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Livermore
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Trinseo PLC

TSEOQ
Exchange
OTC
Industry
Plastic Materials, Synth Resins & Nonvulcan Elastomers
SEC CIK
0001519061

No open-market purchases or sales by Trinseo PLC insiders were filed in the last 90 days; 6 institutions reported holding it in 13F filings for Q2 2026, worth $740 in total; no superinvestor holds it.

13F holders, Q3 2025

Institutional positions in Trinseo PLC as of Sep 30, 2025. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works

Institutional holders
75
−5 vs. Q2 2025
Shares held
26.8M
−832.0K (−3.0%) vs. Q2 2025
Total value
$60.4M
−$25.0M (−29.3%) vs. Q2 2025
New holders
15
22 more added
Sold out
20
17 more reduced

Compare with Q2 2025: new holders, sold out and not filed yet

Holders and value by quarter

Institutions reporting TSEOQ on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.

Institutional holdersQ3 2025: 75 institutions
Q1 2021: 209 institutionsQ2 2021: 214 institutionsQ3 2021: 184 institutionsQ4 2021: 185 institutionsQ1 2022: 189 institutionsQ2 2022: 194 institutionsQ3 2022: 182 institutionsQ4 2022: 182 institutionsQ1 2023: 167 institutionsQ2 2023: 145 institutionsQ3 2023: 146 institutionsQ4 2023: 128 institutionsQ1 2024: 109 institutionsQ2 2024: 98 institutionsQ3 2024: 71 institutionsQ4 2024: 95 institutionsQ1 2025: 85 institutionsQ2 2025: 80 institutionsQ3 2025: 75 institutionsQ4 2025: 73 institutionsQ1 2026: 14 institutionsQ2 2026: 6 institutions
Value heldQ3 2025: $60.4M
Q1 2021: $2.27BQ2 2021: $2.16BQ3 2021: $1.96BQ4 2021: $1.84BQ1 2022: $1.66BQ2 2022: $1.31BQ3 2022: $585.5MQ4 2022: $746.7MQ1 2023: $695.9MQ2 2023: $418.8MQ3 2023: $241.9MQ4 2023: $241.2MQ1 2024: $105.3MQ2 2024: $56.0MQ3 2024: $116.2MQ4 2024: $126.6MQ1 2025: $95.2MQ2 2025: $85.4MQ3 2025: $60.4MQ4 2025: $12.3MQ1 2026: $11.0KQ2 2026: $740
Institutions holding TSEOQ and their total value by quarter
QuarterHoldersValue
Q2 20266$740
Q1 202614$11.0K
Q4 202573$12.3M
Q3 202575$60.4M
Q2 202580$85.4M
Q1 202585$95.2M
Q4 202495$126.6M
Q3 202471$116.2M
Q2 202498$56.0M
Q1 2024109$105.3M
Q4 2023128$241.2M
Q3 2023146$241.9M
Q2 2023145$418.8M
Q1 2023167$695.9M
Q4 2022182$746.7M
Q3 2022182$585.5M
Q2 2022194$1.31B
Q1 2022189$1.66B
Q4 2021185$1.84B
Q3 2021184$1.96B
Q2 2021214$2.16B
Q1 2021209$2.27B

Institutions, Q3 2025

Shares, value and share of portfolio for each institution holding Trinseo PLC; share changes are against Q2 2025.

Institutions holding TSEOQ in Q3 2025
InstitutionSharesValue% of portfolioChange in sharesAction
M&G Plc7,625,044$15.3M0.08%00.0%Unchanged
Nut Tree Capital Management, LP3,500,000$8.22M1.90%00.0%Unchanged
CastleKnight Management LP2,466,826$5.80M0.31%−299,400−10.8%Reduced
BlackRock, Inc.2,369,672$5.57M0.00%+114,539+5.1%Added
Owl Creek Asset Management, L.P.1,669,952$3.92M0.45%00.0%Unchanged
Charles Schwab Investment Management Inc1,505,068$3.54M0.00%+542,167+56.3%Added
Brightline Capital Management, LLC1,060,000$2.49M1.02%+38,000+3.7%Added
Icon Advisers Inc1,000,000$2.35M0.51%+250,000+33.3%Added
Geode Capital Management, LLC841,828$1.98M0.00%+18,784+2.3%Added
Vanguard Group Inc755,643$1.78M0.00%−321,008−29.8%Reduced
Morgan Stanley454,287$1.07M0.00%−13,557−2.9%Reduced
State Street Corp423,786$995.9K0.00%+42,578+11.2%Added
Bank of America Corp363,641$854.6K0.00%+60,676+20.0%Added
Renaissance Technologies LLC314,700$739.5K0.00%+36,700+13.2%Added
Lakewood Capital Management, LP281,279$661.0K0.05%00.0%Unchanged
Northern Trust Corp268,689$631.4K0.00%+2,937+1.1%Added
Royal Bank of Canada227,821$536.0K0.00%−8,905−3.8%Reduced
UBS Group AG199,804$469.5K0.00%+9,339+4.9%Added
Alta Fundamental Advisers LLC152,974$359.5K0.17%+152,974New
D. E. Shaw & Co., Inc.147,316$346.2K0.00%−169,158−53.5%Reduced
Invesco Ltd.131,802$309.7K0.00%−63,457−32.5%Reduced
Goldman Sachs Group Inc125,993$296.1K0.00%+9,092+7.8%Added
Dimensional Fund Advisors LP117,669$276.6K0.00%−457−0.4%Reduced
Voleon Capital Management LP82,074$192.9K0.00%+82,074New
Bank of New York Mellon Corp81,402$191.3K0.00%+100.0%Added
FMR LLC50,582$118.9K0.00%−67,440−57.1%Reduced
Barclays PLC47,982$112.8K0.00%−10,916−18.5%Reduced
Kohmann Bosshard Financial Services, LLC44,605$104.8K0.01%00.0%Unchanged
Nuveen, LLC44,280$104.1K0.00%00.0%Unchanged
Price T Rowe Associates Inc40,483$96.0K0.00%00.0%Unchanged
Mariner, LLC39,200$92.1K0.00%+39,200New
Two Sigma Investments, LP35,714$83.9K0.00%−99,421−73.6%Reduced
Rhumbline Advisers32,728$76.9K0.00%−326−1.0%Reduced
New York State Common Retirement Fund29,500$69.3K0.00%00.0%Unchanged
Deutsche Bank AG28,785$67.6K0.00%00.0%Unchanged
Wells Fargo & Company28,279$66.5K0.00%+4,059+16.8%Added
JB Capital Partners LP27,001$63.5K0.01%00.0%Unchanged
JPMorgan Chase & Co26,323$61.9K0.00%−338,121−92.8%Reduced
AQR Capital Management LLC24,583$57.8K0.00%+24,583New
BNP Paribas Arbitrage, SA23,454$55.1K0.00%−18,132−43.6%Reduced
PFG Investments, LLC23,004$54.1K0.00%+9,002+64.3%Added
Cubist Systematic Strategies, LLC20,026$47.1K0.00%+20,026New
Intech Investment Management LLC16,054$37.7K0.00%+540+3.5%Added
Mirae Asset Global ETFs Holdings Ltd.15,814$37.2K0.00%−2,786−15.0%Reduced
Red Door Wealth Management, LLC15,000$35.3K0.00%00.0%Unchanged
Russell Investments Group, Ltd.13,276$31.2K0.00%+12,694+2,181.1%Added
Susquehanna International Group, LLP11,703$27.5K0.00%−45,683−79.6%Reduced
Police & Firemen's Retirement System of New Jersey8,769$20.6K0.00%00.0%Unchanged
EverSource Wealth Advisors, LLC5,090$12.0K0.00%+5,090New
Tower Research Capital LLC (TRC)4,833$11.4K0.00%+4,431+1,102.2%Added
Ameritas Investment Partners, Inc.3,476$8.17K0.00%00.0%Unchanged
Legal & General Group Plc3,098$7.28K0.00%00.0%Unchanged
Group One Trading, L.P.3,075$7.23K0.00%+2,800+1,018.2%Added
Sterling Capital Management LLC2,349$5.52K0.00%+1,430+155.6%Added
California State Teachers Retirement System2,126$5.00K0.00%+2+0.1%Added
Point72 Asia (Singapore) Pte. Ltd.1,793$4.21K0.00%+1,793New
CWM, LLC1,688$4.00K0.00%+1,688New
McIlrath & Eck, LLC1,444$3.39K0.00%00.0%Unchanged
Amalgamated Bank1,163$3.00K0.00%00.0%Unchanged
Steward Partners Investment Advisory, LLC1,000$2.35K0.00%00.0%Unchanged
Citigroup Inc519$1.22K0.00%−13,301−96.2%Reduced
SRS Capital Advisors, Inc.399$9380.00%+399New
SWAN Capital LLC250$5880.00%00.0%Unchanged
Nisa Investment Advisors, LLC246$5780.00%+238+2,975.0%Added
Advisor Group Holdings, Inc.237$5690.00%00.0%Unchanged
Stephens Consulting, LLC231$5430.00%00.0%Unchanged
Bare Financial Services, Inc209$4910.00%+209New
MAI Capital Management170$4000.00%−100−37.0%Reduced
Rockefeller Capital Management L.P.160$3770.00%+160New
Fifth Third Bancorp70$1650.00%+70New
Allworth Financial LP19$450.00%+12+171.4%Added
IFP Advisors, Inc14$330.00%+14New
Essential Partners LLC8$190.00%+8New
SBI Securities Co., Ltd.4$90.00%00.0%Unchanged
Sunbelt Securities, Inc.3$70.00%+3New
Acadian Asset Management LLC0$00.00%−241,977−100.0%Sold out
Marshall Wace, LLP0$00.00%−190,397−100.0%Sold out
Thrivent Financial for Lutherans0$00.00%−116,248−100.0%Sold out
Engineers Gate Manager LP0$00.00%−72,806−100.0%Sold out
Susquehanna Fundamental Investments, LLC0$00.00%−45,906−100.0%Sold out
Millennium Management LLC0$00.00%−44,624−100.0%Sold out
Los Angeles Capital Management LLC0$00.00%−34,760−100.0%Sold out
Cetera Investment Advisers0$00.00%−25,181−100.0%Sold out
Meeder Asset Management Inc0$00.00%−16,116−100.0%Sold out
Sugar Maple Asset Management, LLC0$00.00%−13,000−100.0%Sold out
Gsa Capital Partners LLP0$00.00%−12,450−100.0%Sold out
Two Sigma Advisers, LP0$00.00%−11,400−100.0%Sold out
May Hill Capital, LLC0$00.00%−10,594−100.0%Sold out
SG Americas Securities, LLC0$00.00%−10,218−100.0%Sold out
Headlands Technologies LLC0$00.00%−901−100.0%Sold out
Raymond James Financial Inc0$00.00%−718−100.0%Sold out
Simplex Trading, LLC0$00.00%−616−100.0%Sold out
Federated Hermes, Inc.0$00.00%−241−100.0%Sold out
Keystone Global Partners, LLC0$00.00%−20−100.0%Sold out
South State Corp.0$00.00%−13−100.0%Sold out