OITracker Cboe delayed data

Contract OI history

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Nov 20, 2026 EXPIRATION

REF $17.50 Call

REF261120C00017500

Latest saved OI1,051Oct 23, 2026
Last change0vs previous saved observation
Saved market days11Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
REF $17.50 call open interest history 11 saved observations from 2026-10-02 to 2026-10-23. Exact values and changes are listed in the table below. 1,0515250 2026-10-02: 1,051 OI2026-10-05: 1,051 OI2026-10-06: 1,051 OI2026-10-07: 1,051 OI2026-10-08: 1,051 OI2026-10-09: 1,051 OI2026-10-13: 1,051 OI2026-10-14: 1,051 OI2026-10-16: 1,051 OI2026-10-20: 1,051 OI2026-10-23: 1,051 OI Oct 02, 2026Oct 23, 2026

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

REF contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 20261,0510
Oct 20, 2026Viewing1,0510
Oct 16, 20261,0510
Oct 14, 20261,0510
Oct 13, 20261,0510
Oct 09, 20261,0510
Oct 08, 20261,0510
Oct 07, 20261,0510
Oct 06, 20261,0510
Oct 05, 20261,0510
Oct 02, 20261,051No prior observation