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Contract OI history

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Nov 20, 2026 EXPIRATION

CTAS $210.00 Put

CTAS261120P00210000

Latest saved OI370Oct 23, 2026
Last change+254vs previous saved observation
Saved market days7Oct 09, 2026 onwards
Daily open interest Hover a point for its date and OI
CTAS $210.00 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. 3701850 2026-10-09: 115 OI2026-10-13: 115 OI2026-10-14: 115 OI2026-10-15: 116 OI2026-10-16: 116 OI2026-10-21: 116 OI2026-10-23: 370 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, 2026Viewing370+254
Oct 21, 20261160
Oct 16, 20261160
Oct 15, 2026116+1
Oct 14, 20261150
Oct 13, 20261150
Oct 09, 2026115No prior observation