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Contract OI history

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Jan 21, 2028 EXPIRATION

COST $900.00 Put

COST280121P00900000

Latest saved OI698Oct 23, 2026
Last change+1vs previous saved observation
Saved market days7Oct 09, 2026 onwards
Daily open interest Hover a point for its date and OI
COST $900.00 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. 6983490 2026-10-09: 684 OI2026-10-13: 684 OI2026-10-14: 684 OI2026-10-15: 683 OI2026-10-16: 695 OI2026-10-21: 697 OI2026-10-23: 698 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, 2026Viewing698+1
Oct 21, 2026697+2
Oct 16, 2026695+12
Oct 15, 2026683-1
Oct 14, 20266840
Oct 13, 20266840
Oct 09, 2026684No prior observation