Welcome to our dedicated page for ClearSign Technologies SEC filings (Ticker: CLIR), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
ClearSign Technologies Corporation filings document the public-company record for an industrial combustion and sensing technology developer. Recent Form 8-K reports cover financial results, Regulation FD disclosures, conference-call materials, Nasdaq listing compliance, and capital-structure actions involving the company’s common stock.
Proxy materials disclose stockholder voting matters, charter amendment proposals, board and governance information, executive compensation, equity-award data and meeting procedures. The filing record also documents matters tied to the company’s Delaware corporate structure, common stock rights, reverse stock split approvals, and formal updates that connect operating results with ClearSign Core™, ClearSign Eye™ and related combustion-system commercialization.
ClearSign Technologies Corporation reported record results for 2025, with full-year revenue of $5.2 million, up 44% from 2024, and fourth quarter revenue of $3.7 million. Growth was driven mainly by a 26-burner process heater order for a petrochemical plant on the Texas Gulf Coast, alongside contributions from midstream burners, flares, spare parts, and engineering services.
Gross margin for 2025 was 27%, down from 31% the prior year, primarily due to higher warranty accruals. Net loss increased by about $197,000, largely reflecting $746,000 in non-recurring legal fees. Operating cash outflow was $4.7 million, and the company ended 2025 with $9.2 million in cash and approximately 5.3 million common shares outstanding.
Management highlighted growing demand for its ultra-low NOx burner technology, including 36- and 32-burner retrofit orders for major refiners, expanding flare system projects that can approach $1 million per order, and a proposal pipeline of roughly 225 process burners. ClearSign targets breakeven at around $16 million in annual revenue, or about 160 process burners per year, leveraging an asset-light model and manufacturing partnerships such as Zeeco.
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 Corporation describes its business and risks in an annual report, focusing on its ClearSign Core™ combustion technology and ClearSign Eye sensing products for industrial burners, boilers, process heaters and flares. The company emphasizes an asset-light model, partnering with OEMs like Zeeco and California Boiler to manufacture and distribute low-NOx burners and flare systems that aim to cut emissions and improve efficiency versus legacy solutions.
As of June 30, 2025, non‑affiliate equity market value was $27,596,237, and as of March 16, 2026, there were 5,408,723 common shares outstanding, adjusted for a 1‑for‑10 reverse stock split effective March 16, 2026. ClearSign reports an accumulated deficit of about $104.5 million, continues to fund operations largely via equity sales and government grants, and highlights heavy revenue concentration in a few refinery and engineering customers alongside extensive regulatory and market‑adoption risks.
ClearSign Technologies Corporation announced that it has regained compliance with Nasdaq’s minimum bid price requirement for continued listing on the Nasdaq Capital Market. Nasdaq confirmed that the company’s common stock closed at or above $1.00 per share for at least ten consecutive business days, satisfying Nasdaq Listing Rule 5550(a)(2). Nasdaq stated that the compliance matter is now closed, meaning ClearSign’s shares remain listed on the Nasdaq Capital Market.
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 Corporation is implementing a 1-for-10 reverse stock split of its common stock, effective at 12:01 a.m. Eastern Time on March 16, 2026. This will reduce outstanding shares from approximately 54.1 million to approximately 5.41 million, with no change to authorized shares or par value.
The reverse split is intended to increase the share price to regain compliance with Nasdaq’s $1.00 minimum bid price requirement. Each 10 pre-split shares will be combined into one share, while voting and other rights remain proportionate. No fractional shares will be issued; positions will be rounded up to the next whole share at the Depository Trust Company participant level.
ClearSign Technologies Corporation held a special stockholder meeting where investors approved an amendment to its certificate of incorporation to allow a reverse stock split of its common stock at a ratio between 1-for-2 and 1-for-10, to be implemented at the board’s discretion for the purpose of complying with Nasdaq listing rules and with the option for the board to abandon the amendment. The proposal passed with 26,667,027 votes for, 9,224,242 against, and 77,216 abstentions, with no broker non-votes. Stockholders also approved the option to adjourn the special meeting if needed, with 27,887,899 votes for, 7,865,883 against, and 214,703 abstentions. The board set the 2026 annual meeting of stockholders for June 8, 2026, with an April 13, 2026 record date, and established March 14, 2026 as the deadline for stockholder proposals and director nominations for inclusion or consideration under SEC Rule 14a-8 and the company’s bylaws.
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.