OITracker Cboe delayed data

Contract OI history

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Jan 21, 2028 EXPIRATION

STM $40.00 Put

STM280121P00040000

Latest saved OI5,909Oct 23, 2026
Last change+3vs previous saved observation
Saved market days12Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
STM $40.00 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. 5,9092,9540 2026-10-02: 5,906 OI2026-10-05: 5,904 OI2026-10-06: 5,904 OI2026-10-07: 5,904 OI2026-10-08: 5,904 OI2026-10-09: 5,905 OI2026-10-13: 5,905 OI2026-10-14: 5,905 OI2026-10-15: 5,905 OI2026-10-16: 5,905 OI2026-10-21: 5,906 OI2026-10-23: 5,909 OI Oct 02, 2026Oct 23, 2026

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

STM contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 2026Viewing5,909+3
Oct 21, 20265,906+1
Oct 16, 20265,9050
Oct 15, 20265,9050
Oct 14, 20265,9050
Oct 13, 20265,9050
Oct 09, 20265,905+1
Oct 08, 20265,9040
Oct 07, 20265,9040
Oct 06, 20265,9040
Oct 05, 20265,904-2
Oct 02, 20265,906No prior observation