Castle Biosciences Inc. (CSTL)
CSTL trades on Nasdaq in Health Care, Medical Specialities. Numbers below come from the Nasdaq screener and SEC filings, each with its source.
Price · October 14, 2026
$32.88
+0.37% on the day
Market cap
$1.0B
Small cap
Revenue · 2025
$344.2M
+3.7% on 2024
Net income · 2025
-$24.2M
-7.0% net margin
Price, change, market cap, sector and industry: Nasdaq stock screener, as of October 14, 2026. Revenue: SEC XBRL frames, calendar 2025.
Profile
| Field | Value |
|---|---|
| Ticker | CSTL on Nasdaq |
| Sector | Health Care |
| Industry | Medical Specialities |
| Country | United States |
| IPO year | 2019 |
| SEC CIK | 0001447362 |
| SEC industry code | Services-Medical Laboratories |
| Incorporated in | DE |
Financials · 2025
| Line | Value |
|---|---|
| Revenue | $344.2M |
| Net income | -$24.2M |
| Operating income | -$42.8M |
| Net margin | -7.0% |
| Operating margin | -12.4% |
| Revenue growth | +3.7% |
| Cash | $116.7M |
| Total assets | $578.6M |
| P/E (computed) | Net income was not positive |
| P/S (computed) | 2.9× |
Key SEC documents
| Document | Form | Filed |
|---|---|---|
| Latest prospectus or offering document | S-3 | 2024-02-28 |
| Latest annual report | 10-K | 2026-02-26 |
| Latest quarterly / interim | 10-Q | 2026-07-30 |
| Latest current report | 8-K | 2026-07-30 |
| Latest proxy | DEFA14A | 2026-04-08 |
Source: SEC EDGAR submissions feed, 882 recent filings. All filings on EDGAR.
Price moves
| Window | Return |
|---|---|
| 1 week | +0.3% |
| 1 month | -6.8% |
| 3 months | +36.6% |
| Year to date | -14.9% |
| 1 year | +45.1% |
| From 52-week high | -23.1% |
Source: Yahoo Finance daily closes, last bar 2026-10-14. Computed by Sophia Capital from daily closes; cap, sector and tier from the Nasdaq screener.
Peers in Medical Specialities
| Ticker | Company | Price | Day | Market cap |
|---|---|---|---|---|
| LMRI | Lumexa Imaging Holdings Inc. | $10.61 | -0.66% | $1.0B |
| TRUP | Trupanion Inc. | $26.57 | +1.06% | $1.2B |
| FRNM | Freenome Inc. | $12.64 | -4.39% | $1.4B |
| PSNL | Personalis Inc. | $15.85 | +0.32% | $1.7B |
| ALHC | Alignment Healthcare Inc. | $8.30 | +2.60% | $1.7B |
| FLGT | Fulgent Genetics Inc. | $21.06 | -1.91% | $579.5M |
| FTRE | Fortrea Holdings Inc. | $20.92 | -0.38% | $2.0B |
| YDES | YD Bio Limited | $6.10 | -3.63% | $432.1M |
The full dossier has every filing, three years of financials, private raises and the people who signed them.
Open the full dossier