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Contract OI history

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Jan 21, 2028 EXPIRATION

BIIB $220.00 Put

BIIB280121P00220000

Latest saved OI271Oct 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 $220.00 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. 2711350 2026-10-09: 269 OI2026-10-13: 269 OI2026-10-14: 271 OI2026-10-15: 271 OI2026-10-16: 271 OI2026-10-21: 271 OI2026-10-23: 271 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, 2026Viewing2710
Oct 21, 20262710
Oct 16, 20262710
Oct 15, 20262710
Oct 14, 2026271+2
Oct 13, 20262690
Oct 09, 2026269No prior observation