CSTL — Castle Biosciences Inc. price, chart and key statistics

Price data

Price

$33.15

YTD price return

-14.78%

YTD total return

-14.78%

Next earnings

Nov 5, 2026 · After close

Market cap

1B2019-09 308.9M2026-10 1B+227.9% over the window

Enterprise value

782.9M

Shares outstanding

30.5M2018-12 1.9M2026-06 30.5M+1494.3% over the window

52W low

$17.72

52W high

$44.28

From 52W high

-25.14%

From 52W low

+87.06%

52W range

58%

Volume

Rel volume

0.76×

30D volume

359.6K

30D $ vol

12.4M

Fundamentals

Sales (ttm)

357.3M2018-12 22.8M2026-06 357.3M+1468.0% over the window

Sales/share

$11.702018-12 $11.892026-06 $11.70-1.6% over the window

EPS (ttm)

-$0.652018-12 -$5.332026-06 -$0.65-87.7% over the window

FCF (ttm)

-489K2018-12 -12.6M2026-06 -489K-96.1% over the window

FCF/share

-$0.022018-12 -$6.562026-06 -$0.02-99.8% over the window

Book value/share

$15.392018-12 -$29.522026-06 $15.39-152.1% over the window

Net margin

-5.43%2018-12 -27.9%2026-06 -5.4%-80.6% over the window

ROE

-4.13%2019-09 8.6%2026-06 -4.1%-148.0% over the window

ROA

-3.46%2018-12 -28.4%2026-06 -3.5%-87.8% over the window

Debt / equity

0.02×2019-09 0.262026-06 0.02-94.2% over the window

Current ratio

6.042018-12 2.692026-06 6.04+124.4% over the window

Growth (CAGR, ttm) · 10Y

Sales

+3.18%2025-06-30 → 2026-06-30346.3M → 357.3M (+3.2% total)+28.71%2023-06-30 → 2026-06-30167.5M → 357.3M (+113.3% total)+35.55%2021-06-30 → 2026-06-3078.1M → 357.3M (+357.5% total)n/a

Shares

+5.32%2025-06-30 → 2026-06-3029M → 30.5M (+5.3% total)+4.45%2023-06-30 → 2026-06-3026.8M → 30.5M (+13.9% total)+3.95%2021-06-30 → 2026-06-3025.2M → 30.5M (+21.4% total)n/a

Per-share growth (CAGR, ttm) · 10Y

Sales/share

-2.03%2025-06-30 → 2026-06-30$11.94 → $11.70 (-2.0% total)+23.23%2023-06-30 → 2026-06-30$6.25 → $11.70 (+87.2% total)+30.40%2021-06-30 → 2026-06-30$3.10 → $11.70 (+276.9% total)n/a

Book value/share

-1.99%2025-06-30 → 2026-06-30$15.70 → $15.39 (-2.0% total)+2.88%2023-06-30 → 2026-06-30$14.13 → $15.39 (+8.9% total)-1.42%2021-06-30 → 2026-06-30$16.53 → $15.39 (-6.9% total)n/a

Price

+44.10%2025-10-20 → 2026-10-20$23.01 → $33.15 (+44.1% total)Price appreciation from split-adjusted daily closes, excluding dividends; endpoints are exact trading-day anniversaries of the latest close.+37.32%2023-10-20 → 2026-10-20$12.80 → $33.15 (+159.0% total)Price appreciation from split-adjusted daily closes, excluding dividends; endpoints are exact trading-day anniversaries of the latest close.-12.60%2021-10-20 → 2026-10-20$64.98 → $33.15 (-49.0% total)Price appreciation from split-adjusted daily closes, excluding dividends; endpoints are exact trading-day anniversaries of the latest close.n/a

Total return

+44.10%2025-10-20 → 2026-10-20$23.01 → $33.15 (+44.1% total)Total return with dividends reinvested (adjusted daily closes); endpoints are exact trading-day anniversaries of the latest close. The gap against the Price row is the dividend contribution.+37.32%2023-10-20 → 2026-10-20$12.80 → $33.15 (+159.0% total)Total return with dividends reinvested (adjusted daily closes); endpoints are exact trading-day anniversaries of the latest close. The gap against the Price row is the dividend contribution.-12.60%2021-10-20 → 2026-10-20$64.98 → $33.15 (-49.0% total)Total return with dividends reinvested (adjusted daily closes); endpoints are exact trading-day anniversaries of the latest close. The gap against the Price row is the dividend contribution.n/a

Fundamentals end at the last reported quarter; price and total return end at the latest close.

Valuation

P/E (ttm)Price ÷ TTM diluted EPS. Net income carries everything below the operating line, including one-off gains. Negative when the trailing year lost money.

-50.7×2019-09 43.562026-10 -52.16-219.7% over the window

Fwd P/E

-36.3×

P/S (ttm)Market cap ÷ TTM revenue.

2.8×2019-09 6.762026-10 2.83-58.1% over the window

P/B (mrq)Market cap ÷ stockholders' equity at the most recent quarter end.

2.2×2019-09 3.752026-10 2.15-42.6% over the window

EV/Sales (ttm)

2.2×

FCF yield (ttm)TTM free cash flow ÷ market cap — the inverse of P/FCF.

-0.05%2019-12 1.0%2026-06 -0.1%-106.5% over the window

Buyback yield (realized, 1y)1 − shares_at(2026-06-30) ÷ shares_at(2025-06-30) = 1 − 30.5M ÷ 29.0M. Point-in-time share counts from the company's own SEC filings (the same count at both ends), published only when the cash flow statement shows repurchases inside that window. A falling price can't inflate it; negative means net dilution.

-5.32%

Shareholder yield (realized, 1y)Buyback leg + dividend leg: shares retired over the year (-5.32%) + dividends paid over that year ($0) ÷ market_cap_at(2025-06-30) ($592.3M). Both legs are measured against the start of the window, so a payout can't shrink its own denominator.

-5.32%

Buyback yield (cash, ttm)Buybacks net of issuance over the trailing twelve months ($0) ÷ today's market cap ($1B). Dollars SPENT over what the company is worth NOW — a stock that fell after buying reads high.

0.00%2019-12 -11.2%2026-06 0.0%-100.0% over the window

Shareholder yield (cash, ttm)(TTM buybacks net of issuance $0 + TTM dividends $0) ÷ today's market cap ($1B). Same caveat as the cash buyback yield.

0.00%2019-12 -11.2%2026-06 0.0%-100.0% over the window

Vs own 10Y history

P/S

36th

P/B

59th

P/FCF

83rd