AMPH vs SUPN

For growth investors, Supernus Pharmaceuticals, Inc.

(SUPN) is the stronger pick with 8. 6% revenue growth year-over-year, versus -1. 7% for Amphastar Pharmaceuticals, Inc. (AMPH). Amphastar Pharmaceuticals, Inc. (AMPH) offers the better valuation at 11. 8x trailing P/E (7. 4x forward), making it the more compelling value choice. Analysts rate Supernus Pharmaceuticals, Inc. (SUPN) a "Buy" — based on 14 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, Amphastar Pharmaceuticals, Inc.

is actually cheaper at 7. 4x.

Over the past 5 years, Supernus Pharmaceuticals, Inc.

(SUPN) delivered a total return of +78. 0%, compared to +28. 6% for Amphastar Pharmaceuticals, Inc. (AMPH). Over 10 years, the gap is even starker: SUPN returned +228. 4% versus AMPH's +102. 8%. 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), Supernus Pharmaceuticals, Inc.

(SUPN) is the lower-risk stock at 0. 78β versus Amphastar Pharmaceuticals, Inc. 's 1. 40β — meaning AMPH is approximately 78% more volatile than SUPN relative to the S&P 500. On balance sheet safety, Supernus Pharmaceuticals, Inc. (SUPN) carries a lower debt/equity ratio of 4% versus 83% for Amphastar Pharmaceuticals, Inc. — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), Supernus Pharmaceuticals, Inc.

(SUPN) is pulling ahead at 8. 6% versus -1. 7% for Amphastar Pharmaceuticals, Inc. (AMPH). On earnings-per-share growth, the picture is similar: Amphastar Pharmaceuticals, Inc. grew EPS -33. 7% year-over-year, compared to -151. 5% for Supernus Pharmaceuticals, Inc.. Over a 3-year CAGR, AMPH leads at 13. 0% 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.

Amphastar Pharmaceuticals, Inc.

(AMPH) is the more profitable company, earning 13. 6% net margin versus -5. 4% for Supernus Pharmaceuticals, Inc. — meaning it keeps 13. 6% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: AMPH leads at 19. 5% versus -5. 1% for SUPN. At the gross margin level — before operating expenses — SUPN leads at 89. 6%, 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, Amphastar Pharmaceuticals, Inc.

(AMPH) trades at 7. 4x forward P/E versus 24. 1x for Supernus Pharmaceuticals, Inc. — 16. 7x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for SUPN: 14. 8% to $60. 00.

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, Supernus Pharmaceuticals, Inc.

(SUPN) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (low volatility (β 0. 78), +228. 4% 10Y return). Both have compounded well over 10 years (SUPN: +228. 4%, AMPH: +102. 8%), 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 Healthcare sector, making this a peer-level intra-sector comparison — the same macro tailwinds and headwinds will affect both.

In terms of investment character: AMPH is a small-cap deep-value stock; SUPN is a small-cap quality compounder stock. 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.