CLIR vs CLNE

For growth investors, ClearSign Technologies Corporation (CLIR) is the stronger pick with 49.

6% revenue growth year-over-year, versus 2. 2% for Clean Energy Fuels Corp. (CLNE). Analysts rate ClearSign Technologies Corporation (CLIR) a "Buy" — based on 1 analyst ratings — the highest consensus in this comparison. The "better buy" depends entirely on your goals: growth investors should weight revenue trajectory, value investors should weight P/E and PEG, and income investors should weight dividend yield and streak.

Over the past 5 years, Clean Energy Fuels Corp.

(CLNE) delivered a total return of -73. 8%, compared to -89. 1% for ClearSign Technologies Corporation (CLIR). Over 10 years, the gap is even starker: CLNE returned -26. 9% versus CLIR's -88. 7%. Past returns do not guarantee future results, and the stock with the higher historical return may already have its best growth priced in.

By beta (market sensitivity over 5 years), Clean Energy Fuels Corp.

(CLNE) is the lower-risk stock at 1. 19β versus ClearSign Technologies Corporation's 1. 43β — meaning CLIR is approximately 20% more volatile than CLNE relative to the S&P 500. On balance sheet safety, ClearSign Technologies Corporation (CLIR) carries a lower debt/equity ratio of 1% versus 18% for Clean Energy Fuels Corp. — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), ClearSign Technologies Corporation (CLIR) is pulling ahead at 49.

6% versus 2. 2% for Clean Energy Fuels Corp. (CLNE). On earnings-per-share growth, the picture is similar: ClearSign Technologies Corporation grew EPS 15. 4% year-over-year, compared to -173. 0% for Clean Energy Fuels Corp.. Over a 3-year CAGR, CLIR leads at 80. 9% annualised revenue growth. Higher growth typically commands a higher valuation multiple — check whether the premium P/E or P/S is justified by the growth rate using the PEG ratio.

Clean Energy Fuels Corp.

(CLNE) is the more profitable company, earning -52. 3% net margin versus -147. 4% for ClearSign Technologies Corporation — meaning it keeps -52. 3% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: CLNE leads at -22. 1% versus -180. 4% for CLIR. At the gross margin level — before operating expenses — CLIR leads at 31. 1%, reflecting greater pricing power or product mix advantage. Stronger margins indicate durable pricing power, lower cost of revenue, or higher mix of software/services. They are one of the clearest signs of business quality.

None of the stocks in this comparison currently pay a material dividend.

All are effectively zero-yield and should be held for capital appreciation rather than income.

For long-horizon retirement investors, Clean Energy Fuels Corp.

(CLNE) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (low volatility (β 1. 19)). Both have compounded well over 10 years (CLNE: -26. 9%, CLIR: -88. 7%), confirming both are viable long-term holds — but the lower-volatility option typically results in less emotional selling during corrections. Retirement portfolios generally favour predictability over maximum returns. Consult a financial advisor before making allocation decisions.

These companies operate in different sectors (CLIR (Industrials) and CLNE (Energy)), which means they face different economic cycles, regulatory environments, and macro sensitivities — making direct comparison nuanced.

In terms of investment character: CLIR is a small-cap high-growth stock; CLNE is a small-cap quality compounder stock. These fundamental differences mean investors should not choose between them on a single metric — the "better stock" depends entirely on which of these characteristics aligns with your investment strategy.