Trinseo PLC (TSE) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

35,967,213Shares Outstanding

14,421,634Shares held by institutions

$4,614,923Value of institutional holdings

68.51%Institutional ownership %

-2.48%Shares Changed QoQ

70No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

According to SEC filings for the period ending December 2025, Trinseo PLC (NYSE:TSE) is held by 70 institutional firms.

Trinseo saw its institutional ownership percentage fell to 68.5% in December 2025 from 74.6% in September 2025.
On a quarter-over-quarter basis, institutional holdings shifted by -2.48%, with a year-over-year a decrease of 27.08% in the count of filers.
Among the 70 institutional holders of Trinseo, 26 added to their stakes while 22 trimmed their positions and 22 held steady.
The total number of shares held by institutions in Trinseo decreased to 24.64Mn as of December 2025, a net change of down by 625.61K shares quarter on quarter, and down 325.33K shares year over year.
The top institutional stake in Trinseo as of December 31, 2025 belongs to M&G Plc, which owns 7.63Mn shares, or 21.20% of the company.
Among the most significant buyers of Trinseo during December 2025 were CHARLES SCHWAB INVESTMENT MANAGEMENT INC (586.06K), GSA CAPITAL PARTNERS LLP (511.34K), GOLDMAN SACHS GROUP INC (454.63K), DEUTSCHE BANK AG\ (96.83K), MORGAN STANLEY (82.14K).
Leading sellers of Trinseo stock in December 2025 included CastleKnight Management LP (1.95Mn), BANK OF AMERICA CORP /DE/ (323.84K), ROYAL BANK OF CANADA (225.36K), RENAISSANCE TECHNOLOGIES LLC (38.60K), NORTHERN TRUST CORP (22.89K).
The top 10 institutional holders of Trinseo for the quarter ending December 2025 included M&G Plc (7.63Mn), Nut Tree Capital Management, LP (3.50Mn), BlackRock, Inc. (2.41Mn), CHARLES SCHWAB INVESTMENT MANAGEMENT INC (2.09Mn), Owl Creek Asset Management, L.P. (1.67Mn), ICON ADVISERS INC/CO (1.00Mn), GEODE CAPITAL MANAGEMENT, LLC (841.72K), VANGUARD GROUP INC (762.83K), GOLDMAN SACHS GROUP INC (580.62K), MORGAN STANLEY (536.42K).

70 Institutional Holders

14,421,634 Total Shares Held

Rows:

Download Data

Owner Name	Date	Shares Held	Change (QoQ)	Change (%)	Value (USD)
M&G Plc	31 Dec, 2025	7,625,044	0	0.00%	$3,789,647.00
Nut Tree Capital Management, LP	31 Dec, 2025	3,500,000	0	0.00%	$1,739,500.00
BlackRock, Inc.	31 Dec, 2025	2,413,178	43,506	1.84%	$1,199,349.00
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	31 Dec, 2025	2,091,125	586,057	38.94%	$1,039,289.00
Owl Creek Asset Management, L.P.	31 Dec, 2025	1,669,952	0	0.00%	$829,966.00
ICON ADVISERS INC/CO	31 Dec, 2025	1,000,000	0	0.00%	$497,000.00
GEODE CAPITAL MANAGEMENT, LLC	31 Dec, 2025	841,720	-108	-0.01%	$418,419.00
VANGUARD GROUP INC	31 Dec, 2025	762,828	7,185	0.95%	$379,126.00
GOLDMAN SACHS GROUP INC	31 Dec, 2025	580,623	454,630	360.84%	$288,569.00
MORGAN STANLEY	31 Dec, 2025	536,422	82,135	18.08%	$266,601.00
CastleKnight Management LP	31 Dec, 2025	516,826	-1,950,000	-79.05%	$256,863.00
GSA CAPITAL PARTNERS LLP	31 Dec, 2025	511,342	511,342	0.00%	$254.00
STATE STREET CORP	31 Dec, 2025	478,033	54,247	12.80%	$237,582.00
LAKEWOOD CAPITAL MANAGEMENT, LP	31 Dec, 2025	281,279	0	0.00%	$139,796.00
RENAISSANCE TECHNOLOGIES LLC	31 Dec, 2025	276,100	-38,600	-12.27%	$137,222.00
NORTHERN TRUST CORP	31 Dec, 2025	245,801	-22,888	-8.52%	$122,163.00
UBS Group AG	31 Dec, 2025	184,497	-15,307	-7.66%	$91,695.00
Alta Fundamental Advisers LLC	31 Dec, 2025	152,974	0	0.00%	$76,028.00
DEUTSCHE BANK AG\	31 Dec, 2025	125,610	96,825	336.37%	$62,805.00
DIMENSIONAL FUND ADVISORS LP	31 Dec, 2025	98,606	-19,063	-16.20%	$49,071.00

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