$CSTL
Castle Biosciences, Inc. Common Stock
XNAS•Health Care•Services-Medical Laboratories
Why is CSTL up today? It is at $34.20 (+3.86%), and our scanner flagged it 32 times on unusual volume this month. See the catalyst behind the move, real-time alerts the moment CSTL spikes, and full due diligence on CSTL — key stats, earnings, dilution and insider activity. Free.
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Key Stats
- Price
- $34.20
- Change today
- +3.86%
- Previous close
- $32.93
- 52-week range
- $17.72 – $44.28
- Market cap
- $1.04B
- Shares outstanding
- 30.5M SEC · as of 2026-07-23 · 31d
- Institutional own.
- 97.04%
- Total held
- 100.0%
- Short interest
- 1.6M ▲ +10% vs prior · as of 2026-07-31
- Days to cover
- 3.2d
- Avg daily volume
- 405K
- Sector
- Health Care
- Industry
- Services-Medical Laboratories
- Exchange
- XNAS
- 5m
- 1.1x
- 15m
- 1.2x
- 1h
- 1.3x
- 1D
- --
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Why is $CSTL up today?
Here is the latest on CSTL from our scanner (live price and day move above). We have not detected an unusual-volume catalyst for CSTL today, so it is trading in line with its recent range. The moment our scanner flags unusual activity, the reason will appear here.
Analyst data via Nasdaq. Not investment advice.
Dilution watch
UnavailableWe could not reach SEC EDGAR, so the dilution check did not run for $CSTL. This is not a clean result: there may be an offering, a registration or a shelf on file that we were unable to read. Check it yourself on SEC EDGAR before trading it.
$CSTL Sentiment
BullishBlend of news sentiment, today’s move, and community votes. Not investment advice.
$CSTL Activity
News, unusual-volume alerts, AI-trader trades and community chatter - the whole story, newest first.
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CSTL stock FAQ
Why is $CSTL up today?
Here is the latest on CSTL from our scanner (live price and day move above). We have not detected an unusual-volume catalyst for CSTL today, so it is trading in line with its recent range. The moment our scanner flags unusual activity, the reason will appear here.
What is the CSTL stock price today?
CSTL last traded at $34.20, up 3.86% on the day. The price and chart above update live during market hours (4 AM to 8 PM ET).
Where can I see live CSTL alerts?
The CSTL Live Alerts panel on this page streams real-time unusual volume (RVOL), momentum, halt and 200-EMA alerts from our scanner the moment they fire. Our scanner has flagged CSTL 32 times in the last 30 days.
What exchange is CSTL on?
CSTL (Castle Biosciences, Inc. Common Stock) trades on XNAS, with a market cap of about $1.04B in the SERVICES-MEDICAL LABORATORIES sector.
Is CSTL good for day trading?
That depends on your strategy and risk. Day traders look for volume, volatility and a clear trend. Use the live chart, RVOL alerts and 200-EMA context on this page to judge CSTL for yourself. This is not investment advice.
Live data from TheDesperateTrader scanner. Not investment advice.