XGN vs CSTL vs NTRA vs CDNA

For growth investors, Natera, Inc.

(NTRA) is the stronger pick with 35. 9% revenue growth year-over-year, versus 3. 7% for Castle Biosciences, Inc. (CSTL). Analysts rate Castle Biosciences, Inc. (CSTL) a "Buy" — based on 11 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, Natera, Inc.

(NTRA) delivered a total return of +115. 9%, compared to -80. 8% for Exagen Inc. (XGN). Over 10 years, the gap is even starker: NTRA returned +20. 9% versus XGN's -84. 2%. 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), Castle Biosciences, Inc.

(CSTL) is the lower-risk stock at 0. 88β versus CareDx, Inc's 1. 39β — meaning CDNA is approximately 58% more volatile than CSTL relative to the S&P 500. On balance sheet safety, CareDx, Inc (CDNA) carries a lower debt/equity ratio of 6% versus 31% for Exagen Inc. — giving it more financial flexibility in a downturn.

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

(NTRA) is pulling ahead at 35. 9% versus 3. 7% for Castle Biosciences, Inc. (CSTL). On earnings-per-share growth, the picture is similar: Natera, Inc. grew EPS 0. 7% year-over-year, compared to -233. 9% for Castle Biosciences, Inc.. 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.

CareDx, Inc (CDNA) is the more profitable company, earning -5.

6% net margin versus -30. 0% for Exagen Inc. — meaning it keeps -5. 6% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: CDNA leads at -5. 5% versus -21. 1% for XGN. At the gross margin level — before operating expenses — CSTL leads at 68. 7%, 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 CSTL: 148.

4% to $47. 80.

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, Castle Biosciences, Inc.

(CSTL) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (low volatility (β 0. 88)). Both have compounded well over 10 years (CSTL: -10. 1%, XGN: -84. 2%), 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: XGN is a small-cap high-growth stock; CSTL is a small-cap quality compounder stock; NTRA is a mid-cap high-growth stock; CDNA is a small-cap quality compounder stock. 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.