Trinseo PLC — Director's Dealing 2021

Mar 1, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Trinseo S.A. (TSE)
CIK: 0001519061
Period of Report: 2021-02-26

Reporting Person: Chaclas Angelo N. (SVP, CLO, CCO & Corp. Sec.)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-02-26	Ordinary Shares	M	7892	$18.14	Acquired	38902	Direct
2021-02-26	Ordinary Shares	M	7992	$26.97	Acquired	46894	Direct
2021-02-26	Ordinary Shares	S	15884	$65.22	Disposed	31010	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-02-26	Option to Purchase Ordinary Shares	$18.14	M	7892	Disposed	2024-02-27	Ordinary Shares (7892)	Direct
2021-02-26	Option to Purchase Ordinary Shares	$26.97	M	7992	Disposed	2025-02-22	Ordinary Shares (7992)	Direct

Footnotes

F1: 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 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.

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