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Contract OI history

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Dec 18, 2026 EXPIRATION

BLK $1000.00 Put

BLK261218P01000000

Latest saved OI207Oct 23, 2026
Last change+5vs 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. 2071030 2026-10-02: 190 OI2026-10-05: 190 OI2026-10-06: 190 OI2026-10-07: 190 OI2026-10-08: 190 OI2026-10-09: 190 OI2026-10-13: 195 OI2026-10-14: 195 OI2026-10-15: 196 OI2026-10-16: 197 OI2026-10-21: 202 OI2026-10-23: 207 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, 2026Viewing207+5
Oct 21, 2026202+5
Oct 16, 2026197+1
Oct 15, 2026196+1
Oct 14, 20261950
Oct 13, 2026195+5
Oct 09, 20261900
Oct 08, 20261900
Oct 07, 20261900
Oct 06, 20261900
Oct 05, 20261900
Oct 02, 2026190No prior observation