OITracker Cboe delayed data

Contract OI history

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Dec 18, 2026 EXPIRATION

TOST $30.00 Put

TOST261218P00030000

Latest saved OI2,211Oct 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
TOST $30.00 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. 2,2261,1130 2026-10-02: 1,614 OI2026-10-05: 1,615 OI2026-10-06: 1,615 OI2026-10-07: 1,611 OI2026-10-08: 1,611 OI2026-10-09: 1,610 OI2026-10-13: 1,609 OI2026-10-14: 1,609 OI2026-10-15: 2,226 OI2026-10-16: 2,226 OI2026-10-21: 2,208 OI2026-10-23: 2,211 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, 2026Viewing2,211+3
Oct 21, 20262,208-18
Oct 16, 20262,2260
Oct 15, 20262,226+617
Oct 14, 20261,6090
Oct 13, 20261,609-1
Oct 09, 20261,610-1
Oct 08, 20261,6110
Oct 07, 20261,611-4
Oct 06, 20261,6150
Oct 05, 20261,615+1
Oct 02, 20261,614No prior observation