Trinseo PLC - Ordinary Shares, par value $0.01 per share (TSE)

Historical Holders from Q3 2019 to Q4 2025

Type / Class
Equity / Ordinary Shares, par value $0.01 per share
Symbol
TSE on NYSE
Shares outstanding
35,464,436
Price per share
$0.52
All holders as of 30 Sep 2025
Q3 2025
Total 13F shares
26,848,081
Total reported value
$60,426,503
% of total 13F portfolios
0%
Share change
-813,804
Value change
-$2,561,209
Number of holders
74
Price from insider filings
$0.52
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors

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
CastleKnight Master Fund LP 7.8% $7,219,850 2,766,226 CastleKnight Master Fund LP 30 Jun 2025
BlackRock, Inc. 6.3% $5,660,364 2,255,125 BlackRock, Inc. 30 Jun 2025
As of 30 Sep 2025, Trinseo PLC - Ordinary Shares, par value $0.01 per share (TSE) has 74 institutional shareholders filing 13F forms. They hold 26,848,081 shares. of 35,464,436 outstanding shares (76%) .

Top 25 institutional shareholders own 74% of the company.

Filer Ownership Nb Shares Share Change % Portfolio % Holdings Value
M&G PLC 22% 7,625,044 0% 0.08% $15,250,088
Nut Tree Capital Management, LP 9.9% 3,500,000 0% 1.9% $8,225,000
CastleKnight Management LP 7% 2,466,826 -11% 0.31% $5,797,041
BlackRock, Inc. 6.7% 2,369,672 +5.1% 0% $5,568,730
Owl Creek Asset Management, L.P. 4.7% 1,669,952 0% 0.45% $3,924,387
CHARLES SCHWAB INVESTMENT MANAGEMENT INC 4.2% 1,505,068 +56% 0% $3,536,910
BRIGHTLINE CAPITAL MANAGEMENT, LLC 3% 1,060,000 +3.7% 1% $2,491,000
ICON ADVISERS INC/CO 2.8% 1,000,000 +33% 0.51% $2,350,000
GEODE CAPITAL MANAGEMENT, LLC 2.4% 841,828 +2.3% 0% $1,978,715
VANGUARD GROUP INC 2.1% 755,643 -30% 0% $1,775,761
MORGAN STANLEY 1.3% 454,287 -2.9% 0% $1,067,574
STATE STREET CORP 1.2% 423,786 +11% 0% $995,897
BANK OF AMERICA CORP /DE/ 1% 363,641 +20% 0% $854,556
RENAISSANCE TECHNOLOGIES LLC 0.89% 314,700 +13% 0% $739,545
LAKEWOOD CAPITAL MANAGEMENT, LP 0.79% 281,279 0% 0.05% $661,006
NORTHERN TRUST CORP 0.76% 268,689 +1.1% 0% $631,419
ROYAL BANK OF CANADA 0.64% 227,821 -3.7% 0% $536,000
UBS Group AG 0.56% 199,804 +4.9% 0% $469,539
Alta Fundamental Advisers LLC 0.43% 152,974 0.17% $359,489
D. E. Shaw & Co., Inc. 0.42% 147,316 -53% 0% $346,193
Invesco Ltd. 0.37% 131,802 -32% 0% $309,735
GOLDMAN SACHS GROUP INC 0.36% 125,993 +7.8% 0% $296,084
DIMENSIONAL FUND ADVISORS LP 0.33% 117,669 -0.39% 0% $276,580
Voleon Capital Management LP 0.23% 82,074 0% $192,874
Bank of New York Mellon Corp 0.23% 81,402 +0.01% 0% $191,294

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 Investors
2025 Q4 1,063 $529 +$529 $0.52 2
2025 Q3 26,848,081 $60,426,503 -$2,561,209 $2.35 74
2025 Q2 27,680,017 $85,444,543 +$6,908,212 $3.12 80
2025 Q1 25,205,020 $95,192,408 +$227,707 $3.68 85
2024 Q4 24,965,599 $126,559,237 +$8,302,961 $5.10 95
2024 Q3 22,908,998 $116,233,553 -$3,239,619 $5.11 71
2024 Q2 25,261,145 $55,987,199 -$9,375,064 $2.31 95
2024 Q1 27,408,421 $105,280,782 -$20,330,972 $3.78 104
2023 Q4 38,619 $323,241 -$644 $8.37 2
2023 Q3 29,751,731 $241,766,679 -$38,370,058 $8.17 144
2023 Q2 32,521,085 $414,560,571 -$18,376,736 $12.67 139
2023 Q1 32,882,586 $686,740,624 +$11,327,601 $20.85 162
2022 Q4 32,695,947 $744,865,859 +$31,101,210 $22.71 176
2022 Q3 25,652,951 $467,427,129 -$48,477,734 $18.32 160
2022 Q2 34,015,467 $1,305,182,201 -$14,756,359 $38.46 181
2022 Q1 34,246,850 $1,642,330,528 -$26,275,223 $47.92 175
2021 Q4 35,029,671 $1,834,359,577 +$1,803,413,863 $52.46 169
2021 Q3 232,117 $12,490,120 +$12,441,531 $53.97 14
2021 Q2 900 $53,856 $0 $59.84 1
2021 Q1 900 $57,303 -$1,000 $63.67 1
2020 Q4 916 $47,089 $0 $56.86 2
2020 Q3 900 $23,076 $0 $25.64 1
2020 Q2 900 $19,944 +$19,944 $22.16 1
2019 Q4 0 $0 -$32,728 $0.52 0
2019 Q3 762 $32,728 +$32,728 $42.95 1