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Contract OI history

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Jan 21, 2028 EXPIRATION

BIRK $20.00 Put

BIRK280121P00020000

Latest saved OI216Oct 23, 2026
Last change+1vs previous saved observation
Saved market days12Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
BIRK $20.00 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. 2161080 2026-10-02: 216 OI2026-10-05: 216 OI2026-10-06: 216 OI2026-10-07: 216 OI2026-10-08: 216 OI2026-10-09: 216 OI2026-10-13: 215 OI2026-10-14: 215 OI2026-10-15: 215 OI2026-10-16: 215 OI2026-10-20: 215 OI2026-10-23: 216 OI Oct 02, 2026Oct 23, 2026

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

BIRK contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 2026Viewing216+1
Oct 20, 20262150
Oct 16, 20262150
Oct 15, 20262150
Oct 14, 20262150
Oct 13, 2026215-1
Oct 09, 20262160
Oct 08, 20262160
Oct 07, 20262160
Oct 06, 20262160
Oct 05, 20262160
Oct 02, 2026216No prior observation