# ClearSign Technologies Corp: overview CLIR · Nasdaq · CIK 1434524 · [Technology](/sectors/technology.md) · fiscal year ends Dec 31 Pages: [Overview](/companies/clir.md) · [Financials](/companies/clir/financials.md) · [Filings](/companies/clir/filings.md) · [Insiders](/companies/clir/insiders.md) Latest reported revenue: [$560.0k](/filings/0001104659-26-096539.md) for Q2 FY2026, three months to 2026-06-30, from the 10-Q filed Aug 14, 2026 (XBRL us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax, accession 0001104659-26-096539). ## Last eight quarters | Line item | Unit | Q3 FY2024 (2024-09-30) | Q4 FY2024 (2024-12-31) | Q1 FY2025 (2025-03-31) | Q2 FY2025 (2025-06-30) | Q3 FY2025 (2025-09-30) | Q4 FY2025 (2025-12-31) | Q1 FY2026 (2026-03-31) | Q2 FY2026 (2026-06-30) | | --- | --- | ---: | ---: | ---: | ---: | ---: | ---: | ---: | ---: | | Revenue | $k | [1,859](/filings/0001104659-26-037699.md) | [590](/filings/0001104659-26-037699.md) | [401](/filings/0001104659-26-061940.md) | [133](/filings/0001104659-26-096539.md) | [1,029](/filings/0001104659-26-037699.md) | [3,671](/filings/0001104659-26-037699.md) | [191](/filings/0001104659-26-061940.md) | [560](/filings/0001104659-26-096539.md) | | Gross margin | % | [29.6%](/filings/0001104659-26-037699.md) | [14.9%](/filings/0001104659-26-037699.md) | [48.9%](/filings/0001104659-26-061940.md) | [41.4%](/filings/0001104659-26-096539.md) | [35.8%](/filings/0001104659-26-037699.md) | [21.9%](/filings/0001104659-26-037699.md) | [(205.8%)](/filings/0001104659-26-061940.md) | [40.7%](/filings/0001104659-26-096539.md) | | Operating margin | % | [(77.1%)](/filings/0001104659-25-112472.md) | [(282.4%) d](/filings/0001104659-26-037699.md) | [(562.8%)](/filings/0001104659-26-061940.md) | [(1382.0%)](/filings/0001104659-26-096539.md) | [(170.1%)](/filings/0001104659-25-112472.md) | [(22.5%) d](/filings/0001104659-26-037699.md) | [(1193.2%)](/filings/0001104659-26-061940.md) | [(267.5%)](/filings/0001104659-26-096539.md) | | Net margin | % | [(62.1%)](/filings/0001104659-26-037699.md) | [(197.3%)](/filings/0001104659-26-037699.md) | [(517.7%)](/filings/0001104659-26-061940.md) | [(1263.2%)](/filings/0001104659-26-096539.md) | [(138.9%)](/filings/0001104659-26-037699.md) | [(8.5%)](/filings/0001104659-26-037699.md) | [(1146.6%)](/filings/0001104659-26-061940.md) | [(233.4%)](/filings/0001104659-26-096539.md) | | Diluted EPS | $ per share | [(0.20)](/filings/0001104659-26-037699.md) | [(0.25)](/filings/0001104659-26-037699.md) | [(0.38)](/filings/0001104659-26-061940.md) | [(0.30)](/filings/0001104659-26-096539.md) | [(0.26)](/filings/0001104659-26-037699.md) | [(0.06)](/filings/0001104659-26-037699.md) | [(0.39)](/filings/0001104659-26-061940.md) | [(0.22)](/filings/0001104659-26-096539.md) | | Free cash flow | $k | [(1,433) d](/filings/0001104659-25-112472.md) | [(436) d](/filings/0001104659-26-037699.md) | [(1,115)](/filings/0001104659-26-061940.md) | [(511) d](/filings/0001104659-26-096539.md) | [(1,831) d](/filings/0001104659-25-112472.md) | [(1,283) d](/filings/0001104659-26-037699.md) | not reported | not reported | - Revenue. XBRL Revenue: us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax. - Gross margin (gross profit / revenue). XBRL Gross profit: us-gaap:GrossProfit; Revenue: us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax. - Operating margin (operating income / revenue). XBRL Operating income: us-gaap:OperatingIncomeLoss; Revenue: us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax. Derived values: 12-month figure less the 9-month figure. - Net margin (net income / revenue). XBRL Net income: us-gaap:NetIncomeLoss; Revenue: us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax. - Diluted EPS. XBRL Diluted EPS: us-gaap:EarningsPerShareDiluted. - Free cash flow (operating cash flow − capital expenditure). XBRL Operating cash flow: us-gaap:NetCashProvidedByUsedInOperatingActivities; Capital expenditure: us-gaap:PaymentsToAcquirePropertyPlantAndEquipment. Derived values: 9-month figure less the 6-month figure; 12-month figure less the 9-month figure; 6-month figure less the 3-month figure. ## Last five fiscal years | Line item | Unit | FY2021 (2021-12-31) | FY2022 (2022-12-31) | FY2023 (2023-12-31) | FY2024 (2024-12-31) | FY2025 (2025-12-31) | | --- | --- | ---: | ---: | ---: | ---: | ---: | | Revenue | $k | [607](/filings/0001558370-23-005285.md) | [374](/filings/0001558370-24-004441.md) | [2,403](/filings/0001558370-25-004155.md) | [3,596](/filings/0001104659-26-037699.md) | [5,234](/filings/0001104659-26-037699.md) | | Gross margin | % | [(74.5%)](/filings/0001558370-23-005285.md) | [31.0%](/filings/0001558370-24-004441.md) | [34.0%](/filings/0001558370-25-004155.md) | [31.1%](/filings/0001104659-26-037699.md) | [27.2%](/filings/0001104659-26-037699.md) | | Operating margin | % | [(1341.8%)](/filings/0001558370-23-005285.md) | [(1635.6%)](/filings/0001558370-24-004441.md) | [(248.9%)](/filings/0001558370-25-004155.md) | [(180.4%)](/filings/0001104659-26-037699.md) | [(127.5%)](/filings/0001104659-26-037699.md) | | Net margin | % | [(1300.0%)](/filings/0001558370-23-005285.md) | [(1539.6%)](/filings/0001558370-24-004441.md) | [(216.1%)](/filings/0001558370-25-004155.md) | [(147.4%)](/filings/0001104659-26-037699.md) | [(105.0%)](/filings/0001104659-26-037699.md) | | Diluted EPS | $ per share | [(0.25)](/filings/0001558370-23-005285.md) | [(0.16)](/filings/0001558370-24-004441.md) | [(0.13)](/filings/0001558370-25-004155.md) | [(1.08)](/filings/0001104659-26-037699.md) | [(0.99)](/filings/0001104659-26-037699.md) | | Free cash flow | $k | [(6,780)](/filings/0001558370-23-005285.md) | [(5,002)](/filings/0001558370-24-004441.md) | not reported | [(4,412)](/filings/0001104659-26-037699.md) | [(4,740)](/filings/0001104659-26-037699.md) | - Revenue. XBRL Revenue: us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax. - Gross margin (gross profit / revenue). XBRL Gross profit: us-gaap:GrossProfit; Revenue: us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax. - Operating margin (operating income / revenue). XBRL Operating income: us-gaap:OperatingIncomeLoss; Revenue: us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax. - Net margin (net income / revenue). XBRL Net income: us-gaap:NetIncomeLoss; Revenue: us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax. - Diluted EPS. XBRL Diluted EPS: us-gaap:EarningsPerShareDiluted. - Free cash flow (operating cash flow − capital expenditure). XBRL Operating cash flow: us-gaap:NetCashProvidedByUsedInOperatingActivities; Capital expenditure: us-gaap:PaymentsToAcquirePropertyPlantAndEquipment. Each value links to the filing it came from. d marks a derived value. A ratio is not reported when any input is missing. ## Insider purchases and sales The last 20 open-market transactions on Form 4 (codes P and S). Reported price is as stated on the form, not a market price. [All insider transactions](/companies/clir/insiders.md) None in coverage. ## Funds that report holding it From each manager’s latest Form 13F, largest reported value first. Reported value is as filed: filing data, not a price. [All funds](/funds.md) | Fund | Quarter ended | Reported value | Shares | Put or call | Change on the quarter before | | --- | --- | ---: | ---: | --- | --- | | [VANGUARD CAPITAL MANAGEMENT LLC](/funds/2100119.md) | 2026-06-30 | $386.9k | 105,429 | | Unchanged | | [SIMON QUICK ADVISORS, LLC](/funds/1692038.md) | 2026-06-30 | $221.4k | 60,314 | | Unchanged | | [GEODE CAPITAL MANAGEMENT, LLC](/funds/1214717.md) | 2026-06-30 | $188.9k | 51,457 | | Reduced −6,226 | | [Beacon Pointe Advisors, LLC](/funds/1744317.md) | 2026-06-30 | $99.7k | 27,173 | | Unchanged | | [VANGUARD FIDUCIARY TRUST CO](/funds/933478.md) | 2026-06-30 | $86.1k | 23,460 | | Unchanged | | [HighTower Advisors, LLC](/funds/1462245.md) | 2026-06-30 | $83.2k | 22,662 | | Added +9,982 | | [CITADEL ADVISORS LLC](/funds/1423053.md) | 2026-06-30 | $75.5k | 20,565 | | New +20,565 | | [BlackRock, Inc.](/funds/2012383.md) | 2026-06-30 | $71.6k | 19,503 | | Unchanged | | [DDD Partners, LLC](/funds/1729673.md) | 2026-06-30 | $44.0k | 12,000 | | Unchanged | | [NORTHERN TRUST CORP](/funds/73124.md) | 2026-06-30 | $37.0k | 10,080 | | New +10,080 | ## Recent filings [All 793 filings](/companies/clir/filings.md) | Filed | Accepted | Form | What it is | Accession | | --- | --- | --- | --- | --- | | 2026-09-14 | 12:45 ET | [8-K](/filings/0001104659-26-107294.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001104659-26-107294 | | 2026-08-20 | 20:15 ET | [8-K](/filings/0001104659-26-099235.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001104659-26-099235 | | 2026-08-14 | 13:00 ET | [10-Q](/filings/0001104659-26-096539.md) | Quarterly report, period 2026-06-30 | 0001104659-26-096539 | | 2026-08-11 | 11:45 ET | [8-K](/filings/0001104659-26-093758.md) | 5.02 Departure or appointment of officers or directors; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001104659-26-093758 | | 2026-07-23 | 12:45 ET | [8-K](/filings/0001104659-26-086099.md) | 1.01 Entry into a material agreement; 3.02 Unregistered sale of equity; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001104659-26-086099 | | 2026-07-06 | 20:06 ET | [8-K](/filings/0001104659-26-080744.md) | 8.01 Other events; 9.01 Financial statements and exhibits | 0001104659-26-080744 | | 2026-06-18 | 20:15 ET | [8-K](/filings/0001104659-26-075734.md) | 8.01 Other events; 9.01 Financial statements and exhibits | 0001104659-26-075734 | | 2026-06-09 | 20:30 ET | [8-K](/filings/0001104659-26-071865.md) | 5.07 Shareholder vote results; 9.01 Financial statements and exhibits | 0001104659-26-071865 | | 2026-06-01 | 12:30 ET | [8-K](/filings/0001104659-26-068614.md) | 1.01 Entry into a material agreement; 8.01 Other events; 9.01 Financial statements and exhibits | 0001104659-26-068614 | | 2026-05-28 | 20:19 ET | [8-K](/filings/0001104659-26-067517.md) | 8.01 Other events; 9.01 Financial statements and exhibits | 0001104659-26-067517 | ## Latest annual report [Form 10-K for the fiscal year ended Dec 31, 2025](/filings/0001104659-26-037699.md), filed Mar 31, 2026. ## Forecast league Q3 FY2026, the quarter ended 2026-09-30, is open for forecasts until the first results filing for it is accepted by EDGAR. Results are due by \[object Promise\]. [Forecast this quarter](/leagues/2026q3/targets/0b363345-9661-48f0-aa96-d83352d10a03) ## About the filer - CIK: 1434524 - Tickers: CLIR - Exchange: Nasdaq - SIC code: 3823 Industrial Instruments For Measurement, Display, and Control - State of incorporation: DE - Filer category: Non-accelerated filer
Smaller reporting company Source: SEC EDGAR, XBRL company facts, the filing index and Forms 4. Last ingested by Listed: Oct 24, 2026, 15:39 ET. No prices; not investment advice.