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Contract OI history

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Dec 18, 2026 EXPIRATION

ISRG $420.00 Put

ISRG261218P00420000

Latest saved OI221Oct 23, 2026
Last change+76vs previous saved observation
Saved market days7Oct 09, 2026 onwards
Daily open interest Hover a point for its date and OI
ISRG $420.00 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. 2211100 2026-10-09: 134 OI2026-10-13: 136 OI2026-10-14: 136 OI2026-10-15: 136 OI2026-10-16: 136 OI2026-10-21: 145 OI2026-10-23: 221 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, 2026Viewing221+76
Oct 21, 2026145+9
Oct 16, 20261360
Oct 15, 20261360
Oct 14, 20261360
Oct 13, 2026136+2
Oct 09, 2026134No prior observation