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Contract OI history

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Nov 20, 2026 EXPIRATION

WES $40.00 Put

WES261120P00040000

Latest saved OI192Oct 23, 2026
Last change+10vs previous saved observation
Saved market days11Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
WES $40.00 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. 192960 2026-10-02: 182 OI2026-10-05: 182 OI2026-10-06: 182 OI2026-10-07: 182 OI2026-10-08: 149 OI2026-10-09: 149 OI2026-10-13: 149 OI2026-10-14: 149 OI2026-10-16: 149 OI2026-10-20: 182 OI2026-10-23: 192 OI Oct 02, 2026Oct 23, 2026

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

WES contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 2026Viewing192+10
Oct 20, 2026182+33
Oct 16, 20261490
Oct 14, 20261490
Oct 13, 20261490
Oct 09, 20261490
Oct 08, 2026149-33
Oct 07, 20261820
Oct 06, 20261820
Oct 05, 20261820
Oct 02, 2026182No prior observation