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Contract OI history

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May 21, 2027 EXPIRATION

OUST $40.00 Put

OUST270521P00040000

Latest saved OI160Oct 23, 2026
Last change0vs previous saved observation
Saved market days7Oct 09, 2026 onwards
Daily open interest Hover a point for its date and OI
OUST $40.00 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. 191950 2026-10-09: 190 OI2026-10-13: 191 OI2026-10-14: 191 OI2026-10-15: 189 OI2026-10-16: 190 OI2026-10-21: 160 OI2026-10-23: 160 OI Oct 09, 2026Oct 23, 2026

All saved dates are shown. Changes compare consecutive saved observations. Missing observations are not filled with zero.

OUST contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 20261600
Oct 21, 2026Viewing160-30
Oct 16, 2026190+1
Oct 15, 2026189-2
Oct 14, 20261910
Oct 13, 2026191+1
Oct 09, 2026190No prior observation