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Contract OI history

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Nov 27, 2026 EXPIRATION

COST $640.00 Put

COST261127P00640000

Latest saved OI1,118Oct 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
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. 1,1185590 2026-10-09: 0 OI2026-10-13: 0 OI2026-10-14: 0 OI2026-10-15: 165 OI2026-10-16: 494 OI2026-10-21: 1,117 OI2026-10-23: 1,118 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, 2026Viewing1,118+1
Oct 21, 20261,117+623
Oct 16, 2026494+329
Oct 15, 2026165+165
Oct 14, 202600
Oct 13, 202600
Oct 09, 20260No prior observation