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Contract OI history

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Dec 15, 2028 EXPIRATION

COST $900.00 Put

COST281215P00900000

Latest saved OI329Oct 23, 2026
Last change+5vs previous saved observation
Saved market days7Oct 09, 2026 onwards
Daily open interest Hover a point for its date and OI
COST $900.00 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. 3391690 2026-10-09: 339 OI2026-10-13: 339 OI2026-10-14: 339 OI2026-10-15: 323 OI2026-10-16: 324 OI2026-10-21: 324 OI2026-10-23: 329 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, 2026Viewing329+5
Oct 21, 20263240
Oct 16, 2026324+1
Oct 15, 2026323-16
Oct 14, 20263390
Oct 13, 20263390
Oct 09, 2026339No prior observation