OITracker Cboe delayed data

Contract OI history

Back to BLK

Jan 15, 2027 EXPIRATION

BLK $840.00 Put

BLK270115P00840000

Latest saved OI21Oct 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 $840.00 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. 21100 2026-10-02: 20 OI2026-10-05: 20 OI2026-10-06: 20 OI2026-10-07: 20 OI2026-10-08: 20 OI2026-10-09: 20 OI2026-10-13: 20 OI2026-10-14: 20 OI2026-10-15: 20 OI2026-10-16: 20 OI2026-10-21: 20 OI2026-10-23: 21 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, 2026Viewing21+1
Oct 21, 2026200
Oct 16, 2026200
Oct 15, 2026200
Oct 14, 2026200
Oct 13, 2026200
Oct 09, 2026200
Oct 08, 2026200
Oct 07, 2026200
Oct 06, 2026200
Oct 05, 2026200
Oct 02, 202620No prior observation