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Contract OI history

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Dec 18, 2026 EXPIRATION

CTAS $195.00 Put

CTAS261218P00195000

Latest saved OI588Oct 23, 2026
Last change+12vs previous saved observation
Saved market days7Oct 09, 2026 onwards
Daily open interest Hover a point for its date and OI
CTAS $195.00 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. 5882940 2026-10-09: 560 OI2026-10-13: 573 OI2026-10-14: 573 OI2026-10-15: 574 OI2026-10-16: 574 OI2026-10-21: 576 OI2026-10-23: 588 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, 2026Viewing588+12
Oct 21, 2026576+2
Oct 16, 20265740
Oct 15, 2026574+1
Oct 14, 20265730
Oct 13, 2026573+13
Oct 09, 2026560No prior observation