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Castle Biosciences CSTL

US equityMarket cap rank #3235Diagnostics & Research
$33.00 −$0.36 (-1.08%)
Market closed · Oct 8, 7:00 am ET · Last extended-hours $33.00 0.00%
Open$33.15
Prev close$33.36
Day range$32.77 – $33.72
Volume351.5K
Market cap$1.01B
P/E (TTM)–
Dividend yield–

Average implied volatility across the listed chain right now: 218%. Implied volatility measures how big a price swing the options market is pricing in — there is no fixed “normal” level, it varies a lot by stock.

Open interest by strike

5.0010152025354550CallsPuts

Nearest listed expiry only. Calls above the line, puts below — clusters mark strikes where the market has built up the most open positions.

Implied volatility by strike

-74%222%518%814%5.002050CallsPuts

The “volatility smile”: strikes far from the current price often price in richer implied volatility than at-the-money strikes.

Calls

ExpiryStrikeLastBid/AskVolumeOpen interestIV
16 Oct 2026 $35.00 $1.43 $0.00/$1.50 0 11 111%
16 Oct 2026 $30.00 $4.16 $1.55/$5.40 0 27 79%
16 Oct 2026 $40.00 $0.45 $0.00/$0.95 0 247 116%
16 Oct 2026 $25.00 $8.54 $6.20/$10.20 0 7 126%
16 Oct 2026 $22.50 $10.99 $8.80/$12.70 0 4 173%
16 Oct 2026 $45.00 $0.14 $0.00/$1.25 0 1 122%
16 Oct 2026 $20.00 $13.48 $11.20/$15.20 0 5 206%
16 Oct 2026 $17.50 $15.98 $13.80/$17.70 0 1 265%
16 Oct 2026 $50.00 $0.04 $0.00/$2.15 0 1 127%
16 Oct 2026 $15.00 $18.48 $16.30/$20.20 0 15 321%
16 Oct 2026 $12.50 $20.97 $18.80/$22.70 0 0 388%
16 Oct 2026 $10.00 $23.47 $21.30/$25.20 0 0 470%
16 Oct 2026 $7.50 $25.97 $23.80/$27.70 0 0 579%
16 Oct 2026 $5.00 $28.47 $26.30/$30.20 0 0 740%

Puts

ExpiryStrikeLastBid/AskVolumeOpen interestIV
16 Oct 2026 $35.00 $2.94 $0.05/$4.10 0 3 33%
16 Oct 2026 $30.00 $0.67 $0.00/$2.25 0 3 94%
16 Oct 2026 $40.00 $6.98 $4.80/$8.70 0 0 0%
16 Oct 2026 $25.00 $0.05 $0.00/$2.15 0 3 97%
16 Oct 2026 $22.50 $0.01 $0.00/$2.15 0 0 98%
16 Oct 2026 $45.00 $11.70 $9.80/$13.70 0 0 0%
16 Oct 2026 $20.00 $0.00 $0.00/$1.55 0 24 99%
16 Oct 2026 $17.50 $0.00 $0.00/$2.15 0 0 112%
16 Oct 2026 $50.00 $16.64 $14.80/$18.70 0 0 0%
16 Oct 2026 $15.00 $0.00 $0.00/$2.15 0 10 139%
16 Oct 2026 $12.50 $0.00 $0.00/$2.15 0 0 170%
16 Oct 2026 $10.00 $0.00 $0.00/$2.15 0 0 207%
16 Oct 2026 $7.50 $0.00 $0.00/$2.15 0 0 256%
16 Oct 2026 $5.00 $0.00 $0.00/$0.05 0 0 326%

Open interest = contracts currently outstanding (not yet closed out). Higher open interest generally means a strike/expiry is more actively traded and easier to get in and out of.

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