OITracker Cboe delayed data

Contract OI history

Back to GRBK

Nov 20, 2026 EXPIRATION

GRBK $55.00 Put

GRBK261120P00055000

Latest saved OI45Oct 21, 2026
Last change+3vs previous saved observation
Saved market days10Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
GRBK $55.00 put open interest history 10 saved observations from 2026-10-02 to 2026-10-21. Exact values and changes are listed in the table below. 45220 2026-10-02: 35 OI2026-10-05: 35 OI2026-10-06: 35 OI2026-10-07: 35 OI2026-10-08: 35 OI2026-10-09: 35 OI2026-10-13: 38 OI2026-10-14: 38 OI2026-10-16: 42 OI2026-10-21: 45 OI Oct 02, 2026Oct 21, 2026

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

GRBK contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 21, 2026Viewing45+3
Oct 16, 202642+4
Oct 14, 2026380
Oct 13, 202638+3
Oct 09, 2026350
Oct 08, 2026350
Oct 07, 2026350
Oct 06, 2026350
Oct 05, 2026350
Oct 02, 202635No prior observation