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Stock Comparison

OPAL vs REX vs GPRE vs CLNE

Revenue, margins, valuation, and 5-year total return — side by side.

Live fundamentals10-year financials5-year price chart
OPAL
OPAL Fuels Inc.

Regulated Gas

UtilitiesNASDAQ • US
Market Cap$54M
5Y Perf.-76.0%
REX
REX American Resources Corporation

Chemicals - Specialty

Basic MaterialsNYSE • US
Market Cap$1.60B
5Y Perf.+204.3%
GPRE
Green Plains Inc.

Chemicals - Specialty

Basic MaterialsNASDAQ • US
Market Cap$1.15B
5Y Perf.-48.4%
CLNE
Clean Energy Fuels Corp.

Oil & Gas Refining & Marketing

EnergyNASDAQ • US
Market Cap$507M
5Y Perf.-70.8%

OPAL vs REX vs GPRE vs CLNE — Key Financials

Market cap, revenue, margins, and valuation side-by-side.

Company Snapshot
OPAL logoOPAL
REX logoREX
GPRE logoGPRE
CLNE logoCLNE
IndustryRegulated GasChemicals - SpecialtyChemicals - SpecialtyOil & Gas Refining & Marketing
Market Cap$54M$1.60B$1.15B$507M
Revenue (TTM)$349M$651M$1.94B$439M
Net Income (TTM)$15M$50M$-15M$-99M
Gross Margin28.1%12.7%1.8%11.7%
Operating Margin1.4%8.6%1.2%7.4%
Forward P/E15.6x62.8x46.6x
Total Debt$365M$21M$508M$99M
Cash & Equiv.$24M$196M$182M$158M

OPAL vs REX vs GPRE vs CLNELong-Term Stock Performance

Price return indexed to 100 at period start. Dividends excluded.

OPAL
REX
GPRE
CLNE
StockMay 21May 26Return
OPAL Fuels Inc. (OPAL)10024.0-76.0%
REX American Resour… (REX)100304.3+204.3%
Green Plains Inc. (GPRE)10051.6-48.4%
Clean Energy Fuels … (CLNE)10029.2-70.8%

Price return only. Dividends and distributions are not included.

Quick Verdict: OPAL vs REX vs GPRE vs CLNE

Each card shows where this stock fits in a portfolio — not just who wins on paper.

Bottom line: OPAL and REX are tied at the top with 3 categories each — the right choice depends on your priorities. REX American Resources Corporation is the stronger pick specifically for profitability and margin quality and capital preservation and lower volatility. GPRE also leads in specific categories worth noting. This set spans 3 sectors — these stocks serve different portfolio roles, not just different price points.
OPAL
OPAL Fuels Inc.
The Income Pick

OPAL carries the broadest edge in this set and is the clearest fit for income & stability and growth exposure.

  • Dividend streak 0 yrs, beta 1.58, yield 15.3%
  • Rev growth 16.3%, EPS growth 6.4%, 3Y rev CAGR 14.0%
  • 16.3% revenue growth vs REX's -22.9%
  • Lower P/E (15.6x vs 46.6x)
Best for: income & stability and growth exposure
REX
REX American Resources Corporation
The Long-Run Compounder

REX is the #2 pick in this set and the best alternative if long-term compounding and sleep-well-at-night is your priority.

  • 464.7% 10Y total return vs GPRE's 21.3%
  • Lower volatility, beta 0.36, Low D/E 3.3%, current ratio 8.64x
  • Beta 0.36, current ratio 8.64x
  • 7.7% margin vs CLNE's -22.7%
Best for: long-term compounding and sleep-well-at-night
GPRE
Green Plains Inc.
The Momentum Pick

GPRE is the clearest fit if your priority is momentum.

  • +336.6% vs OPAL's -0.4%
Best for: momentum
CLNE
Clean Energy Fuels Corp.
The Secondary Option

CLNE lags the leaders in this set but could rank higher in a more targeted comparison.

Best for: energy exposure
See the full category breakdown
CategoryWinnerWhy
GrowthOPAL logoOPAL16.3% revenue growth vs REX's -22.9%
ValueOPAL logoOPALLower P/E (15.6x vs 46.6x)
Quality / MarginsREX logoREX7.7% margin vs CLNE's -22.7%
Stability / SafetyREX logoREXBeta 0.36 vs OPAL's 1.58, lower leverage
DividendsOPAL logoOPAL15.3% yield; the other 3 pay no meaningful dividend
Momentum (1Y)GPRE logoGPRE+336.6% vs OPAL's -0.4%
Efficiency (ROA)REX logoREX6.7% ROA vs CLNE's -9.2%, ROIC 11.4% vs -9.4%

OPAL vs REX vs GPRE vs CLNE — Revenue Breakdown by Segment

How each company's revenue is distributed across its business units

OPALOPAL Fuels Inc.
FY 2024
Environmental Credits
86.8%$176M
Service
10.8%$22M
Parts
1.9%$4M
Product and Service, Other
0.6%$1M
REXREX American Resources Corporation
FY 2024
Other Member
100.0%$329,000
GPREGreen Plains Inc.
FY 2025
Products And Services Other
101.2%$94M
Intersegment Revenues
-1.2%$-1,119,000
CLNEClean Energy Fuels Corp.
FY 2025
Product
77.0%$365M
Service
12.5%$59M
Station construction sales
7.2%$34M
LCFS Credits
2.7%$13M
Other services
0.6%$3M
Federal Alternative Fuels Tax Credit
0.0%$198,000

OPAL vs REX vs GPRE vs CLNE — Financial Metrics

Side-by-side numbers across 4 stocks — who leads on profitability, valuation, growth, and risk.

BEST OVERALLREXLAGGINGCLNE

Income & Cash Flow (Last 12 Months)

OPAL leads this category, winning 3 of 6 comparable metrics.

GPRE is the larger business by revenue, generating $1.9B annually — 5.5x OPAL's $349M. REX is the more profitable business, keeping 7.7% of every revenue dollar as net income compared to CLNE's -22.7%. On growth, OPAL holds the edge at +24.7% YoY revenue growth, suggesting stronger near-term business momentum.

MetricOPAL logoOPALOPAL Fuels Inc.REX logoREXREX American Reso…GPRE logoGPREGreen Plains Inc.CLNE logoCLNEClean Energy Fuel…
RevenueTrailing 12 months$349M$651M$1.9B$439M
EBITDAEarnings before interest/tax$28M$67M$122M$62M
Net IncomeAfter-tax profit$15M$50M-$15M-$99M
Free Cash FlowCash after capex-$34M$18M$90M$19M
Gross MarginGross profit ÷ Revenue+28.1%+12.7%+1.8%+11.7%
Operating MarginEBIT ÷ Revenue+1.4%+8.6%+1.2%+7.4%
Net MarginNet income ÷ Revenue+4.2%+7.7%-0.8%-22.7%
FCF MarginFCF ÷ Revenue-9.8%+2.7%+4.7%+4.3%
Rev. Growth (YoY)Latest quarter vs prior year+24.7%+0.4%-25.9%+13.3%
EPS Growth (YoY)Latest quarter vs prior year+2.7%+2.9%+134.2%+90.0%
OPAL leads this category, winning 3 of 6 comparable metrics.

Valuation Metrics

OPAL leads this category, winning 3 of 6 comparable metrics.

At 15.6x trailing earnings, OPAL trades at a 47% valuation discount to REX's 29.5x P/E. On an enterprise value basis, OPAL's 14.0x EV/EBITDA is more attractive than GPRE's 103.8x.

MetricOPAL logoOPALOPAL Fuels Inc.REX logoREXREX American Reso…GPRE logoGPREGreen Plains Inc.CLNE logoCLNEClean Energy Fuel…
Market CapShares × price$54M$1.6B$1.1B$507M
Enterprise ValueMkt cap + debt − cash$395M$1.4B$1.5B$448M
Trailing P/EPrice ÷ TTM EPS15.60x29.50x-9.14x-2.29x
Forward P/EPrice ÷ next-FY EPS est.62.81x46.62x
PEG RatioP/E ÷ EPS growth rate0.55x
EV / EBITDAEnterprise value multiple14.03x16.60x103.82x94.64x
Price / SalesMarket cap ÷ Revenue0.15x2.50x0.55x1.19x
Price / BookPrice ÷ Book value/share0.14x2.67x1.44x0.90x
Price / FCFMarket cap ÷ FCF17.84x8.47x
OPAL leads this category, winning 3 of 6 comparable metrics.

Profitability & Efficiency

REX leads this category, winning 8 of 9 comparable metrics.

REX delivers a 7.7% return on equity — every $100 of shareholder capital generates $8 in annual profit, vs $-17 for CLNE. REX carries lower financial leverage with a 0.03x debt-to-equity ratio, signaling a more conservative balance sheet compared to OPAL's 0.73x. On the Piotroski fundamental quality scale (0–9), OPAL scores 5/9 vs GPRE's 4/9, reflecting solid financial health.

MetricOPAL logoOPALOPAL Fuels Inc.REX logoREXREX American Reso…GPRE logoGPREGreen Plains Inc.CLNE logoCLNEClean Energy Fuel…
ROE (TTM)Return on equity+3.1%+7.7%-2.0%-17.2%
ROA (TTM)Return on assets+1.6%+6.7%-1.0%-9.2%
ROICReturn on invested capital+0.5%+11.4%-5.2%-9.4%
ROCEReturn on capital employed+0.6%+10.1%-6.2%-9.4%
Piotroski ScoreFundamental quality 0–95545
Debt / EquityFinancial leverage0.73x0.03x0.66x0.18x
Net DebtTotal debt minus cash$341M-$175M$326M-$59M
Cash & Equiv.Liquid assets$24M$196M$182M$158M
Total DebtShort + long-term debt$365M$21M$508M$99M
Interest CoverageEBIT ÷ Interest expense0.18x-0.08x-1.07x
REX leads this category, winning 8 of 9 comparable metrics.

Total Returns (Dividends Reinvested)

REX leads this category, winning 4 of 6 comparable metrics.

A $10,000 investment in REX five years ago would be worth $34,996 today (with dividends reinvested), compared to $2,388 for OPAL. Over the past 12 months, GPRE leads with a +336.6% total return vs OPAL's -0.4%. The 3-year compound annual growth rate (CAGR) favors REX at 50.8% vs OPAL's -29.2% — a key indicator of consistent wealth creation.

MetricOPAL logoOPALOPAL Fuels Inc.REX logoREXREX American Reso…GPRE logoGPREGreen Plains Inc.CLNE logoCLNEClean Energy Fuel…
YTD ReturnYear-to-date-1.7%+50.2%+60.1%+6.9%
1-Year ReturnPast 12 months-0.4%+147.6%+336.6%+44.4%
3-Year ReturnCumulative with dividends-64.5%+243.1%-46.8%-46.3%
5-Year ReturnCumulative with dividends-76.1%+250.0%-48.5%-73.8%
10-Year ReturnCumulative with dividends-76.1%+464.7%+21.3%-26.9%
CAGR (3Y)Annualised 3-year return-29.2%+50.8%-19.0%-18.7%
REX leads this category, winning 4 of 6 comparable metrics.

Risk & Volatility

REX leads this category, winning 2 of 2 comparable metrics.

REX is the less volatile stock with a 0.36 beta — it tends to amplify market swings less than OPAL's 1.58 beta. A beta below 1.0 means the stock typically moves less than the S&P 500. REX currently trades 91.2% from its 52-week high vs OPAL's 57.4% drawdown — a narrower gap to the peak suggests stronger recent price momentum.

MetricOPAL logoOPALOPAL Fuels Inc.REX logoREXREX American Reso…GPRE logoGPREGreen Plains Inc.CLNE logoCLNEClean Energy Fuel…
Beta (5Y)Sensitivity to S&P 5001.58x0.36x1.22x1.19x
52-Week HighHighest price in past year$4.08$53.36$18.94$3.11
52-Week LowLowest price in past year$1.65$19.44$3.39$1.56
% of 52W HighCurrent price vs 52-week peak+57.4%+91.2%+86.9%+74.3%
RSI (14)Momentum oscillator 0–10048.059.154.344.6
Avg Volume (50D)Average daily shares traded198K204K1.5M1.3M
REX leads this category, winning 2 of 2 comparable metrics.

Analyst Outlook

Insufficient data to determine a leader in this category.

Analyst consensus: REX as "Buy", GPRE as "Buy", CLNE as "Buy". Consensus price targets imply 51.5% upside for CLNE (target: $4) vs -16.2% for GPRE (target: $14). OPAL is the only dividend payer here at 15.29% yield — a key consideration for income-focused portfolios.

MetricOPAL logoOPALOPAL Fuels Inc.REX logoREXREX American Reso…GPRE logoGPREGreen Plains Inc.CLNE logoCLNEClean Energy Fuel…
Analyst RatingConsensus buy/hold/sellBuyBuyBuy
Price TargetConsensus 12-month target$60.00$13.80$3.50
# AnalystsCovering analysts32022
Dividend YieldAnnual dividend ÷ price+15.3%
Dividend StreakConsecutive years of raises00
Dividend / ShareAnnual DPS$0.36
Buyback YieldShare repurchases ÷ mkt cap0.0%+0.9%+2.6%+1.6%
Insufficient data to determine a leader in this category.
Key Takeaway

REX leads in 3 of 6 categories (Profitability & Efficiency, Total Returns). OPAL leads in 2 (Income & Cash Flow, Valuation Metrics).

Best OverallREX American Resources Corp… (REX)Leads 3 of 6 categories
Loading custom metrics...

OPAL vs REX vs GPRE vs CLNE: Key Questions Answered

10 questions · data-driven answers · updated daily

01

Is OPAL or REX or GPRE or CLNE a better buy right now?

For growth investors, OPAL Fuels Inc.

(OPAL) is the stronger pick with 16. 3% revenue growth year-over-year, versus -22. 9% for REX American Resources Corporation (REX). OPAL Fuels Inc. (OPAL) offers the better valuation at 15. 6x trailing P/E, making it the more compelling value choice. Analysts rate REX American Resources Corporation (REX) a "Buy" — based on 3 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.

02

Which has the better valuation — OPAL or REX or GPRE or CLNE?

On trailing P/E, OPAL Fuels Inc.

(OPAL) is the cheapest at 15. 6x versus REX American Resources Corporation at 29. 5x. On forward P/E, Green Plains Inc. is actually cheaper at 46. 6x — notably different from the trailing picture, reflecting expected earnings growth.

03

Which is the better long-term investment — OPAL or REX or GPRE or CLNE?

Over the past 5 years, REX American Resources Corporation (REX) delivered a total return of +250.

0%, compared to -76. 1% for OPAL Fuels Inc. (OPAL). Over 10 years, the gap is even starker: REX returned +464. 7% versus OPAL's -76. 1%. Past returns do not guarantee future results, and the stock with the higher historical return may already have its best growth priced in.

04

Which is safer — OPAL or REX or GPRE or CLNE?

By beta (market sensitivity over 5 years), REX American Resources Corporation (REX) is the lower-risk stock at 0.

36β versus OPAL Fuels Inc. 's 1. 58β — meaning OPAL is approximately 334% more volatile than REX relative to the S&P 500. On balance sheet safety, REX American Resources Corporation (REX) carries a lower debt/equity ratio of 3% versus 73% for OPAL Fuels Inc. — giving it more financial flexibility in a downturn.

05

Which is growing faster — OPAL or REX or GPRE or CLNE?

By revenue growth (latest reported year), OPAL Fuels Inc.

(OPAL) is pulling ahead at 16. 3% versus -22. 9% for REX American Resources Corporation (REX). On earnings-per-share growth, the picture is similar: OPAL Fuels Inc. grew EPS 638. 9% year-over-year, compared to -173. 0% for Clean Energy Fuels Corp.. Over a 3-year CAGR, OPAL leads at 14. 0% 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.

06

Which has better profit margins — OPAL or REX or GPRE or CLNE?

REX American Resources Corporation (REX) is the more profitable company, earning 9.

1% net margin versus -52. 3% for Clean Energy Fuels Corp. — meaning it keeps 9. 1% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: REX leads at 10. 0% versus -22. 1% for CLNE. At the gross margin level — before operating expenses — OPAL leads at 24. 0%, 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.

07

Is OPAL or REX or GPRE or CLNE more undervalued right now?

On forward earnings alone, Green Plains Inc.

(GPRE) trades at 46. 6x forward P/E versus 62. 8x for REX American Resources Corporation — 16. 2x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for CLNE: 51. 5% to $3. 50.

08

Which pays a better dividend — OPAL or REX or GPRE or CLNE?

In this comparison, OPAL (15.

3% yield) pays a dividend. REX, GPRE, CLNE do not pay a meaningful dividend and should not be held primarily for income.

09

Is OPAL or REX or GPRE or CLNE better for a retirement portfolio?

For long-horizon retirement investors, REX American Resources Corporation (REX) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (low volatility (β 0.

36), +464. 7% 10Y return). Both have compounded well over 10 years (REX: +464. 7%, CLNE: -26. 9%), 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.

10

What are the main differences between OPAL and REX and GPRE and CLNE?

These companies operate in different sectors (OPAL (Utilities) and REX (Basic Materials) and GPRE (Basic Materials) and CLNE (Energy)), which means they face different economic cycles, regulatory environments, and macro sensitivities — making direct comparison nuanced.

In terms of investment character: OPAL is a small-cap high-growth stock; REX is a small-cap quality compounder stock; GPRE is a small-cap quality compounder stock; CLNE is a small-cap quality compounder stock. OPAL pays a dividend while REX, GPRE, CLNE do not, making them suitable for different income and tax situations. 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.

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Quality Business

  • Sector: Basic Materials
  • Market Cap > $100B
  • Net Margin > 5%
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  • Market Cap > $100B
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Quality Business

  • Sector: Energy
  • Market Cap > $100B
  • Revenue Growth > 6%
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Beat Both

Find stocks that outperform OPAL and REX and GPRE and CLNE on the metrics below

Revenue Growth>
%
(OPAL: 24.7% · REX: 0.4%)
Net Margin>
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(OPAL: 4.2% · REX: 7.7%)
P/E Ratio<
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(OPAL: 15.6x · REX: 29.5x)

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