GWH vs FLUX vs NRGV vs STEM

For growth investors, Energy Vault Holdings, Inc.

(NRGV) is the stronger pick with 340. 9% revenue growth year-over-year, versus -74. 9% for ESS Tech, Inc. (GWH). Analysts rate Energy Vault Holdings, Inc. (NRGV) a "Buy" — based on 7 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, Energy Vault Holdings, Inc.

(NRGV) delivered a total return of -57. 7%, compared to -99. 2% for ESS Tech, Inc. (GWH). Over 10 years, the gap is even starker: NRGV returned -57. 1% versus GWH's -99. 2%. 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), Flux Power Holdings, Inc.

(FLUX) is the lower-risk stock at 2. 30β versus Stem, Inc. 's 3. 66β — meaning STEM is approximately 59% more volatile than FLUX relative to the S&P 500. On balance sheet safety, ESS Tech, Inc. (GWH) carries a lower debt/equity ratio of 45% versus 107% for Energy Vault Holdings, Inc. — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), Energy Vault Holdings, Inc.

(NRGV) is pulling ahead at 340. 9% versus -74. 9% for ESS Tech, Inc. (GWH). On earnings-per-share growth, the picture is similar: Stem, Inc. grew EPS 91. 3% year-over-year, compared to 20. 0% for Flux Power Holdings, Inc.. Over a 3-year CAGR, GWH leads at 21. 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.

Stem, Inc.

(STEM) is the more profitable company, earning 88. 2% net margin versus -40. 1% for ESS Tech, Inc. — meaning it keeps 88. 2% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: FLUX leads at -7. 6% versus -35. 2% for GWH. At the gross margin level — before operating expenses — STEM leads at 35. 3%, 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, Energy Vault Holdings, Inc.

(NRGV) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding. ESS Tech, Inc. (GWH) carries a higher beta of 2. 53 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (NRGV: -57. 1%, GWH: -99. 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.

These companies operate in different sectors (GWH (Industrials) and FLUX (Industrials) and NRGV (Utilities) and STEM (Technology)), which means they face different economic cycles, regulatory environments, and macro sensitivities — making direct comparison nuanced.

In terms of investment character: GWH is a small-cap quality compounder stock; FLUX is a small-cap quality compounder stock; NRGV is a small-cap high-growth stock; STEM 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.