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Contract OI history

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May 21, 2027 EXPIRATION

BSX $35.00 Put

BSX270521P00035000

Latest saved OI1,124Oct 23, 2026
Last change+4vs 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. 1,1245620 2026-10-02: 55 OI2026-10-05: 55 OI2026-10-06: 618 OI2026-10-07: 618 OI2026-10-08: 618 OI2026-10-09: 1,024 OI2026-10-13: 1,024 OI2026-10-14: 1,024 OI2026-10-15: 1,024 OI2026-10-16: 1,024 OI2026-10-21: 1,120 OI2026-10-23: 1,124 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, 2026Viewing1,124+4
Oct 21, 20261,120+96
Oct 16, 20261,0240
Oct 15, 20261,0240
Oct 14, 20261,0240
Oct 13, 20261,0240
Oct 09, 20261,024+406
Oct 08, 20266180
Oct 07, 20266180
Oct 06, 2026618+563
Oct 05, 2026550
Oct 02, 202655No prior observation