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Ardelyx ARDX

US equityMarket cap rank #3373Biotechnology
$3.26 −$0.05 (-1.51%)
Market closed · Oct 8, 7:10 am ET · Last extended-hours $3.28 +0.61%
Open$3.26
Prev close$3.31
Day range$3.22 – $3.35
Volume5.39M
Market cap$841.69M
P/E (TTM)–
Dividend yield–

Average implied volatility across the listed chain right now: 243%. 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

1.003.005.007.009.00111315CallsPuts

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

-43%129%302%474%1.008.0015CallsPuts

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 $3.00 $0.33 $0.00/$0.80 0 53 88%
16 Oct 2026 $4.00 $0.05 $0.00/$0.05 10 499 126%
16 Oct 2026 $2.00 $1.26 $1.00/$1.75 7 41 334%
16 Oct 2026 $5.00 $0.00 $0.00/$0.05 0 1,090 88%
16 Oct 2026 $1.00 $3.20 $1.20/$3.10 1 18 0%
16 Oct 2026 $6.00 $0.00 $0.00/$0.05 0 5,283 121%
16 Oct 2026 $7.00 $0.00 $0.00/$0.05 0 892 149%
16 Oct 2026 $8.00 $0.00 $0.00/$0.10 0 93 172%
16 Oct 2026 $9.00 $0.00 $0.00/$0.05 0 361 192%
16 Oct 2026 $10.00 $0.00 $0.00/$0.05 0 226 210%
16 Oct 2026 $11.00 $0.00 $0.00/$0.05 0 25 226%
16 Oct 2026 $12.00 $0.00 $0.00/$0.05 0 10 240%
16 Oct 2026 $13.00 $0.00 $0.00/$0.75 0 0 254%
16 Oct 2026 $14.00 $0.00 $0.00/$0.75 0 0 266%
16 Oct 2026 $15.00 $0.00 $0.00/$0.75 0 1 277%

Puts

ExpiryStrikeLastBid/AskVolumeOpen interestIV
16 Oct 2026 $3.00 $0.02 $0.00/$0.05 0 3 50%
16 Oct 2026 $4.00 $0.69 $0.70/$0.80 0 20,391 87%
16 Oct 2026 $2.00 $0.00 $0.00/$0.55 0 21 120%
16 Oct 2026 $5.00 $1.69 $1.20/$2.35 0 113 194%
16 Oct 2026 $1.00 $0.00 $0.00/$0.55 0 2 240%
16 Oct 2026 $6.00 $2.69 $2.60/$3.40 0 148 431%
16 Oct 2026 $7.00 $3.69 $3.20/$4.40 0 92 330%
16 Oct 2026 $8.00 $4.69 $4.20/$5.40 0 127 371%
16 Oct 2026 $9.00 $5.69 $5.00/$6.50 0 5 314%
16 Oct 2026 $10.00 $6.69 $6.00/$7.50 0 0 341%
16 Oct 2026 $11.00 $7.69 $7.00/$8.50 0 1 365%
16 Oct 2026 $12.00 $8.69 $8.00/$9.50 0 0 387%
16 Oct 2026 $13.00 $9.69 $9.00/$10.50 0 0 406%
16 Oct 2026 $14.00 $10.69 $10.00/$11.50 0 0 425%
16 Oct 2026 $15.00 $11.69 $10.50/$12.90 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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