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Contract OI history

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Dec 18, 2026 EXPIRATION

WST $400.00 Call

WST261218C00400000

Latest saved OI18Oct 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 $400.00 call open interest history 11 saved observations from 2026-10-02 to 2026-10-23. Exact values and changes are listed in the table below. 23110 2026-10-02: 23 OI2026-10-05: 23 OI2026-10-06: 23 OI2026-10-07: 23 OI2026-10-08: 23 OI2026-10-09: 23 OI2026-10-14: 23 OI2026-10-15: 23 OI2026-10-16: 18 OI2026-10-21: 18 OI2026-10-23: 18 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, 2026180
Oct 21, 2026Viewing180
Oct 16, 202618-5
Oct 15, 2026230
Oct 14, 2026230
Oct 09, 2026230
Oct 08, 2026230
Oct 07, 2026230
Oct 06, 2026230
Oct 05, 2026230
Oct 02, 202623No prior observation