WATT vs PSIX vs POWI vs MPWR vs PLUG

For growth investors, Energous Corporation (WATT) is the stronger pick with 62.

0% revenue growth year-over-year, versus -100. 0% for Power Solutions International, Inc. (PSIX). Power Solutions International, Inc. (PSIX) offers the better valuation at 14. 6x trailing P/E (15. 1x forward), making it the more compelling value choice. Analysts rate Power Solutions International, Inc. (PSIX) a "Buy" — based on 6 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.

On trailing P/E, Power Solutions International, Inc.

(PSIX) is the cheapest at 14. 6x versus Power Integrations, Inc. at 184. 2x. On forward P/E, Power Solutions International, Inc. is actually cheaper at 15. 1x.

Over the past 5 years, Power Solutions International, Inc.

(PSIX) delivered a total return of +1080%, compared to -98. 4% for Energous Corporation (WATT). Over 10 years, the gap is even starker: MPWR returned +24. 9% versus WATT's -99. 6%. 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), Energous Corporation (WATT) is the lower-risk stock at 1.

69β versus Power Solutions International, Inc. 's 3. 33β — meaning PSIX is approximately 97% more volatile than WATT relative to the S&P 500. On balance sheet safety, Monolithic Power Systems, Inc. (MPWR) carries a lower debt/equity ratio of 1% versus 20% for Plug Power Inc. — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), Energous Corporation (WATT) is pulling ahead at 62.

0% versus -100. 0% for Power Solutions International, Inc. (PSIX). On earnings-per-share growth, the picture is similar: Plug Power Inc. grew EPS 100. 0% year-over-year, compared to -65. 2% for Monolithic Power Systems, Inc.. Over a 3-year CAGR, MPWR leads at 15. 9% 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.

Monolithic Power Systems, Inc.

(MPWR) is the more profitable company, earning 22. 1% net margin versus -24. 0% for Energous Corporation — meaning it keeps 22. 1% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: PLUG leads at 38. 1% versus -24. 0% for WATT. At the gross margin level — before operating expenses — PLUG leads at 99. 8%, 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.

On forward earnings alone, Power Solutions International, Inc.

(PSIX) trades at 15. 1x forward P/E versus 73. 1x for Monolithic Power Systems, Inc. — 58. 0x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for PSIX: 44. 8% to $104. 26.

In this comparison, POWI (1.

2% yield), MPWR (0. 4% yield) pay a dividend. WATT, PSIX, PLUG do not pay a meaningful dividend and should not be held primarily for income.

For long-horizon retirement investors, Power Integrations, Inc.

(POWI) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (1. 2% yield, +232. 7% 10Y return). Monolithic Power Systems, Inc. (MPWR) carries a higher beta of 2. 28 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (POWI: +232. 7%, MPWR: +24. 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.

These companies operate in different sectors (WATT (Technology) and PSIX (Industrials) and POWI (Technology) and MPWR (Technology) and PLUG (Industrials)), which means they face different economic cycles, regulatory environments, and macro sensitivities — making direct comparison nuanced.

In terms of investment character: WATT is a small-cap high-growth stock; PSIX is a small-cap deep-value stock; POWI is a small-cap quality compounder stock; MPWR is a mid-cap high-growth stock; PLUG is a small-cap quality compounder stock. POWI pays a dividend while WATT, PSIX, MPWR, PLUG 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.