OITracker Cboe delayed data

Contract OI history

Back to B

Jan 21, 2028 EXPIRATION

B $40.00 Put

B280121P00040000

Latest saved OI2,454Oct 23, 2026
Last change+504vs 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. 2,4541,2270 2026-10-02: 1,593 OI2026-10-05: 1,594 OI2026-10-06: 1,594 OI2026-10-07: 1,595 OI2026-10-08: 1,943 OI2026-10-09: 1,943 OI2026-10-13: 1,944 OI2026-10-14: 1,944 OI2026-10-15: 1,946 OI2026-10-16: 1,947 OI2026-10-21: 1,950 OI2026-10-23: 2,454 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, 2026Viewing2,454+504
Oct 21, 20261,950+3
Oct 16, 20261,947+1
Oct 15, 20261,946+2
Oct 14, 20261,9440
Oct 13, 20261,944+1
Oct 09, 20261,9430
Oct 08, 20261,943+348
Oct 07, 20261,595+1
Oct 06, 20261,5940
Oct 05, 20261,594+1
Oct 02, 20261,593No prior observation