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Contract OI history

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Dec 18, 2026 EXPIRATION

WST $280.00 Put

WST261218P00280000

Latest saved OI83Oct 23, 2026
Last change-1vs previous saved observation
Saved market days11Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
WST $280.00 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. 84420 2026-10-02: 83 OI2026-10-05: 83 OI2026-10-06: 83 OI2026-10-07: 83 OI2026-10-08: 83 OI2026-10-09: 83 OI2026-10-14: 83 OI2026-10-15: 83 OI2026-10-16: 83 OI2026-10-21: 84 OI2026-10-23: 83 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, 202683-1
Oct 21, 2026Viewing84+1
Oct 16, 2026830
Oct 15, 2026830
Oct 14, 2026830
Oct 09, 2026830
Oct 08, 2026830
Oct 07, 2026830
Oct 06, 2026830
Oct 05, 2026830
Oct 02, 202683No prior observation