OITracker Cboe delayed data

Contract OI history

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Nov 20, 2026 EXPIRATION

BSX $55.00 Put

BSX261120P00055000

Latest saved OI1,707Oct 23, 2026
Last change-22vs previous saved observation
Saved market days12Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
BSX $55.00 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. 1,7428710 2026-10-02: 1,742 OI2026-10-05: 1,738 OI2026-10-06: 1,738 OI2026-10-07: 1,734 OI2026-10-08: 1,734 OI2026-10-09: 1,732 OI2026-10-13: 1,730 OI2026-10-14: 1,730 OI2026-10-15: 1,730 OI2026-10-16: 1,730 OI2026-10-21: 1,729 OI2026-10-23: 1,707 OI Oct 02, 2026Oct 23, 2026

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

BSX contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 2026Viewing1,707-22
Oct 21, 20261,729-1
Oct 16, 20261,7300
Oct 15, 20261,7300
Oct 14, 20261,7300
Oct 13, 20261,730-2
Oct 09, 20261,732-2
Oct 08, 20261,7340
Oct 07, 20261,734-4
Oct 06, 20261,7380
Oct 05, 20261,738-4
Oct 02, 20261,742No prior observation