Insider Transactions Reported by 13 Insiders of ClearSign Technologies Corp

Symbol: CLIR on Nasdaq
Location: Tulsa, OK

Quick Takeaways

CLIR - ClearSign Technologies Corp has 13 insiders with reported activity on this page.
No net insider buy/sell flow is currently reported for the last year.
Recent transaction rows are available for direct filing-level review.

What Changed

No meaningful buy/sell imbalance is currently visible in the one-year window.
Activity will update as new Forms 3/4/5 are filed.

Why This Matters

This page gives a plain-language issuer insider context before you inspect transaction-level evidence.
Use the filing links below to verify timestamps, codes, and ownership impacts directly from SEC forms.

Official SEC Source

Filed on Form 4

Issuer insider activity is sourced from SEC Forms 3, 4, and 5.

See Original Filing

Insider trading overview

Last 12 months

Insider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 09 Apr 2025.

Buys

Shares: 0

Insiders: 0

Sells

Shares: 0

Insiders: 0

Net

Shares: 0

Insiders: 0

Window (months)	Buy $	Sell $	Net $
0-3	$0	$0	$0
3-6	$0	$0	$0
6-9	$0	$0	$0
9-12	$0	$0	$0

ClearSign Technologies Corp executives and other stock owners filed with the SEC include:

Name	Relationship	Holdings Value	Valuation	Report Date
Robert T. Hoffman Sr.	10%+ Owner	$17,451,117	Mixed	24 Jun 2024
John M. Pasquesi	10%+ Owner	$6,742,758	Mixed	14 Feb 2025
Anthony DiGiandomenico	Director	$332,131	Mixed	31 Mar 2026
Judith S. Schrecker	Director	$308,297	Mixed	01 Jul 2025
Colin J. Deller	Chief Executive Officer	$155,492	Mixed	26 Feb 2026
Catharine de Lacy	Director	$149,314	Mixed	01 Jul 2025
Gary J. DiElsi	Director	$129,912	Mixed	02 Oct 2023
Brent Hinds	Chief Financial Officer	$108,897	Mixed	26 Feb 2026
David M. Maley	Director	$76,735	Mixed	01 Jul 2025
Gil Todd Silva	Director	$51,844	Mixed	31 Mar 2026
Susanne Meline	Director	$48,014	Mixed	03 Jan 2023
Bruce A. Pate	Director	$16,019	Mixed	01 Jul 2022
Lou Basenese	Director	$12,200	Mixed	31 Mar 2026

Top shareholders of ClearSign Technologies Corp (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.

Methodology: rows are grouped by holder and ranked by the holder's primary source value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

Holder	Source	Role / Reporting	Ownership %	Shares	Holdings Value	12M Net Δ	As of	Details
Robert T. Hoffman Sr.	3/4/5	10%+ Owner	— mixed-class rows	24,795,027 mixed-class rows	$17,451,117	—	24 Jun 2024	3/4/5
John M. Pasquesi	3/4/5 13D/G	10%+ Owner	20% from 13D/G	8,434,774	$6,742,758	—	14 Feb 2025	3/4/5 13D/G
clirSPV LLC	13D/G	HOFFMAN Robert Thurston Sr	4.3%	2,249,027	$1,371,906	$0	14 Feb 2025	13D/G
VANGUARD GROUP INC	13F	Company	2.4%	1,322,980	$735,577	—	31 Dec 2025	13F
SIMON QUICK ADVISORS, LLC	13F	Company	1.1%	603,149	$335,411	—	31 Dec 2025	13F
Anthony DiGiandomenico	3/4/5	Director	— mixed-class rows	547,502 mixed-class rows	$332,131	—	31 Mar 2026	3/4/5
Judith S. Schrecker	3/4/5	Director	— class O/S missing	431,957	$308,297	—	01 Jul 2025	3/4/5
GEODE CAPITAL MANAGEMENT, LLC	13F	Company	0.95%	523,109	$290,958	—	31 Dec 2025	13F
Cambridge Investment Research Advisors, Inc.	13F	Company	0.81%	443,000	$246,000	—	31 Dec 2025	13F
Colin J. Deller	3/4/5	Chief Executive Officer	0.5%	276,874	$155,492	—	26 Feb 2026	3/4/5
Catharine de Lacy	3/4/5	Director	— class O/S missing	218,957	$149,314	—	01 Jul 2025	3/4/5
Gary J. DiElsi	3/4/5	Director	— class O/S missing	115,993	$129,912	—	02 Oct 2023	3/4/5
BlackRock, Inc.	13F	Company	0.36%	199,304	$110,833	—	31 Dec 2025	13F
Brent Hinds	3/4/5	Chief Financial Officer	— mixed-class rows	217,833 mixed-class rows	$108,897	—	26 Feb 2026	3/4/5
David M. Maley	3/4/5	Director	— class O/S missing	105,443	$76,735	—	01 Jul 2025	3/4/5
Creative Planning	13F	Company	0.25%	136,053	$75,659	—	31 Dec 2025	13F
HighTower Advisors, LLC	13F	Company	0.23%	126,809	$70,518	—	31 Dec 2025	13F
DDD Partners, LLC	13F	Company	0.22%	120,000	$66,732	—	31 Dec 2025	13F
SUSQUEHANNA INTERNATIONAL GROUP, LLP	13F	Company	0.19%	104,759	$58,257	—	31 Dec 2025	13F
Gil Todd Silva	3/4/5	Director	— mixed-class rows	130,933 mixed-class rows	$51,844	—	31 Mar 2026	3/4/5
STATE STREET CORP	13F	Company	0.16%	88,989	$49,487	—	31 Dec 2025	13F
Susanne Meline	3/4/5	Director	— mixed-class rows	133,870 mixed-class rows	$48,014	—	03 Jan 2023	3/4/5
Rockefeller Capital Management L.P.	13F	Company	0.15%	81,209	$45,160	—	31 Dec 2025	13F
RENAISSANCE TECHNOLOGIES LLC	13F	Company	0.14%	77,800	$43,265	—	31 Dec 2025	13F
NORTHERN TRUST CORP	13F	Company	0.13%	74,020	$41,163	—	31 Dec 2025	13F
NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO	13F	Company	0.13%	71,730	$39,889	—	31 Dec 2025	13F
Disciplined Investments, LLC	13F	Company	0.1%	55,886	$31,078	—	31 Dec 2025	13F
Americana Partners, LLC	13F	Company	0.1%	55,000	$30,586	—	31 Dec 2025	13F
RAYMOND JAMES FINANCIAL INC	13F	Company	0.09%	51,847	$28,832	—	31 Dec 2025	13F
INTEGRITY ALLIANCE, LLC.	13F	Company	0.07%	39,524	$21,979	—	31 Dec 2025	13F
PREVAIL INNOVATIVE WEALTH ADVISORS, LLC	13F	Company	0.07%	38,306	$21,302	—	31 Dec 2025	13F
HIGHLAND CAPITAL MANAGEMENT, LLC	13F	Company	0.06%	32,454	$18,048	—	31 Dec 2025	13F
XTX Topco Ltd	13F	Company	0.05%	29,015	$16,135	—	31 Dec 2025	13F
Bruce A. Pate	3/4/5	Director	— mixed-class rows	84,803 mixed-class rows	$16,019	—	01 Jul 2022	3/4/5
TWO SIGMA SECURITIES, LLC	13F	Company	0.05%	26,794	$14,900	—	31 Dec 2025	13F
JANE STREET GROUP, LLC	13F	Company	0.04%	23,825	$13,250	—	31 Dec 2025	13F
Chicago Partners Investment Group LLC	13F	Company	0.03%	18,000	$12,528	—	31 Dec 2025	13F
Lou Basenese	3/4/5	Director	— mixed-class rows	93,290 mixed-class rows	$12,200	—	31 Mar 2026	3/4/5
WELLS FARGO & COMPANY/MN	13F	Company	0.04%	21,050	$11,706	—	31 Dec 2025	13F
Gleason Group, Inc.	13F	Company	0.03%	18,018	$10,020	—	31 Dec 2025	13F
HRT FINANCIAL LP	13F	Company	0.03%	17,578	$9,000	—	31 Dec 2025	13F
Centerpoint Advisors, LLC	13F	Company	0.03%	15,700	$9,000	—	31 Dec 2025	13F
Tower Research Capital LLC (TRC)	13F	Company	0.03%	13,795	$7,671	—	31 Dec 2025	13F
FLAX POND CAPITAL, LLC	13F	Company	0.02%	13,549	$7,535	—	31 Dec 2025	13F
SIMPLEX TRADING, LLC	13F	Company	0.01%	7,211	$4,010	—	31 Dec 2025	13F
DEUTSCHE BANK AG\	13F	Company	0.01%	4,000	$2,240	—	31 Dec 2025	13F
UBS Group AG	13F	Company	0%	1,225	$681	—	31 Dec 2025	13F
BANK OF AMERICA CORP /DE/	13F	Company	0%	907	$504	—	31 Dec 2025	13F
SBI Securities Co., Ltd.	13F	Company	0%	103	$57	—	31 Dec 2025	13F
TUCKER ASSET MANAGEMENT LLC	13F	Company	0%	39	$22	—	31 Dec 2025	13F

Recent Insider Transactions by Companies or Individuals for ClearSign Technologies Corp

Showing up to 300 most recent insider transactions from the last 12 months.

Insider	Symbol	Class	Transaction	%	Shares	Shares Owned	Date	Ownership
Lou Basenese	CLIR	Non-Statutory Stock Options	Award		3,024	3,024	31 Mar 2026	Direct
Gil Todd Silva	CLIR	Non-Statutory Stock Options	Award		3,024	3,024	31 Mar 2026	Direct
Gil Todd Silva	CLIR	Restricted Stock Units	Award	2.86%	3,440	123,909	31 Mar 2026	Direct
Anthony DiGiandomenico	CLIR	Non-Statutory Stock Options	Award		3,024	3,024	31 Mar 2026	Direct
G. Todd Silva	CLIR	Common Stock	Purchase	100%	2,000	4,000	17 Mar 2026	Direct
G. Todd Silva	CLIR	Common Stock	Purchase		2,000	2,000	16 Mar 2026	Direct
Colin J. Deller	CLIR	Common Stock	Tax liability	-27.5%	-105,022	276,874	26 Feb 2026	Direct
Colin J. Deller	CLIR	Common Stock	Award	122.2%	210,043	381,896	26 Feb 2026	Direct
Brent Hinds	CLIR	Common Stock	Tax liability	-10.8%	-20,761	170,824	26 Feb 2026	Direct
Brent Hinds	CLIR	Common Stock	Award	42%	56,645	191,585	26 Feb 2026	Direct
Brent Hinds	CLIR	Restricted Stock Unit	Award		47,009	47,009	26 Feb 2026	Direct
Brent Hinds	CLIR	Common Stock	Tax liability	-2.01%	-2,765	134,940	22 Feb 2026	Direct
Brent Hinds	CLIR	Common Stock	Options Exercise	5.8%	7,547	137,705	22 Feb 2026	Direct
Brent Hinds	CLIR	Restricted Stock Unit	Options Exercise	-50%	-7,547	7,547	22 Feb 2026	Direct
Brent Hinds	CLIR	Common Stock	Tax liability	-2.56%	-3,413	130,158	20 Feb 2026	Direct
Brent Hinds	CLIR	Common Stock	Options Exercise	7.5%	9,315	133,571	20 Feb 2026	Direct
Brent Hinds	CLIR	Restricted Stock Unit	Options Exercise	-33.3%	-9,315	18,631	20 Feb 2026	Direct
Brent Hinds	CLIR	Common Stock	Tax liability	-2.9%	-3,711	124,256	02 Feb 2026	Direct
Brent Hinds	CLIR	Common Stock	Options Exercise	8.59%	10,127	127,967	02 Feb 2026	Direct
Brent Hinds	CLIR	Restricted Stock Unit	Options Exercise	-50%	-10,127	10,127	02 Feb 2026	Direct
Lou Basenese	CLIR	Restricted Stock Units	Award	53.9%	24,621	70,266	01 Oct 2025	Direct
Gill Todd Silva	CLIR	Restricted Stock Units	Award	28.6%	26,830	120,469	01 Oct 2025	Direct
David M. Maley	CLIR	Restricted Stock Units	Award	9.85%	9,452	105,443	01 Jul 2025	Direct
Gill Todd Silva	CLIR	Restricted Stock Units	Award	53.5%	32,638	93,639	01 Jul 2025	Direct
Catharine de Lacy	CLIR	Restricted Stock Units	Award	17.2%	32,175	218,957	01 Jul 2025	Direct
Judith S. Schrecker	CLIR	Restricted Stock Units	Award	12%	46,296	431,957	01 Jul 2025	Direct
Lou Basenese	CLIR	Restricted Stock Units	Award	317.9%	34,722	45,645	01 Jul 2025	Direct
Lou Basenese	CLIR	Restricted Stock Units	Award		10,923	10,923	22 May 2025	Direct

* An asterisk sign (*) next to the price indicates that the price is likely invalid.