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Contract OI history

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Dec 18, 2026 EXPIRATION

BSX $40.00 Put

BSX261218P00040000

Latest saved OI45,687Oct 23, 2026
Last change-480vs previous saved observation
Saved market days12Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
BSX $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. 46,20723,1030 2026-10-02: 46,207 OI2026-10-05: 46,168 OI2026-10-06: 46,181 OI2026-10-07: 46,168 OI2026-10-08: 46,168 OI2026-10-09: 46,146 OI2026-10-13: 46,135 OI2026-10-14: 46,135 OI2026-10-15: 46,126 OI2026-10-16: 46,122 OI2026-10-21: 46,167 OI2026-10-23: 45,687 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, 2026Viewing45,687-480
Oct 21, 202646,167+45
Oct 16, 202646,122-4
Oct 15, 202646,126-9
Oct 14, 202646,1350
Oct 13, 202646,135-11
Oct 09, 202646,146-22
Oct 08, 202646,1680
Oct 07, 202646,168-13
Oct 06, 202646,181+13
Oct 05, 202646,168-39
Oct 02, 202646,207No prior observation