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Contract OI history

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Dec 18, 2026 EXPIRATION

CTAS $180.00 Put

CTAS261218P00180000

Latest saved OI122Oct 23, 2026
Last change+1vs previous saved observation
Saved market days7Oct 09, 2026 onwards
Daily open interest Hover a point for its date and OI
CTAS $180.00 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. 122610 2026-10-09: 120 OI2026-10-13: 121 OI2026-10-14: 121 OI2026-10-15: 122 OI2026-10-16: 121 OI2026-10-21: 121 OI2026-10-23: 122 OI Oct 09, 2026Oct 23, 2026

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

CTAS contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 2026Viewing122+1
Oct 21, 20261210
Oct 16, 2026121-1
Oct 15, 2026122+1
Oct 14, 20261210
Oct 13, 2026121+1
Oct 09, 2026120No prior observation