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Contract OI history

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Jan 21, 2028 EXPIRATION

WES $40.00 Put

WES280121P00040000

Latest saved OI366Oct 23, 2026
Last change+20vs 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. 4162080 2026-10-02: 416 OI2026-10-05: 416 OI2026-10-06: 416 OI2026-10-07: 416 OI2026-10-08: 416 OI2026-10-09: 416 OI2026-10-13: 346 OI2026-10-14: 346 OI2026-10-16: 346 OI2026-10-20: 346 OI2026-10-23: 366 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, 2026Viewing366+20
Oct 20, 20263460
Oct 16, 20263460
Oct 14, 20263460
Oct 13, 2026346-70
Oct 09, 20264160
Oct 08, 20264160
Oct 07, 20264160
Oct 06, 20264160
Oct 05, 20264160
Oct 02, 2026416No prior observation