TGEN
Tecogen Inc.
Electrical Equipment & Parts
Market Cap$120M
5Y Perf.+630.3%
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Stock Comparison
TGEN vs CDTX vs PESI vs AMTX vs CLNE
Revenue, margins, valuation, and 5-year total return — side by side.
CDTX
Cidara Therapeutics, Inc.
Biotechnology
Market Cap$6.96B
5Y Perf.+205.1%
PESI
Perma-Fix Environmental Services, Inc.
Waste Management
Market Cap$207M
5Y Perf.+99.8%
AMTX
Aemetis, Inc.
Oil & Gas Refining & Marketing
Market Cap$213M
5Y Perf.+290.0%
CLNE
Clean Energy Fuels Corp.
Oil & Gas Refining & Marketing
Market Cap$507M
5Y Perf.+10.5%
TGEN vs CDTX vs PESI vs AMTX vs CLNE — Key Financials
Market cap, revenue, margins, and valuation side-by-side.
| Company Snapshot | TGEN | CDTX | PESI | AMTX | CLNE |
|---|---|---|---|---|---|
| Industry | Electrical Equipment & Parts | Biotechnology | Waste Management | Oil & Gas Refining & Marketing | Oil & Gas Refining & Marketing |
| Market Cap | $120M | $6.96B | $207M | $213M | $507M |
| Revenue (TTM) | $27M | $0.00 | $59M | $209M | $439M |
| Net Income (TTM) | $-8M | $-185M | $-18M | $-74M | $-99M |
| Gross Margin | 36.3% | 100.0% | 4.1% | 3.4% | 11.7% |
| Operating Margin | -26.3% | -138.1% | -26.3% | -13.4% | 7.4% |
| Total Debt | $3M | $4M | $4M | $318M | $99M |
| Cash & Equiv. | $12M | $190M | $12M | $5M | $158M |
TGEN vs CDTX vs PESI vs AMTX vs CLNE — Long-Term Stock Performance
Price return indexed to 100 at period start. Dividends excluded.
TGEN
CDTX
PESI
AMTX
CLNE
| Stock | May 20 | May 26 | Return |
|---|---|---|---|
| Tecogen Inc. (TGEN) | 100 | 730.3 | +630.3% |
| Cidara Therapeutics… (CDTX) | 100 | 305.1 | +205.1% |
| Perma-Fix Environme… (PESI) | 100 | 199.8 | +99.8% |
| Aemetis, Inc. (AMTX) | 100 | 390.0 | +290.0% |
| Clean Energy Fuels … (CLNE) | 100 | 110.5 | +10.5% |
Price return only. Dividends and distributions are not included.
Quick Verdict: TGEN vs CDTX vs PESI vs AMTX vs CLNE
Each card shows where this stock fits in a portfolio — not just who wins on paper.
Bottom line: CDTX and CLNE are tied at the top with 2 categories each (5-stock set) — the right choice depends on your priorities. Clean Energy Fuels Corp. is the stronger pick specifically for profitability and margin quality and operational efficiency and capital deployment. TGEN also leads in specific categories worth noting. This set spans 3 sectors — these stocks serve different portfolio roles, not just different price points.
TGEN
Tecogen Inc.
The Growth Play
TGEN ranks third and is worth considering specifically for growth exposure.
- Rev growth 19.7%, EPS growth -57.9%, 3Y rev CAGR 2.7%
- 19.7% revenue growth vs CDTX's -94.5%
Best for: growth exposure
CDTX
Cidara Therapeutics, Inc.
The Income Pick
CDTX carries the broadest edge in this set and is the clearest fit for income & stability and sleep-well-at-night.
- beta 0.87
- Lower volatility, beta 0.87, Low D/E 2.2%, current ratio 4.25x
- Beta 0.87, current ratio 4.25x
- Beta 0.87 vs TGEN's 3.43, lower leverage
Best for: income & stability and sleep-well-at-night
PESI
Perma-Fix Environmental Services, Inc.
The Long-Run Compounder
PESI is the clearest fit if your priority is long-term compounding.
- 178.6% 10Y total return vs TGEN's -3.2%
Best for: long-term compounding
AMTX
Aemetis, Inc.
The Energy Pick
Among these 5 stocks, AMTX doesn't own a clear edge in any measured category.
Best for: energy exposure
CLNE
Clean Energy Fuels Corp.
The Quality Compounder
CLNE is the #2 pick in this set and the best alternative if quality and efficiency is your priority.
- -22.7% margin vs CDTX's -133.2%
- -9.2% ROA vs CDTX's -35.6%
Best for: quality and efficiency
See the full category breakdown
| Category | Winner | Why |
|---|---|---|
| Growth | TGEN | 19.7% revenue growth vs CDTX's -94.5% |
| Quality / Margins | CLNE | -22.7% margin vs CDTX's -133.2% |
| Stability / Safety | CDTX | Beta 0.87 vs TGEN's 3.43, lower leverage |
| Dividends | Tie | None of these 5 stocks pay a meaningful dividend |
| Momentum (1Y) | CDTX | +10.7% vs PESI's +26.2% |
| Efficiency (ROA) | CLNE | -9.2% ROA vs CDTX's -35.6% |
TGEN vs CDTX vs PESI vs AMTX vs CLNE — Revenue Breakdown by Segment
How each company's revenue is distributed across its business units
FY 2024
FY 2024
FY 2025
FY 2025
FY 2025
TGEN vs CDTX vs PESI vs AMTX vs CLNE — Financial Metrics
Side-by-side numbers across 5 stocks — who leads on profitability, valuation, growth, and risk.
BEST OVERALLCDTXLAGGINGAMTX
Who Leads Where
CLNE leads in 2 of 6 categories
CDTX leads 2 • TGEN leads 0 • PESI leads 0 • AMTX leads 0 • 1 tied
Explore the data ↓AMTXAemetis, Inc.
0leads
PESIPerma-Fix Environment…
0leads
TGENTecogen Inc.
0leads
CLNEClean Energy Fuels Co…
2leads
CDTXCidara Therapeutics, …
2leads
6 Total Categories
CATEGORYLEADERvs CLNEvs TGENMETRICS WON
Income & Cash FlowRevenue, margins, and cash flow strength
CLNE4/6
Valuation MetricsMultiples, price ratios, and targets
Tied
—
Profitability & EfficiencyROE, ROIC, leverage, and quality scores
CLNE5/9
Total Returns1Y, 3Y, 5Y total returns with dividends
CDTX4/6
Risk & VolatilityBeta, volatility, and downside exposure
CDTX2/2
Analyst OutlookRatings, price targets, and dividends
—
—
Income & Cash Flow (Last 12 Months)
CLNE leads this category, winning 4 of 6 comparable metrics.
Income & Cash Flow (Last 12 Months)
CLNE and CDTX operate at a comparable scale, with $439M and $0 in trailing revenue. CLNE is the more profitable business, keeping -22.7% of every revenue dollar as net income compared to CDTX's -133.2%. On growth, AMTX holds the edge at +27.4% YoY revenue growth, suggesting stronger near-term business momentum.
| Metric | TGENTecogen Inc. | CDTXCidara Therapeuti… | PESIPerma-Fix Environ… | AMTXAemetis, Inc. | CLNEClean Energy Fuel… |
|---|---|---|---|---|---|
| RevenueTrailing 12 months | $27M | $0 | $59M | $209M | $439M |
| EBITDAEarnings before interest/tax | -$6M | -$195M | -$14M | -$21M | $62M |
| Net IncomeAfter-tax profit | -$8M | -$185M | -$18M | -$74M | -$99M |
| Free Cash FlowCash after capex | -$10M | -$133M | -$14M | -$38M | $19M |
| Gross MarginGross profit ÷ Revenue | +36.3% | +100.0% | +4.1% | +3.4% | +11.7% |
| Operating MarginEBIT ÷ Revenue | -26.3% | -138.1% | -26.3% | -13.4% | +7.4% |
| Net MarginNet income ÷ Revenue | -30.5% | -133.2% | -30.1% | -35.4% | -22.7% |
| FCF MarginFCF ÷ Revenue | -38.1% | -138.6% | -23.4% | -18.2% | +4.3% |
| Rev. Growth (YoY)Latest quarter vs prior year | -12.5% | — | -20.1% | +27.4% | +13.3% |
| EPS Growth (YoY)Latest quarter vs prior year | -173.1% | -30.3% | -110.5% | +29.8% | +90.0% |
CLNE leads this category, winning 4 of 6 comparable metrics.
Valuation Metrics
Evenly matched — TGEN and AMTX and CLNE each lead in 1 of 3 comparable metrics.
Valuation Metrics
| Metric | TGENTecogen Inc. | CDTXCidara Therapeuti… | PESIPerma-Fix Environ… | AMTXAemetis, Inc. | CLNEClean Energy Fuel… |
|---|---|---|---|---|---|
| Market CapShares × price | $120M | $7.0B | $207M | $213M | $507M |
| Enterprise ValueMkt cap + debt − cash | $111M | $6.8B | $200M | $526M | $448M |
| Trailing P/EPrice ÷ TTM EPS | -16.07x | -8.28x | -14.89x | -2.44x | -2.29x |
| Forward P/EPrice ÷ next-FY EPS est. | — | — | — | — | — |
| PEG RatioP/E ÷ EPS growth rate | — | — | — | — | — |
| EV / EBITDAEnterprise value multiple | — | — | — | — | 94.64x |
| Price / SalesMarket cap ÷ Revenue | 4.44x | 5460.07x | 3.36x | 1.02x | 1.19x |
| Price / BookPrice ÷ Book value/share | 6.11x | 8.61x | 4.11x | — | 0.90x |
| Price / FCFMarket cap ÷ FCF | — | — | — | — | 8.47x |
Evenly matched — TGEN and AMTX and CLNE each lead in 1 of 3 comparable metrics.
Profitability & Efficiency
CLNE leads this category, winning 5 of 9 comparable metrics.
Profitability & Efficiency
CLNE delivers a -17.2% return on equity — every $100 of shareholder capital generates $-17 in annual profit, vs $-51 for TGEN. CDTX carries lower financial leverage with a 0.02x debt-to-equity ratio, signaling a more conservative balance sheet compared to CLNE's 0.18x. On the Piotroski fundamental quality scale (0–9), PESI scores 5/9 vs CDTX's 3/9, reflecting solid financial health.
| Metric | TGENTecogen Inc. | CDTXCidara Therapeuti… | PESIPerma-Fix Environ… | AMTXAemetis, Inc. | CLNEClean Energy Fuel… |
|---|---|---|---|---|---|
| ROE (TTM)Return on equity | -50.6% | -43.7% | -34.5% | — | -17.2% |
| ROA (TTM)Return on assets | -24.2% | -35.6% | -20.2% | -29.3% | -9.2% |
| ROICReturn on invested capital | -52.7% | — | -21.7% | -70.3% | -9.4% |
| ROCEReturn on capital employed | -34.0% | -2.1% | -16.7% | -19.0% | -9.4% |
| Piotroski ScoreFundamental quality 0–9 | 3 | 3 | 5 | 4 | 5 |
| Debt / EquityFinancial leverage | 0.13x | 0.02x | 0.09x | — | 0.18x |
| Net DebtTotal debt minus cash | -$10M | -$186M | -$7M | $313M | -$59M |
| Cash & Equiv.Liquid assets | $12M | $190M | $12M | $5M | $158M |
| Total DebtShort + long-term debt | $3M | $4M | $4M | $318M | $99M |
| Interest CoverageEBIT ÷ Interest expense | -46.61x | — | -42.14x | -0.27x | -1.07x |
CLNE leads this category, winning 5 of 9 comparable metrics.
Total Returns (Dividends Reinvested)
CDTX leads this category, winning 4 of 6 comparable metrics.
Total Returns (Dividends Reinvested)
A $10,000 investment in CDTX five years ago would be worth $55,070 today (with dividends reinvested), compared to $2,387 for AMTX. Over the past 12 months, CDTX leads with a +1066.4% total return vs PESI's +26.2%. The 3-year compound annual growth rate (CAGR) favors CDTX at 118.6% vs CLNE's -18.7% — a key indicator of consistent wealth creation.
| Metric | TGENTecogen Inc. | CDTXCidara Therapeuti… | PESIPerma-Fix Environ… | AMTXAemetis, Inc. | CLNEClean Energy Fuel… |
|---|---|---|---|---|---|
| YTD ReturnYear-to-date | -9.7% | +0.2% | -8.8% | +96.2% | +6.9% |
| 1-Year ReturnPast 12 months | +49.2% | +1066.4% | +26.2% | +140.0% | +44.4% |
| 3-Year ReturnCumulative with dividends | +460.5% | +944.2% | +21.7% | +37.4% | -46.3% |
| 5-Year ReturnCumulative with dividends | +180.2% | +450.7% | +45.6% | -76.1% | -73.8% |
| 10-Year ReturnCumulative with dividends | -3.2% | -16.0% | +178.6% | +31.1% | -26.9% |
| CAGR (3Y)Annualised 3-year return | +77.6% | +118.6% | +6.8% | +11.2% | -18.7% |
CDTX leads this category, winning 4 of 6 comparable metrics.
Risk & Volatility
CDTX leads this category, winning 2 of 2 comparable metrics.
Risk & Volatility
CDTX is the less volatile stock with a 0.87 beta — it tends to amplify market swings less than TGEN's 3.43 beta. A beta below 1.0 means the stock typically moves less than the S&P 500. CDTX currently trades 100.0% from its 52-week high vs TGEN's 39.9% drawdown — a narrower gap to the peak suggests stronger recent price momentum.
| Metric | TGENTecogen Inc. | CDTXCidara Therapeuti… | PESIPerma-Fix Environ… | AMTXAemetis, Inc. | CLNEClean Energy Fuel… |
|---|---|---|---|---|---|
| Beta (5Y)Sensitivity to S&P 500 | 3.43x | 0.87x | 1.85x | 1.46x | 1.19x |
| 52-Week HighHighest price in past year | $12.07 | $221.42 | $16.50 | $3.80 | $3.11 |
| 52-Week LowLowest price in past year | $1.94 | $18.51 | $8.02 | $1.22 | $1.56 |
| % of 52W HighCurrent price vs 52-week peak | +39.9% | +100.0% | +67.7% | +82.1% | +74.3% |
| RSI (14)Momentum oscillator 0–100 | 71.9 | 84.8 | 41.5 | 58.2 | 44.6 |
| Avg Volume (50D)Average daily shares traded | 486K | 0 | 164K | 1.8M | 1.3M |
CDTX leads this category, winning 2 of 2 comparable metrics.
Analyst Outlook
Insufficient data to determine a leader in this category.
Analyst Outlook
Analyst consensus: TGEN as "Buy", CDTX as "Buy", PESI as "Hold", AMTX as "Buy", CLNE as "Buy". Consensus price targets imply 211.2% upside for TGEN (target: $15) vs -43.9% for AMTX (target: $2).
| Metric | TGENTecogen Inc. | CDTXCidara Therapeuti… | PESIPerma-Fix Environ… | AMTXAemetis, Inc. | CLNEClean Energy Fuel… |
|---|---|---|---|---|---|
| Analyst RatingConsensus buy/hold/sell | Buy | Buy | Hold | Buy | Buy |
| Price TargetConsensus 12-month target | $15.00 | $221.50 | $18.00 | $1.75 | $3.50 |
| # AnalystsCovering analysts | 4 | 11 | 1 | 7 | 22 |
| Dividend YieldAnnual dividend ÷ price | — | — | — | — | — |
| Dividend StreakConsecutive years of raises | — | — | 1 | — | — |
| Dividend / ShareAnnual DPS | — | — | — | — | — |
| Buyback YieldShare repurchases ÷ mkt cap | 0.0% | 0.0% | 0.0% | 0.0% | +1.6% |
Insufficient data to determine a leader in this category.
Key Takeaway
CLNE leads in 2 of 6 categories (Income & Cash Flow, Profitability & Efficiency). CDTX leads in 2 (Total Returns, Risk & Volatility). 1 tied.
Best OverallCidara Therapeutics, Inc. (CDTX)Leads 2 of 6 categories
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TGEN vs CDTX vs PESI vs AMTX vs CLNE: Key Questions Answered
8 questions · data-driven answers · updated daily
01Is TGEN or CDTX or PESI or AMTX or CLNE a better buy right now?
For growth investors, Tecogen Inc.
(TGEN) is the stronger pick with 19. 7% revenue growth year-over-year, versus -94. 5% for Cidara Therapeutics, Inc. (CDTX). Analysts rate Tecogen Inc. (TGEN) a "Buy" — based on 4 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.
02Which is the better long-term investment — TGEN or CDTX or PESI or AMTX or CLNE?
Over the past 5 years, Cidara Therapeutics, Inc.
(CDTX) delivered a total return of +450. 7%, compared to -76. 1% for Aemetis, Inc. (AMTX). Over 10 years, the gap is even starker: PESI returned +178. 6% versus CLNE's -26. 9%. Past returns do not guarantee future results, and the stock with the higher historical return may already have its best growth priced in.
03Which is safer — TGEN or CDTX or PESI or AMTX or CLNE?
By beta (market sensitivity over 5 years), Cidara Therapeutics, Inc.
(CDTX) is the lower-risk stock at 0. 87β versus Tecogen Inc. 's 3. 43β — meaning TGEN is approximately 296% more volatile than CDTX relative to the S&P 500. On balance sheet safety, Cidara Therapeutics, Inc. (CDTX) carries a lower debt/equity ratio of 2% versus 18% for Clean Energy Fuels Corp. — giving it more financial flexibility in a downturn.
04Which is growing faster — TGEN or CDTX or PESI or AMTX or CLNE?
By revenue growth (latest reported year), Tecogen Inc.
(TGEN) is pulling ahead at 19. 7% versus -94. 5% for Cidara Therapeutics, Inc. (CDTX). On earnings-per-share growth, the picture is similar: Perma-Fix Environmental Services, Inc. grew EPS 43. 6% year-over-year, compared to -409. 5% for Cidara Therapeutics, Inc.. Over a 3-year CAGR, TGEN leads at 2. 7% 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.
05Which has better profit margins — TGEN or CDTX or PESI or AMTX or CLNE?
Perma-Fix Environmental Services, Inc.
(PESI) is the more profitable company, earning -22. 3% net margin versus -133. 2% for Cidara Therapeutics, Inc. — meaning it keeps -22. 3% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: AMTX leads at -17. 9% versus -138. 1% for CDTX. At the gross margin level — before operating expenses — CDTX leads at 100. 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.
06Which pays a better dividend — TGEN or CDTX or PESI or AMTX or CLNE?
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.
07Is TGEN or CDTX or PESI or AMTX or CLNE better for a retirement portfolio?
For long-horizon retirement investors, Cidara Therapeutics, Inc.
(CDTX) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (low volatility (β 0. 87)). Tecogen Inc. (TGEN) carries a higher beta of 3. 43 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (CDTX: -16. 0%, TGEN: -3. 2%), 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.
08What are the main differences between TGEN and CDTX and PESI and AMTX and CLNE?
These companies operate in different sectors (TGEN (Industrials) and CDTX (Healthcare) and PESI (Industrials) and AMTX (Energy) and CLNE (Energy)), which means they face different economic cycles, regulatory environments, and macro sensitivities — making direct comparison nuanced.
In terms of investment character: TGEN is a small-cap high-growth stock; CDTX is a small-cap quality compounder stock; PESI is a small-cap quality compounder stock; AMTX is a small-cap quality compounder 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.
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