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Trinseo PLC (TSEOQ)

CUSIP: G9059U107 | 401 institutional holders

Quarters

Q3 2026Q2 2026Q1 2026Q4 2025Q3 2025
CompareDetailedHistoricalFundsOptions13D/13GPeersTargetingTrading SummaryProfile

Beneficial Ownership — 13D / 13G

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5%+ stakes reported outside the quarterly cycle. A 13D is due within five business days of the event below, so these figures lead the holders table until the filer's next 13F catches up to them.

HolderShares% of ClassChangeEvent Datevs 13F
13G/ABlackRock, Inc.105,8890.3%Newly reportedSep 30, 20262,413,178 sh (Dec 31, 2025)
13G/ABlackRock, Inc.105,889
0.3% of class · Sep 30, 2026Newly reported
2,413,178 sh (Dec 31, 2025)

Institutional Holders — Q3 2026

Gamma Investing LLC412,655
0.0% of portfolio›$5.4K
StyleTurnoverLocationFiled
Gamma Investing LLC
412,655$5.4K0.0%IndexVery LowFoster City, CA2026-10-08