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Contract OI history

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Dec 18, 2026 EXPIRATION

ISRG $400.00 Put

ISRG261218P00400000

Latest saved OI375Oct 23, 2026
Last change+24vs previous saved observation
Saved market days7Oct 09, 2026 onwards
Daily open interest Hover a point for its date and OI
ISRG $400.00 put open interest history 7 saved observations from 2026-10-09 to 2026-10-23. Exact values and changes are listed in the table below. 3751870 2026-10-09: 324 OI2026-10-13: 324 OI2026-10-14: 324 OI2026-10-15: 326 OI2026-10-16: 350 OI2026-10-21: 351 OI2026-10-23: 375 OI Oct 09, 2026Oct 23, 2026

All saved dates are shown. Changes compare consecutive saved observations. Missing observations are not filled with zero.

ISRG contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 2026Viewing375+24
Oct 21, 2026351+1
Oct 16, 2026350+24
Oct 15, 2026326+2
Oct 14, 20263240
Oct 13, 20263240
Oct 09, 2026324No prior observation