OITracker Cboe delayed data

Contract OI history

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Jan 15, 2027 EXPIRATION

WST $340.00 Put

WST270115P00340000

Latest saved OI14Oct 23, 2026
Last change0vs previous saved observation
Saved market days11Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
WST $340.00 put open interest history 11 saved observations from 2026-10-02 to 2026-10-23. Exact values and changes are listed in the table below. 1470 2026-10-02: 14 OI2026-10-05: 14 OI2026-10-06: 14 OI2026-10-07: 14 OI2026-10-08: 14 OI2026-10-09: 14 OI2026-10-14: 14 OI2026-10-15: 14 OI2026-10-16: 14 OI2026-10-21: 14 OI2026-10-23: 14 OI Oct 02, 2026Oct 23, 2026

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

WST contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 2026140
Oct 21, 2026Viewing140
Oct 16, 2026140
Oct 15, 2026140
Oct 14, 2026140
Oct 09, 2026140
Oct 08, 2026140
Oct 07, 2026140
Oct 06, 2026140
Oct 05, 2026140
Oct 02, 202614No prior observation