OITracker Cboe delayed data

Contract OI history

Back to COST

Mar 19, 2027 EXPIRATION

COST $800.00 Put

COST270319P00800000

Latest saved OI574Oct 23, 2026
Last change+5vs previous saved observation
Saved market days7Oct 09, 2026 onwards
Daily open interest Hover a point for its date and OI
COST $800.00 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. 5742870 2026-10-09: 552 OI2026-10-13: 554 OI2026-10-14: 554 OI2026-10-15: 560 OI2026-10-16: 560 OI2026-10-21: 569 OI2026-10-23: 574 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, 2026Viewing574+5
Oct 21, 2026569+9
Oct 16, 20265600
Oct 15, 2026560+6
Oct 14, 20265540
Oct 13, 2026554+2
Oct 09, 2026552No prior observation