OITracker Cboe delayed data

Contract OI history

Back to B

Oct 30, 2026 EXPIRATION

B $40.00 Put

B261030P00040000

Latest saved OI279Oct 23, 2026
Last change+40vs 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. 2791390 2026-10-02: 93 OI2026-10-05: 112 OI2026-10-06: 112 OI2026-10-07: 111 OI2026-10-08: 120 OI2026-10-09: 123 OI2026-10-13: 125 OI2026-10-14: 124 OI2026-10-15: 145 OI2026-10-16: 141 OI2026-10-21: 239 OI2026-10-23: 279 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, 2026Viewing279+40
Oct 21, 2026239+98
Oct 16, 2026141-4
Oct 15, 2026145+21
Oct 14, 2026124-1
Oct 13, 2026125+2
Oct 09, 2026123+3
Oct 08, 2026120+9
Oct 07, 2026111-1
Oct 06, 20261120
Oct 05, 2026112+19
Oct 02, 202693No prior observation