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Castle Biosciences vs Twist Bioscience

Castle Biosciences and Twist Bioscience are similar in size: $344m and $377m of revenue in their latest fiscal years. Twist Bioscience grew faster (20.3% against 3.7%). Castle Biosciences kept more of each dollar of sales as profit: a net margin of -7.0% against -20.6%. Twist Bioscience carries less debt relative to equity (0.0% against 2.2%).

Latest fiscal yearCastle BiosciencesCSTL, 2025Twist BioscienceTWST, 2025
Revenue $344m $377m
Revenue growth 3.7% 20.3%
Net income −$24.2m −$77.7m
Operating margin -12.4% -36.2%
Net margin -7.0% -20.6%
Return on equity -5.2% -16.4%
Free cash flow $28.3m −$75.6m
Cash $117m $183m
Total debt $10.2m $0
Debt to equity 2.2% 0.0%
Dividend per share — —
Dividend yield — —
Share buybacks — —
Employees 883 979
Market value $1.07bn $8.74bn
Price vs our value range — —
Moat score 32 (Weak) 11 (Weak)
Insider trades, 12 months 0 buys, 170 sales 0 buys, 180 sales

Each figure is from the company's latest annual report and links to the page it comes from. Fiscal years can end on different dates. Market value and the value verdict use the delayed price shown on the stock pages. Not a recommendation.

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Figures from each company's latest annual report filed with the SEC (10-K or 20-F), as reported, with the fiscal year shown. Not investment advice. How we read filings: methodology.