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 Q2 2026
Institutions Reporting
14
Shares (Excl. Options)
104,980
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.
- Security type / class
- Equity / Ordinary Shares, par value $0.01 per share
- Symbol
- TSE
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 104,980
- Total 13F value
- $11,025
- Portfolio coverage rank
- 0%
- Share change
- -23,872,400
- Value change
- -$11,838,806
- Number of holders
- 14
- Shares outstanding
- 36,916,143
- SEC-reported price per share
- $0.00
- Insider filing price
- $0.00
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- TSE - Trinseo PLC - Ordinary Shares, par value $0.01 per share is tracked under CUSIP G9059U107.
- 14 institutions reported positions in Q1 2026.
- 3 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 14 to 2 between Q1 2026 and Q2 2026.
- SEC-reported value moved from $11,025 to $731.
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 14 institutions filings for Q1 2026.
Security key
G9059U107
Latest holder period
Q1 2026
13F holders
14
13D/G owners
3
CIK / CUSIP context first
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP G9059U107:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
3
Security
TSE
| 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, 14 institutional investors reported holding 104,980 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.
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
27
Latest
Q1 2026
Rows shown
1-25 of 27
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q2 | 457,260 | $731 | +$655 | $0.00 | 2 |
| 2026 Q1 | 104,980 | $11,025 | -$11,838,806 | $0.11 | 14 |
| 2025 Q4 | 24,748,809 | $12,300,686 | -$9,970,261 | $0.50 | 71 |
| 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 |