MRSN vs AGEN

For growth investors, Agenus Inc.

(AGEN) is the stronger pick with 10. 4% revenue growth year-over-year, versus 9. 9% for Mersana Therapeutics, Inc. (MRSN). Analysts rate Mersana Therapeutics, Inc. (MRSN) a "Buy" — based on 19 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, Mersana Therapeutics, Inc.

(MRSN) delivered a total return of -92. 5%, compared to -93. 9% for Agenus Inc. (AGEN). Over 10 years, the gap is even starker: MRSN returned -91. 7% versus AGEN's -94. 3%. 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), Mersana Therapeutics, Inc.

(MRSN) is the lower-risk stock at 2. 22β versus Agenus Inc. 's 2. 72β — meaning AGEN is approximately 23% more volatile than MRSN relative to the S&P 500.

By revenue growth (latest reported year), Agenus Inc.

(AGEN) is pulling ahead at 10. 4% versus 9. 9% for Mersana Therapeutics, Inc. (MRSN). On earnings-per-share growth, the picture is similar: Agenus Inc. grew EPS 100. 0% year-over-year, compared to 61. 8% for Mersana Therapeutics, Inc.. Over a 3-year CAGR, MRSN leads at 880. 2% 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.

Agenus Inc.

(AGEN) is the more profitable company, earning 0. 1% net margin versus -170. 9% for Mersana Therapeutics, Inc. — meaning it keeps 0. 1% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: AGEN leads at -18. 0% versus -181. 1% for MRSN. At the gross margin level — before operating expenses — MRSN leads at 100. 0%, 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 AGEN: 95.

5% to $7. 33.

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, Mersana Therapeutics, Inc.

(MRSN) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding. Agenus Inc. (AGEN) carries a higher beta of 2. 72 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (MRSN: -91. 7%, AGEN: -94. 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.