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Contract OI history

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Jan 21, 2028 EXPIRATION

FOUR $40.00 Put

FOUR280121P00040000

Latest saved OI419Oct 23, 2026
Last change+80vs previous saved observation
Saved market days12Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
FOUR $40.00 put open interest history 12 saved observations from 2026-10-02 to 2026-10-23. Exact values and changes are listed in the table below. 4192090 2026-10-02: 301 OI2026-10-05: 301 OI2026-10-06: 303 OI2026-10-07: 303 OI2026-10-08: 303 OI2026-10-09: 303 OI2026-10-13: 303 OI2026-10-14: 303 OI2026-10-15: 303 OI2026-10-16: 313 OI2026-10-21: 339 OI2026-10-23: 419 OI Oct 02, 2026Oct 23, 2026

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

FOUR contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 2026Viewing419+80
Oct 21, 2026339+26
Oct 16, 2026313+10
Oct 15, 20263030
Oct 14, 20263030
Oct 13, 20263030
Oct 09, 20263030
Oct 08, 20263030
Oct 07, 20263030
Oct 06, 2026303+2
Oct 05, 20263010
Oct 02, 2026301No prior observation