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Contract OI history

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Jun 17, 2027 EXPIRATION

COST $860.00 Put

COST270617P00860000

Latest saved OI420Oct 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 $860.00 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. 4232110 2026-10-09: 404 OI2026-10-13: 422 OI2026-10-14: 422 OI2026-10-15: 420 OI2026-10-16: 422 OI2026-10-21: 423 OI2026-10-23: 420 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, 2026Viewing420-3
Oct 21, 2026423+1
Oct 16, 2026422+2
Oct 15, 2026420-2
Oct 14, 20264220
Oct 13, 2026422+18
Oct 09, 2026404No prior observation