TSEOQ

SEC source: 0001567619-21-006668 · 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: 7,666,044

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 3,586,353 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: 0001567619-21-006568 · 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: 7,669,044

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 3,589,353 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: 0001567619-21-006159 · 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: 7,671,044

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 3,591,353 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: 0001179110-21-003401 · edgar.xml · nonDerivative · entry 1

Thomas Timothy J · CIK 0001790892 · Vice President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,831

F1 · price: Price reflects the weighted average sale price for the sale transaction made on the date reported above. Sale prices ranged from $73.05 to 73.00. 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: 0001567619-21-006076 · doc1.xml · nonDerivative · entry 3

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

10b5-1 filing: Not disclosed

Ownership: Indirect · Please see footnote

Disclosed balance after: 7,674,044

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 3,594,353 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: 0001567619-21-006076 · 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: 7,676,044

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 3,594,353 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: 0001567619-21-006076 · 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: 7,679,044

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 3,594,353 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: 0001567619-21-005891 · 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: 7,682,044

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 3,602,353 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: 0001567619-21-005621 · 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: 7,685,044

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 3,605,353 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: 0001567619-21-005621 · 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: 7,687,044

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 3,605,353 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: 0001567619-21-005242 · 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: 7,690,044

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 3,610,353 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: 0001567619-21-005242 · 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: 7,692,044

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 3,610,353 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: 0001179110-21-002424 · edgar.xml · derivative · entry 8

Skeete Bernard M · CIK 0001781229 · VP, CAO and Global Controller

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 416

Underlying: Ordinary Shares · 415 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.

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

SEC source: 0001179110-21-002424 · edgar.xml · nonDerivative · entry 5

Skeete Bernard M · CIK 0001781229 · VP, CAO and Global Controller

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,159

F1 · kind: A portion of 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 $64.46 to 65.67. 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: 0001179110-21-002424 · edgar.xml · nonDerivative · entry 4

Skeete Bernard M · CIK 0001781229 · VP, CAO and Global Controller

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,574

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: 0001179110-21-002423 · edgar.xml · derivative · entry 5

Chaclas Angelo N. · CIK 0001629821 · SVP, CLO, CCO & Corp. Sec.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Ordinary Shares · 7,992 shares

Expires 2025-02-22

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 options vests in three equal annual installments beginning on the first anniversary of the grant date.

SEC source: 0001179110-21-002423 · edgar.xml · derivative · entry 4

Chaclas Angelo N. · CIK 0001629821 · SVP, CLO, CCO & Corp. Sec.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Ordinary Shares · 7,892 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.

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

SEC source: 0001179110-21-002423 · edgar.xml · nonDerivative · entry 3

Chaclas Angelo N. · CIK 0001629821 · SVP, CLO, CCO & Corp. Sec.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 31,010

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 $64.33 to $65.78 . The reporting person will provide, upon request by Staff, the Company, or a security holder of the Company, full information regarding the number of share purchased or sold at each separate price.

SEC source: 0001179110-21-002423 · edgar.xml · nonDerivative · entry 2

Chaclas Angelo N. · CIK 0001629821 · SVP, CLO, CCO & Corp. Sec.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 46,894

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: 0001179110-21-002423 · edgar.xml · nonDerivative · entry 1

Chaclas Angelo N. · CIK 0001629821 · SVP, CLO, CCO & Corp. Sec.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 38,902

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: 0001179110-21-002329 · edgar.xml · nonDerivative · entry 1

FARRELL MATTHEW · CIK 0001196053 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,000

F1 · price: Price reflects the weighted average sale price for the sale transactions made on the date reported above. Sale prices ranged from $65.50 to $65.55. 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: 0001179110-21-002328 · edgar.xml · nonDerivative · entry 1

COTE JEFFREY J · CIK 0001196701 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,787

SEC source: 0001179110-21-002424 · edgar.xml · derivative · entry 7

Skeete Bernard M · CIK 0001781229 · VP, CAO and Global Controller

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,689

Underlying: Ordinary Shares · 1,844 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: 0001179110-21-002424 · edgar.xml · derivative · entry 6

Skeete Bernard M · CIK 0001781229 · VP, CAO and Global Controller

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 831

Underlying: Ordinary Shares · 415 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.

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

SEC source: 0001179110-21-002424 · edgar.xml · nonDerivative · entry 3

Skeete Bernard M · CIK 0001781229 · VP, CAO and Global Controller

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,159

F1 · kind: A portion of 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 $64.46 to 65.67. 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: 0001179110-21-002424 · edgar.xml · nonDerivative · entry 2

Skeete Bernard M · CIK 0001781229 · VP, CAO and Global Controller

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,418

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: 0001179110-21-002424 · edgar.xml · nonDerivative · entry 1

Skeete Bernard M · CIK 0001781229 · VP, CAO and Global Controller

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,574

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: 0001179110-21-002428 · edgar.xml · derivative · entry 9

Stasse David Phillip · CIK 0001441657 · EVP and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,863

Underlying: Ordinary Shares · 11,431 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: 0001179110-21-002428 · edgar.xml · derivative · entry 8

Stasse David Phillip · CIK 0001441657 · EVP and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,847

Underlying: Ordinary Shares · 1,923 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.

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

SEC source: 0001179110-21-002428 · edgar.xml · derivative · entry 7

Stasse David Phillip · CIK 0001441657 · EVP and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Ordinary Shares · 2,346 shares

Expires 2025-02-22

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: 0001179110-21-002428 · edgar.xml · derivative · entry 6

Stasse David Phillip · CIK 0001441657 · EVP and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Ordinary Shares · 846 shares

Expires 2024-06-25

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: 0001179110-21-002428 · edgar.xml · nonDerivative · entry 5

Stasse David Phillip · CIK 0001441657 · EVP and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 45,230

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 $65.37 to $65.55. 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: 0001179110-21-002428 · edgar.xml · nonDerivative · entry 4

Stasse David Phillip · CIK 0001441657 · EVP and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 61,776

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: 0001179110-21-002428 · edgar.xml · nonDerivative · entry 3

Stasse David Phillip · CIK 0001441657 · EVP and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 50,345

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: 0001179110-21-002428 · edgar.xml · nonDerivative · entry 2

Stasse David Phillip · CIK 0001441657 · EVP and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 48,422

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: 0001179110-21-002428 · edgar.xml · nonDerivative · entry 1

Stasse David Phillip · CIK 0001441657 · EVP and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 46,076

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: 0001179110-21-002429 · edgar.xml · derivative · entry 5

Leib Ryan J · CIK 0001659260 · Vice President and Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Ordinary Shares · 811 shares

Expires 2025-02-22

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: 0001179110-21-002429 · edgar.xml · derivative · entry 4

Leib Ryan J · CIK 0001659260 · Vice President and Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,972

Underlying: Ordinary Shares · 2,486 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: 0001179110-21-002429 · edgar.xml · nonDerivative · entry 3

Leib Ryan J · CIK 0001659260 · Vice President and Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,792

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 $65.05 to $65.69. 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: 0001179110-21-002429 · edgar.xml · nonDerivative · entry 2

Leib Ryan J · CIK 0001659260 · Vice President and Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,065

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: 0001179110-21-002429 · edgar.xml · nonDerivative · entry 1

Leib Ryan J · CIK 0001659260 · Vice President and Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,254

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: 0001567619-21-004870 · 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: 7,695,044

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 3,615,353 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: 0001567619-21-004642 · 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: 7,700,044

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 2,504,620 ordinary shares in Trinseo S.A.; (ii) M&G Global Dividend Fund directly holds 3,615,353 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: 0001567619-21-004642 · 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: 7,702,044

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 2,504,620 ordinary shares in Trinseo S.A.; (ii) M&G Global Dividend Fund directly holds 3,615,353 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: 0001179110-21-002206 · edgar.xml · nonDerivative · entry 1

Reverberi Francesca · CIK 0001811002 · VP, Eng Mtrls & Synth Rubber

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,709

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

SEC source: 0001179110-21-002207 · edgar.xml · nonDerivative · entry 1

Joly Nicolas · CIK 0001810986 · VP, Plastics & Feedstocks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,403

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

SEC source: 0001179110-21-002202 · edgar.xml · nonDerivative · entry 1

Skeete Bernard M · CIK 0001781229 · VP, CAO and Global Controller

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,159

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

SEC source: 0001179110-21-002201 · edgar.xml · nonDerivative · entry 1

HEEZEN ALICE · CIK 0001736490 · SVP - Human Resources

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,819

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

SEC source: 0001179110-21-002204 · edgar.xml · nonDerivative · entry 1

Stasse David Phillip · CIK 0001441657 · EVP and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 45,230

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

SEC source: 0001179110-21-002205 · edgar.xml · nonDerivative · entry 1

Chaclas Angelo N. · CIK 0001629821 · SVP, CLO, CCO & Corp. Sec.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 31,010

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