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Contract OI history

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Dec 18, 2026 EXPIRATION

BIIB $230.00 Put

BIIB261218P00230000

Latest saved OI1,331Oct 23, 2026
Last change0vs previous saved observation
Saved market days7Oct 09, 2026 onwards
Daily open interest Hover a point for its date and OI
BIIB $230.00 put open interest history 7 saved observations from 2026-10-09 to 2026-10-23. Exact values and changes are listed in the table below. 1,3316650 2026-10-09: 211 OI2026-10-13: 331 OI2026-10-14: 331 OI2026-10-15: 331 OI2026-10-16: 826 OI2026-10-21: 1,331 OI2026-10-23: 1,331 OI Oct 09, 2026Oct 23, 2026

All saved dates are shown. Changes compare consecutive saved observations. Missing observations are not filled with zero.

BIIB contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 2026Viewing1,3310
Oct 21, 20261,331+505
Oct 16, 2026826+495
Oct 15, 20263310
Oct 14, 20263310
Oct 13, 2026331+120
Oct 09, 2026211No prior observation