MIRM vs ALNY

For growth investors, Alnylam Pharmaceuticals, Inc.

(ALNY) is the stronger pick with 65. 2% revenue growth year-over-year, versus 54. 7% for Mirum Pharmaceuticals, Inc. (MIRM). Alnylam Pharmaceuticals, Inc. (ALNY) offers the better valuation at 130. 0x trailing P/E (45. 2x forward), making it the more compelling value choice. Analysts rate Mirum Pharmaceuticals, Inc. (MIRM) a "Buy" — based on 18 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.

Over the past 5 years, Mirum Pharmaceuticals, Inc.

(MIRM) delivered a total return of +521. 9%, compared to +129. 4% for Alnylam Pharmaceuticals, Inc. (ALNY). Over 10 years, the gap is even starker: MIRM returned +733. 3% versus ALNY's +445. 5%. 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), Alnylam Pharmaceuticals, Inc.

(ALNY) is the lower-risk stock at 0. 71β versus Mirum Pharmaceuticals, Inc. 's 1. 02β — meaning MIRM is approximately 45% more volatile than ALNY relative to the S&P 500. On balance sheet safety, Mirum Pharmaceuticals, Inc. (MIRM) carries a lower debt/equity ratio of 102% versus 162% for Alnylam Pharmaceuticals, Inc. — giving it more financial flexibility in a downturn.

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

(ALNY) is pulling ahead at 65. 2% versus 54. 7% for Mirum Pharmaceuticals, Inc. (MIRM). On earnings-per-share growth, the picture is similar: Alnylam Pharmaceuticals, Inc. grew EPS 206. 9% year-over-year, compared to 74. 6% for Mirum Pharmaceuticals, Inc.. Over a 3-year CAGR, MIRM leads at 89. 1% 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.

Alnylam Pharmaceuticals, Inc.

(ALNY) is the more profitable company, earning 8. 4% net margin versus -4. 5% for Mirum Pharmaceuticals, Inc. — meaning it keeps 8. 4% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: ALNY leads at 13. 5% versus -4. 2% for MIRM. 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.

Analyst consensus price targets imply the most upside for ALNY: 47.

1% 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, Alnylam Pharmaceuticals, Inc.

(ALNY) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (low volatility (β 0. 71), +445. 5% 10Y return). Both have compounded well over 10 years (ALNY: +445. 5%, MIRM: +733. 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 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.