SCWO vs PESI

For growth investors, Perma-Fix Environmental Services, Inc.

(PESI) is the stronger pick with 4. 3% revenue growth year-over-year, versus -40. 1% for 374Water, Inc. (SCWO). Analysts rate Perma-Fix Environmental Services, Inc. (PESI) a "Hold" — 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, 374Water, Inc.

(SCWO) delivered a total return of +195. 0%, compared to +62. 7% for Perma-Fix Environmental Services, Inc. (PESI). Over 10 years, the gap is even starker: SCWO returned +1715% versus PESI's +200. 4%. 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), Perma-Fix Environmental Services, Inc.

(PESI) is the lower-risk stock at 1. 85β versus 374Water, Inc. 's 2. 58β — meaning SCWO is approximately 40% more volatile than PESI relative to the S&P 500. On balance sheet safety, 374Water, Inc. (SCWO) carries a lower debt/equity ratio of 4% versus 9% for Perma-Fix Environmental Services, Inc. — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), Perma-Fix Environmental Services, Inc.

(PESI) is pulling ahead at 4. 3% versus -40. 1% for 374Water, Inc. (SCWO). On earnings-per-share growth, the picture is similar: Perma-Fix Environmental Services, Inc. grew EPS 43. 6% year-over-year, compared to -48. 7% for 374Water, Inc.. Over a 3-year CAGR, SCWO leads at 110. 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.

Perma-Fix Environmental Services, Inc.

(PESI) is the more profitable company, earning -22. 3% net margin versus -27. 9% for 374Water, Inc. — meaning it keeps -22. 3% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: PESI leads at -19. 0% versus -28. 7% for SCWO. At the gross margin level — before operating expenses — PESI leads at 9. 6%, 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, 374Water, Inc.

(SCWO) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (+1715% 10Y return). Perma-Fix Environmental Services, Inc. (PESI) carries a higher beta of 1. 85 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (SCWO: +1715%, PESI: +200. 4%), 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.

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.