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Contract OI history

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Dec 18, 2026 EXPIRATION

MSFT $420.00 Put

MSFT261218P00420000

Latest saved OI6,346Oct 23, 2026
Last change+85vs 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. 6,5183,2590 2026-10-09: 6,518 OI2026-10-13: 6,501 OI2026-10-14: 6,501 OI2026-10-15: 6,459 OI2026-10-16: 6,456 OI2026-10-21: 6,261 OI2026-10-23: 6,346 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, 2026Viewing6,346+85
Oct 21, 20266,261-195
Oct 16, 20266,456-3
Oct 15, 20266,459-42
Oct 14, 20266,5010
Oct 13, 20266,501-17
Oct 09, 20266,518No prior observation