OITracker Cboe delayed data

Contract OI history

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Dec 18, 2026 EXPIRATION

B $40.00 Put

B261218P00040000

Latest saved OI5,627Oct 23, 2026
Last change+115vs 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. 5,6272,8130 2026-10-02: 4,882 OI2026-10-05: 5,412 OI2026-10-06: 5,412 OI2026-10-07: 5,474 OI2026-10-08: 5,475 OI2026-10-09: 5,455 OI2026-10-13: 5,484 OI2026-10-14: 5,492 OI2026-10-15: 5,538 OI2026-10-16: 5,539 OI2026-10-21: 5,512 OI2026-10-23: 5,627 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, 2026Viewing5,627+115
Oct 21, 20265,512-27
Oct 16, 20265,539+1
Oct 15, 20265,538+46
Oct 14, 20265,492+8
Oct 13, 20265,484+29
Oct 09, 20265,455-20
Oct 08, 20265,475+1
Oct 07, 20265,474+62
Oct 06, 20265,4120
Oct 05, 20265,412+530
Oct 02, 20264,882No prior observation