OITracker Cboe delayed data

Contract OI history

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May 21, 2027 EXPIRATION

M $18.00 Put

M270521P00018000

Latest saved OI70Oct 23, 2026
Last change0vs previous saved observation
Saved market days12Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
M $18.00 put open interest history 12 saved observations from 2026-10-02 to 2026-10-23. Exact values and changes are listed in the table below. 70350 2026-10-02: 0 OI2026-10-05: 0 OI2026-10-06: 0 OI2026-10-07: 20 OI2026-10-08: 20 OI2026-10-09: 20 OI2026-10-13: 20 OI2026-10-14: 20 OI2026-10-15: 20 OI2026-10-16: 21 OI2026-10-21: 70 OI2026-10-23: 70 OI Oct 02, 2026Oct 23, 2026

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

M contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 2026Viewing700
Oct 21, 202670+49
Oct 16, 202621+1
Oct 15, 2026200
Oct 14, 2026200
Oct 13, 2026200
Oct 09, 2026200
Oct 08, 2026200
Oct 07, 202620+20
Oct 06, 202600
Oct 05, 202600
Oct 02, 20260No prior observation