TSEOQ

SEC source: 0001179110-22-000856 · edgar.xml · nonDerivative · entry 2

BOZICH FRANK A · CIK 0001660737 · Director · CEO and President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 114,396

F1 · kind: A portion of the proceeds from the sale were used to pay the exercise price of stock options pursuant to a broker-assisted cashless exercise, and applicable withholding taxes. The exercise and sale were made pursuant to a preexisting 10b5-1 plan executed in May 2021.

F2 · price: Price reflects the weighted average sale price for the sale transactions made on the date reported above. Sale prices ranged from $53.29 to $55.02. The reporting person will provide, upon request by the Staff, the Company, or a security holder of the Company, full information regarding the number of shares purchased or sold at each separate price.

SEC source: 0001179110-22-000856 · edgar.xml · nonDerivative · entry 1

BOZICH FRANK A · CIK 0001660737 · Director · CEO and President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 135,353

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: 0001179110-22-000329 · edgar.xml · derivative · entry 3

BOZICH FRANK A · CIK 0001660737 · Director · CEO and President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 104,786

Underlying: Ordinary Shares · 20,957 shares

Expires 2029-02-25

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.

F3 · derivative.exercise_date: The option vests in three equal annual installments beginning on the first anniversary of the grant date.

SEC source: 0001179110-22-000329 · edgar.xml · nonDerivative · entry 2

BOZICH FRANK A · CIK 0001660737 · Director · CEO and President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 114,396

F1 · kind: A portion of the proceeds from the sale were used to pay the exercise price of stock options pursuant to a broker-assisted cashless exercise, and applicable withholding taxes. The exercise and sale were made pursuant to a preexisting 10b5-1 plan executed in May 2021.

F2 · price: Price reflects the weighted average sale price for the sale transactions made on the date reported above. Sale prices ranged from $56.13 to $57.11. The reporting person will provide, upon request by the Staff, the Company, or a security holder of the Company, full information regarding the number of shares purchased or sold at each separate price.

SEC source: 0001179110-22-000329 · edgar.xml · nonDerivative · entry 1

BOZICH FRANK A · CIK 0001660737 · Director · CEO and President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 135,353

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: 0001179110-21-010485 · edgar.xml · nonDerivative · entry 1

Cooney Paula M. · CIK 0001670565 · SVP & CHRO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,058

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

SEC source: 0001567619-21-020642 · doc1.xml · nonDerivative · entry 2

M&G INVESTMENT MANAGEMENT LTD · CIK 0000922898 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Please see footnote

Disclosed balance after: 7,634,044

F1 · ownership.nature: The reported securities are held directly by certain funds advised by M&G Investment Management Limited ("M&G"): (i) M&G (Lux) Investment Funds 1 holds 2,609,620 ordinary shares in Trinseo PLC.; (ii) M&G Global Dividend Fund directly holds 3,233,461 ordinary shares in Trinseo PLC.; (iii) LF Access Global Dividend Fund directly holds 1,738,526 ordinary shares in Trinseo PLC; and (iv) Fund Channel Investment Partners - FCH M&G Global Dividend directly holds 52,437 ordinary shares in Trinseo PLC. The reported securities may be deemed beneficially owned for the purposes of Section 13(d) of the Securities Exchange Act 1934 by M&G as investment manager to these funds. The Reporting Person disclaims beneficial ownership of the securities for purposes of Rule 16a-1(a) (2) and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.

SEC source: 0001567619-21-020642 · doc1.xml · nonDerivative · entry 1

M&G INVESTMENT MANAGEMENT LTD · CIK 0000922898 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Please see footnote

Disclosed balance after: 7,634,044

F1 · ownership.nature: The reported securities are held directly by certain funds advised by M&G Investment Management Limited ("M&G"): (i) M&G (Lux) Investment Funds 1 holds 2,609,620 ordinary shares in Trinseo PLC.; (ii) M&G Global Dividend Fund directly holds 3,233,461 ordinary shares in Trinseo PLC.; (iii) LF Access Global Dividend Fund directly holds 1,738,526 ordinary shares in Trinseo PLC; and (iv) Fund Channel Investment Partners - FCH M&G Global Dividend directly holds 52,437 ordinary shares in Trinseo PLC. The reported securities may be deemed beneficially owned for the purposes of Section 13(d) of the Securities Exchange Act 1934 by M&G as investment manager to these funds. The Reporting Person disclaims beneficial ownership of the securities for purposes of Rule 16a-1(a) (2) and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.

SEC source: 0001179110-21-010166 · edgar.xml · derivative · entry 6

HEEZEN ALICE · CIK 0001736490 · SVP - Human Resources

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,682

Underlying: Ordinary Shares · 5,363 shares

Expires 2028-02-26

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.

F4 · derivative.exercise_date: Options will vest in three equal annual installments beginning on the first anniversary of the grant date.

SEC source: 0001179110-21-010166 · edgar.xml · derivative · entry 5

HEEZEN ALICE · CIK 0001736490 · SVP - Human Resources

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,887

Underlying: Ordinary Shares · 6,443 shares

Expires 2029-02-25

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.

F4 · derivative.exercise_date: Options will vest in three equal annual installments beginning on the first anniversary of the grant date.

SEC source: 0001179110-21-010166 · edgar.xml · nonDerivative · entry 4

HEEZEN ALICE · CIK 0001736490 · SVP - Human Resources

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,081

F3 · price: Price reflects the weighted average sale price for the sale transactions made on the date reported above. Sale prices ranged from $57.93 to $58.00. The reporting person will provide, upon request by the Staff, the Company, or a security holder of the Company, full information regarding the number of shares purchased or sold at each separate price.

SEC source: 0001179110-21-010166 · edgar.xml · nonDerivative · entry 3

HEEZEN ALICE · CIK 0001736490 · SVP - Human Resources

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,819

F1 · kind: A portion of the proceeds from the sale were used to pay the exercise price of stock options pursuant to a broker-assisted cashless exercise, and applicable withholding taxes.

F2 · price: Price reflects the weighted average sale price for the sale transactions made on the date reported above. Sale prices ranged from $57.75 to $57.79. The reporting person will provide, upon request by the Staff, the Company, or a security holder of the Company, full information regarding the number of shares purchased or sold at each separate price.

SEC source: 0001179110-21-010166 · edgar.xml · nonDerivative · entry 2

HEEZEN ALICE · CIK 0001736490 · SVP - Human Resources

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 23,625

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: 0001179110-21-010166 · edgar.xml · nonDerivative · entry 1

HEEZEN ALICE · CIK 0001736490 · SVP - Human Resources

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,262

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: 0001179110-21-008815 · edgar.xml · nonDerivative · entry 1

FARRELL MATTHEW · CIK 0001196053 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 19,260

SEC source: 0001179110-21-008806 · edgar.xml · nonDerivative · entry 1

Stasse David Phillip · CIK 0001441657 · EVP and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 44,096

F1 · kind: Shares withheld by the Company to pay taxes due following the vesting of previously granted restricted stock units.

SEC source: 0001567619-21-016454 · doc1.xml · nonDerivative · entry 2

M&G INVESTMENT MANAGEMENT LTD · CIK 0000922898 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Please see footnote

Disclosed balance after: 7,634,044

F2 · kind: Internal cross trade.

F1 · ownership.nature: The reported securities are held directly by certain funds advised by M&G Investment Management Limited, (i) M&G (Lux) Investment Funds 1 holds 2,499,620 ordinary shares in Trinseo S.A.; (ii) M&G Global Dividend Fund directly holds 3,465,898 ordinary shares in Trinseo S.A.; and (iii) LF Access Global Dividend Fund directly holds 1,668,526 ordinary shares in Trinseo S.A. The reported securities may be deemed beneficially owned for the purposes of Section 13(d) of the Securities Exchange Act 1934 by M&G Investment Management Limited as investment manager to these funds. The Reporting Person disclaims beneficial ownership of the securities for purposes of Rule 16a-1(a) (2) and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.

SEC source: 0001567619-21-016454 · doc1.xml · nonDerivative · entry 1

M&G INVESTMENT MANAGEMENT LTD · CIK 0000922898 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Please see footnote

Disclosed balance after: 7,634,044

F2 · kind: Internal cross trade.

F1 · ownership.nature: The reported securities are held directly by certain funds advised by M&G Investment Management Limited, (i) M&G (Lux) Investment Funds 1 holds 2,499,620 ordinary shares in Trinseo S.A.; (ii) M&G Global Dividend Fund directly holds 3,465,898 ordinary shares in Trinseo S.A.; and (iii) LF Access Global Dividend Fund directly holds 1,668,526 ordinary shares in Trinseo S.A. The reported securities may be deemed beneficially owned for the purposes of Section 13(d) of the Securities Exchange Act 1934 by M&G Investment Management Limited as investment manager to these funds. The Reporting Person disclaims beneficial ownership of the securities for purposes of Rule 16a-1(a) (2) and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.

SEC source: 0001567619-21-014715 · doc1.xml · nonDerivative · entry 2

M&G INVESTMENT MANAGEMENT LTD · CIK 0000922898 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Please see footnote

Disclosed balance after: 7,634,044

F2 · kind: Internal cross trade.

F1 · ownership.nature: The reported securities are held directly by certain funds advised by M&G Investment Management Limited, (i) M&G (Lux) Investment Funds 1 holds 2,499,620 ordinary shares in Trinseo S.A.; (ii) M&G Global Dividend Fund directly holds 3,507,887 ordinary shares in Trinseo S.A.; and (iii) LF Access Global Dividend Fund directly holds 1,626,537 ordinary shares in Trinseo S.A. The reported securities may be deemed beneficially owned for the purposes of Section 13(d) of the Securities Exchange Act 1934 by M&G Investment Management Limited as investment manager to these funds. The Reporting Person disclaims beneficial ownership of the securities for purposes of Rule 16a-1(a) (2) and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.

SEC source: 0001567619-21-014715 · doc1.xml · nonDerivative · entry 1

M&G INVESTMENT MANAGEMENT LTD · CIK 0000922898 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Please see footnote

Disclosed balance after: 7,634,044

F2 · kind: Internal cross trade.

F1 · ownership.nature: The reported securities are held directly by certain funds advised by M&G Investment Management Limited, (i) M&G (Lux) Investment Funds 1 holds 2,499,620 ordinary shares in Trinseo S.A.; (ii) M&G Global Dividend Fund directly holds 3,507,887 ordinary shares in Trinseo S.A.; and (iii) LF Access Global Dividend Fund directly holds 1,626,537 ordinary shares in Trinseo S.A. The reported securities may be deemed beneficially owned for the purposes of Section 13(d) of the Securities Exchange Act 1934 by M&G Investment Management Limited as investment manager to these funds. The Reporting Person disclaims beneficial ownership of the securities for purposes of Rule 16a-1(a) (2) and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.

SEC source: 0001179110-21-006919 · edgar.xml · nonDerivative · entry 1

ALVARADO JOSEPH · CIK 0001047461 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 13,611

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: 0001179110-21-006923 · edgar.xml · nonDerivative · entry 1

De Leener Pierre-Marie · CIK 0001423137 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,005

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: 0001179110-21-006916 · edgar.xml · nonDerivative · entry 1

STEINMETZ HENRI · CIK 0001207044 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 27,284

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: 0001179110-21-006913 · edgar.xml · nonDerivative · entry 1

TOMKINS MARK E · CIK 0001204576 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,015

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: 0001179110-21-006926 · edgar.xml · nonDerivative · entry 1

MARTENS PHILIP R · CIK 0001190851 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,130

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: 0001179110-21-006928 · edgar.xml · nonDerivative · entry 1

FARRELL MATTHEW · CIK 0001196053 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,260

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

SEC source: 0001179110-21-006931 · edgar.xml · nonDerivative · entry 1

COTE JEFFREY J · CIK 0001196701 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,047

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: 0001179110-21-006920 · edgar.xml · nonDerivative · entry 1

LIN SANDRA BEACH · CIK 0001220571 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,215

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: 0001179110-21-006925 · edgar.xml · nonDerivative · entry 1

Misheff Donald T · CIK 0001538453 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,455

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: 0001179110-21-006927 · edgar.xml · nonDerivative · entry 1

Johnson KLynne · CIK 0001532447 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,065

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: 0001179110-21-006924 · edgar.xml · nonDerivative · entry 1

Desmond Jeanmarie F. · CIK 0001713192 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,260

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: 0001179110-21-006922 · edgar.xml · nonDerivative · entry 1

Brifo Victoria · CIK 0001867705 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,260

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: 0001179110-21-006645 · edgar.xml · nonDerivative · entry 1

De Leener Pierre-Marie · CIK 0001423137 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,745

SEC source: 0001179110-21-006577 · edgar.xml · nonDerivative · entry 1

De Leener Pierre-Marie · CIK 0001423137 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 17,084

F1 · shares: Shares withheld by the Company to pay taxes due following the vesting of previously granted restricted stock units.

SEC source: 0001179110-21-006578 · edgar.xml · nonDerivative · entry 1

STEINMETZ HENRI · CIK 0001207044 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 25,024

F1 · shares: Shares withheld by the Company to pay taxes due following the vesting of previously granted restricted stock units.

SEC source: 0001179110-21-006526 · edgar.xml · derivative · entry 2

Schewe Rainer · CIK 0001661138 · SVP, Supply Chain Services

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,494

Underlying: Ordinary Shares · 7,746 shares

Expires 2029-04-21

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 · derivative.exercise_date: The options vest in three equal annual installments beginning on the first anniversary of the grant date.

SEC source: 0001179110-21-006526 · edgar.xml · nonDerivative · entry 1

Schewe Rainer · CIK 0001661138 · SVP, Supply Chain Services

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,862

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: 0001179110-21-006430 · edgar.xml · nonDerivative · entry 1

Johnson KLynne · CIK 0001532447 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,805

F1 · price: Price reflects the weighted average sale price for the sale transactions made on the date reported above. Sale prices ranged from $66.86 to 66.98. The reporting person will provide, upon request by the Staff, the Company, or a security holder of the Company, full information regarding the number of shares purchased or sold at each separate price.

SEC source: 0001567619-21-011486 · doc1.xml · nonDerivative · entry 1

M&G INVESTMENT MANAGEMENT LTD · CIK 0000922898 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Please see footnote

Disclosed balance after: 7,634,044

F1 · ownership.nature: The reported securities are held directly by certain funds advised by M&G Investment Management Limited, (i) M&G (Lux) Investment Funds 1 holds 2,499,620 ordinary shares in Trinseo S.A.; (ii) M&G Global Dividend Fund directly holds 3,554,353 ordinary shares in Trinseo S.A.; and (iii) LF Access Global Dividend Fund directly holds 1,580,071 ordinary shares in Trinseo S.A. The reported securities may be deemed beneficially owned for the purposes of Section 13(d) of the Securities Exchange Act 1934 by M&G Investment Management Limited as investment manager to these funds. The Reporting Person disclaims beneficial ownership of the securities for purposes of Rule 16a-1(a) (2) and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.

SEC source: 0001567619-21-009185 · doc1.xml · nonDerivative · entry 2

M&G INVESTMENT MANAGEMENT LTD · CIK 0000922898 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Please see footnote

Disclosed balance after: 7,637,044

F1 · ownership.nature: The reported securities are held directly by certain funds advised by M&G Investment Management Limited, (i) M&G (Lux) Investment Funds 1 holds 2,499,620 ordinary shares in Trinseo S.A.; (ii) M&G Global Dividend Fund directly holds 3,557,353 ordinary shares in Trinseo S.A.; and (iii) LF Access Global Dividend Fund directly holds 1,580,071 ordinary shares in Trinseo S.A. The reported securities may be deemed beneficially owned for the purposes of Section 13(d) of the Securities Exchange Act 1934 by M&G Investment Management Limited as investment manager to these funds. The Reporting Person disclaims beneficial ownership of the securities for purposes of Rule 16a-1(a) (2) and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.

SEC source: 0001567619-21-009185 · doc1.xml · nonDerivative · entry 1

M&G INVESTMENT MANAGEMENT LTD · CIK 0000922898 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Please see footnote

Disclosed balance after: 7,642,044

F1 · ownership.nature: The reported securities are held directly by certain funds advised by M&G Investment Management Limited, (i) M&G (Lux) Investment Funds 1 holds 2,499,620 ordinary shares in Trinseo S.A.; (ii) M&G Global Dividend Fund directly holds 3,557,353 ordinary shares in Trinseo S.A.; and (iii) LF Access Global Dividend Fund directly holds 1,580,071 ordinary shares in Trinseo S.A. The reported securities may be deemed beneficially owned for the purposes of Section 13(d) of the Securities Exchange Act 1934 by M&G Investment Management Limited as investment manager to these funds. The Reporting Person disclaims beneficial ownership of the securities for purposes of Rule 16a-1(a) (2) and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.

SEC source: 0001567619-21-009057 · doc1.xml · nonDerivative · entry 1

M&G INVESTMENT MANAGEMENT LTD · CIK 0000922898 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Please see footnote

Disclosed balance after: 7,647,044

F1 · ownership.nature: The reported securities are held directly by certain funds advised by M&G Investment Management Limited, (i) M&G (Lux) Investment Funds 1 holds 2,499,620 ordinary shares in Trinseo S.A.; (ii) M&G Global Dividend Fund directly holds 3,567,353 ordinary shares in Trinseo S.A.; and (iii) LF Access Global Dividend Fund directly holds 1,580,071 ordinary shares in Trinseo S.A. The reported securities may be deemed beneficially owned for the purposes of Section 13(d) of the Securities Exchange Act 1934 by M&G Investment Management Limited as investment manager to these funds. The Reporting Person disclaims beneficial ownership of the securities for purposes of Rule 16a-1(a) (2) and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.

SEC source: 0001179110-21-004884 · edgar.xml · derivative · entry 2

Beal Jean-Luc · CIK 0001859272 · SVP, Engineered Materials

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,622

Underlying: Ordinary Shares · 9,622 shares

Expires 2030-05-03

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

SEC source: 0001179110-21-004884 · edgar.xml · nonDerivative · entry 1

Beal Jean-Luc · CIK 0001859272 · SVP, Engineered Materials

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,635

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

SEC source: 0001567619-21-008710 · doc1.xml · nonDerivative · entry 1

M&G INVESTMENT MANAGEMENT LTD · CIK 0000922898 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Please see footnote

Disclosed balance after: 7,650,044

F1 · ownership.nature: The reported securities are held directly by certain funds advised by M&G Investment Management Limited, (i) M&G (Lux) Investment Funds 1 holds 2,499,620 ordinary shares in Trinseo S.A.; (ii) M&G Global Dividend Fund directly holds 3,570,353 ordinary shares in Trinseo S.A.; and (iii) LF Access Global Dividend Fund directly holds 1,580,071 ordinary shares in Trinseo S.A. The reported securities may be deemed beneficially owned for the purposes of Section 13(d) of the Securities Exchange Act 1934 by M&G Investment Management Limited as investment manager to these funds. The Reporting Person disclaims beneficial ownership of the securities for purposes of Rule 16a-1(a) (2) and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.

SEC source: 0001567619-21-008617 · doc1.xml · nonDerivative · entry 1

M&G INVESTMENT MANAGEMENT LTD · CIK 0000922898 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Please see footnote

Disclosed balance after: 7,652,044

F1 · ownership.nature: The reported securities are held directly by certain funds advised by M&G Investment Management Limited, (i) M&G (Lux) Investment Funds 1 holds 2,499,620 ordinary shares in Trinseo S.A.; (ii) M&G Global Dividend Fund directly holds 3,572,353 ordinary shares in Trinseo S.A.; and (iii) LF Access Global Dividend Fund directly holds 1,580,071 ordinary shares in Trinseo S.A. The reported securities may be deemed beneficially owned for the purposes of Section 13(d) of the Securities Exchange Act 1934 by M&G Investment Management Limited as investment manager to these funds. The Reporting Person disclaims beneficial ownership of the securities for purposes of Rule 16a-1(a) (2) and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.

SEC source: 0001567619-21-008562 · doc1.xml · nonDerivative · entry 1

M&G INVESTMENT MANAGEMENT LTD · CIK 0000922898 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Please see footnote

Disclosed balance after: 7,655,044

F1 · ownership.nature: The reported securities are held directly by certain funds advised by M&G Investment Management Limited, (i) M&G (Lux) Investment Funds 1 holds 2,499,620 ordinary shares in Trinseo S.A.; (ii) M&G Global Dividend Fund directly holds 3,575,353 ordinary shares in Trinseo S.A.; and (iii) LF Access Global Dividend Fund directly holds 1,580,071 ordinary shares in Trinseo S.A. The reported securities may be deemed beneficially owned for the purposes of Section 13(d) of the Securities Exchange Act 1934 by M&G Investment Management Limited as investment manager to these funds. The Reporting Person disclaims beneficial ownership of the securities for purposes of Rule 16a-1(a) (2) and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.

SEC source: 0001567619-21-008441 · doc1.xml · nonDerivative · entry 1

M&G INVESTMENT MANAGEMENT LTD · CIK 0000922898 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Please see footnote

Disclosed balance after: 7,658,044

F1 · ownership.nature: The reported securities are held directly by certain funds advised by M&G Investment Management Limited, (i) M&G (Lux) Investment Funds 1 holds 2,499,620 ordinary shares in Trinseo S.A.; (ii) M&G Global Dividend Fund directly holds 3,578,353 ordinary shares in Trinseo S.A.; and (iii) LF Access Global Dividend Fund directly holds 1,580,071 ordinary shares in Trinseo S.A. The reported securities may be deemed beneficially owned for the purposes of Section 13(d) of the Securities Exchange Act 1934 by M&G Investment Management Limited as investment manager to these funds. The Reporting Person disclaims beneficial ownership of the securities for purposes of Rule 16a-1(a) (2) and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.

SEC source: 0001567619-21-008096 · doc1.xml · nonDerivative · entry 1

M&G INVESTMENT MANAGEMENT LTD · CIK 0000922898 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Please see footnote

Disclosed balance after: 7,661,044

F1 · ownership.nature: The reported securities are held directly by certain funds advised by M&G Investment Management Limited, (i) M&G (Lux) Investment Funds 1 holds 2,499,620 ordinary shares in Trinseo S.A.; (ii) M&G Global Dividend Fund directly holds 3,581,353 ordinary shares in Trinseo S.A.; and (iii) LF Access Global Dividend Fund directly holds 1,580,071 ordinary shares in Trinseo S.A. The reported securities may be deemed beneficially owned for the purposes of Section 13(d) of the Securities Exchange Act 1934 by M&G Investment Management Limited as investment manager to these funds. The Reporting Person disclaims beneficial ownership of the securities for purposes of Rule 16a-1(a) (2) and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.

SEC source: 0001567619-21-007123 · doc1.xml · nonDerivative · entry 1

M&G INVESTMENT MANAGEMENT LTD · CIK 0000922898 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Please see footnote

Disclosed balance after: 7,664,044

F1 · ownership.nature: The reported securities are held directly by certain funds advised by M&G Investment Management Limited, (i) M&G (Lux) Investment Funds 1 holds 2,499,620 ordinary shares in Trinseo S.A.; (ii) M&G Global Dividend Fund directly holds 3,584,353 ordinary shares in Trinseo S.A.; and (iii) LF Access Global Dividend Fund directly holds 1,580,071 ordinary shares in Trinseo S.A. The reported securities may be deemed beneficially owned for the purposes of Section 13(d) of the Securities Exchange Act 1934 by M&G Investment Management Limited as investment manager to these funds. The Reporting Person disclaims beneficial ownership of the securities for purposes of Rule 16a-1(a) (2) and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.