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Contract OI history

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Dec 18, 2026 EXPIRATION

ISRG $320.00 Put

ISRG261218P00320000

Latest saved OI230Oct 23, 2026
Last change0vs previous saved observation
Saved market days7Oct 09, 2026 onwards
Daily open interest Hover a point for its date and OI
ISRG $320.00 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. 2311150 2026-10-09: 230 OI2026-10-13: 231 OI2026-10-14: 231 OI2026-10-15: 231 OI2026-10-16: 229 OI2026-10-21: 230 OI2026-10-23: 230 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, 2026Viewing2300
Oct 21, 2026230+1
Oct 16, 2026229-2
Oct 15, 20262310
Oct 14, 20262310
Oct 13, 2026231+1
Oct 09, 2026230No prior observation