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Contract OI history

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Sep 17, 2027 EXPIRATION

COST $880.00 Put

COST270917P00880000

Latest saved OI217Oct 23, 2026
Last change+39vs previous saved observation
Saved market days7Oct 09, 2026 onwards
Daily open interest Hover a point for its date and OI
COST $880.00 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. 2171080 2026-10-09: 134 OI2026-10-13: 135 OI2026-10-14: 135 OI2026-10-15: 134 OI2026-10-16: 141 OI2026-10-21: 178 OI2026-10-23: 217 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, 2026Viewing217+39
Oct 21, 2026178+37
Oct 16, 2026141+7
Oct 15, 2026134-1
Oct 14, 20261350
Oct 13, 2026135+1
Oct 09, 2026134No prior observation