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Contract OI history

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Dec 18, 2026 EXPIRATION

PFE $21.00 Put

PFE261218P00021000

Latest saved OI942Oct 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
PFE $21.00 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. 9434710 2026-10-02: 942 OI2026-10-05: 942 OI2026-10-06: 937 OI2026-10-07: 936 OI2026-10-08: 936 OI2026-10-09: 935 OI2026-10-13: 938 OI2026-10-14: 938 OI2026-10-15: 943 OI2026-10-16: 937 OI2026-10-21: 938 OI2026-10-23: 942 OI Oct 02, 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, 2026Viewing942+4
Oct 21, 2026938+1
Oct 16, 2026937-6
Oct 15, 2026943+5
Oct 14, 20269380
Oct 13, 2026938+3
Oct 09, 2026935-1
Oct 08, 20269360
Oct 07, 2026936-1
Oct 06, 2026937-5
Oct 05, 20269420
Oct 02, 2026942No prior observation