OITracker Cboe delayed data

Contract OI history

Back to B

Jun 17, 2027 EXPIRATION

B $40.00 Put

B270617P00040000

Latest saved OI8,085Oct 23, 2026
Last change+43vs previous saved observation
Saved market days12Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
B $40.00 put open interest history 12 saved observations from 2026-10-02 to 2026-10-23. Exact values and changes are listed in the table below. 8,0854,0420 2026-10-02: 7,665 OI2026-10-05: 7,665 OI2026-10-06: 7,665 OI2026-10-07: 7,665 OI2026-10-08: 7,665 OI2026-10-09: 7,678 OI2026-10-13: 8,031 OI2026-10-14: 8,036 OI2026-10-15: 8,037 OI2026-10-16: 8,037 OI2026-10-21: 8,042 OI2026-10-23: 8,085 OI Oct 02, 2026Oct 23, 2026

All saved dates are shown. Changes compare consecutive saved observations. Missing observations are not filled with zero.

B contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 2026Viewing8,085+43
Oct 21, 20268,042+5
Oct 16, 20268,0370
Oct 15, 20268,037+1
Oct 14, 20268,036+5
Oct 13, 20268,031+353
Oct 09, 20267,678+13
Oct 08, 20267,6650
Oct 07, 20267,6650
Oct 06, 20267,6650
Oct 05, 20267,6650
Oct 02, 20267,665No prior observation