ALGM vs DIOD

For growth investors, Diodes Incorporated (DIOD) is the stronger pick with 13.

0% revenue growth year-over-year, versus -30. 9% for Allegro MicroSystems, Inc. (ALGM). Diodes Incorporated (DIOD) offers the better valuation at 81. 2x trailing P/E (50. 0x forward), making it the more compelling value choice. Analysts rate Allegro MicroSystems, Inc. (ALGM) a "Buy" — based on 13 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 forward P/E, Diodes Incorporated is actually cheaper at 50.

0x.

Over the past 5 years, Allegro MicroSystems, Inc.

(ALGM) delivered a total return of +106. 7%, compared to +60. 4% for Diodes Incorporated (DIOD). Over 10 years, the gap is even starker: DIOD returned +505. 7% versus ALGM's +190. 2%. 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), Diodes Incorporated (DIOD) is the lower-risk stock at 2.

11β versus Allegro MicroSystems, Inc. 's 2. 43β — meaning ALGM is approximately 15% more volatile than DIOD relative to the S&P 500. On balance sheet safety, Diodes Incorporated (DIOD) carries a lower debt/equity ratio of 5% versus 40% for Allegro MicroSystems, Inc. — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), Diodes Incorporated (DIOD) is pulling ahead at 13.

0% versus -30. 9% for Allegro MicroSystems, Inc. (ALGM). On earnings-per-share growth, the picture is similar: Diodes Incorporated grew EPS 50. 5% year-over-year, compared to -150. 0% for Allegro MicroSystems, Inc.. Over a 3-year CAGR, ALGM leads at -1. 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.

Diodes Incorporated (DIOD) is the more profitable company, earning 4.

5% net margin versus -10. 1% for Allegro MicroSystems, Inc. — meaning it keeps 4. 5% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: DIOD leads at 2. 4% versus -2. 7% for ALGM. At the gross margin level — before operating expenses — ALGM leads at 44. 3%, 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 50.

0x forward P/E versus 96. 7x for Allegro MicroSystems, Inc. — 46. 7x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for ALGM: -12. 7% to $44. 83.

None of the stocks in this comparison currently pay a material dividend.

All are effectively zero-yield and should be held for capital appreciation rather than income.

For long-horizon retirement investors, Diodes Incorporated (DIOD) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (+505.

7% 10Y return). Allegro MicroSystems, Inc. (ALGM) carries a higher beta of 2. 43 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (DIOD: +505. 7%, ALGM: +190. 2%), 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.

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.