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: 2021-02-25

Reporting Person: Stasse David Phillip (EVP and CFO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-02-25	Ordinary Shares	M	846	$27.81	Acquired	46076	Direct
2021-02-25	Ordinary Shares	M	2346	$26.97	Acquired	48422	Direct
2021-02-25	Ordinary Shares	M	1923	$51.02	Acquired	50345	Direct
2021-02-25	Ordinary Shares	M	11431	$24.30	Acquired	61776	Direct
2021-02-25	Ordinary Shares	S	16546	$65.45	Disposed	45230	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-02-25	Option to Purchase Ordinary Shares	$27.81	M	846	Disposed	2024-06-25	Ordinary Shares (846)	Direct
2021-02-25	Option to Purchase Ordinary Shares	$26.97	M	2346	Disposed	2025-02-22	Ordinary Shares (2346)	Direct
2021-02-25	Option to Purchase Ordinary Shares	$51.02	M	1923	Disposed	2028-02-26	Ordinary Shares (1923)	Direct
2021-02-25	Option to Purchase Ordinary Shares	$24.30	M	11431	Disposed	2029-02-25	Ordinary Shares (11431)	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 $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.

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