110-17-000971 · edgar.xml · derivative · entry 3

Pappas Christopher D · CIK 0001428312 · Director · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 495,810

Underlying: Ordinary Shares · 20,000 shares

Expires 2024-02-27

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: 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.

SEC source: 0001179110-17-000971 · edgar.xml · nonDerivative · entry 2

Pappas Christopher D · CIK 0001428312 · Director · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 217,545

F1 · kind: 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.

F2 · price: Represents the weighted average sale price for price increments ranging from $62.43 to $63.30, 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.

SEC source: 0001179110-17-000971 · edgar.xml · nonDerivative · entry 1

Pappas Christopher D · CIK 0001428312 · Director · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 237,545

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: 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.

SEC source: 0001179110-16-030086 · edgar.xml · nonDerivative · entry 1

MARTENS PHILIP R · CIK 0001190851 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,585

F1 · shares: Represents ordinary shares issuable pursuant to a restricted stock unit award that will vest in full on the first anniversary of the grant date.

SEC source: 0000899243-16-030142 · doc4.xml · nonDerivative · entry 1

BAIN CAPITAL INVESTORS LLC · CIK 0001040508 · 10% owner

BCIP Trust Associates IV-B, L.P. · CIK 0001610190 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

F1 · ownership.nature: 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"). On September 23, 2016, BCEM Holding sold 10,669,567 Ordinary Shares. Following such sale, BCEM Holding held zero Ordinary Shares.

F2 · ownership.nature: 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. ("Partners Europe III"), which is the general partner of Europe Fund III. BCI is also the general partner of Bain Capital Partners X, L.P. ("Partners X"), which is the general partner of Bain Capital Fund X, L.P. ("Fund X"). Boylston Coinvestors, LLC is the general partner of BCIP Associates IV, L.P. ("BCIP IV"), BCIP Associates IV-B, L.P. ("BCIP IV-B"), BCIP Trust Associates IV, L.P. ("BCIP Trust IV") and BCIP Trust Associates IV-B, L.P. ("BCIP Trust IV-B," and, together with BCEM Holdings, BCEM, Europe Fund III, Partners Europe III, Fund X, Partners X, BCIP IV, BCIP IV-B and BCIP Trust IV, the "Bain Capital Entities").

F3 · ownership.nature: The governance, investment strategy and decision-making process with respect to the investments held by all of the Bain Capital Entities is directed by BCI's Global Private Equity Board. As a result, BCI may be deemed to share voting and dispositive power with respect to the shares of Trinseo S.A. held by BCEM Holding. BCI disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.

SEC source: 0000899243-16-030141 · doc4.xml · nonDerivative · entry 1

BAIN CAPITAL INVESTORS LLC · CIK 0001040508 · 10% owner

Bain Capital Everest Manager Holding SCA · CIK 0001607423 · 10% owner

Bain Capital Everest Manager S.a.r.l. · CIK 0001610192 · 10% owner

Bain Capital Europe Fund III, L.P. · CIK 0001610293 · 10% owner

Bain Capital Partners Europe III, L.P. · CIK 0001610292 · 10% owner

Bain Capital Fund X LP · CIK 0001417662 · 10% owner

Bain Capital Partners X, L.P. · CIK 0001525871 · 10% owner

BCIP Associates IV, L.P. · CIK 0001561353 · 10% owner

BCIP Associates IV-B, L.P. · CIK 0001561352 · 10% owner

BCIP Trust Associates IV, L.P. · CIK 0001610291 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

F1 · ownership.nature: 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"). On September 23, 2016, BCEM Holding sold 10,669,567 Ordinary Shares. Following such sale, BCEM Holding held zero Ordinary Shares.

F2 · ownership.nature: 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. ("Partners Europe III"), which is the general partner of Europe Fund III. BCI is also the general partner of Bain Capital Partners X, L.P. ("Partners X"), which is the general partner of Bain Capital Fund X, L.P. ("Fund X"). Boylston Coinvestors, LLC is the general partner of BCIP Associates IV, L.P. ("BCIP IV"), BCIP Associates IV-B, L.P. ("BCIP IV-B"), BCIP Trust Associates IV, L.P. ("BCIP Trust IV") and BCIP Trust Associates IV-B, L.P. ("BCIP Trust IV-B," and, together with BCEM Holdings, BCEM, Europe Fund III, Partners Europe III, Fund X, Partners X, BCIP IV, BCIP IV-B and BCIP Trust IV, the "Bain Capital Entities").

F3 · ownership.nature: The governance, investment strategy and decision-making process with respect to the investments held by all of the Bain Capital Entities is directed by BCI's Global Private Equity Board. As a result, BCI may be deemed to share voting and dispositive power with respect to the shares of Trinseo S.A. held by BCEM Holding. BCI disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.

SEC source: 0000899243-16-030135 · doc4.xml · nonDerivative · entry 1

Springham Ruth · CIK 0001683853 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

F1 · ownership.nature: 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").

F2 · ownership.nature: Ms. Springham is a manager of BCEM. By virtue of the relationships described in these footnotes, Ms. Springham may be deemed to share voting and dispositive power with respect to the shares of Trinseo S.A. held by BCEM Holding. Ms. Springham disclaims beneficial ownership of such securities except to the extent of her pecuniary interest therein.

SEC source: 0000899243-16-030139 · doc4.xml · nonDerivative · entry 1

ZIDE STEPHEN M · CIK 0001212455 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

F1 · ownership.nature: Represents ordinary shares of Trinseo S.A. held by Bain Capital Everest Manager Holding SCA ("BCEM Holding").

F2 · ownership.nature: The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital funds is directed by the Global Private Equity Board of Bain Capital Investors, LLC ("BCI"). Mr. Zide is a Senior Advisor of BCI. By virtue of these relationships described in these footnotes, Mr. Zide 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. Zide disclaims beneficial ownership of such securities except to the extent of his pecuniary interest therein.

SEC source: 0000899243-16-030140 · doc4.xml · nonDerivative · entry 1

Plantevin Michel · CIK 0001607416 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

F1 · ownership.nature: Represents ordinary shares of Trinseo S.A. held by Bain Capital Everest Manager Holding SCA ("BCEM Holding").

F2 · ownership.nature: The governance, investment strategy and decision-making process with respect to the investments held by 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 of his pecuniary interest therein.

SEC source: 0000899243-16-030138 · doc4.xml · nonDerivative · entry 1

Thomas Stephen F. · CIK 0001606937 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

F1 · ownership.nature: Represents ordinary shares of Trinseo S.A. held by Bain Capital Everest Manager Holding SCA ("BCEM Holding").

F2 · ownership.nature: 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. Thomas is a Managing Director of BCI. By virtue of these relationships described in these footnotes, Mr. Thomas 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. Thomas disclaims beneficial ownership of such securities except to the extent of his pecuniary interest therein.