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Contract OI history

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Dec 15, 2028 EXPIRATION

MSFT $320.00 Put

MSFT281215P00320000

Latest saved OI1,434Oct 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 $320.00 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. 1,4467230 2026-10-09: 1,446 OI2026-10-13: 1,436 OI2026-10-14: 1,436 OI2026-10-15: 1,436 OI2026-10-16: 1,436 OI2026-10-21: 1,436 OI2026-10-23: 1,434 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, 2026Viewing1,434-2
Oct 21, 20261,4360
Oct 16, 20261,4360
Oct 15, 20261,4360
Oct 14, 20261,4360
Oct 13, 20261,436-10
Oct 09, 20261,446No prior observation