Institutional HoldersBeta

Who holds a company, from every 13F filed for the quarter, one row per filer exactly as filed, against the latest share count the company reported.

ClearSign Technologies Corp

CIK 0001434524CLIR· quarter ending 2026-06-30

Shares outstanding

6,807,455

as of 2026-08-08 · 10-Q cover page, filed 2026-08-14

Held by 13F filers

466,128

6.8% of shares outstanding

Holders

+4 vs 2026-03-31 · 5 new, 1 exited

Value

$1.7M

shares +17.0% vs prior quarter

Share classes (cover page of the 10-Q filed 2026-08-14, as of 2026-08-08)

Class	Listed	Shares outstanding	Held by 13F filers	% of class	Holders	CUSIP
Common stock	CLIR · NASDAQ	6,807,455	466,128	6.8%	24	185064201

Each class is compared with its own share count; classes are not added together. A class that is not exchange-listed cannot be held by 13F filers.

Securities (CUSIPs held in 13F this quarter)

tick to combine

Count	CUSIP	Class (as filers write it)	Holders	Shares held	Class shares	% of class	Value	Options	Mapped via
	185064201	COM NEW	24	466,128	6,807,455	6.8%	$1.7M	—	prefix	holders →

Totals combine the ticked CUSIPs and update as you tick: common-stock classes by default; preferreds, notes, warrants and depositary shares are listed but not counted. "holders →" shows a single CUSIP on its own. Bonds are held as a principal amount, not shares. Options positions are never counted as holdings. 1 further CUSIPs map to this company (mostly bonds) but no 13F filer held them this quarter.

Top holders (24 of 24 · 185064201)

change vs 2026-03-31

#	Filer	Shares	% of class	Value	Change
1	VANGUARD CAPITAL MANAGEMENT LLC	105,429	1.55%	$387K	—
2	Cambridge Investment Research Advisors, Inc.	88,600	1.30%	$326K	+44,300 (+100.0%)
3	SIMON QUICK ADVISORS, LLC	60,314	0.89%	$221K	—
4	GEODE CAPITAL MANAGEMENT, LLC	51,457	0.76%	$189K	-6,226 (-10.8%)
5	Beacon Pointe Advisors, LLC	27,173	0.40%	$100K	—
6	VANGUARD FIDUCIARY TRUST CO	23,460	0.34%	$86K	—
7	HighTower Advisors, LLC	22,662	0.33%	$83K	+9,982 (+78.7%)
8	CITADEL ADVISORS LLC	20,565	0.30%	$75K	NEW
9	BlackRock, Inc.	19,503	0.29%	$72K	—
10	DDD Partners, LLC	12,000	0.18%	$44K	—
11	NORTHERN TRUST CORP	10,080	0.15%	$37K	NEW
12	Rockefeller Capital Management L.P.	8,120	0.12%	$30K	—
13	NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO	7,172	0.11%	$26K	—
14	WELLS FARGO & COMPANY/MN	2,125	0.03%	$8K	—
15	Gleason Group, Inc.	1,802	0.03%	$7K	—
16	Centerpoint Advisors, LLC	1,560	0.02%	$6K	—
17	Tower Research Capital LLC (TRC)	1,518	0.02%	$6K	+473 (+45.3%)
18	Vanguard Global Advisers, LLC	1,350	0.02%	$5K	—
19	ROYAL BANK OF CANADA	684	0.01%	$3K	NEW
20	DEUTSCHE BANK AG\	400	0.01%	$1K	—
21	UBS Group AG	100	0.00%	$367	NEW
22	BARCLAYS PLC	33	0.00%	$121	NEW
23	SBI Securities Co., Ltd.	12	0.00%	$44	+1 (+9.1%)
24	GROUP ONE TRADING LLC	9	0.00%	$33	—

Exited since 2026-03-31 (1 filers; largest 1 shown)

Creative Planning

−12,355

Large holders from 13D/13G (latest per reporting person, last 2 years)

Filed when a holder crosses 5% or changes materially, so often more current than the quarter-end 13F. Percentages are the filer's own, against the share count they used.

Reporting person	Form	Filed	Event	Shares	% of class
John M Pasquesi	SCHEDULE 13G/A	2026-07-24	2026-07-22	1,364,977	19.9%
Otter Capital LLC	SCHEDULE 13G/A	2026-07-24	2026-07-22	1,364,977	19.9%
clirSPV LLC	SCHEDULE 13D/A	2025-02-19	2025-02-14	1,714,544	3.3%
GPclirSPV LLC	SCHEDULE 13D/A	2025-02-19	2025-02-14	1,714,544	3.3%
HOFFMAN Robert Thurston Sr	SCHEDULE 13D/A	2025-02-19	2025-02-14	2,249,027	4.3%
Princeton Opportunity Management LLC	SCHEDULE 13D/A	2025-02-19	2025-02-14	1,714,544	3.3%

Source: SEC Form 13F-HR information tables for the quarter ending 2026-06-30 (filed within 45 days of quarter end; amendments applied; values normalised to dollars), the share count from the company's latest 10-K/10-Q XBRL cover page, and Schedule 13D/13G filings. Each row is a legal 13F filer as filed — related entities (e.g. Vanguard's advisers) are not merged. Retail brokerage accounts are not reported on 13F, so the remainder is mostly retail and insiders.