RELL vs VICR vs POWI vs MPWR

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). Vicor Corporation (VICR) offers the better valuation at 98. 3x trailing P/E (92. 5x forward), making it the more compelling value choice. Analysts rate Vicor Corporation (VICR) 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.

On trailing P/E, Vicor Corporation (VICR) is the cheapest at 98.

3x 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. The PEG ratio (P/E divided by earnings growth rate) is the most growth-adjusted single valuation metric: Vicor Corporation wins at 2. 07x versus Monolithic Power Systems, Inc. 's 2. 28x.

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: VICR returned +26. 5% 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), Richardson Electronics, Ltd.

(RELL) is the lower-risk stock at 2. 03β versus Vicor Corporation's 2. 87β — meaning VICR is approximately 42% more volatile than RELL relative to the S&P 500. On balance sheet safety, Monolithic Power Systems, Inc. (MPWR) carries a lower debt/equity ratio of 1% versus 2% for Vicor 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 5. 9% for Power Integrations, Inc. (POWI). On earnings-per-share growth, the picture is similar: Vicor Corporation grew EPS 1764% 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.

Vicor Corporation (VICR) is the more profitable company, earning 29.

1% net margin versus -0. 5% for Richardson Electronics, Ltd. — meaning it keeps 29. 1% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: MPWR leads at 26. 1% versus -1. 2% for RELL. 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.

The PEG ratio (forward P/E divided by expected earnings growth rate) is the most precise measure of undervaluation relative to growth potential.

By this metric, Vicor Corporation (VICR) is the more undervalued stock at a PEG of 2. 07x versus Monolithic Power Systems, Inc. 's 2. 28x. Both stocks trade at elevated growth-adjusted valuations, so expected growth needs to materialise. On forward earnings alone, Power Integrations, Inc. (POWI) trades at 58. 7x forward P/E versus 92. 5x for Vicor Corporation — 33. 8x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for POWI: 7. 8% to $79. 00.

In this comparison, RELL (1.

8% yield), POWI (1. 1% yield), MPWR (0. 4% yield) pay a dividend. VICR does not pay a meaningful dividend and should not be held primarily for income.

For long-horizon retirement investors, Richardson Electronics, Ltd.

(RELL) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (1. 8% yield, +240. 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 (RELL: +240. 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: RELL is a small-cap quality compounder stock; VICR is a mid-cap quality compounder stock; POWI is a small-cap quality compounder stock; MPWR is a mid-cap high-growth stock. RELL, POWI pay a dividend while VICR, 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.