OITracker Cboe delayed data

Contract OI history

Back to BSX

Jan 21, 2028 EXPIRATION

BSX $40.00 Put

BSX280121P00040000

Latest saved OI4,406Oct 23, 2026
Last change-1vs 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. 4,4552,2270 2026-10-02: 4,272 OI2026-10-05: 4,273 OI2026-10-06: 4,274 OI2026-10-07: 4,277 OI2026-10-08: 4,277 OI2026-10-09: 4,399 OI2026-10-13: 4,455 OI2026-10-14: 4,455 OI2026-10-15: 4,451 OI2026-10-16: 4,445 OI2026-10-21: 4,407 OI2026-10-23: 4,406 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, 2026Viewing4,406-1
Oct 21, 20264,407-38
Oct 16, 20264,445-6
Oct 15, 20264,451-4
Oct 14, 20264,4550
Oct 13, 20264,455+56
Oct 09, 20264,399+122
Oct 08, 20264,2770
Oct 07, 20264,277+3
Oct 06, 20264,274+1
Oct 05, 20264,273+1
Oct 02, 20264,272No prior observation