VNDA vs INVA vs PRGO vs SIGA vs MCK

For growth investors, Innoviva, Inc.

(INVA) is the stronger pick with 18. 5% revenue growth year-over-year, versus -31. 8% for SIGA Technologies, Inc. (SIGA). Innoviva, Inc. (INVA) offers the better valuation at 6. 9x trailing P/E (7. 3x forward), making it the more compelling value choice. Analysts rate Vanda Pharmaceuticals Inc. (VNDA) 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.

On trailing P/E, Innoviva, Inc.

(INVA) is the cheapest at 6. 9x versus McKesson Corporation at 19. 2x. On forward P/E, SIGA Technologies, Inc. is actually cheaper at 2. 8x — 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: McKesson Corporation wins at 0. 43x versus Innoviva, Inc. 's 0. 71x — a PEG below 1. 0 traditionally signals the market is underpricing earnings growth.

Over the past 5 years, McKesson Corporation (MCK) delivered a total return of +270.

4%, compared to -64. 8% for Vanda Pharmaceuticals Inc. (VNDA). Over 10 years, the gap is even starker: SIGA returned +772. 1% versus PRGO's -77. 7%. 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), McKesson Corporation (MCK) is the lower-risk stock at -0.

02β versus Perrigo Company plc's 1. 21β — meaning PRGO is approximately -7506% more volatile than MCK relative to the S&P 500. On balance sheet safety, SIGA Technologies, Inc. (SIGA) carries a lower debt/equity ratio of 0% versus 135% for Perrigo Company plc — giving it more financial flexibility in a downturn.

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

(INVA) is pulling ahead at 18. 5% versus -31. 8% for SIGA Technologies, Inc. (SIGA). On earnings-per-share growth, the picture is similar: Innoviva, Inc. grew EPS 816. 7% year-over-year, compared to -1068. 8% for Vanda Pharmaceuticals Inc.. Over a 3-year CAGR, MCK leads at 13. 4% 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.

Innoviva, Inc.

(INVA) is the more profitable company, earning 63. 8% net margin versus -102. 0% for Vanda Pharmaceuticals Inc. — meaning it keeps 63. 8% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: INVA leads at 38. 5% versus -70. 0% for VNDA. At the gross margin level — before operating expenses — VNDA leads at 94. 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.

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, McKesson Corporation (MCK) is the more undervalued stock at a PEG of 0. 43x versus Innoviva, Inc. 's 0. 71x. A PEG below 1. 0 is traditionally considered the threshold for growth-adjusted undervaluation. On forward earnings alone, SIGA Technologies, Inc. (SIGA) trades at 2. 8x forward P/E versus 16. 7x for McKesson Corporation — 13. 8x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for PRGO: 209. 1% to $36. 20.

In this comparison, SIGA (12.

5% yield), PRGO (9. 8% yield), MCK (0. 4% yield) pay a dividend. VNDA, INVA do not pay a meaningful dividend and should not be held primarily for income.

For long-horizon retirement investors, McKesson Corporation (MCK) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (low volatility (β -0.

02), +339. 0% 10Y return). Both have compounded well over 10 years (MCK: +339. 0%, VNDA: -28. 1%), 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: VNDA is a small-cap quality compounder stock; INVA is a small-cap high-growth stock; PRGO is a small-cap income-oriented stock; SIGA is a small-cap deep-value stock; MCK is a mid-cap quality compounder stock. PRGO, SIGA pay a dividend while VNDA, INVA, MCK 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.