ClearSign Technologies Corporation

CLIRNASDAQIndustrials● Active

$4.21

+$0.27(+6.85%)

Market Cap$26061626

P/E Ratio—

52W High$11.2

52W Low$3.24

Avg Volume35K

Open$3.93

Beta1.34

Free Cash Flow Financials Revenue

ClearSign Technologies Corporation (CLIR) Free Cash Flow & Analysis

Annual & trailing free cash flow, FCF margin, YoY change, valuation ratios, and peer context.

CLIR · free cash flow · updated Jun 8, 2026

Core FCF metrics

CLIR · FCF · TTM · margin & CAGR

Free cash flow was −$4.8M for FY2025 (fiscal year ending 2025-12-31), down 5.4% year-over-year The FCF margin was -92.4%.

FY2025 Free Cash Flow−$4.8M▼ -5.4% YoY

Trailing 12M (TTM)−$5.0Mtrailing 4 quarters sum

FCF Margin-92.4%−$4.8M ÷ revenue

3-Year CAGRN/AN/A — contains negative FCF

5-Year CAGRN/AN/A — contains negative FCF

FormulaFCF = Operating Cash Flow − Capital ExpendituresTTM = trailing 4 quarters sumCAGR → N/A if either endpoint ≤ 0

Source: FMP /cash-flow-statement · SEC 10-K / 10-Q · USDUpdated: Jun 8, 2026

Annual free cash flow history

FCF ($B, upper) · YoY Growth % (lower)

Positive FCFNegative FCF

Free Cash Flow

YoY Growth %

Annual free cash flow data

CLIR · free cash flow history · annual / quarterly

Fiscal YearOperating CFCapExFree Cash FlowYoY ChangeFCF Margin

FY2025Latest−$4.7M(0M)−$4.8M▼ 5.4%-92.4%

FY2024−$4.4M(0M)−$4.6M▼ 33.7%-127.7%

FY2023−$3.2M(0M)−$3.4M▲ +33.4%-142.9%

FY2022−$5.0M(0M)−$5.2M▲ +25.5%—

FY2021−$6.7M(0M)−$6.9M▼ 12.4%—

FCF = Operating Cash Flow − Capital Expenditures · CapEx shown as (negative) · Source: SEC filings via FMP

FCF valuation metrics

CLIR · P/FCF · FCF yield · FCF per share

ClearSign Technologies Corporation (CLIR) reported negative free cash flow of −$0.00B. FCF-based valuation ratios are not meaningful when FCF is negative.

FCF Yield (TTM)

N/A

Free Cash Flow ÷ Market Cap

per FMP freeCashFlowYieldTTM definition

FCF per Share (TTM)

N/A

TTM FCF ÷ Shares Outstanding

Price / FCF

N/A

Share Price ÷ FCF per Share

EV / FCF (TTM)

N/A

Enterprise Value basis

FCF-based valuation ratios are only meaningful when free cash flow is positive. Negative FCF indicates capital expenditures exceeded operating cash flow.

Source: FMP /key-metrics-ttm · /cash-flow-statement Q · /income-statementFY2025 · 2025-12-31

Cash flow statement summary

CLIR · cash flow statement · operating / investing / financing

For FY2025, ClearSign Technologies Corporation generated −$4.7M in operating cash flow and spent 0M in capital expenditures, yielding −$4.8M in free cash flow.

Operating Activities

−$4.7M

Cash from core business operations

2025-12-31

Investing Activities

−$0.1M

CapEx, acquisitions & investments

2025-12-31

Financing Activities

−$0.0M

Buybacks, dividends & debt

2025-12-31

FCF FormulaOperating CF (−$4.7M) − |CapEx| (0M) = FCF (−$4.8M)

For the complete Operating / Investing / Financing line-item breakdown:

View Full Cash Flow Statement →

Free cash flow vs peers (Industrials)

CLIR vs peers · FCF

#CompanyFree Cash FlowYoYFCF MarginRelative

ClearSign Technologies CorporationYOU

CLIR

−$4.8M-5.4%-92.4%

Loss

Space Exploration Technologies Corp.

SPCX

−$13.95B-159.0%-74.7%

Loss

Industrials · Sorted by FCF · FMP /cash-flow-statementFull FCF Rankings →

About Free Cash Flow & Methodology

ClearSign Technologies Corporation (CLIR) reported free cash flow of −$4.8M for FY2025 (fiscal year ending 2025-12-31), down 5.4% year-over-year. The FCF margin was -92.4%.

ClearSign Technologies Corporation has reported negative free cash flow in recent periods, indicating capital expenditures have exceeded operating cash flow. Data available for 15 fiscal years.

Data sourced from FMP /cash-flow-statement · SEC 10-K / 10-Q · USD.

Q&A and summaries align with SEC 10-K/10-Q cash flow disclosures and FMP /cash-flow-statement where noted.

Revenue Financial statements Net income Earnings Forecast Price history Market cap Cash on hand P/E ratio

Frequently asked questions

CLIR free cash flow · 8 questions

ClearSign Technologies Corporation free cash flow was −$4.8M for FY2025, down 5.4% year-over-year. On a trailing twelve-month (TTM) basis, free cash flow stands at −$5.0M.

CLIR free cash flowCLIR FCFCLIR FCF 2025CLIR free cash flow TTM

▸ Source: FMP /cash-flow-statement · US GAAP · ClearSign Technologies Corporation · ClearSign Technologies Corporation SEC 10-K & 10-Q filings · US GAAP · Last updated: Jun 8, 2026