Brent Hinds - 20 Feb 2026 Form 4 Insider Report for ClearSign Technologies Corp (CLIR)

Signature
/s/ Brent Hinds
Issuer symbol
CLIR
Transactions as of
20 Feb 2026
Net transactions value
-$3,675
Form type
4
Filing time
24 Feb 2026, 19:00:12 UTC
Previous filing
04 Feb 2026
Next filing
02 Mar 2026

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Hinds Brent Chief Financial Officer 8023 E. 63RD PLACE, SUITE 101, TULSA /s/ Brent Hinds 24 Feb 2026 0001888082

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction CLIR Common Stock Options Exercise +9,315 +7.5% 133,571 20 Feb 2026 Direct F1
transaction CLIR Common Stock Tax liability $2,030 -3,413 -2.6% $0.5949 130,158 20 Feb 2026 Direct F2
transaction CLIR Common Stock Options Exercise +7,547 +5.8% 137,705 22 Feb 2026 Direct F3
transaction CLIR Common Stock Tax liability $1,645 -2,765 -2% $0.5949 134,940 22 Feb 2026 Direct F4

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction CLIR Restricted Stock Unit Options Exercise $0 -9,315 -33% $0.000000 18,631 20 Feb 2026 Common Stock 9,315 Direct F5, F6
transaction CLIR Restricted Stock Unit Options Exercise $0 -7,547 -50% $0.000000 7,547 22 Feb 2026 Common Stock 7,547 Direct F7, F8
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Reflects the vesting of 9,315 restricted stock units ("RSUs") out of the 27,946 RSUs granted to the reporting person on February 20, 2025, into an equal number of shares of the Company's common stock, without the payment of any consideration, pursuant to the Company's 2021 Equity Incentive Plan.
F2 Represents the payment of the reporting person's tax liability by withholding shares in connection with the vesting of 9,315 RSUs on February 20, 2026, and calculated based on the closing price of the Company's common stock, as reported on the Nasdaq Stock Market, on February 20, 2026, of $0.5949.
F3 Reflects the vesting of 7,547 RSUs out of the 22,641 RSUs granted to the reporting person on February 22, 2024, into an equal number of shares of the Company's common stock, without the payment of any consideration, pursuant to the Company's 2021 Equity Incentive Plan.
F4 Represents the payment of the reporting person's tax liability by withholding shares in connection with the vesting of 7,547 RSUs on February 22, 2026, and calculated based on the closing price of the Company's common stock, as reported on the Nasdaq Stock Market, on February 20, 2026, of $0.5949 (as February 22, 2026 fell on a weekend).
F5 On February 20, 2025, the reporting person was granted 27,946 RSUs as a one-time bonus for services as an executive officer for the year ended December 31, 2024, and each RSU represents a right to receive one share of common stock or the cash equivalent thereof.
F6 The RSUs granted on February 20, 2025, vest in three equal installments that commenced on February 20, 2026.
F7 On February 22, 2024, the reporting person was granted 22,641 RSUs as a one-time bonus for services as an executive officer for the year ended December 31, 2023, and each RSU represents a right to receive one share of common stock or the cash equivalent thereof.
F8 The RSUs granted on February 22, 2024, vest in three equal installments that commenced on February 22, 2025.