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Contract OI history

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Dec 18, 2026 EXPIRATION

CENX $40.00 Put

CENX261218P00040000

Latest saved OI797Oct 23, 2026
Last change+1vs previous saved observation
Saved market days7Oct 08, 2026 onwards
Daily open interest Hover a point for its date and OI
CENX $40.00 put open interest history 7 saved observations from 2026-10-08 to 2026-10-23. Exact values and changes are listed in the table below. 7973980 2026-10-08: 423 OI2026-10-09: 423 OI2026-10-13: 424 OI2026-10-14: 593 OI2026-10-16: 796 OI2026-10-21: 796 OI2026-10-23: 797 OI Oct 08, 2026Oct 23, 2026

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

CENX contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 2026Viewing797+1
Oct 21, 20267960
Oct 16, 2026796+203
Oct 14, 2026593+169
Oct 13, 2026424+1
Oct 09, 20264230
Oct 08, 2026423No prior observation