OITracker Cboe delayed data

Contract OI history

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Oct 23, 2026 EXPIRATION

S $21.50 Put

S261023P00021500

Latest saved OI128Oct 23, 2026
Last change-7vs previous saved observation
Saved market days12Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
S $21.50 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. 135670 2026-10-02: 9 OI2026-10-05: 9 OI2026-10-06: 9 OI2026-10-07: 9 OI2026-10-08: 9 OI2026-10-09: 9 OI2026-10-13: 9 OI2026-10-14: 9 OI2026-10-15: 8 OI2026-10-16: 23 OI2026-10-21: 135 OI2026-10-23: 128 OI Oct 02, 2026Oct 23, 2026

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

S contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 2026Viewing128-7
Oct 21, 2026135+112
Oct 16, 202623+15
Oct 15, 20268-1
Oct 14, 202690
Oct 13, 202690
Oct 09, 202690
Oct 08, 202690
Oct 07, 202690
Oct 06, 202690
Oct 05, 202690
Oct 02, 20269No prior observation