SERA vs INVA vs NTRA vs PRGO

For growth investors, Natera, Inc.

(NTRA) is the stronger pick with 35. 9% revenue growth year-over-year, versus -2. 8% for Perrigo Company plc (PRGO). Innoviva, Inc. (INVA) offers the better valuation at 6. 9x trailing P/E (11. 9x forward), making it the more compelling value choice. Analysts rate Sera Prognostics, Inc. (SERA) a "Buy" — based on 5 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 forward P/E, Perrigo Company plc is actually cheaper at 5.

6x — notably different from the trailing picture, reflecting expected earnings growth.

Over the past 5 years, Natera, Inc.

(NTRA) delivered a total return of +115. 9%, compared to -83. 9% for Sera Prognostics, Inc. (SERA). Over 10 years, the gap is even starker: NTRA returned +20. 9% versus SERA's -83. 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), Innoviva, Inc.

(INVA) is the lower-risk stock at 0. 13β versus Sera Prognostics, Inc. 's 1. 56β — meaning SERA is approximately 1137% more volatile than INVA relative to the S&P 500. On balance sheet safety, Sera Prognostics, Inc. (SERA) carries a lower debt/equity ratio of 3% versus 135% for Perrigo Company plc — giving it more financial flexibility in a downturn.

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

(NTRA) is pulling ahead at 35. 9% versus -2. 8% for Perrigo Company plc (PRGO). On earnings-per-share growth, the picture is similar: Innoviva, Inc. grew EPS 816. 7% year-over-year, compared to -723. 2% for Perrigo Company plc. Over a 3-year CAGR, NTRA leads at 41. 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.

Innoviva, Inc.

(INVA) is the more profitable company, earning 63. 8% net margin versus -394. 2% for Sera Prognostics, 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 -450. 7% for SERA. At the gross margin level — before operating expenses — INVA leads at 72. 3%, 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, Perrigo Company plc (PRGO) trades at 5.

6x forward P/E versus 11. 9x for Innoviva, Inc. — 6. 4x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for SERA: 160. 4% to $5. 00.

In this comparison, PRGO (9.

8% yield) pays a dividend. SERA, INVA, NTRA do not pay a meaningful dividend and should not be held primarily for income.

For long-horizon retirement investors, Innoviva, Inc.

(INVA) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (low volatility (β 0. 13)). Sera Prognostics, Inc. (SERA) carries a higher beta of 1. 56 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (INVA: +94. 9%, SERA: -83. 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.

In terms of investment character: SERA is a small-cap quality compounder stock; INVA is a small-cap high-growth stock; NTRA is a mid-cap high-growth stock; PRGO is a small-cap income-oriented stock. PRGO pays a dividend while SERA, INVA, NTRA 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.