POWI vs ON vs MPWR vs STM

For growth investors, Monolithic Power Systems, Inc.

(MPWR) is the stronger pick with 26. 4% revenue growth year-over-year, versus -15. 3% for ON Semiconductor Corporation (ON). Monolithic Power Systems, Inc. (MPWR) offers the better valuation at 123. 6x trailing P/E (73. 1x forward), making it the more compelling value choice. Analysts rate Power Integrations, Inc. (POWI) a "Buy" — based on 16 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 123. 6x versus ON Semiconductor Corporation at 346. 8x. On forward P/E, ON Semiconductor Corporation is actually cheaper at 34. 4x — 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 +366. 2%, compared to -8. 3% for Power Integrations, Inc. (POWI). Over 10 years, the gap is even starker: MPWR returned +24. 9% versus POWI's +232. 7%. 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), ON Semiconductor Corporation (ON) is the lower-risk stock at 1.

95β versus Monolithic Power Systems, Inc. 's 2. 28β — meaning MPWR is approximately 17% more volatile than ON relative to the S&P 500. On balance sheet safety, Monolithic Power Systems, Inc. (MPWR) carries a lower debt/equity ratio of 1% versus 45% for ON Semiconductor Corporation — 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 -15. 3% for ON Semiconductor Corporation (ON). On earnings-per-share growth, the picture is similar: Power Integrations, Inc. grew EPS -30. 4% year-over-year, compared to -92. 0% for ON Semiconductor Corporation. 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 1. 4% for STMicroelectronics N. V. — 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 2. 7% for STM. 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, ON Semiconductor Corporation (ON) trades at 34.

4x forward P/E versus 73. 1x for Monolithic Power Systems, Inc. — 38. 8x 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), STM (0. 6% yield), MPWR (0. 4% yield) pay a dividend. ON does not pay a meaningful dividend and should not be held primarily for income.

For long-horizon retirement investors, STMicroelectronics N.

V. (STM) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (0. 6% yield, +981. 9% 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 (STM: +981. 9%, 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.

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: POWI is a small-cap quality compounder stock; ON is a mid-cap quality compounder stock; MPWR is a mid-cap high-growth stock; STM is a mid-cap quality compounder stock. POWI, STM pay a dividend while ON, MPWR 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.