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Contract OI history

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Mar 19, 2027 EXPIRATION

BSX $40.00 Put

BSX270319P00040000

Latest saved OI4,431Oct 23, 2026
Last change+85vs 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. 4,4312,2150 2026-10-02: 3,848 OI2026-10-05: 3,823 OI2026-10-06: 3,846 OI2026-10-07: 3,846 OI2026-10-08: 3,846 OI2026-10-09: 3,873 OI2026-10-13: 4,248 OI2026-10-14: 4,248 OI2026-10-15: 4,248 OI2026-10-16: 4,250 OI2026-10-21: 4,346 OI2026-10-23: 4,431 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, 2026Viewing4,431+85
Oct 21, 20264,346+96
Oct 16, 20264,250+2
Oct 15, 20264,2480
Oct 14, 20264,2480
Oct 13, 20264,248+375
Oct 09, 20263,873+27
Oct 08, 20263,8460
Oct 07, 20263,8460
Oct 06, 20263,846+23
Oct 05, 20263,823-25
Oct 02, 20263,848No prior observation