Tandem Diabetes Care Inc. options tape
These figures are updated after the US market closes, every trading day. For the live chain, go to CBOE's own page for TNDM.
Updated after the US market close on 9 October 2026, with Tandem Diabetes Care Inc. at $16.11: open interest within 90 days was 2,592 call and 1,644 put contracts, a put/call ratio of 0.63; the day's volume was 18 calls and 110 puts (6.11). The most call open interest sits at the $19.00 strike (996 contracts) and the most put open interest at $15.00 (785). The at-the-money straddle for 16 October 2026, 4 days out, was priced at 11.5% of spot. For 20 November 2026, implied volatility was 85.8% at the put 5% below spot and 115.5% at the call 5% above, -29.7 points.
Where the open interest sits
| Side | Strike | Open interest |
|---|---|---|
| Calls | $19.00 | 996 |
| Puts | $15.00 | 785 |
The strike with the most open interest on each side, across expiries within 90 days.
Source
Official exchange quotes, updated after each US market close. Figures describe positioning; they are not a forecast.
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