MPWR vs POWI

For growth investors, Monolithic Power Systems, Inc.

(MPWR) is the stronger pick with 26. 4% revenue growth year-over-year, versus 5. 9% for Power Integrations, Inc. (POWI). Monolithic Power Systems, Inc. (MPWR) offers the better valuation at 125. 6x trailing P/E (67. 2x 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, Monolithic Power Systems, Inc.

(MPWR) is the cheapest at 125. 6x versus Power Integrations, Inc. at 187. 9x. On forward P/E, Power Integrations, Inc. is actually cheaper at 58. 7x — notably different from the trailing picture, reflecting expected earnings growth.

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

(MPWR) delivered a total return of +404. 2%, compared to -1. 3% for Power Integrations, Inc. (POWI). Over 10 years, the gap is even starker: MPWR returned +25. 3% versus POWI's +239. 0%. 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. 11β versus Monolithic Power Systems, Inc. 's 2. 27β — meaning MPWR is approximately 8% more volatile than POWI relative to the S&P 500.

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

(MPWR) is pulling ahead at 26. 4% versus 5. 9% for Power Integrations, Inc. (POWI). On earnings-per-share growth, the picture is similar: Power Integrations, Inc. grew EPS -30. 4% 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 5. 0% for Power Integrations, 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 4. 8% for POWI. 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, Power Integrations, Inc.

(POWI) trades at 58. 7x forward P/E versus 67. 2x for Monolithic Power Systems, Inc. — 8. 5x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for POWI: 7. 8% to $79. 00.

All stocks in this comparison pay dividends.

Power Integrations, Inc. (POWI) offers the highest yield at 1. 1%, versus 0. 4% for Monolithic Power Systems, Inc. (MPWR).

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. 1% yield, +239. 0% 10Y return). Monolithic Power Systems, Inc. (MPWR) carries a higher beta of 2. 27 — 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: +239. 0%, MPWR: +25. 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.

Both stocks operate in the Technology sector, making this a peer-level intra-sector comparison — the same macro tailwinds and headwinds will affect both.

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