Security Snapshot

TRINSEO PLC - Common Stock (TSE) Institutional Ownership

CUSIP: G9059U107

13F Institutional Holders and Ownership History from Q3 2019 to Q3 2026

13F reference period

Q2 2026

Institutions Reporting

3

Shares (Excl. Options)

462.64KFull value: 462,635 · shares · 30 Jun 2026

Price

$0.00

The headline uses the Q2 2026 reference period after its reporting deadline. Available reports may still be incomplete or amended. Newer periods in the history table contain incoming reports and may be incomplete.

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Security type / class
Equity / Common Stock
Symbol
TSE
All holders as of 30 Jun 2026
Q2 2026
Total 13F shares
462,635
Latest holder snapshot 5 signals
Total 13F value
$740
Portfolio coverage rank
0%
Share change
+359,163
Value change
-$4,729
Number of holders
3
Issuer context Names, identifiers, and filing context for this profile. 3 identity fields
Shares outstanding
36,916,143
SEC-reported price per share
$0.01
Insider filing price
$0.01
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Filing notes and source

Key facts

  • TSE - TRINSEO PLC - Common Stock is tracked under CUSIP G9059U107.
  • 3 institutions reported positions in Q2 2026.
  • 3 significant owners is listed from Schedule 13D/13G reporting.

Change

  • Holder count moved from 14 to 3 between Q1 2026 and Q2 2026.
  • SEC-reported value moved from
    $11.03KFull value: $11,025 · USD · 31 Mar 2026
    to $740.

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

Latest holder context comes from 3 institutions filings for Q2 2026.

Open SEC evidence

Security key

G9059U107

13F reference period

Q2 2026

13F holders

3

13D/G owners

3

CIK / CUSIP context first

Open Q2 2026 holders TSE full holder history Trinseo PLC SEC filings Trinseo PLC company facts Trinseo PLC insider transactions

Broader feeds

Latest 13F filings Latest 13D/G filings All securities

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
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
BlackRock, Inc. 0.3% -100% $1,377 -$27,940 105,889 -95% BlackRock, Inc. 30 Sep 2026
As of 30 Jun 2026, 3 institutional investors reported holding
462.64KFull value: 462,635 · shares · 30 Jun 2026
shares of TRINSEO PLC - Common Stock (TSE). This represents 1.3% of the company’s total
36.92MFull value: 36,916,143 · shares · Stored outstanding share count
outstanding shares.

Quarter history

Institutional holders across reporting periods

Holder count, reported shares/value, and median price by quarter.

Periods
28
Headline period
Q2 2026
Rows shown
1-25 of 28
Period 13F Shares, Excl. Options Value, Excl. Options Value Change Price (Median) Investors
2026 Q3 412,655 $5,365 -$71 $0.01 1
2026 Q2 462,635 $740 -$4,729 $0.00 3
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
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