MIRM vs ABBV vs MRK vs REGN

For growth investors, Mirum Pharmaceuticals, Inc.

(MIRM) is the stronger pick with 54. 7% revenue growth year-over-year, versus 1. 0% for Regeneron Pharmaceuticals, Inc. (REGN). Merck & Co. , Inc. (MRK) offers the better valuation at 15. 4x trailing P/E (21. 9x 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.

On trailing P/E, Merck & Co.

, Inc. (MRK) is the cheapest at 15. 4x versus AbbVie Inc. at 85. 5x. On forward P/E, AbbVie Inc. is actually cheaper at 14. 3x — 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: Merck & Co. , Inc. wins at 1. 03x versus Regeneron Pharmaceuticals, Inc. 's 2. 43x — a reasonable growth-adjusted valuation.

Over the past 5 years, Mirum Pharmaceuticals, Inc.

(MIRM) delivered a total return of +451. 3%, compared to +43. 6% for Regeneron Pharmaceuticals, Inc. (REGN). Over 10 years, the gap is even starker: MIRM returned +679. 2% versus REGN's +90. 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), AbbVie Inc.

(ABBV) is the lower-risk stock at 0. 34β versus Mirum Pharmaceuticals, Inc. 's 1. 02β — meaning MIRM is approximately 202% more volatile than ABBV relative to the S&P 500. On balance sheet safety, Regeneron Pharmaceuticals, Inc. (REGN) carries a lower debt/equity ratio of 9% versus 102% for Mirum Pharmaceuticals, Inc. — giving it more financial flexibility in a downturn.

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

(MIRM) is pulling ahead at 54. 7% versus 1. 0% for Regeneron Pharmaceuticals, Inc. (REGN). On earnings-per-share growth, the picture is similar: Mirum Pharmaceuticals, Inc. grew EPS 74. 6% year-over-year, compared to -0. 8% for AbbVie 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.

Regeneron Pharmaceuticals, Inc.

(REGN) is the more profitable company, earning 31. 4% net margin versus -4. 5% for Mirum Pharmaceuticals, Inc. — meaning it keeps 31. 4% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: MRK leads at 36. 2% versus -4. 2% for MIRM. At the gross margin level — before operating expenses — REGN leads at 85. 4%, 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, Merck & Co. , Inc. (MRK) is the more undervalued stock at a PEG of 1. 03x versus Regeneron Pharmaceuticals, Inc. 's 2. 43x. A PEG below 1. 5 suggests fair-to-attractive pricing relative to expected growth. On forward earnings alone, AbbVie Inc. (ABBV) trades at 14. 3x forward P/E versus 21. 9x for Merck & Co. , Inc. — 7. 7x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for ABBV: 26. 6% to $256. 64.

In this comparison, ABBV (3.

2% yield), MRK (2. 9% yield), REGN (0. 5% yield) pay a dividend. MIRM does not pay a meaningful dividend and should not be held primarily for income.

For long-horizon retirement investors, AbbVie Inc.

(ABBV) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (low volatility (β 0. 34), 3. 2% yield, +295. 5% 10Y return). Both have compounded well over 10 years (ABBV: +295. 5%, REGN: +90. 0%), 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: MIRM is a small-cap high-growth stock; ABBV is a large-cap income-oriented stock; MRK is a large-cap deep-value stock; REGN is a mid-cap deep-value stock. ABBV, MRK pay a dividend while MIRM, REGN 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.