OITracker Cboe delayed data

Contract OI history

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Jan 21, 2028 EXPIRATION

CIA $2.50 Put

CIA280121P00002500

Latest saved OI3,901Oct 23, 2026
Last change0vs previous saved observation
Saved market days11Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
CIA $2.50 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. 3,9011,9500 2026-10-02: 3,251 OI2026-10-05: 3,351 OI2026-10-06: 3,701 OI2026-10-07: 3,701 OI2026-10-08: 3,701 OI2026-10-09: 3,701 OI2026-10-13: 3,701 OI2026-10-14: 3,701 OI2026-10-16: 3,701 OI2026-10-20: 3,901 OI2026-10-23: 3,901 OI Oct 02, 2026Oct 23, 2026

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

CIA contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 2026Viewing3,9010
Oct 20, 20263,901+200
Oct 16, 20263,7010
Oct 14, 20263,7010
Oct 13, 20263,7010
Oct 09, 20263,7010
Oct 08, 20263,7010
Oct 07, 20263,7010
Oct 06, 20263,701+350
Oct 05, 20263,351+100
Oct 02, 20263,251No prior observation