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Tandem Diabetes Care TNDM

US equityMarket cap rank #3170
$15.84 −$0.32 (-1.98%)
Pre-market · Oct 8, 7:00 am ET · After hours $15.80 -0.25%
Open$15.80
Prev close$16.16
Day range$15.73 – $16.64
Volume2.27M
Market cap$1.10B
P/E (TTM)–
Dividend yield–

Average implied volatility across the listed chain right now: 132%. 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

1013161922252831CallsPuts

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

-36%108%252%397%102031CallsPuts

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 $16.00 $0.92 $0.25/$1.60 0 78 103%
16 Oct 2026 $15.00 $1.63 $0.40/$3.40 0 14 154%
16 Oct 2026 $17.00 $0.74 $0.00/$1.25 0 24 124%
16 Oct 2026 $14.00 $2.45 $0.85/$3.70 0 0 123%
16 Oct 2026 $18.00 $0.57 $0.00/$0.45 0 21 135%
16 Oct 2026 $13.00 $3.38 $1.40/$4.70 0 0 123%
16 Oct 2026 $19.00 $0.43 $0.00/$0.70 0 13 144%
16 Oct 2026 $12.00 $4.36 $2.55/$6.10 0 0 213%
16 Oct 2026 $20.00 $0.29 $0.00/$0.75 0 3 145%
16 Oct 2026 $11.00 $5.36 $3.50/$6.90 0 0 231%
16 Oct 2026 $21.00 $0.18 $0.00/$0.75 0 1 144%
16 Oct 2026 $10.00 $6.36 $5.30/$7.90 0 0 361%
16 Oct 2026 $22.00 $0.11 $0.00/$0.75 0 19 142%
16 Oct 2026 $23.00 $0.07 $0.00/$0.75 0 0 141%
16 Oct 2026 $24.00 $0.04 $0.00/$0.75 0 0 141%

Puts

ExpiryStrikeLastBid/AskVolumeOpen interestIV
16 Oct 2026 $16.00 $0.56 $0.20/$1.65 0 113 88%
16 Oct 2026 $15.00 $0.28 $0.10/$1.00 0 135 98%
16 Oct 2026 $17.00 $1.40 $0.90/$2.05 0 39 78%
16 Oct 2026 $14.00 $0.09 $0.00/$0.75 0 0 69%
16 Oct 2026 $18.00 $2.23 $1.55/$2.90 0 0 65%
16 Oct 2026 $13.00 $0.02 $0.00/$0.75 0 0 72%
16 Oct 2026 $19.00 $3.11 $2.40/$3.80 0 1 0%
16 Oct 2026 $12.00 $0.00 $0.00/$0.75 0 0 74%
16 Oct 2026 $20.00 $3.99 $3.30/$4.70 0 22 0%
16 Oct 2026 $11.00 $0.00 $0.00/$0.75 0 0 76%
16 Oct 2026 $21.00 $4.90 $4.30/$5.70 0 0 0%
16 Oct 2026 $10.00 $0.00 $0.00/$0.75 0 0 87%
16 Oct 2026 $22.00 $5.85 $5.30/$6.90 0 0 0%
16 Oct 2026 $23.00 $6.84 $6.00/$7.90 0 0 0%
16 Oct 2026 $24.00 $7.84 $7.10/$8.80 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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