OITracker Cboe delayed data

Contract OI history

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Nov 20, 2026 EXPIRATION

PFE $28.50 Put

PFE261120P00028500

Latest saved OI305Oct 23, 2026
Last change+255vs previous saved observation
Saved market days2Oct 21, 2026 onwards
Daily open interest Hover a point for its date and OI
PFE $28.50 put open interest history 2 saved observations from 2026-10-21 to 2026-10-23. Exact values and changes are listed in the table below. 3051520 2026-10-21: 50 OI2026-10-23: 305 OI Oct 21, 2026Oct 23, 2026

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

PFE contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 2026Viewing305+255
Oct 21, 202650No prior observation