IPWR vs MPWR vs POWI vs DIOD

For growth investors, Monolithic Power Systems, Inc.

(MPWR) is the stronger pick with 26. 4% revenue growth year-over-year, versus -56. 1% for Ideal Power Inc. (IPWR). Diodes Incorporated (DIOD) offers the better valuation at 78. 7x trailing P/E (48. 5x forward), making it the more compelling value choice. Analysts rate Monolithic Power Systems, Inc. (MPWR) a "Buy" — based on 25 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, Diodes Incorporated (DIOD) is the cheapest at 78.

7x versus Power Integrations, Inc. at 184. 2x. On forward P/E, Diodes Incorporated is actually cheaper at 48. 5x.

Over the past 5 years, Monolithic Power Systems, Inc.

(MPWR) delivered a total return of +366. 2%, compared to -43. 0% for Ideal Power Inc. (IPWR). Over 10 years, the gap is even starker: MPWR returned +24. 9% versus IPWR's -90. 3%. 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), Power Integrations, Inc.

(POWI) is the lower-risk stock at 2. 08β versus Ideal Power Inc. 's 2. 41β — meaning IPWR is approximately 16% more volatile than POWI relative to the S&P 500. On balance sheet safety, Monolithic Power Systems, Inc. (MPWR) carries a lower debt/equity ratio of 1% versus 5% for Ideal Power Inc. — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), Monolithic Power Systems, Inc.

(MPWR) is pulling ahead at 26. 4% versus -56. 1% for Ideal Power Inc. (IPWR). On earnings-per-share growth, the picture is similar: Diodes Incorporated grew EPS 50. 5% 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 -280. 4% for Ideal Power Inc. — meaning it keeps 22. 1% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: MPWR leads at 26. 1% versus -289. 8% for IPWR. At the gross margin level — before operating expenses — MPWR leads at 55. 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.

On forward earnings alone, Diodes Incorporated (DIOD) trades at 48.

5x forward P/E versus 73. 1x for Monolithic Power Systems, Inc. — 24. 6x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for POWI: 10. 0% to $79. 00.

In this comparison, POWI (1.

2% yield), MPWR (0. 4% yield) pay a dividend. IPWR, DIOD 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). Ideal Power Inc. (IPWR) carries a higher beta of 2. 41 — 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%, IPWR: -90. 3%), 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 (IPWR (Industrials) and MPWR (Technology) and POWI (Technology) and DIOD (Technology)), which means they face different economic cycles, regulatory environments, and macro sensitivities — making direct comparison nuanced.

In terms of investment character: IPWR is a small-cap quality compounder stock; MPWR is a mid-cap high-growth stock; POWI is a small-cap quality compounder stock; DIOD is a small-cap quality compounder stock. POWI pays a dividend while IPWR, MPWR, DIOD 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.