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Contract OI history

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Nov 20, 2026 EXPIRATION

BIRK $27.50 Put

BIRK261120P00027500

Latest saved OI318Oct 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
BIRK $27.50 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. 3181590 2026-10-02: 144 OI2026-10-05: 144 OI2026-10-06: 151 OI2026-10-07: 157 OI2026-10-08: 157 OI2026-10-09: 161 OI2026-10-13: 162 OI2026-10-14: 162 OI2026-10-15: 162 OI2026-10-16: 162 OI2026-10-20: 314 OI2026-10-23: 318 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, 2026Viewing318+4
Oct 20, 2026314+152
Oct 16, 20261620
Oct 15, 20261620
Oct 14, 20261620
Oct 13, 2026162+1
Oct 09, 2026161+4
Oct 08, 20261570
Oct 07, 2026157+6
Oct 06, 2026151+7
Oct 05, 20261440
Oct 02, 2026144No prior observation