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Contract OI history

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Sep 17, 2027 EXPIRATION

MSFT $400.00 Put

MSFT270917P00400000

Latest saved OI1,037Oct 23, 2026
Last change+36vs 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. 1,0375180 2026-10-09: 987 OI2026-10-13: 990 OI2026-10-14: 990 OI2026-10-15: 996 OI2026-10-16: 997 OI2026-10-21: 1,001 OI2026-10-23: 1,037 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, 2026Viewing1,037+36
Oct 21, 20261,001+4
Oct 16, 2026997+1
Oct 15, 2026996+6
Oct 14, 20269900
Oct 13, 2026990+3
Oct 09, 2026987No prior observation