Every Form 4 that ClearSign Technologies Corporation (CLIR) has filed with the SEC in the last 12 months is listed below, newest first, and each one links through to the document itself with the summary and the scores our analysis gives it.
A Form 4 covers the transactions officers, directors and large holders report, so if you follow CLIR and want that one kind of document rather than the whole filing history, this is the page to keep. The company's other filings, of every form, are on the full CLIR filings page.
ClearSign Technologies Corp director Lou Basenese received a grant of 3,766 non-statutory stock options on September 30, 2026, as compensation for director services during the quarter ended September 30, 2026. Granted under the Amended and Restated 2021 Equity Incentive Plan and the non-employee director compensation policy, the options were immediately vested and exercisable, carry a $3.55 per-share exercise price, and expire September 29, 2036. His reported option holdings following the grant were 3,766 options.
ClearSign Technologies Corp director Gil Todd Silva acquired 4,225 restricted stock units and 3,766 non-statutory stock options on September 30, 2026, as compensation for services as a non-employee director.
Each RSU represents a right to receive one share of common stock or its cash equivalent and vests upon the first of a Change in Control, disability, death, or separation from service. The options were immediately vested and exercisable at $3.55 per share and expire September 29, 2036. The reported post-transaction amounts were 23,801 RSUs and 3,766 options.
ClearSign Technologies Corp (CLIR) director Larry Michael Saddler received a compensation-related grant of 2,275 non-statutory stock options on September 30, 2026. The options cover 2,275 shares of common stock and were immediately vested and exercisable on the grant date. They have a $3.55 exercise price and expire September 29, 2036. The award was pro-rated based on his appointment date of August 6, 2026; his reported directly held option position after the grant was 2,275 options.
ClearSign Technologies Corp director Anthony Digiandomenico received 3,766 non-statutory stock options on September 30, 2026, as compensation for director services during the quarter ended September 30, 2026. The options were immediately vested and exercisable on the grant date, have a $3.55 exercise price per common share, and expire September 29, 2036.
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.
ClearSign Technologies Corp director Lou Basenese received a grant of stock options as part of his quarterly board compensation. On the grant date, he was awarded non-statutory options to purchase 4,595 shares of common stock at an exercise price of $3.67 per share.
The options were granted under ClearSign’s Amended and Restated 2021 Equity Incentive Plan pursuant to the company’s non-employee director compensation policy and became fully vested and exercisable immediately. Following this grant, Basenese holds 4,595 non-statutory stock options directly.
Silva Gil Todd reported acquisition or exercise transactions in this Form 4 filing.
ClearSign Technologies director Gil Todd Silva received new equity awards as compensation for service as a non-employee director for the quarter ended June 30, 2026. The awards include 4,595 non-statutory stock options to buy common shares at $3.67 per share, expiring on June 29, 2036, which were fully vested and exercisable on the grant date.
Silva was also granted 4,087 restricted stock units, each representing one share of common stock or its cash equivalent. These RSUs will vest upon the first to occur of a change in control, disability, death, or separation from service. Following these grants, Silva holds 4,595 options and 19,576 RSUs directly.
ClearSign Technologies director Anthony Digiandomenico received a grant of stock options as compensation. On the grant date, he was awarded non-statutory stock options covering 4,595 shares of ClearSign common stock under the Amended and Restated 2021 Equity Incentive Plan.
The options have an exercise price of $3.67 per share, expire on June 29, 2036, and were fully vested and exercisable immediately. Following this grant, his directly held derivative position reported in this filing consists of 4,595 non-statutory stock options linked to ClearSign common stock.
ClearSign Technologies Corp Chief Executive Officer Colin James Deller amended a prior insider report to correct details of a stock bonus. On February 26, 2026, he received 7,001 shares of common stock as a one-time bonus grant, valued at $5.616 per share after a 1-for-10 reverse split.
To cover taxes, 3,501 shares were disposed of through tax withholding, a non-market transaction, leaving Deller with 34,967 common shares held directly. The amendment updates the originally reported grant size, tax-withheld amount, and resulting beneficial ownership tied to 2025 executive services.
ClearSign Technologies Corp director Gil Todd Silva bought additional shares of the company in the open market. On April 23, 2026, the reporting person made two separate open-market purchases of 1,000 shares each of ClearSign common stock, at prices of $5.319 and $5.25 per share, increasing their direct investment in the company.
ClearSign Technologies director Lou Basenese received a grant of stock options as board compensation. He was awarded non-statutory options to purchase 3,024 shares of common stock at an exercise price of $4.36 per share for service as a non-employee director for the quarter ended March 31, 2026.
The options were granted under the ClearSign Technologies Corporation 2021 Equity Incentive Plan pursuant to the company’s non-employee director compensation policy. They vested and became exercisable immediately on the March 31, 2026 grant date and expire on March 31, 2036. No open-market share purchases or sales were reported.
ClearSign Technologies Corp director Silva Gil Todd received new equity compensation awards for board service. For the quarter ended March 31, 2026, the director was granted 3,440 restricted stock units and non‑statutory stock options for 3,024 shares of common stock.
The RSUs each represent one share of common stock or its cash equivalent and vest upon the earliest of a change in control, disability, death, or separation from service. The stock options were immediately vested and exercisable on the grant date, have a $4.36 exercise price, and expire on March 31, 2036. Following these awards, the director directly owns 123,909 shares of common stock.
ClearSign Technologies Corp director Anthony Digiandomenico received a grant of 3,024 non-statutory stock options as compensation for serving as a non-employee director for the quarter ended March 31, 2026. The options have an exercise price of $4.36 per share, are immediately vested and exercisable, and expire on March 31, 2036.
ClearSign Technologies director Gil Todd Silva reported open-market purchases of the company’s common stock. He bought 2,000 shares on March 16, 2026 at $4.355 per share and another 2,000 shares on March 17, 2026 at $4.20 per share, bringing his direct holdings to 4,000 shares.
ClearSign Technologies Corp CEO Colin James Deller reported a stock-based compensation grant and related tax withholding. He received 210,043 shares of common stock on February 26, 2026 as a one-time bonus for services as an executive officer for the year ended December 31, 2025, with the number of shares based on the closing price of $0.5616 per share. To cover his tax liability on this award, 105,022 shares were withheld at the same closing price, recorded as a tax-withholding disposition rather than an open-market sale. Following these transactions, Deller directly owned 276,874 common shares.
ClearSign Technologies Corp Chief Financial Officer Brent Hinds reported equity compensation awards and related tax withholding. On February 26, 2026, he was granted 56,645 shares of common stock as a one-time bonus for services in 2025, valued using the closing price of $0.5616 per share. He also received 47,009 restricted stock units, each representing one share of common stock or its cash equivalent. To cover tax liabilities from the stock issuance, 20,761 common shares were withheld at the same $0.5616 price, leaving him with 170,824 common shares held directly after these transactions.
ClearSign Technologies Corp’s Chief Financial Officer Brent Hinds reported equity compensation activity involving restricted stock units (RSUs) and related tax withholding. On February 20, 2026, 9,315 RSUs from a 27,946-unit grant awarded on February 20, 2025 vested into the same number of common shares without cash payment under the 2021 Equity Incentive Plan, with 3,413 shares withheld to cover tax liabilities at a price of $0.5949 per share.
On February 22, 2026, 7,547 RSUs from a 22,641-unit grant dated February 22, 2024 likewise vested into common shares with no consideration, and 2,765 shares were withheld to pay taxes, also based on a $0.5949 closing price. Following these transactions, Hinds directly held 134,940 shares of ClearSign common stock.
ClearSign Technologies Corp. Chief Financial Officer Brent Hinds reported routine equity compensation activity. On February 2, 2026, 10,127 restricted stock units (RSUs) granted on February 2, 2023 vested into the same number of shares of common stock at no cost under the 2021 Equity Incentive Plan.
To cover tax obligations from this vesting, 3,711 shares of common stock were withheld at a price of $0.5991 per share, based on the Nasdaq closing price that day. After these transactions, Hinds directly owned 124,256 shares of ClearSign common stock. The original 30,380 RSUs vest in three equal annual installments that began on February 2, 2024.