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Contract OI history

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Dec 18, 2026 EXPIRATION

COST $440.00 Put

COST261218P00440000

Latest saved OI821Oct 23, 2026
Last change0vs previous saved observation
Saved market days7Oct 09, 2026 onwards
Daily open interest Hover a point for its date and OI
COST $440.00 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. 8214100 2026-10-09: 313 OI2026-10-13: 329 OI2026-10-14: 329 OI2026-10-15: 336 OI2026-10-16: 337 OI2026-10-21: 821 OI2026-10-23: 821 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, 2026Viewing8210
Oct 21, 2026821+484
Oct 16, 2026337+1
Oct 15, 2026336+7
Oct 14, 20263290
Oct 13, 2026329+16
Oct 09, 2026313No prior observation