What is CSTL's dilution risk score?

CSTL has a latest available DilutionScore record of 24/100, categorized as low dilution risk by the DilutionWatch scoring model. DilutionWatch displays SEC filing and dilution indicators for CSTL, including shelf registrations, ATM offerings, warrant exercises, PIPE deals, and reverse split signals when detected in source data.

What SEC filings does DilutionWatch track for CSTL?

DilutionWatch tracks 25 SEC filing types for CSTL including S-3 shelf registrations, 424B prospectuses (ATM offerings), S-1 registration statements, 8-K material events, warrant exercise notices, convertible note agreements, and Form 4 insider transactions. Alerts are delivered via email within minutes of a filing appearing on EDGAR.

How does stock dilution affect CSTL shareholders?

Stock dilution occurs when a company issues new shares, reducing the ownership percentage of existing shareholders. For CSTL, common dilution events include at-the-market (ATM) stock offerings, shelf registration drawdowns, warrant exercises, and convertible note conversions. Each event increases the share count and can pressure the stock price lower.

Is DilutionWatch free for CSTL tracking?

DilutionWatch provides a free tier that shows DilutionScores and basic filing history for CSTL. Premium plans ($19.95/month Basic, $39.95/month Premium) unlock real-time email alerts, the full Pulse™ feed, advanced dilution forecasts, and access to all 10,000+ tracked tickers.

CSTL Dilution Risk Score: 24/100 (LOW)

Score Breakdown

📋 Offering Ability

40

💰 Cash Runway

0

📊 Float Risk

10

⚠️ Warrant Exposure

40

🔄 Convertible Debt

40

Dilution Forecast

☀️

Clear

No significant dilution signals

model est. 0%

No significant dilution signals detected for CSTL.

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Market Data

Market Cap$639.36M

Shares Outstanding30.55M

Float26.76M

Cash$266.81M

Debt$10.07M

Short InterestN/A

Institutional Holdings

QoQ: ↑ 7.0% shares (2026Q1 vs prior)

190 institutional holders · 30.09M shares

#1 BlackRock, Inc. 2.98M shares

#2 RTW INVESTMENTS, LP 2.76M shares

#3 VANGUARD CAPITAL MANAGEMENT LLC 2.36M shares

+ 17 more holders Sign up free to view →

Institutional holder totals are aggregated from ownership filings and may use a different share basis or reporting date than public float. They are not a reconciliation against tradeable float.

Short Interest

Short Interest1.56M

Days to Cover3.2

% of Float5.8%

FINRA data as of Jul 31, 2026

Insider Buy/Sell Ratio

Recent SEC Activity

xbrl XBRL CONVERTIBLE 2020-12-31

Full SEC filing analysis available with free account →

Recent News

No recent news

Factual CSTL Dilution Snapshot

Castle Biosciences, Inc. (CSTL) has a DilutionScore of 24/100, rated Low dilution risk. Score date: August 28, 2026.

Recent SEC activity tracked for CSTL: xbrl on 2020-12-31.

This automatically generated snapshot is assembled from stored DilutionWatch data fields and may contain data-source errors or omissions. It is not financial advice, not investment research, and not a recommendation. Do your own research and review the full disclaimer and terms of service.