HALO vs ALNY

For growth investors, Alnylam Pharmaceuticals, Inc.

(ALNY) is the stronger pick with 65. 2% revenue growth year-over-year, versus 37. 6% for Halozyme Therapeutics, Inc. (HALO). Halozyme Therapeutics, Inc. (HALO) offers the better valuation at 25. 5x trailing P/E (8. 1x forward), making it the more compelling value choice. Analysts rate Halozyme Therapeutics, Inc. (HALO) a "Buy" — based on 27 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, Halozyme Therapeutics, Inc.

(HALO) is the cheapest at 25. 5x versus Alnylam Pharmaceuticals, Inc. at 127. 0x. On forward P/E, Halozyme Therapeutics, Inc. is actually cheaper at 8. 1x.

Over the past 5 years, Alnylam Pharmaceuticals, Inc.

(ALNY) delivered a total return of +125. 4%, compared to +37. 0% for Halozyme Therapeutics, Inc. (HALO). Over 10 years, the gap is even starker: HALO returned +570. 7% versus ALNY's +411. 9%. 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), Halozyme Therapeutics, Inc.

(HALO) is the lower-risk stock at 0. 56β versus Alnylam Pharmaceuticals, Inc. 's 0. 71β — meaning ALNY is approximately 26% more volatile than HALO relative to the S&P 500.

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

(ALNY) is pulling ahead at 65. 2% versus 37. 6% for Halozyme Therapeutics, Inc. (HALO). On earnings-per-share growth, the picture is similar: Alnylam Pharmaceuticals, Inc. grew EPS 206. 9% year-over-year, compared to -25. 4% for Halozyme Therapeutics, Inc.. Over a 3-year CAGR, ALNY leads at 53. 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.

Halozyme Therapeutics, Inc.

(HALO) is the more profitable company, earning 22. 7% net margin versus 8. 4% for Alnylam Pharmaceuticals, Inc. — meaning it keeps 22. 7% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: HALO leads at 58. 4% versus 13. 5% for ALNY. At the gross margin level — before operating expenses — ALNY leads at 81. 8%, 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, Halozyme Therapeutics, Inc.

(HALO) trades at 8. 1x forward P/E versus 44. 2x for Alnylam Pharmaceuticals, Inc. — 36. 1x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for ALNY: 50. 6% to $445. 67.

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, Halozyme Therapeutics, Inc.

(HALO) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (low volatility (β 0. 56), +570. 7% 10Y return). Both have compounded well over 10 years (HALO: +570. 7%, ALNY: +411. 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 Healthcare 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.