ClearSign Technologies (CLIR) insider buys 500,000 common shares

Rhea-AI Filing Summary

John M. Pasquesi, a more than 10% owner of ClearSign Technologies Corp (CLIR), reported that Otter Capital LLC purchased 500,000 shares of common stock on July 22, 2026 at $3.54 per share, increasing its indirect holdings to 1,343,477 shares. These share amounts reflect a 1-for-10 reverse stock split of ClearSign’s common stock effective March 16, 2026, and Pasquesi is the managing member of Otter Capital LLC.

Insider Trade Summary

Net Buyer: 500,000 shares

Net Buy 1 txn

Insider PASQUESI JOHN M

Role 10% Owner

Bought 500,000 shs ($1.77M)

Type	Security	Shares	Price	Value
Purchase	Common Stock F1, F2	500,000	$3.54	$1.77M

Holdings After Transaction: Common Stock — 1,343,477 shares (Indirect, By Otter Capital LLC)

Footnotes (2)

1. F1. The Issuer effected a reverse stock split of its outstanding common stock at a ratio of 1-for-10, effective as of 12:01 a.m., Eastern Time, on March 16, 2026.
2. F2. The reporting person is the managing member of Otter Capital LLC.

Key Figures

Shares purchased: 500,000 shares Purchase price: $3.54 per share Indirect holdings after purchase: 1,343,477 shares +3 more

6 metrics

Shares purchased 500,000 shares Common stock purchased on July 22, 2026

Purchase price $3.54 per share Price for the July 22, 2026 common stock purchase

Indirect holdings after purchase 1,343,477 shares Common stock indirectly held by Otter Capital LLC after the transaction

Reverse stock split ratio 1-for-10 Reverse split of outstanding common stock effective March 16, 2026

Reverse stock split date March 16, 2026 Effective date of the 1-for-10 reverse stock split

Transaction date July 22, 2026 Date of common stock purchase reported by the more than 10% owner

Key Terms

reverse stock split, managing member, indirect

3 terms

reverse stock split financial

"The Issuer effected a reverse stock split of its outstanding common stock"

A reverse stock split reduces a company's number of outstanding shares while raising the price per share proportionally, so the total value of each investor's holding is unchanged; a 1-for-10 split turns 100 shares worth $1 each into 10 shares worth $10 each. Companies often do this to regain compliance with an exchange's minimum price rule or to attract investors who avoid very low-priced stocks.

managing member financial

"The reporting person is the managing member of Otter Capital LLC"

indirect financial

""ownership_type": "indirect" for the common stock position"

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 07/24/2026 - 04:46 PM Accepted by SEC EDGAR 07/24/2026 - 04:46 PM Learn about SEC filing dates

FAQ

What insider transaction did ClearSign Technologies (CLIR) report?

ClearSign Technologies (CLIR) reported that Otter Capital LLC, managed by John M. Pasquesi, purchased 500,000 shares of common stock at $3.54 per share. The Form 4 filing reflects this indirect ownership change for a more than 10% shareholder.

How many ClearSign (CLIR) shares does Otter Capital LLC hold after the transaction?

After the reported purchase, Otter Capital LLC indirectly holds 1,343,477 shares of ClearSign common stock. This post-transaction total, reported on the Form 4, already incorporates the company’s 1-for-10 reverse stock split effective March 16, 2026.

Who is John M. Pasquesi in relation to ClearSign Technologies (CLIR)?

John M. Pasquesi is disclosed as a more than 10% owner of ClearSign Technologies (CLIR) and the managing member of Otter Capital LLC. The reported common stock position is held indirectly through Otter Capital LLC rather than in his name personally.

When and at what price were the new ClearSign (CLIR) shares acquired?

The Form 4 shows the acquisition occurred on July 22, 2026 at a purchase price of $3.54 per share. This single transaction added 500,000 shares of ClearSign Technologies common stock to the indirect holdings of Otter Capital LLC.

What reverse stock split did ClearSign Technologies (CLIR) implement?

ClearSign Technologies implemented a 1-for-10 reverse stock split of its outstanding common stock, effective March 16, 2026. The share amounts reported in John M. Pasquesi’s Form 4, including total indirect holdings, are stated on a post-split basis according to the disclosure.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

PASQUESI JOHN M

(Last) (First) (Middle)

C/O OTTER CAPITAL

P.O. BOX 1503

(Street)

MANCHESTER-BY-THE-SEA MASSACHUSETTS 01944

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
ClearSign Technologies Corp [ CLIR ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
07/22/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	07/22/2026		P		500,000	A	$3.54	1,343,477(1)	I	By Otter Capital LLC(2)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The Issuer effected a reverse stock split of its outstanding common stock at a ratio of 1-for-10, effective as of 12:01 a.m., Eastern Time, on March 16, 2026.

2. The reporting person is the managing member of Otter Capital LLC.

	/s/ John M. Pasquesi	07/24/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)