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Contract OI history

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Dec 18, 2026 EXPIRATION

ALGN $155.00 Put

ALGN261218P00155000

Latest saved OI189Oct 23, 2026
Last change0vs previous saved observation
Saved market days7Oct 09, 2026 onwards
Daily open interest Hover a point for its date and OI
ALGN $155.00 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. 189940 2026-10-09: 184 OI2026-10-13: 184 OI2026-10-14: 184 OI2026-10-15: 184 OI2026-10-16: 189 OI2026-10-21: 189 OI2026-10-23: 189 OI Oct 09, 2026Oct 23, 2026

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

ALGN contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 2026Viewing1890
Oct 21, 20261890
Oct 16, 2026189+5
Oct 15, 20261840
Oct 14, 20261840
Oct 13, 20261840
Oct 09, 2026184No prior observation