OITracker Cboe delayed data

Contract OI history

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Mar 19, 2027 EXPIRATION

BSX $35.00 Put

BSX270319P00035000

Latest saved OI4,810Oct 23, 2026
Last change-3vs previous saved observation
Saved market days12Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
BSX $35.00 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. 4,8132,4060 2026-10-02: 4,611 OI2026-10-05: 4,611 OI2026-10-06: 4,611 OI2026-10-07: 4,611 OI2026-10-08: 4,611 OI2026-10-09: 4,812 OI2026-10-13: 4,813 OI2026-10-14: 4,813 OI2026-10-15: 4,813 OI2026-10-16: 4,813 OI2026-10-21: 4,813 OI2026-10-23: 4,810 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, 2026Viewing4,810-3
Oct 21, 20264,8130
Oct 16, 20264,8130
Oct 15, 20264,8130
Oct 14, 20264,8130
Oct 13, 20264,813+1
Oct 09, 20264,812+201
Oct 08, 20264,6110
Oct 07, 20264,6110
Oct 06, 20264,6110
Oct 05, 20264,6110
Oct 02, 20264,611No prior observation