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Contract OI history

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Dec 18, 2026 EXPIRATION

BSX $42.50 Put

BSX261218P00042500

Latest saved OI6,191Oct 23, 2026
Last change+25vs previous saved observation
Saved market days12Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
BSX $42.50 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. 6,1913,0950 2026-10-02: 4,300 OI2026-10-05: 4,298 OI2026-10-06: 4,314 OI2026-10-07: 4,322 OI2026-10-08: 4,322 OI2026-10-09: 4,340 OI2026-10-13: 6,128 OI2026-10-14: 6,128 OI2026-10-15: 6,128 OI2026-10-16: 6,132 OI2026-10-21: 6,166 OI2026-10-23: 6,191 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, 2026Viewing6,191+25
Oct 21, 20266,166+34
Oct 16, 20266,132+4
Oct 15, 20266,1280
Oct 14, 20266,1280
Oct 13, 20266,128+1,788
Oct 09, 20264,340+18
Oct 08, 20264,3220
Oct 07, 20264,322+8
Oct 06, 20264,314+16
Oct 05, 20264,298-2
Oct 02, 20264,300No prior observation