OPTT
Ocean Power Technologies, Inc.
Electrical Equipment & Parts
Market Cap$69M
5Y Perf.-16.1%
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Stock Comparison
OPTT vs AMRC vs PESI vs ERII
Revenue, margins, valuation, and 5-year total return — side by side.
AMRC
Ameresco, Inc.
Engineering & Construction
Market Cap$1.57B
5Y Perf.+38.3%
PESI
Perma-Fix Environmental Services, Inc.
Waste Management
Market Cap$207M
5Y Perf.+99.8%
ERII
Energy Recovery, Inc.
Industrial - Pollution & Treatment Controls
Market Cap$498M
5Y Perf.+22.7%
OPTT vs AMRC vs PESI vs ERII — Key Financials
Market cap, revenue, margins, and valuation side-by-side.
| Company Snapshot | OPTT | AMRC | PESI | ERII |
|---|---|---|---|---|
| Industry | Electrical Equipment & Parts | Engineering & Construction | Waste Management | Industrial - Pollution & Treatment Controls |
| Market Cap | $69M | $1.57B | $207M | $498M |
| Revenue (TTM) | $3M | $1.98B | $59M | $127M |
| Net Income (TTM) | $-36M | $31M | $-18M | $33M |
| Gross Margin | -56.4% | 15.6% | 4.1% | 64.5% |
| Operating Margin | -9.8% | 6.3% | -26.3% | 24.1% |
| Forward P/E | — | 25.0x | — | 22.9x |
| Total Debt | $2M | $1.95B | $4M | $9M |
| Cash & Equiv. | $7M | $72M | $12M | $48M |
OPTT vs AMRC vs PESI vs ERII — Long-Term Stock Performance
Price return indexed to 100 at period start. Dividends excluded.
OPTT
AMRC
PESI
ERII
| Stock | May 20 | May 26 | Return |
|---|---|---|---|
| Ocean Power Technol… (OPTT) | 100 | 83.9 | -16.1% |
| Ameresco, Inc. (AMRC) | 100 | 138.3 | +38.3% |
| Perma-Fix Environme… (PESI) | 100 | 199.8 | +99.8% |
| Energy Recovery, In… (ERII) | 100 | 122.7 | +22.7% |
Price return only. Dividends and distributions are not included.
Quick Verdict: OPTT vs AMRC vs PESI vs ERII
Each card shows where this stock fits in a portfolio — not just who wins on paper.
Bottom line: ERII leads in 4 of 7 categories, making it the strongest pick for valuation and capital efficiency and profitability and margin quality. Ameresco, Inc. is the stronger pick specifically for growth and revenue expansion and recent price momentum and sentiment. As sector peers, any of these can serve as alternatives in the same allocation.
OPTT
Ocean Power Technologies, Inc.
The Growth Play
OPTT is the clearest fit if your priority is growth exposure.
- Rev growth 6.1%, EPS growth 63.8%, 3Y rev CAGR 49.4%
Best for: growth exposure
AMRC
Ameresco, Inc.
The Long-Run Compounder
AMRC is the #2 pick in this set and the best alternative if long-term compounding is your priority.
- 5.4% 10Y total return vs PESI's 178.6%
- 9.2% revenue growth vs ERII's -7.1%
- +134.3% vs ERII's -37.3%
Best for: long-term compounding
PESI
Perma-Fix Environmental Services, Inc.
The Secondary Option
PESI lags the leaders in this set but could rank higher in a more targeted comparison.
Best for: industrials exposure
ERII
Energy Recovery, Inc.
The Income Pick
ERII carries the broadest edge in this set and is the clearest fit for income & stability and sleep-well-at-night.
- beta 1.53
- Lower volatility, beta 1.53, Low D/E 4.6%, current ratio 10.44x
- Beta 1.53, current ratio 10.44x
- Better valuation composite
Best for: income & stability and sleep-well-at-night
See the full category breakdown
| Category | Winner | Why |
|---|---|---|
| Growth | AMRC | 9.2% revenue growth vs ERII's -7.1% |
| Value | ERII | Better valuation composite |
| Quality / Margins | ERII | 25.9% margin vs OPTT's -10.5% |
| Stability / Safety | ERII | Beta 1.53 vs OPTT's 2.99, lower leverage |
| Dividends | Tie | None of these 4 stocks pay a meaningful dividend |
| Momentum (1Y) | AMRC | +134.3% vs ERII's -37.3% |
| Efficiency (ROA) | ERII | 15.2% ROA vs OPTT's -97.4%, ROIC 10.3% vs -80.3% |
OPTT vs AMRC vs PESI vs ERII — Revenue Breakdown by Segment
How each company's revenue is distributed across its business units
FY 2025
FY 2024
FY 2025
FY 2025
OPTT vs AMRC vs PESI vs ERII — Financial Metrics
Side-by-side numbers across 4 stocks — who leads on profitability, valuation, growth, and risk.
BEST OVERALLERIILAGGINGOPTT
Who Leads Where
ERII leads in 2 of 6 categories
AMRC leads 1 • PESI leads 1 • OPTT leads 0 • 1 tied
Explore the data ↓OPTTOcean Power Technolog…
0leads
PESIPerma-Fix Environment…
1leads
AMRCAmeresco, Inc.
1leads
ERIIEnergy Recovery, Inc.
2leads
6 Total Categories
CATEGORYLEADERvs AMRCvs PESIMETRICS WON
Income & Cash FlowRevenue, margins, and cash flow strength
ERII5/6
Valuation MetricsMultiples, price ratios, and targets
AMRC3/5
Profitability & EfficiencyROE, ROIC, leverage, and quality scores
ERII7/9
Total Returns1Y, 3Y, 5Y total returns with dividends
PESI3/6
Risk & VolatilityBeta, volatility, and downside exposure
Tied
—
Analyst OutlookRatings, price targets, and dividends
—
—
Income & Cash Flow (Last 12 Months)
ERII leads this category, winning 5 of 6 comparable metrics.
Income & Cash Flow (Last 12 Months)
AMRC is the larger business by revenue, generating $2.0B annually — 576.5x OPTT's $3M. ERII is the more profitable business, keeping 25.9% of every revenue dollar as net income compared to OPTT's -10.5%. On growth, AMRC holds the edge at +13.8% YoY revenue growth, suggesting stronger near-term business momentum.
| Metric | OPTTOcean Power Techn… | AMRCAmeresco, Inc. | PESIPerma-Fix Environ… | ERIIEnergy Recovery, … |
|---|---|---|---|---|
| RevenueTrailing 12 months | $3M | $2.0B | $59M | $127M |
| EBITDAEarnings before interest/tax | -$33M | $204M | -$14M | $41M |
| Net IncomeAfter-tax profit | -$36M | $31M | -$18M | $33M |
| Free Cash FlowCash after capex | -$26M | -$251M | -$14M | $27M |
| Gross MarginGross profit ÷ Revenue | -56.4% | +15.6% | +4.1% | +64.5% |
| Operating MarginEBIT ÷ Revenue | -9.8% | +6.3% | -26.3% | +24.1% |
| Net MarginNet income ÷ Revenue | -10.5% | +1.6% | -30.1% | +25.9% |
| FCF MarginFCF ÷ Revenue | -7.5% | -12.7% | -23.4% | +21.4% |
| Rev. Growth (YoY)Latest quarter vs prior year | -37.8% | +13.8% | -20.1% | -97.5% |
| EPS Growth (YoY)Latest quarter vs prior year | -27.7% | -2.5% | -110.5% | +100.0% |
ERII leads this category, winning 5 of 6 comparable metrics.
Valuation Metrics
AMRC leads this category, winning 3 of 5 comparable metrics.
Valuation Metrics
At 22.5x trailing earnings, ERII trades at a 37% valuation discount to AMRC's 35.8x P/E. On an enterprise value basis, AMRC's 15.0x EV/EBITDA is more attractive than ERII's 16.2x.
| Metric | OPTTOcean Power Techn… | AMRCAmeresco, Inc. | PESIPerma-Fix Environ… | ERIIEnergy Recovery, … |
|---|---|---|---|---|
| Market CapShares × price | $69M | $1.6B | $207M | $498M |
| Enterprise ValueMkt cap + debt − cash | $64M | $3.4B | $200M | $460M |
| Trailing P/EPrice ÷ TTM EPS | -2.07x | 35.76x | -14.89x | 22.45x |
| Forward P/EPrice ÷ next-FY EPS est. | — | 25.04x | — | 22.91x |
| PEG RatioP/E ÷ EPS growth rate | — | — | — | — |
| EV / EBITDAEnterprise value multiple | — | 15.00x | — | 16.23x |
| Price / SalesMarket cap ÷ Revenue | 11.70x | 0.81x | 3.36x | 3.70x |
| Price / BookPrice ÷ Book value/share | 1.68x | 1.41x | 4.11x | 2.48x |
| Price / FCFMarket cap ÷ FCF | — | — | — | 28.57x |
AMRC leads this category, winning 3 of 5 comparable metrics.
Profitability & Efficiency
ERII leads this category, winning 7 of 9 comparable metrics.
Profitability & Efficiency
ERII delivers a 17.4% return on equity — every $100 of shareholder capital generates $17 in annual profit, vs $-154 for OPTT. ERII carries lower financial leverage with a 0.05x debt-to-equity ratio, signaling a more conservative balance sheet compared to AMRC's 1.73x. On the Piotroski fundamental quality scale (0–9), ERII scores 6/9 vs OPTT's 3/9, reflecting solid financial health.
| Metric | OPTTOcean Power Techn… | AMRCAmeresco, Inc. | PESIPerma-Fix Environ… | ERIIEnergy Recovery, … |
|---|---|---|---|---|
| ROE (TTM)Return on equity | -154.5% | +2.9% | -34.5% | +17.4% |
| ROA (TTM)Return on assets | -97.4% | +0.7% | -20.2% | +15.2% |
| ROICReturn on invested capital | -80.3% | +3.3% | -21.7% | +10.3% |
| ROCEReturn on capital employed | -88.8% | +3.7% | -16.7% | +11.3% |
| Piotroski ScoreFundamental quality 0–9 | 3 | 4 | 5 | 6 |
| Debt / EquityFinancial leverage | 0.07x | 1.73x | 0.09x | 0.05x |
| Net DebtTotal debt minus cash | -$5M | $1.9B | -$7M | -$39M |
| Cash & Equiv.Liquid assets | $7M | $72M | $12M | $48M |
| Total DebtShort + long-term debt | $2M | $1.9B | $4M | $9M |
| Interest CoverageEBIT ÷ Interest expense | -21.11x | 1.20x | -42.14x | — |
ERII leads this category, winning 7 of 9 comparable metrics.
Total Returns (Dividends Reinvested)
PESI leads this category, winning 3 of 6 comparable metrics.
Total Returns (Dividends Reinvested)
A $10,000 investment in PESI five years ago would be worth $14,563 today (with dividends reinvested), compared to $1,536 for OPTT. Over the past 12 months, AMRC leads with a +134.3% total return vs ERII's -37.3%. The 3-year compound annual growth rate (CAGR) favors PESI at 6.8% vs ERII's -26.3% — a key indicator of consistent wealth creation.
| Metric | OPTTOcean Power Techn… | AMRCAmeresco, Inc. | PESIPerma-Fix Environ… | ERIIEnergy Recovery, … |
|---|---|---|---|---|
| YTD ReturnYear-to-date | +9.9% | -3.2% | -8.8% | -31.3% |
| 1-Year ReturnPast 12 months | -25.8% | +134.3% | +26.2% | -37.3% |
| 3-Year ReturnCumulative with dividends | -31.6% | -29.9% | +21.7% | -60.0% |
| 5-Year ReturnCumulative with dividends | -84.6% | -44.0% | +45.6% | -54.3% |
| 10-Year ReturnCumulative with dividends | -98.8% | +542.4% | +178.6% | -11.9% |
| CAGR (3Y)Annualised 3-year return | -11.9% | -11.2% | +6.8% | -26.3% |
PESI leads this category, winning 3 of 6 comparable metrics.
Risk & Volatility
Evenly matched — PESI and ERII each lead in 1 of 2 comparable metrics.
Risk & Volatility
ERII is the less volatile stock with a 1.53 beta — it tends to amplify market swings less than OPTT's 2.99 beta. A beta below 1.0 means the stock typically moves less than the S&P 500. PESI currently trades 67.7% from its 52-week high vs OPTT's 39.1% drawdown — a narrower gap to the peak suggests stronger recent price momentum.
| Metric | OPTTOcean Power Techn… | AMRCAmeresco, Inc. | PESIPerma-Fix Environ… | ERIIEnergy Recovery, … |
|---|---|---|---|---|
| Beta (5Y)Sensitivity to S&P 500 | 2.99x | 2.03x | 1.85x | 1.53x |
| 52-Week HighHighest price in past year | $0.90 | $44.93 | $16.50 | $18.32 |
| 52-Week LowLowest price in past year | $0.29 | $12.37 | $8.02 | $9.30 |
| % of 52W HighCurrent price vs 52-week peak | +39.1% | +66.1% | +67.7% | +51.5% |
| RSI (14)Momentum oscillator 0–100 | 46.7 | 68.0 | 41.5 | 60.6 |
| Avg Volume (50D)Average daily shares traded | 5.0M | 507K | 164K | 996K |
Evenly matched — PESI and ERII each lead in 1 of 2 comparable metrics.
Analyst Outlook
Insufficient data to determine a leader in this category.
Analyst Outlook
Analyst consensus: AMRC as "Buy", PESI as "Hold", ERII as "Buy". Consensus price targets imply 61.1% upside for PESI (target: $18) vs 37.9% for ERII (target: $13).
| Metric | OPTTOcean Power Techn… | AMRCAmeresco, Inc. | PESIPerma-Fix Environ… | ERIIEnergy Recovery, … |
|---|---|---|---|---|
| Analyst RatingConsensus buy/hold/sell | — | Buy | Hold | Buy |
| Price TargetConsensus 12-month target | — | $43.17 | $18.00 | $13.00 |
| # AnalystsCovering analysts | — | 23 | 1 | 16 |
| Dividend YieldAnnual dividend ÷ price | — | — | — | — |
| Dividend StreakConsecutive years of raises | — | — | 1 | — |
| Dividend / ShareAnnual DPS | — | — | — | — |
| Buyback YieldShare repurchases ÷ mkt cap | 0.0% | 0.0% | 0.0% | +7.2% |
Insufficient data to determine a leader in this category.
Key Takeaway
ERII leads in 2 of 6 categories (Income & Cash Flow, Profitability & Efficiency). AMRC leads in 1 (Valuation Metrics). 1 tied.
Best OverallEnergy Recovery, Inc. (ERII)Leads 2 of 6 categories
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OPTT vs AMRC vs PESI vs ERII: Key Questions Answered
10 questions · data-driven answers · updated daily
01Is OPTT or AMRC or PESI or ERII a better buy right now?
For growth investors, Ameresco, Inc.
(AMRC) is the stronger pick with 9. 2% revenue growth year-over-year, versus -7. 1% for Energy Recovery, Inc. (ERII). Energy Recovery, Inc. (ERII) offers the better valuation at 22. 5x trailing P/E (22. 9x forward), making it the more compelling value choice. Analysts rate Ameresco, Inc. (AMRC) a "Buy" — based on 23 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 has the better valuation — OPTT or AMRC or PESI or ERII?
On trailing P/E, Energy Recovery, Inc.
(ERII) is the cheapest at 22. 5x versus Ameresco, Inc. at 35. 8x. On forward P/E, Energy Recovery, Inc. is actually cheaper at 22. 9x.
03Which is the better long-term investment — OPTT or AMRC or PESI or ERII?
Over the past 5 years, Perma-Fix Environmental Services, Inc.
(PESI) delivered a total return of +45. 6%, compared to -84. 6% for Ocean Power Technologies, Inc. (OPTT). Over 10 years, the gap is even starker: AMRC returned +542. 4% versus OPTT's -98. 8%. Past returns do not guarantee future results, and the stock with the higher historical return may already have its best growth priced in.
04Which is safer — OPTT or AMRC or PESI or ERII?
By beta (market sensitivity over 5 years), Energy Recovery, Inc.
(ERII) is the lower-risk stock at 1. 53β versus Ocean Power Technologies, Inc. 's 2. 99β — meaning OPTT is approximately 96% more volatile than ERII relative to the S&P 500. On balance sheet safety, Energy Recovery, Inc. (ERII) carries a lower debt/equity ratio of 5% versus 173% for Ameresco, Inc. — giving it more financial flexibility in a downturn.
05Which is growing faster — OPTT or AMRC or PESI or ERII?
By revenue growth (latest reported year), Ameresco, Inc.
(AMRC) is pulling ahead at 9. 2% versus -7. 1% for Energy Recovery, Inc. (ERII). On earnings-per-share growth, the picture is similar: Ocean Power Technologies, Inc. grew EPS 63. 8% year-over-year, compared to -22. 4% for Ameresco, Inc.. Over a 3-year CAGR, OPTT leads at 49. 4% 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.
06Which has better profit margins — OPTT or AMRC or PESI or ERII?
Energy Recovery, Inc.
(ERII) is the more profitable company, earning 17. 0% net margin versus -367. 0% for Ocean Power Technologies, Inc. — meaning it keeps 17. 0% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: ERII leads at 18. 2% versus -370. 0% for OPTT. At the gross margin level — before operating expenses — ERII leads at 65. 2%, 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.
07Is OPTT or AMRC or PESI or ERII more undervalued right now?
On forward earnings alone, Energy Recovery, Inc.
(ERII) trades at 22. 9x forward P/E versus 25. 0x for Ameresco, Inc. — 2. 1x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for PESI: 61. 1% to $18. 00.
08Which pays a better dividend — OPTT or AMRC or PESI or ERII?
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.
09Is OPTT or AMRC or PESI or ERII better for a retirement portfolio?
For long-horizon retirement investors, Energy Recovery, Inc.
(ERII) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding. Ocean Power Technologies, Inc. (OPTT) carries a higher beta of 2. 99 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (ERII: -11. 9%, OPTT: -98. 8%), 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.
10What are the main differences between OPTT and AMRC and PESI and ERII?
Both stocks operate in the Industrials sector, making this a peer-level intra-sector comparison — the same macro tailwinds and headwinds will affect both.
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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