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Contract OI history

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Dec 18, 2026 EXPIRATION

MSFT $400.00 Put

MSFT261218P00400000

Latest saved OI10,271Oct 23, 2026
Last change+227vs 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. 10,2715,1350 2026-10-09: 9,657 OI2026-10-13: 9,973 OI2026-10-14: 9,973 OI2026-10-15: 9,981 OI2026-10-16: 9,986 OI2026-10-21: 10,044 OI2026-10-23: 10,271 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, 2026Viewing10,271+227
Oct 21, 202610,044+58
Oct 16, 20269,986+5
Oct 15, 20269,981+8
Oct 14, 20269,9730
Oct 13, 20269,973+316
Oct 09, 20269,657No prior observation