ISRG options flow
From the October 21, 2026 session tape · published after the close
ISRG options traded $6.3M in premium across 507 prints on October 21, 2026: 54% in calls and 46% in puts, with 0% in contracts expiring that day. That was 171% of its average session over the prior 19.
ISRG largest options trades, October 21, 2026
| Time | Contract | Size | Price | Premium |
|---|---|---|---|---|
| 10:28 | 425P Oct 23 | 233 | $11.00 | $256K |
| 10:28 | 422.5P Oct 23 | 253 | $9.80 | $248K |
| 12:41 | 435P Nov 20 | 104 | $17.65 | $184K |
| 12:42 | 435P Nov 13 | 103 | $16.56 | $171K |
| 14:31 | 435C Oct 23 | 502 | $3.37 | $169K |
| 10:05 | 425P Oct 23 | 229 | $6.70 | $153K |
| 15:45 | 430C Nov 13 | 95 | $12.30 | $117K |
| 10:28 | 430C Nov 6 | 124 | $9.22 | $114K |
| 15:45 | 430P Nov 13 | 72 | $15.60 | $112K |
| 10:27 | 395P Nov 27 | 139 | $7.66 | $106K |
| 15:45 | 435C Nov 13 | 93 | $10.20 | $95K |
| 10:28 | 395P Nov 20 | 139 | $6.65 | $92K |
| 10:04 | 405C Oct 23 | 50 | $17.70 | $89K |
| 15:44 | 420P Dec 18 | 50 | $17.50 | $88K |
| 10:28 | 440C Nov 6 | 134 | $6.27 | $84K |
The largest single ISRG print was a 425 put expiring Oct 23 for $256K at 10:28 ET.
The busiest strikes by premium were 430 calls ($513K), 440 calls ($490K), 435 calls ($489K), 435 puts ($473K).
Last 20 sessions of ISRG premium, calls vs puts: Oct 15 $2.6M (79% calls) · Oct 16 $6.0M (89% calls) · Oct 19 $8.0M (62% calls) · Oct 20 $9.7M (51% calls) · Oct 21 $6.3M (54% calls).
A large print is a trade, not a verdict: it can be a hedge, a close, or one leg of a spread. Read it next to where dealers are positioned, on the other ISRG pages.
These are the October 20, 2026 closing numbers. Members see ISRG's map move live all session.
Common questions
$6.3M in premium across 507 prints, 54% calls. The largest print was a 425 put for $256K.
54% of premium was in calls. Premium alone does not show direction: buyers and sellers, hedges and spreads all print the same way.
No. This page shows the last completed session, published after the close. Members see the flow as it prints.
Compare: options flow on other tickers
Measured from the closing options book and rebuilt after every close. Nothing on this page is live. Levels are where dealer hedging is concentrated, not targets or forecasts. Not investment advice.