OITracker Cboe delayed data

Contract OI history

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Jan 21, 2028 EXPIRATION

MSFT $400.00 Put

MSFT280121P00400000

Latest saved OI4,077Oct 23, 2026
Last change-1vs 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. 4,1302,0650 2026-10-09: 4,130 OI2026-10-13: 4,103 OI2026-10-14: 4,103 OI2026-10-15: 4,074 OI2026-10-16: 4,072 OI2026-10-21: 4,078 OI2026-10-23: 4,077 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, 2026Viewing4,077-1
Oct 21, 20264,078+6
Oct 16, 20264,072-2
Oct 15, 20264,074-29
Oct 14, 20264,1030
Oct 13, 20264,103-27
Oct 09, 20264,130No prior observation