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Contract OI history

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Jan 15, 2027 EXPIRATION

COST $840.00 Put

COST270115P00840000

Latest saved OI724Oct 23, 2026
Last change-2vs previous saved observation
Saved market days7Oct 09, 2026 onwards
Daily open interest Hover a point for its date and OI
COST $840.00 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. 7283640 2026-10-09: 720 OI2026-10-13: 723 OI2026-10-14: 723 OI2026-10-15: 728 OI2026-10-16: 728 OI2026-10-21: 726 OI2026-10-23: 724 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, 2026Viewing724-2
Oct 21, 2026726-2
Oct 16, 20267280
Oct 15, 2026728+5
Oct 14, 20267230
Oct 13, 2026723+3
Oct 09, 2026720No prior observation