OITracker Cboe delayed data

Contract OI history

Back to B

Jan 15, 2027 EXPIRATION

B $40.00 Put

B270115P00040000

Latest saved OI6,065Oct 23, 2026
Last change+14vs 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. 6,0653,0320 2026-10-02: 5,623 OI2026-10-05: 5,629 OI2026-10-06: 5,629 OI2026-10-07: 5,633 OI2026-10-08: 5,633 OI2026-10-09: 5,633 OI2026-10-13: 5,640 OI2026-10-14: 5,639 OI2026-10-15: 6,027 OI2026-10-16: 6,035 OI2026-10-21: 6,051 OI2026-10-23: 6,065 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, 2026Viewing6,065+14
Oct 21, 20266,051+16
Oct 16, 20266,035+8
Oct 15, 20266,027+388
Oct 14, 20265,639-1
Oct 13, 20265,640+7
Oct 09, 20265,6330
Oct 08, 20265,6330
Oct 07, 20265,633+4
Oct 06, 20265,6290
Oct 05, 20265,629+6
Oct 02, 20265,623No prior observation