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Janux Therapeutics JANX

US equityMarket cap rank #3178Biotechnology
$17.92 +$1.13 (+6.73%)
Pre-market · Oct 8, 8:20 am ET · After hours $18.50 +3.24%
Open$16.52
Prev close$16.79
Day range$16.42 – $18.37
Volume1.21M
Market cap$1.10B
P/E (TTM)–
Dividend yield–

Average implied volatility across the listed chain right now: 203%. 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

2.507.5013182330CallsPuts

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

-70%209%488%767%2.501530CallsPuts

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 $17.50 $1.10 $0.40/$3.10 59 89 142%
16 Oct 2026 $20.00 $0.10 $0.05/$0.45 0 33 82%
16 Oct 2026 $15.00 $3.16 $2.70/$3.70 26 22 122%
16 Oct 2026 $22.50 $0.10 $0.00/$2.15 12 22 102%
16 Oct 2026 $12.50 $4.29 $3.50/$7.60 0 0 163%
16 Oct 2026 $25.00 $0.00 $0.00/$0.50 0 270 73%
16 Oct 2026 $10.00 $6.79 $6.00/$10.10 0 0 244%
16 Oct 2026 $7.50 $9.29 $8.70/$12.60 0 0 397%
16 Oct 2026 $30.00 $0.00 $0.00/$2.15 0 74 93%
16 Oct 2026 $5.00 $11.79 $10.90/$15.10 0 0 452%
16 Oct 2026 $2.50 $14.29 $13.40/$17.60 0 0 698%

Puts

ExpiryStrikeLastBid/AskVolumeOpen interestIV
16 Oct 2026 $17.50 $1.30 $0.00/$2.50 0 49 141%
16 Oct 2026 $20.00 $3.31 $0.20/$4.20 0 14 66%
16 Oct 2026 $15.00 $0.23 $0.00/$0.70 0 40 115%
16 Oct 2026 $22.50 $5.72 $2.45/$6.50 0 0 0%
16 Oct 2026 $12.50 $0.01 $0.00/$0.35 0 0 103%
16 Oct 2026 $25.00 $8.21 $4.90/$8.80 0 0 0%
16 Oct 2026 $10.00 $0.00 $0.00/$2.35 0 0 127%
16 Oct 2026 $7.50 $0.00 $0.00/$2.10 0 0 159%
16 Oct 2026 $30.00 $13.21 $9.90/$14.10 0 0 0%
16 Oct 2026 $5.00 $0.00 $0.00/$2.15 0 0 230%
16 Oct 2026 $2.50 $0.00 $0.00/$0.05 0 0 353%

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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