OITracker Cboe delayed data

Contract OI history

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May 21, 2027 EXPIRATION

U $40.00 Put

U270521P00040000

Latest saved OI2,140Oct 23, 2026
Last change-1vs previous saved observation
Saved market days11Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
U $40.00 put open interest history 11 saved observations from 2026-10-02 to 2026-10-23. Exact values and changes are listed in the table below. 2,1461,0730 2026-10-02: 1,864 OI2026-10-05: 1,862 OI2026-10-06: 2,146 OI2026-10-07: 2,146 OI2026-10-08: 2,146 OI2026-10-09: 2,146 OI2026-10-14: 2,142 OI2026-10-15: 2,142 OI2026-10-16: 2,142 OI2026-10-21: 2,141 OI2026-10-23: 2,140 OI Oct 02, 2026Oct 23, 2026

All saved dates are shown. Changes compare consecutive saved observations. Missing observations are not filled with zero.

U contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 2026Viewing2,140-1
Oct 21, 20262,141-1
Oct 16, 20262,1420
Oct 15, 20262,1420
Oct 14, 20262,142-4
Oct 09, 20262,1460
Oct 08, 20262,1460
Oct 07, 20262,1460
Oct 06, 20262,146+284
Oct 05, 20261,862-2
Oct 02, 20261,864No prior observation