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Contract OI history

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Mar 19, 2027 EXPIRATION

COST $870.00 Put

COST270319P00870000

Latest saved OI218Oct 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 $870.00 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. 2181090 2026-10-09: 209 OI2026-10-13: 210 OI2026-10-14: 210 OI2026-10-15: 217 OI2026-10-16: 216 OI2026-10-21: 216 OI2026-10-23: 218 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, 2026Viewing218+2
Oct 21, 20262160
Oct 16, 2026216-1
Oct 15, 2026217+7
Oct 14, 20262100
Oct 13, 2026210+1
Oct 09, 2026209No prior observation