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Contract OI history

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Nov 20, 2026 EXPIRATION

WST $350.00 Put

WST261120P00350000

Latest saved OI22Oct 23, 2026
Last change+3vs previous saved observation
Saved market days11Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
WST $350.00 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. 22110 2026-10-02: 4 OI2026-10-05: 6 OI2026-10-06: 6 OI2026-10-07: 6 OI2026-10-08: 6 OI2026-10-09: 6 OI2026-10-14: 6 OI2026-10-15: 6 OI2026-10-16: 6 OI2026-10-21: 19 OI2026-10-23: 22 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, 202622+3
Oct 21, 2026Viewing19+13
Oct 16, 202660
Oct 15, 202660
Oct 14, 202660
Oct 09, 202660
Oct 08, 202660
Oct 07, 202660
Oct 06, 202660
Oct 05, 20266+2
Oct 02, 20264No prior observation