$CLIR

$2.48 -$0.01 (0.4%) Close

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

Ownership

13F as of Q2 2026 · 6.8M shares outstanding

Who owns CLIR?

By type of holder

Institutions 0.0% Insiders 20.9% Everyone else 79.1%

Concentration Top 10 holders own 129.6%

HOFFMAN Robert Thurston Sr 33.0% · clirSPV LLC 25.2%

Institutional ownership

0.0%

0.0 pts vs last qtr

Institutional holders

0 vs last qtr

Net shares bought

by institutions in Q2 2026

New / sold out

0 / 0

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

None.

Biggest sellers in Q2 2026

None.

Who is planning to sell?

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

Is your stake being diluted?

Diluted share count, FY2021–FY2025

+76.3%

+15.23% a year

Each share's claim on the business

−43.3%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $3.09M

over 5 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

No 13F manager reports holding CLIR.

Super Investors

Investment managers reporting CLIR on Form 13F

No 13F manager reports holding CLIR yet.

Institutional Funds

Mutual funds and ETFs reporting CLIR on Form N-PORT; together they hold 22.1% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$328K	590.3K	8.67%	0.00%	December 31, 2025
VE Vanguard Extended Market Index Fund Vanguard Index Funds	$258K	464.0K	6.82%	0.00%	December 31, 2025

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$328K

% of company

8.67%

% of the fund

0.00%

As of

December 31, 2025

Vanguard Extended Market Index Fund

Vanguard Index Funds

Position value

$258K

% of company

6.82%

% of the fund

0.00%

As of

December 31, 2025

5 more funds behind a free account

See every fund holding ClearSign Technologies Corp and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
HR HOFFMAN Robert Thurston Sr 5%+ holder 13D · 4.3%	2.2M	33.04%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company33.040% Disclosed stake13D · 4.3% View the 13D/G filing →
C clirSPV LLC 5%+ holder 13D · 3.3%	1.7M	25.19%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company25.190% Disclosed stake13D · 3.3% View the 13D/G filing →

HOFFMAN Robert Thurston Sr

5%+ holder13D · 4.3%

2.2M

% of company

33.04%

Change vs last qtr

—

Held since

—

clirSPV LLC

5%+ holder13D · 3.3%

1.7M

% of company

25.19%

Change vs last qtr

—

Held since

—

8 more holders behind a free account

See every insider and 5%+ holder of ClearSign Technologies Corp.

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