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Contract OI history

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Sep 17, 2027 EXPIRATION

COST $940.00 Put

COST270917P00940000

Latest saved OI446Oct 23, 2026
Last change+20vs previous saved observation
Saved market days7Oct 09, 2026 onwards
Daily open interest Hover a point for its date and OI
COST $940.00 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. 4462230 2026-10-09: 374 OI2026-10-13: 389 OI2026-10-14: 389 OI2026-10-15: 389 OI2026-10-16: 389 OI2026-10-21: 426 OI2026-10-23: 446 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, 2026Viewing446+20
Oct 21, 2026426+37
Oct 16, 20263890
Oct 15, 20263890
Oct 14, 20263890
Oct 13, 2026389+15
Oct 09, 2026374No prior observation