Key facts
- CastleKnight Master Fund LP filed SCHEDULE 13G/A for Trinseo PLC Ordinary Shares, par value $0.01 per share (TSE).
- Disclosed ownership: 1.4%.
- Date of event: 31 Dec 2025.
CastleKnight Master Fund LP - 31 Dec 2025 SCHEDULE 13G/A Report for Trinseo PLC Ordinary Shares, par value $0.01 per share (TSE)
- Filing Manager
- CastleKnight Master Fund LP
- Reporting Manager
- CastleKnight Master Fund LP
- Symbol
- TSE
- Shares outstanding
- 36,916,143 shares
- Disclosed Ownership
- 516,826 shares
- Ownership
- 1.4%
- Form type
- SCHEDULE 13G/A
- Filing time
- 17 Feb 2026, 17:18:43 UTC
- Date of event
- 31 Dec 2025
- Previous filing
- 14 Aug 2025
- SEC
- View on sec.gov
Key filing fact
CastleKnight Master Fund LP disclosed 1.4% ownership in Trinseo PLC Ordinary Shares, par value $0.01 per share (TSE) on 31 Dec 2025.
Change
- Previous schedule filing date: 14 Aug 2025.
- Current filing was accepted on 17 Feb 2026, 17:18.
Research use
- This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
- You can verify ownership claims directly against the original SEC filing.
Evidence
Backed by Schedule 13D/13G
See Original Filing
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
Reporting persons
Reporting managers (6)
Names, ownership, voting power, signatures, titles, and CIKs as disclosed in this Schedule 13D/G filing.
| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| CastleKnight Master Fund LP | 1.4% | 516,826 | 0 | 516,826 | By: CastleKnight Fund GP LLC, its general partner, By: Weitman Capital LLC, its managing member | By: /s/ Aaron Weitman / Manager | |
| CastleKnight Fund GP LLC | 1.4% | 516,826 | 0 | 516,826 | By: Weitman Capital LLC, its managing member | By: /s/ Aaron Weitman / Manager | |
| CastleKnight Management LP | 1.4% | 516,826 | 0 | 516,826 | By: CastleKnight Management GP LLC, its general partner, By: Weitman Capital LLC, its managing member | By: /s/ Aaron Weitman / Manager | |
| CastleKnight Management GP LLC | 1.4% | 516,826 | 0 | 516,826 | By: Weitman Capital LLC, its managing member | By: /s/ Aaron Weitman / Manager | |
| Weitman Capital LLC | 1.4% | 516,826 | 0 | 516,826 | By: /s/ Aaron Weitman | Aaron Weitman / Manager | |
| Aaron Weitman | 1.4% | 516,826 | 0 | 516,826 | By: /s/ Aaron Weitman | Aaron Weitman |
CIK / CUSIP context first