OITracker Cboe delayed data

Contract OI history

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Mar 19, 2027 EXPIRATION

B $40.00 Put

B270319P00040000

Latest saved OI8,821Oct 23, 2026
Last change+301vs 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. 8,8214,4100 2026-10-02: 7,421 OI2026-10-05: 7,432 OI2026-10-06: 7,432 OI2026-10-07: 8,432 OI2026-10-08: 8,433 OI2026-10-09: 8,448 OI2026-10-13: 8,469 OI2026-10-14: 8,469 OI2026-10-15: 8,469 OI2026-10-16: 8,519 OI2026-10-21: 8,520 OI2026-10-23: 8,821 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, 2026Viewing8,821+301
Oct 21, 20268,520+1
Oct 16, 20268,519+50
Oct 15, 20268,4690
Oct 14, 20268,4690
Oct 13, 20268,469+21
Oct 09, 20268,448+15
Oct 08, 20268,433+1
Oct 07, 20268,432+1,000
Oct 06, 20267,4320
Oct 05, 20267,432+11
Oct 02, 20267,421No prior observation