OITracker Cboe delayed data

Contract OI history

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Dec 18, 2026 EXPIRATION

B $37.00 Put

B261218P00037000

Latest saved OI2,035Oct 23, 2026
Last change+15vs previous saved observation
Saved market days12Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
B $37.00 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. 2,0441,0220 2026-10-02: 1,252 OI2026-10-05: 1,256 OI2026-10-06: 1,256 OI2026-10-07: 1,267 OI2026-10-08: 1,268 OI2026-10-09: 1,268 OI2026-10-13: 1,267 OI2026-10-14: 1,270 OI2026-10-15: 2,044 OI2026-10-16: 2,020 OI2026-10-21: 2,020 OI2026-10-23: 2,035 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, 2026Viewing2,035+15
Oct 21, 20262,0200
Oct 16, 20262,020-24
Oct 15, 20262,044+774
Oct 14, 20261,270+3
Oct 13, 20261,267-1
Oct 09, 20261,2680
Oct 08, 20261,268+1
Oct 07, 20261,267+11
Oct 06, 20261,2560
Oct 05, 20261,256+4
Oct 02, 20261,252No prior observation