CSTL Castle Biosciences, Inc.
Platform & Compounding FCF
F 30.0 / 100 pillar composite

AlphaQuality composite grade, weighted for platform & compounding fcf businesses.

⚠ 4 of the last 5 fiscal years showed negative net income — AlphaQuality will not grade above F for persistent unprofitability in a platform & compounding fcf business.

Grade overrides the 30.0 pillar composite — hard gates always win.

Profitability

Weight: 25%
D- 30
  • 5yr Avg ROIC -5.4%
  • Operating Margin Trend +11.61 pp/yr

Capital Efficiency

Weight: 15%
F 5
  • 5yr Avg ROE -6.9%
  • 5yr Share-Count CAGR 3.6%

Growth Quality

Weight: 25%
B 72
  • 5yr Revenue CAGR 38.3%
  • 5yr EPS CAGR 0.0%
  • Revenue-Growth Years (5) 5/5

Cash Generation

Weight: 20%
D 36
  • 5yr FCF Margin -9.6%
  • 5yr FCF/NI Conversion 2.00x

Balance Sheet

Weight: 10%
B 70
  • Net Debt / EBITDA -23.15x
  • Interest Coverage (EBIT/Int) -342.19x
  • Altman Z-Score 4.82

Stability

Weight: 5%
B+ 77
  • EPS Volatility (σ/μ) 0.00
  • Piotroski F-Score 2
  • Negative-Revenue Years (5) 0/5

Guru Flow

Curated superinvestor sentiment — not part of the AlphaQuality grade.
Holding

1 of 2 gurus held; 1 added; 1 full exit.

Holders
1 -1
Avg Δ position
+32.7%
New buys
0
Full exits
1
As of Q1 2026