NasdaqTechnologyIndustrial Instruments For Measurement, Display, and ControlTULSA, OK

ClearSign Technologies Corporation CLIR

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Estimated market cap $15.66M6.81M shares, shares as of Aug 8, 2026CIK 1434524

Insider trades, 12 mo

5 buys · 0 sells

$1.80M bought, open market

Congress trades, 24 mo

—

No disclosed trades

13F holders, Q3 2026

5.5% of shares · 3 added

13F holders

…

Lobbying, 12 mo

—

No lobbying filings

Federal contracts, 12 mo

—

None matched

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Latest 10-Q

Q2 2026

What changed in ClearSign Technologies Corporation's latest quarterly report, compared with the one before.

Filed Aug 14, 2026 · Quarter ended Jun 30, 2026

Compared with the 10-Q for the quarter ended Mar 31, 2026. Sections compared: management's discussion, risk factors, legal proceedings and controls and procedures.

Read the 10-Q on sec.gov ↗Filing index ↗

Latest 10-Q

What changed in ClearSign Technologies Corporation's latest quarterly report, compared with the one before.

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Insider trades

5 in 12 mo

Open-market trades from Form 4. 10b5-1 marks a plan set in advance.

No open-market insider trades reported since Jul 22, 2026. Insiders have two business days to file.

Recent insider trades

John M. Pasquesi 10% owner	Jul 22 Form 4 ↗	Buy	+$1.8M 500,000 sh @ $3.54	-30.2%
Gil Todd Silva Director	Apr 23 Form 4 ↗	Buy	+$5,250 1,000 sh @ $5.25	-61.9%
Gil Todd Silva Director	Apr 23 Form 4 ↗	Buy	+$5,320 1,000 sh @ $5.32	-61.9%
Gil Todd Silva Director	Mar 17 Form 4 ↗	Buy	+$8,400 2,000 sh @ $4.20	-55.5%
Gil Todd Silva Director	Mar 16 Form 4 ↗	Buy	+$8,720 2,000 sh @ $4.36	-59.9%

All CLIR insider trades →Planned sales (Form 144): see notices

Insider trades

Open-market trades from Form 4. 10b5-1 marks a plan set in advance.

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13F holders

371,826 shares

16 funds report CLIR. Values checked against market prices.

Funds own 6.9% of shares (Q2 2026)

26 funds hold the stock.

Q3 2026: 5.5% · 5,560 of ~8,900 funds reported so far

Q1 20267.4%
Q2 20266.9%
Q3 2026 (so far)5.5%

Q3 2026. 1 new, 3 added to, 2 trimmed, 11 exited since Q2 2026.

Top 13F holders
#
1	Vanguard Capital Management LLC 13F ↗	105,429	$374.3K	unchanged
2	Simon Quick Advisors, LLC 13F ↗	60,314	$214.1K	unchanged
3	Geode Capital Management, LLC 13F ↗	51,457	$182.7K	unchanged
4	Cambridge Investment Research Advisors, Inc. 13F ↗	44,300	$157.0K	-50.0%
5	Vanguard Fiduciary Trust Co 13F ↗	36,447	$129.4K	+55.4%
6	HighTower Advisors, LLC 13F ↗	22,662	$80.5K	unchanged
7	BlackRock, Inc. 13F ↗	19,503	$69.2K	unchanged
8	DDD Partners, LLC 13F ↗	12,000	$42.6K	unchanged
9	Rockefeller Capital Management L.P. 13F ↗	8,120	$28.8K	unchanged
10	Northwestern Mutual Wealth Management Co 13F ↗	7,172	$25.5K	unchanged

One of these funds reports its values in thousands of dollars; its figures are shown in dollars.

Download CSV Every fund that holds CLIR, not only these ten. A download holds at most 10,000 rows; narrow the filters to get a smaller slice.

13F holders

Funds that report this stock, checked against market prices.

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Trades by members of Congress

Disclosed in dollar ranges, up to 45 days after the trade.

No recent congressional trades for this company.

Trades by members of Congress

Disclosed in dollar ranges, up to 45 days after the trade.

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Lobbying

What ClearSign Technologies Corporation and its lobbying firms report each quarter.

No recent lobbying filings for this company.

Lobbying

What ClearSign Technologies Corporation and its lobbying firms report each quarter.

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Institutional ownership over time

How many funds reported holding the stock at the end of each quarter, and how many shares they held between them.

Funds holding the stock

Shares they report

Funds holding the stock by quarter

Q1 2026	20	—	398,491	$1.7M
Q2 2026	26	+6	467,215	$1.7M
Q3 2026	16	-10	371,826	$1.3M

Each point is a quarter-end, from Q1 2026 to Q3 2026. A fund's 13F lists its long positions in US-listed securities as of the last day of the quarter and arrives up to 45 days later, so each point shows holdings at quarter-end, not on the day they were reported.

Common shares only; options and bonds are left out. When a fund amends a report, the amended version is the one counted.

The history follows the company's current CUSIP number (185064201). If the company's shares were ever re-issued under a different CUSIP, the quarters before the change are not part of this series, so the first point (Q1 2026) can be later than the stock's first appearance in 13F reports.

Share counts are adjusted for stock splits; none took place between these quarters. Values are in dollars as reported at the time and are not adjusted.

A quarter appears once our daily update has built its summary. If a summary cannot be built, older reports are kept and the chart shows the quarters it has until the next update repairs it.

Institutional ownership over time

How many funds reported holding the stock at the end of each quarter, and how many shares they held between them.

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More filings and data

Each opens the table.

Ownership stakes1 in 12 mo 8-K events2 in 90 days Patents2 patents granted Short interestFINRA · updated Oct 15 Planned insider salesNone in 12 mo Executive pay3 fiscal years Wikipedia attentionNone on record SEC enforcementNone on record IPO history3 registrations Ownership stakes…8-K events…Patents…Short interest…Planned insider sales…Executive pay…Wikipedia attention…SEC enforcement…

About the company

The basics from the company’s SEC registration.

Legal name: ClearSign Technologies Corp
Address: 8023 E. 63RD PLACE, SUITE 101, TULSA, OK 74133
Phone: (918) 500-7312
Fiscal year ends: Dec 31
Filer category: Non-accelerated filer, smaller reporting company
Incorporated in: DE
Listed as: CLIR (Nasdaq)
Former names: CLEARSIGN COMBUSTION CORP (until 2019)
SEC filings: All filings on SEC EDGAR ↗

About the company

The basics from the company’s SEC registration.

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$2.30+$0.04 (+1.77%) Nov 13 close

1M3M1Y

Oct 13, 2026Low $2.26 · High $2.88Nov 13, 2026

Aug 13, 2026Low $2.26 · High $4.84Nov 13, 2026

Nov 13, 2025Low $2.26 · High $8.82Nov 13, 2026

Congress purchase Congress sale Insider sale over $1M

Adjusted for stock splits; not for dividends. The stock split 1-for-10 on Mar 16, 2026; earlier prices are shown divided by the split ratio. Where prices come from.

Live chart

Intraday and historical prices from TradingView. Quotes may be delayed.

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Information, not investment advice. Company matching is automatic; check the source before relying on one row.