Exhibit A

JOINT FILING AGREEMENT

The undersigned agree that this Schedule 13G Amendment No. 1 dated August 14, 2025 relating to the Ordinary Shares, par value $0.01 per share, of Trinseo PLC shall be filed on behalf of the undersigned.

 

CASTLEKNIGHT MASTER FUND LP

By: CastleKnight Fund GP LLC, its general partner

By: Weitman Capital LLC, its managing member 

 

By: /s/ Aaron Weitman

  Name: Aaron Weitman
  Title:   Manager

 

 

 

CASTLEKNIGHT FUND GP LLC

By: Weitman Capital LLC, its managing member

 

By: /s/ Aaron Weitman

  Name: Aaron Weitman
  Title:   Manager

 

 

 

CASTLEKNIGHT MANAGEMENT LP

By: CastleKnight Management GP LLC,

its general partner

By: Weitman Capital LLC, its managing member

 

By: /s/ Aaron Weitman

  Name: Aaron Weitman
  Title:   Manager

 

 

 

CASTLEKNIGHT MANAGEMENT GP LLC

By: Weitman Capital LLC, its managing member

 

By: /s/ Aaron Weitman

  Name: Aaron Weitman
  Title:   Manager

 

 

 

WEITMAN CAPITAL LLC

 

By: /s/ Aaron Weitman

  Name: Aaron Weitman
  Title:   Manager

 

 

 

AARON WEITMAN

 

By: /s/ Aaron Weitman

 

 

 

 

Exhibit B

CONTROL PERSON IDENTIFICATION

CastleKnight Management LP is the relevant entity for which Aaron Weitman may be considered a control person.