OITracker Cboe delayed data

Contract OI history

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Jan 21, 2028 EXPIRATION

STM $18.00 Put

STM280121P00018000

Latest saved OI1,309Oct 23, 2026
Last change+10vs previous saved observation
Saved market days12Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
STM $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. 1,3166580 2026-10-02: 1,316 OI2026-10-05: 1,310 OI2026-10-06: 1,310 OI2026-10-07: 1,310 OI2026-10-08: 1,310 OI2026-10-09: 1,310 OI2026-10-13: 1,310 OI2026-10-14: 1,310 OI2026-10-15: 1,310 OI2026-10-16: 1,310 OI2026-10-21: 1,299 OI2026-10-23: 1,309 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, 2026Viewing1,309+10
Oct 21, 20261,299-11
Oct 16, 20261,3100
Oct 15, 20261,3100
Oct 14, 20261,3100
Oct 13, 20261,3100
Oct 09, 20261,3100
Oct 08, 20261,3100
Oct 07, 20261,3100
Oct 06, 20261,3100
Oct 05, 20261,310-6
Oct 02, 20261,316No prior observation