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Contract OI history

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Dec 18, 2026 EXPIRATION

BSX $50.00 Put

BSX261218P00050000

Latest saved OI3,728Oct 23, 2026
Last change-13vs previous saved observation
Saved market days12Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
BSX $50.00 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. 3,7411,8700 2026-10-02: 3,733 OI2026-10-05: 3,733 OI2026-10-06: 3,734 OI2026-10-07: 3,732 OI2026-10-08: 3,732 OI2026-10-09: 3,733 OI2026-10-13: 3,729 OI2026-10-14: 3,729 OI2026-10-15: 3,731 OI2026-10-16: 3,730 OI2026-10-21: 3,741 OI2026-10-23: 3,728 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, 2026Viewing3,728-13
Oct 21, 20263,741+11
Oct 16, 20263,730-1
Oct 15, 20263,731+2
Oct 14, 20263,7290
Oct 13, 20263,729-4
Oct 09, 20263,733+1
Oct 08, 20263,7320
Oct 07, 20263,732-2
Oct 06, 20263,734+1
Oct 05, 20263,7330
Oct 02, 20263,733No prior observation