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Contract OI history

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Oct 30, 2026 EXPIRATION

BIIB $215.00 Put

BIIB261030P00215000

Latest saved OI244Oct 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 $215.00 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. 2451220 2026-10-09: 2 OI2026-10-13: 244 OI2026-10-14: 245 OI2026-10-15: 245 OI2026-10-16: 245 OI2026-10-21: 244 OI2026-10-23: 244 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, 2026Viewing2440
Oct 21, 2026244-1
Oct 16, 20262450
Oct 15, 20262450
Oct 14, 2026245+1
Oct 13, 2026244+242
Oct 09, 20262No prior observation