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Contract OI history

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Dec 18, 2026 EXPIRATION

BLK $1200.00 Call

BLK261218C01200000

Latest saved OI1,524Oct 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 $1200.00 call open interest history 12 saved observations from 2026-10-02 to 2026-10-23. Exact values and changes are listed in the table below. 1,5257620 2026-10-02: 987 OI2026-10-05: 993 OI2026-10-06: 993 OI2026-10-07: 997 OI2026-10-08: 996 OI2026-10-09: 998 OI2026-10-13: 1,021 OI2026-10-14: 1,021 OI2026-10-15: 1,121 OI2026-10-16: 1,123 OI2026-10-21: 1,525 OI2026-10-23: 1,524 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, 2026Viewing1,524-1
Oct 21, 20261,525+402
Oct 16, 20261,123+2
Oct 15, 20261,121+100
Oct 14, 20261,0210
Oct 13, 20261,021+23
Oct 09, 2026998+2
Oct 08, 2026996-1
Oct 07, 2026997+4
Oct 06, 20269930
Oct 05, 2026993+6
Oct 02, 2026987No prior observation