Latest Period
Q1 2026
Security Snapshot
Trinseo PLC - Ordinary Shares, par value $0.01 per share (TSE) Institutional Ownership
CUSIP: G9059U107
13F Institutional Holders and Ownership History from Q3 2019 to Q1 2026
Institutions Reporting
13
Shares (Excl. Options)
104,914
Price
$0.11
Save this security page for your next review
Keep this CUSIP in your watchlists so you can revisit quarter changes from one place. If you create an account from here, we will bring you back after verification.
- Type / Class
- Equity / Ordinary Shares, par value $0.01 per share
- Symbol
- TSE
- Shares outstanding
- 36,916,143
- Price per share
- $0.11
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 104,914
- Total reported value
- $11,018
- % of total 13F portfolios
- 0%
- Share change
- -23,872,457
- Value change
- -$11,838,812
- Number of holders
- 13
- Price from insider filings
- $0.11
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors
Key facts
- TSE - Trinseo PLC - Ordinary Shares, par value $0.01 per share is tracked under CUSIP G9059U107.
- 13 institutions reported positions in Q1 2026.
- 3 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 70 to 13 between Q4 2025 and Q1 2026.
- Reported value moved from $12,300,682 to $11,018.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC Evidence
Latest holder context comes from 13 institutions filings for Q1 2026.
Security key
G9059U107
Latest holder period
Q1 2026
13F holders
13
13D/G owners
3
CIK / CUSIP context first
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP G9059U107:
Significant Owners of Trinseo PLC - Ordinary Shares, par value $0.01 per share (TSE) based on Schedule 13D/G filings
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| BlackRock, Inc. | 6.3% | $8,456,719 | 2,255,125 | BlackRock, Inc. | 30 Jun 2025 | |||
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 5.8% | $1,693,811 | 2,091,125 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 31 Dec 2025 | |||
| CastleKnight Master Fund LP | 1.4% | -80% | $418,629 | -$1,822,014 | 516,826 | -81% | CastleKnight Master Fund LP | 31 Dec 2025 |
As of 31 Mar 2026, 13 institutional investors reported holding 104,914 shares of Trinseo PLC - Ordinary Shares, par value $0.01 per share (TSE). This represents 0.28% of the company’s total 36,916,143 outstanding shares.
Institutional Holders of Trinseo PLC - Ordinary Shares, par value $0.01 per share (TSE) across Reporting Periods
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 104,914 | $11,018 | -$11,838,812 | $0.11 | 13 |
| 2025 Q4 | 24,748,800 | $12,300,682 | -$9,970,261 | $0.50 | 70 |
| 2025 Q3 | 26,848,081 | $60,426,503 | -$2,561,222 | $2.35 | 74 |
| 2025 Q2 | 27,680,017 | $85,444,543 | +$6,908,226 | $3.12 | 80 |
| 2025 Q1 | 25,205,020 | $95,192,408 | +$227,708 | $3.68 | 85 |
| 2024 Q4 | 24,965,599 | $126,559,235 | +$8,302,489 | $5.10 | 95 |
| 2024 Q3 | 22,908,998 | $116,234,027 | -$3,240,258 | $5.11 | 71 |
| 2024 Q2 | 25,261,519 | $55,987,559 | -$9,396,897 | $2.31 | 95 |
| 2024 Q1 | 27,408,421 | $105,280,091 | -$21,098,784 | $3.78 | 104 |
| 2023 Q4 | 29,143,643 | $241,188,653 | -$5,907,974 | $8.37 | 126 |
| 2023 Q3 | 29,752,666 | $241,775,134 | -$41,807,613 | $8.17 | 144 |
| 2023 Q2 | 32,802,961 | $418,132,080 | -$12,498,617 | $12.67 | 140 |
| 2023 Q1 | 33,318,012 | $695,818,411 | +$11,139,887 | $20.85 | 165 |
| 2022 Q4 | 32,790,143 | $747,004,231 | +$30,441,354 | $22.71 | 178 |
| 2022 Q3 | 31,874,971 | $581,417,571 | -$50,356,911 | $18.32 | 163 |
| 2022 Q2 | 34,023,738 | $1,305,500,527 | -$11,045,976 | $38.46 | 183 |
| 2022 Q1 | 34,508,974 | $1,654,900,596 | -$28,237,350 | $47.92 | 181 |
| 2021 Q4 | 35,066,439 | $1,836,288,499 | +$1,805,342,295 | $52.46 | 171 |
| 2021 Q3 | 232,117 | $12,490,120 | +$12,441,532 | $53.97 | 14 |
| 2021 Q2 | 900 | $53,856 | $59.84 | 1 | |
| 2021 Q1 | 900 | $57,303 | -$1,000 | $63.67 | 1 |
| 2020 Q4 | 916 | $47,089 | $56.86 | 2 | |
| 2020 Q3 | 900 | $23,076 | $25.64 | 1 | |
| 2020 Q2 | 900 | $19,944 | +$19,944 | $22.16 | 1 |
| 2019 Q4 | 0 | $0 | -$32,728 | $0.11 | 0 |
| 2019 Q3 | 762 | $32,728 | +$32,728 | $42.95 | 1 |