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Contract OI history

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Dec 18, 2026 EXPIRATION

COST $850.00 Put

COST261218P00850000

Latest saved OI623Oct 23, 2026
Last change-3vs previous saved observation
Saved market days7Oct 09, 2026 onwards
Daily open interest Hover a point for its date and OI
COST $850.00 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. 7023510 2026-10-09: 335 OI2026-10-13: 702 OI2026-10-14: 702 OI2026-10-15: 684 OI2026-10-16: 691 OI2026-10-21: 626 OI2026-10-23: 623 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, 2026Viewing623-3
Oct 21, 2026626-65
Oct 16, 2026691+7
Oct 15, 2026684-18
Oct 14, 20267020
Oct 13, 2026702+367
Oct 09, 2026335No prior observation