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Contract OI history

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Oct 30, 2026 EXPIRATION

COST $640.00 Put

COST261030P00640000

Latest saved OI909Oct 23, 2026
Last change+20vs previous saved observation
Saved market days7Oct 09, 2026 onwards
Daily open interest Hover a point for its date and OI
COST $640.00 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. 9094540 2026-10-09: 0 OI2026-10-13: 1 OI2026-10-14: 1 OI2026-10-15: 82 OI2026-10-16: 224 OI2026-10-21: 889 OI2026-10-23: 909 OI Oct 09, 2026Oct 23, 2026

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

COST contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 2026Viewing909+20
Oct 21, 2026889+665
Oct 16, 2026224+142
Oct 15, 202682+81
Oct 14, 202610
Oct 13, 20261+1
Oct 09, 20260No prior observation