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Contract OI history

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Jan 21, 2028 EXPIRATION

MSFT $420.00 Put

MSFT280121P00420000

Latest saved OI3,739Oct 23, 2026
Last change+3vs previous saved observation
Saved market days7Oct 09, 2026 onwards
Daily open interest Hover a point for its date and OI
MSFT $420.00 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. 3,7391,8690 2026-10-09: 3,705 OI2026-10-13: 3,700 OI2026-10-14: 3,700 OI2026-10-15: 3,688 OI2026-10-16: 3,689 OI2026-10-21: 3,736 OI2026-10-23: 3,739 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, 2026Viewing3,739+3
Oct 21, 20263,736+47
Oct 16, 20263,689+1
Oct 15, 20263,688-12
Oct 14, 20263,7000
Oct 13, 20263,700-5
Oct 09, 20263,705No prior observation