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Contract OI history

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Jan 21, 2028 EXPIRATION

ISRG $400.00 Put

ISRG280121P00400000

Latest saved OI528Oct 23, 2026
Last change+1vs 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. 5282640 2026-10-09: 522 OI2026-10-13: 522 OI2026-10-14: 522 OI2026-10-15: 522 OI2026-10-16: 528 OI2026-10-21: 527 OI2026-10-23: 528 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, 2026Viewing528+1
Oct 21, 2026527-1
Oct 16, 2026528+6
Oct 15, 20265220
Oct 14, 20265220
Oct 13, 20265220
Oct 09, 2026522No prior observation