$TSEOQ

$0.01 +$0.00 (0.0%) Close

$TSEOQ Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 36.6M shares outstanding

Who owns TSEOQ?

By type of holder

Institutions 1.3% Insiders 0.0% Everyone else 98.7%

Concentration Top 6 holders own 1.3%

GAMMA Investing LLC 1.1% · Kohmann Bosshard Financial Services, LLC 0.1%

Institutional ownership

1.3%

+1.0 pts vs last qtr

Institutional holders

-8 vs last qtr

Net shares bought

+357.7K

by institutions in Q2 2026

New / sold out

0 / 8

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

GAMMA Investing LLC +410.5K

Biggest sellers in Q2 2026

Nuveen, LLC SOLD OUT −44.3K
Barclays PLC SOLD OUT −4.8K

Who is planning to sell?

No insider has filed a notice of proposed sale (Form 144) for Trinseo PLC in the last 12 months.

Is your stake being diluted?

Diluted share count, FY2016–FY2025

−24.6%

−3.09% a year

Each share's claim on the business

+32.7%

grew without buying or selling a share

Spent on buybacks vs paid in stock

$792M vs $148M

over 10 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years0% 3–5 years0% 1–3 years10% Under 1 year90%

Quarterly turnover

220.7%

of institutional shares changed hands

Top 10 managers, median time held

3 quarters

Super Investors

Investment managers reporting TSEOQ on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
GI GAMMA Investing LLC	412.7K	1.13%	+410.5K (+19111.1%)	Q4 '25	0.0%
Shares held by quarter Peak holding412.7K (Q2'26) Change over 8 quarters+412.7K Share of the company1.130% GAMMA Investing LLC's full portfolio →
KB Kohmann Bosshard Financial Services, LLC	44.6K	0.12%	Unchanged	2023	0.0%
Shares held by quarter Peak holding44.6K (Q1'25) Change over 8 quarters+10.0K Share of the company0.120% Kohmann Bosshard Financial Services, LLC's full portfolio →

GAMMA Investing LLC

412.7K

% of company

1.13%

Change vs last qtr

+410.5K (+19111.1%)

Held since

Q4 '25

Kohmann Bosshard Financial Services, LLC

44.6K

% of company

0.12%

Change vs last qtr

Unchanged

Held since

2023

9 more super investors behind a free account

See every manager holding Trinseo PLC, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting TSEOQ on Form N-PORT; together they hold 2.5% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
IR Invesco RAFI US 1500 Small-Mid ETF Invesco Exchange-Traded Fund Trust	$23.2K	51.5K	0.14%	0.00%	January 31, 2026
DU Dimensional U.S. Small Cap ETF Dimensional ETF Trust	$6.98K	15.5K	0.04%	0.00%	January 31, 2026

Invesco RAFI US 1500 Small-Mid ETF

Invesco Exchange-Traded Fund Trust

Position value

$23.2K

% of company

0.14%

% of the fund

0.00%

As of

January 31, 2026

Dimensional U.S. Small Cap ETF

Dimensional ETF Trust

Position value

$6.98K

% of company

0.04%

% of the fund

0.00%

As of

January 31, 2026

16 more funds behind a free account

See every fund holding Trinseo PLC and how much of the fund the position is.

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