OITracker Cboe delayed data

Contract OI history

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Dec 18, 2026 EXPIRATION

TOST $20.00 Put

TOST261218P00020000

Latest saved OI1,704Oct 23, 2026
Last change0vs previous saved observation
Saved market days12Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
TOST $20.00 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. 1,7048520 2026-10-02: 1,684 OI2026-10-05: 1,684 OI2026-10-06: 1,684 OI2026-10-07: 1,684 OI2026-10-08: 1,684 OI2026-10-09: 1,684 OI2026-10-13: 1,684 OI2026-10-14: 1,684 OI2026-10-15: 1,704 OI2026-10-16: 1,704 OI2026-10-21: 1,704 OI2026-10-23: 1,704 OI Oct 02, 2026Oct 23, 2026

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

TOST contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 20261,7040
Oct 21, 2026Viewing1,7040
Oct 16, 20261,7040
Oct 15, 20261,704+20
Oct 14, 20261,6840
Oct 13, 20261,6840
Oct 09, 20261,6840
Oct 08, 20261,6840
Oct 07, 20261,6840
Oct 06, 20261,6840
Oct 05, 20261,6840
Oct 02, 20261,684No prior observation