OITracker Cboe delayed data

Contract OI history

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Nov 20, 2026 EXPIRATION

BAX $27.50 Call

BAX261120C00027500

Latest saved OI4,442Oct 23, 2026
Last change-1vs previous saved observation
Saved market days12Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
BAX $27.50 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. 4,4432,2210 2026-10-02: 1,800 OI2026-10-05: 1,803 OI2026-10-06: 1,913 OI2026-10-07: 2,017 OI2026-10-08: 2,022 OI2026-10-09: 2,022 OI2026-10-13: 2,537 OI2026-10-14: 2,538 OI2026-10-15: 2,664 OI2026-10-16: 4,364 OI2026-10-21: 4,443 OI2026-10-23: 4,442 OI Oct 02, 2026Oct 23, 2026

All saved dates are shown. Changes compare consecutive saved observations. Missing observations are not filled with zero.

BAX contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 2026Viewing4,442-1
Oct 21, 20264,443+79
Oct 16, 20264,364+1,700
Oct 15, 20262,664+126
Oct 14, 20262,538+1
Oct 13, 20262,537+515
Oct 09, 20262,0220
Oct 08, 20262,022+5
Oct 07, 20262,017+104
Oct 06, 20261,913+110
Oct 05, 20261,803+3
Oct 02, 20261,800No prior observation