OITracker Cboe delayed data

Contract OI history

Back to BLK

Oct 23, 2026 EXPIRATION

BLK $1000.00 Put

BLK261023P01000000

Latest saved OI34Oct 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
BLK $1000.00 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. 35170 2026-10-02: 14 OI2026-10-05: 15 OI2026-10-06: 15 OI2026-10-07: 14 OI2026-10-08: 14 OI2026-10-09: 13 OI2026-10-13: 14 OI2026-10-14: 14 OI2026-10-15: 35 OI2026-10-16: 35 OI2026-10-21: 35 OI2026-10-23: 34 OI Oct 02, 2026Oct 23, 2026

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

BLK contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 2026Viewing34-1
Oct 21, 2026350
Oct 16, 2026350
Oct 15, 202635+21
Oct 14, 2026140
Oct 13, 202614+1
Oct 09, 202613-1
Oct 08, 2026140
Oct 07, 202614-1
Oct 06, 2026150
Oct 05, 202615+1
Oct 02, 202614No prior observation