Is CSTL or BDSX the better stock?

"Better" depends on your goal, and these two are not alike. CSTL is the larger company by market cap ($1.04B vs $281M). CSTL has been more active on our scanner (32 vs 18 alerts in 30 days). BDSX has the smaller float (8.1M vs 28.6M), which tends to mean sharper, more volatile moves. Those are the measured differences, not a recommendation, and nothing here is investment advice.

What is the difference between CSTL and BDSX?

The differences that matter: CSTL is roughly 4x the size of the other by market cap ($1.04B vs $281M); they trade at very different share prices ($34.20 vs $26.63); CSTL sits at 62% of its 52-week range against 98% for BDSX; our scanner flagged CSTL 32 times in the last 30 days against 18 for BDSX. Everything above is measured from the latest completed session and SEC filings.

Which of CSTL and BDSX is more active right now?

Right now CSTL is at about 1.3x its normal volume and BDSX is at about 3.2x, so BDSX is the one drawing unusual attention today. Relative volume (RVOL) compares a stock's volume to its own recent average, so it reads the same way for a megacap and a microcap and is the quickest way to tell which of two similar names is actually in play.

Is this comparison data live?

Prices and % changes are anchored to the latest completed session and split-adjusted, so a reverse split never shows as a fake move. Float is estimated from SEC filings and refreshed as new filings publish.

Compare

CSTL vs BDSX

TheDesperateTrader.com· Side-by-side stock comparison

$CSTL vs $BDSX head to head: price, market cap, valuation, dividend, free float, relative volume and how actively each trades. The bigger value in the size rows is bolded. Tap either ticker for its live chart, full ownership breakdown and real-time alerts.

$CSTLCastle Biosciences, Inc. Common Stock

$BDSXBiodesix, Inc. Common Stock

$34.20

Price

$26.63

+0.0%

Day change

+0.0%

$1.04B

Market cap

$281M

—

P/E ratio

—

Dividend yield

—

28.6M

Free float

8.1M

97.04%

Institutional

43.23%

431K

Avg volume

86K

1.3x

Rel. volume

3.2x

62% of 52w

52-week range

98% of 52w

Scanner alerts 30d

SERVICES-MEDICAL LABORATORIES

Sector

SERVICES-MEDICAL LABORATORIES

CSTL vs BDSX: the quick read

·CSTL is the larger company by market cap ($1.04B vs $281M).
·CSTL has been more active on our scanner (32 vs 18 alerts in 30 days).
·BDSX has the smaller float (8.1M vs 28.6M), which tends to mean sharper, more volatile moves.
·Both are services-medical laboratories names, so this is a like-for-like comparison and sector news tends to move them together.
·Both stay busy on our scanner, 32 and 18 unusual-volume alerts over 30 days, so neither is the quiet one here.
·BDSX is the one in play today, trading about 3.2x its normal volume, which is what puts a name on our scanner in the first place.

Objective differences only. Not investment advice.

$CSTL full page →$BDSX full page →Add more tickers

Get the best catches in your inbox

Free daily email of the top plays and unusual-volume alerts our scanner flags. No account needed.

No spam. Unsubscribe anytime. Not investment advice.

Frequently asked questions

Everything you need to know comparing CSTL and BDSX on TheDesperateTrader.

Is CSTL or BDSX the better stock?: "Better" depends on your goal, and these two are not alike. CSTL is the larger company by market cap ($1.04B vs $281M). CSTL has been more active on our scanner (32 vs 18 alerts in 30 days). BDSX has the smaller float (8.1M vs 28.6M), which tends to mean sharper, more volatile moves. Those are the measured differences, not a recommendation, and nothing here is investment advice.
What is the difference between CSTL and BDSX?: The differences that matter: CSTL is roughly 4x the size of the other by market cap ($1.04B vs $281M); they trade at very different share prices ($34.20 vs $26.63); CSTL sits at 62% of its 52-week range against 98% for BDSX; our scanner flagged CSTL 32 times in the last 30 days against 18 for BDSX. Everything above is measured from the latest completed session and SEC filings.
Which of CSTL and BDSX is more active right now?: Right now CSTL is at about 1.3x its normal volume and BDSX is at about 3.2x, so BDSX is the one drawing unusual attention today. Relative volume (RVOL) compares a stock's volume to its own recent average, so it reads the same way for a megacap and a microcap and is the quickest way to tell which of two similar names is actually in play.
Is this comparison data live?: Prices and % changes are anchored to the latest completed session and split-adjusted, so a reverse split never shows as a fake move. Float is estimated from SEC filings and refreshed as new filings publish.

Trading CSTL or BDSX? Get real-time unusual-volume alerts the moment either one moves, free.

No card · 5 premium days

Explore the market

Free, live market tools. No account required to look.

Site GuideEvery page explained, and how to trade with it Top Stocks TodaySix ranked stocks, live charts, why each one Due DiligenceDeep dives on one ticker, traced to SEC filings and the tape Super PortfolioEvery big holding from 13F filings and corporate stakes Free Stock ScannersEvery scanner in one place Caught EarlyWhat our scanner flagged before it ran How It WorksOur data, methodology & accuracy Trading CalculatorsPosition size, profit & average down Trading Taxes ExplainedWash sales, trader status and what you owe Stock Market TodayWhat’s actually moving right now Low Float MoversWho traded their whole float today Betting AgainstWho the market is short, and which funds hold puts Our Call RecordEvery name we posted and what it did next, losers included Stocks to WatchTop 10 to watch next session, with reasons Trending StocksWhat’s moving & being searched now Stock Sectors & ThemesAI, crypto, energy, banks & 40 more Biggest Gainers TodayTop gainers & most active Why Stocks Are MovingToday’s movers + the catalyst behind each Insider BuyingStocks insiders are buying (Form 4)Biggest Losers TodayTop decliners & worst performers Premarket MoversTop gainers & losers before the bell Gap ScannerBiggest gap ups & downs. Did it fill?After Hours MoversTop gainers & losers after the close Most Active StocksHighest dollar-volume names 52-Week Highs & LowsStocks making new highs & lows Stock SplitsUpcoming & recent, and what happened after Oversold StocksLowest RSI, mean-reversion watch Low Float StocksSmallest floats, squeeze watch Most Volatile StocksBiggest daily range by ATR%Most Shorted StocksHighest short % of float Short Squeeze StocksTop squeeze candidates by score Penny StocksMost active under $5 Stocks Under $1Most active sub-$1 names Stocks Under $10Most active under $10 Overbought StocksHighest RSI, extended / pullback watch Weekly MoversBiggest gainers & losers this week Stock ScreenerScan by price, volume & RVOL The Money MapMarket cap added or wiped, by sector Sector PerformanceBest & worst sectors today Store ClosuresRetail & restaurant stocks under pressure Earnings CalendarWho reports before open & after close Earnings Next WeekThe week ahead, biggest names by day Moving After EarningsBiggest post-earnings gainers & losers Economic CalendarFOMC, CPI, jobs & market-moving data Dividend CalendarEx-dates, yields & buy-by dates IPO CalendarRecent & upcoming stock listings Daily RecapHow each session played out RVOL ScannerLive unusual-volume alerts Halt ScannerLive trading halts & resumes Stock Halts TodayHalted stocks + reasons & resumes Live AlertsThe real-time scanner feed Smart MoneyInsider buys, 5% stakes & 13F Reddit RadarTrending tickers & top posts Google Search RadarStocks America is Googling now Market CalendarEconomic, earnings & dividends in one Crypto PricesLive Bitcoin, Ethereum & top coins Currency ConverterExchange rates: EUR, GBP, JPY & more Mortgage RatesCurrent 30-year & 15-year rates AI StocksThe AI buildout: chips, cloud & software Semiconductor StocksChipmakers & equipment, and why they move