OITracker Cboe delayed data

Contract OI history

Back to BLK

Jan 21, 2028 EXPIRATION

BLK $900.00 Put

BLK280121P00900000

Latest saved OI108Oct 23, 2026
Last change0vs previous saved observation
Saved market days12Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
BLK $900.00 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. 108540 2026-10-02: 108 OI2026-10-05: 108 OI2026-10-06: 108 OI2026-10-07: 108 OI2026-10-08: 108 OI2026-10-09: 108 OI2026-10-13: 108 OI2026-10-14: 108 OI2026-10-15: 108 OI2026-10-16: 108 OI2026-10-21: 108 OI2026-10-23: 108 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, 2026Viewing1080
Oct 21, 20261080
Oct 16, 20261080
Oct 15, 20261080
Oct 14, 20261080
Oct 13, 20261080
Oct 09, 20261080
Oct 08, 20261080
Oct 07, 20261080
Oct 06, 20261080
Oct 05, 20261080
Oct 02, 2026108No prior observation