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Phathom Pharmaceuticals PHAT

US equityMarket cap rank #3679Biotechnology
$6.81 +$0.03 (+0.44%)
Pre-market · Oct 8, 7:20 am ET · After hours $6.80 -0.15%
Open$6.87
Prev close$6.78
Day range$6.60 – $7.03
Volume1.63M
Market cap$550.94M
P/E (TTM)–
Dividend yield–

Average implied volatility across the listed chain right now: 223%. 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

2.505.007.5010131518CallsPuts

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

-41%122%284%446%2.501018CallsPuts

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 $7.50 $0.27 $0.00/$4.90 0 9 127%
16 Oct 2026 $5.00 $1.83 $0.10/$4.90 0 1 405%
16 Oct 2026 $10.00 $0.01 $0.00/$1.95 0 94 121%
16 Oct 2026 $2.50 $4.28 $2.00/$6.50 0 0 0%
16 Oct 2026 $12.50 $0.00 $0.00/$4.90 0 17 132%
16 Oct 2026 $15.00 $0.00 $0.00/$4.90 0 0 146%
16 Oct 2026 $17.50 $0.00 $0.00/$4.90 0 0 172%

Puts

ExpiryStrikeLastBid/AskVolumeOpen interestIV
16 Oct 2026 $7.50 $0.98 $0.15/$4.00 0 49 403%
16 Oct 2026 $5.00 $0.04 $0.00/$0.05 0 37 141%
16 Oct 2026 $10.00 $3.22 $1.00/$5.50 0 9 172%
16 Oct 2026 $2.50 $0.00 $0.00/$4.90 0 0 224%
16 Oct 2026 $12.50 $5.72 $3.50/$7.80 0 1 0%
16 Oct 2026 $15.00 $8.22 $6.00/$10.50 0 0 296%
16 Oct 2026 $17.50 $10.72 $8.50/$13.00 0 0 340%

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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