OITracker Cboe delayed data

Contract OI history

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Dec 18, 2026 EXPIRATION

BSX $40.00 Call

BSX261218C00040000

Latest saved OI291Oct 23, 2026
Last change-5vs previous saved observation
Saved market days12Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
BSX $40.00 call open interest history 12 saved observations from 2026-10-02 to 2026-10-23. Exact values and changes are listed in the table below. 3021510 2026-10-02: 300 OI2026-10-05: 300 OI2026-10-06: 302 OI2026-10-07: 283 OI2026-10-08: 283 OI2026-10-09: 284 OI2026-10-13: 283 OI2026-10-14: 283 OI2026-10-15: 274 OI2026-10-16: 284 OI2026-10-21: 296 OI2026-10-23: 291 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, 2026Viewing291-5
Oct 21, 2026296+12
Oct 16, 2026284+10
Oct 15, 2026274-9
Oct 14, 20262830
Oct 13, 2026283-1
Oct 09, 2026284+1
Oct 08, 20262830
Oct 07, 2026283-19
Oct 06, 2026302+2
Oct 05, 20263000
Oct 02, 2026300No prior observation