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Contract OI history

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Dec 15, 2028 EXPIRATION

MSFT $400.00 Put

MSFT281215P00400000

Latest saved OI3,106Oct 23, 2026
Last change-2vs previous saved observation
Saved market days7Oct 09, 2026 onwards
Daily open interest Hover a point for its date and OI
MSFT $400.00 put open interest history 7 saved observations from 2026-10-09 to 2026-10-23. Exact values and changes are listed in the table below. 3,2291,6140 2026-10-09: 3,229 OI2026-10-13: 3,224 OI2026-10-14: 3,224 OI2026-10-15: 3,227 OI2026-10-16: 3,106 OI2026-10-21: 3,108 OI2026-10-23: 3,106 OI Oct 09, 2026Oct 23, 2026

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

MSFT contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 2026Viewing3,106-2
Oct 21, 20263,108+2
Oct 16, 20263,106-121
Oct 15, 20263,227+3
Oct 14, 20263,2240
Oct 13, 20263,224-5
Oct 09, 20263,229No prior observation