OITracker Cboe delayed data

Contract OI history

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May 21, 2027 EXPIRATION

CIA $2.50 Put

CIA270521P00002500

Latest saved OI2,156Oct 23, 2026
Last change+2vs 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. 2,1561,0780 2026-10-02: 2,143 OI2026-10-05: 2,143 OI2026-10-06: 2,143 OI2026-10-07: 2,143 OI2026-10-08: 2,145 OI2026-10-09: 2,145 OI2026-10-13: 2,145 OI2026-10-14: 2,151 OI2026-10-16: 2,154 OI2026-10-20: 2,154 OI2026-10-23: 2,156 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, 2026Viewing2,156+2
Oct 20, 20262,1540
Oct 16, 20262,154+3
Oct 14, 20262,151+6
Oct 13, 20262,1450
Oct 09, 20262,1450
Oct 08, 20262,145+2
Oct 07, 20262,1430
Oct 06, 20262,1430
Oct 05, 20262,1430
Oct 02, 20262,143No prior observation