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Contract OI history

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Dec 18, 2026 EXPIRATION

WST $270.00 Put

WST261218P00270000

Latest saved OI514Oct 21, 2026
Last change0vs previous saved observation
Saved market days10Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
WST $270.00 put open interest history 10 saved observations from 2026-10-02 to 2026-10-21. Exact values and changes are listed in the table below. 5142570 2026-10-02: 514 OI2026-10-05: 514 OI2026-10-06: 514 OI2026-10-07: 514 OI2026-10-08: 514 OI2026-10-09: 514 OI2026-10-14: 514 OI2026-10-15: 514 OI2026-10-16: 514 OI2026-10-21: 514 OI Oct 02, 2026Oct 21, 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 21, 2026Viewing5140
Oct 16, 20265140
Oct 15, 20265140
Oct 14, 20265140
Oct 09, 20265140
Oct 08, 20265140
Oct 07, 20265140
Oct 06, 20265140
Oct 05, 20265140
Oct 02, 2026514No prior observation