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Contract OI history

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Jan 21, 2028 EXPIRATION

COST $940.00 Put

COST280121P00940000

Latest saved OI120Oct 23, 2026
Last change0vs 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. 159790 2026-10-09: 153 OI2026-10-13: 153 OI2026-10-14: 153 OI2026-10-15: 159 OI2026-10-16: 156 OI2026-10-21: 120 OI2026-10-23: 120 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, 2026Viewing1200
Oct 21, 2026120-36
Oct 16, 2026156-3
Oct 15, 2026159+6
Oct 14, 20261530
Oct 13, 20261530
Oct 09, 2026153No prior observation