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Annexon ANNX

US equityMarket cap rank #3449Biotechnology
$4.01 −$0.02 (-0.50%)
Market closed · Oct 8, 7:20 am ET · Last extended-hours $4.05 +1.00%
Open$3.99
Prev close$4.03
Day range$3.91 – $4.18
Volume2.45M
Market cap$760.21M
P/E (TTM)–
Dividend yield–

Average implied volatility across the listed chain right now: 184%. 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

1.002.003.004.005.006.007.008.009.0010CallsPuts

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

-28%83%193%304%1.005.0010CallsPuts

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 $4.00 $0.25 $0.00/$0.85 2 1,338 100%
16 Oct 2026 $5.00 $0.05 $0.00/$0.35 110 2,487 124%
16 Oct 2026 $3.00 $1.08 $0.10/$2.05 0 0 174%
16 Oct 2026 $6.00 $0.02 $0.00/$0.65 0 192 159%
16 Oct 2026 $2.00 $2.03 $1.05/$3.00 0 0 248%
16 Oct 2026 $7.00 $0.00 $0.00/$0.05 0 52 158%
16 Oct 2026 $1.00 $3.03 $2.20/$3.80 0 0 0%
16 Oct 2026 $8.00 $0.00 $0.00/$2.55 0 7 160%
16 Oct 2026 $9.00 $0.00 $0.00/$2.55 0 5 162%
16 Oct 2026 $10.00 $0.00 $0.00/$0.25 0 62 172%

Puts

ExpiryStrikeLastBid/AskVolumeOpen interestIV
16 Oct 2026 $4.00 $0.36 $0.00/$0.70 0 11 153%
16 Oct 2026 $5.00 $1.07 $0.15/$1.50 0 112 0%
16 Oct 2026 $3.00 $0.04 $0.00/$0.30 0 120 155%
16 Oct 2026 $6.00 $1.99 $0.00/$4.40 0 2,480 0%
16 Oct 2026 $2.00 $0.00 $0.00/$2.55 0 0 166%
16 Oct 2026 $7.00 $2.97 $0.60/$5.50 0 2 252%
16 Oct 2026 $1.00 $0.00 $0.00/$0.05 0 0 276%
16 Oct 2026 $8.00 $3.97 $2.80/$5.20 0 0 224%
16 Oct 2026 $9.00 $4.97 $4.00/$6.00 0 0 255%
16 Oct 2026 $10.00 $5.97 $3.50/$7.80 0 0 0%

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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