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Contract OI history

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Dec 18, 2026 EXPIRATION

BSX $37.50 Put

BSX261218P00037500

Latest saved OI5,575Oct 23, 2026
Last change+111vs previous saved observation
Saved market days12Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
BSX $37.50 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. 5,5752,7870 2026-10-02: 5,307 OI2026-10-05: 5,314 OI2026-10-06: 5,353 OI2026-10-07: 5,357 OI2026-10-08: 5,357 OI2026-10-09: 5,363 OI2026-10-13: 5,413 OI2026-10-14: 5,413 OI2026-10-15: 5,432 OI2026-10-16: 5,438 OI2026-10-21: 5,464 OI2026-10-23: 5,575 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, 2026Viewing5,575+111
Oct 21, 20265,464+26
Oct 16, 20265,438+6
Oct 15, 20265,432+19
Oct 14, 20265,4130
Oct 13, 20265,413+50
Oct 09, 20265,363+6
Oct 08, 20265,3570
Oct 07, 20265,357+4
Oct 06, 20265,353+39
Oct 05, 20265,314+7
Oct 02, 20265,307No prior observation