OITracker Cboe delayed data

Contract OI history

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Mar 19, 2027 EXPIRATION

B $40.00 Call

B270319C00040000

Latest saved OI1,201Oct 23, 2026
Last change+30vs previous saved observation
Saved market days12Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
B $40.00 call open interest history 12 saved observations from 2026-10-02 to 2026-10-23. Exact values and changes are listed in the table below. 1,2016000 2026-10-02: 571 OI2026-10-05: 572 OI2026-10-06: 572 OI2026-10-07: 576 OI2026-10-08: 580 OI2026-10-09: 581 OI2026-10-13: 1,168 OI2026-10-14: 1,168 OI2026-10-15: 1,170 OI2026-10-16: 1,171 OI2026-10-21: 1,171 OI2026-10-23: 1,201 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, 2026Viewing1,201+30
Oct 21, 20261,1710
Oct 16, 20261,171+1
Oct 15, 20261,170+2
Oct 14, 20261,1680
Oct 13, 20261,168+587
Oct 09, 2026581+1
Oct 08, 2026580+4
Oct 07, 2026576+4
Oct 06, 20265720
Oct 05, 2026572+1
Oct 02, 2026571No prior observation