OITracker Cboe delayed data

Contract OI history

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Dec 18, 2026 EXPIRATION

STEP $50.00 Call

STEP261218C00050000

Latest saved OI139Oct 23, 2026
Last change0vs previous saved observation
Saved market days6Oct 09, 2026 onwards
Daily open interest Hover a point for its date and OI
STEP $50.00 call open interest history 6 saved observations from 2026-10-09 to 2026-10-23. Exact values and changes are listed in the table below. 139690 2026-10-09: 132 OI2026-10-13: 132 OI2026-10-14: 134 OI2026-10-16: 134 OI2026-10-20: 139 OI2026-10-23: 139 OI Oct 09, 2026Oct 23, 2026

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

STEP contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 20261390
Oct 20, 2026Viewing139+5
Oct 16, 20261340
Oct 14, 2026134+2
Oct 13, 20261320
Oct 09, 2026132No prior observation