OITracker Cboe delayed data

Contract OI history

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Jun 17, 2027 EXPIRATION

BLK $870.00 Put

BLK270617P00870000

Latest saved OI30Oct 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 $870.00 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. 30150 2026-10-02: 3 OI2026-10-05: 3 OI2026-10-06: 3 OI2026-10-07: 13 OI2026-10-08: 23 OI2026-10-09: 23 OI2026-10-13: 23 OI2026-10-14: 23 OI2026-10-15: 23 OI2026-10-16: 23 OI2026-10-21: 30 OI2026-10-23: 30 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, 2026Viewing300
Oct 21, 202630+7
Oct 16, 2026230
Oct 15, 2026230
Oct 14, 2026230
Oct 13, 2026230
Oct 09, 2026230
Oct 08, 202623+10
Oct 07, 202613+10
Oct 06, 202630
Oct 05, 202630
Oct 02, 20263No prior observation