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Contract OI history

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Dec 18, 2026 EXPIRATION

CTAS $190.00 Put

CTAS261218P00190000

Latest saved OI168Oct 23, 2026
Last change+2vs previous saved observation
Saved market days7Oct 09, 2026 onwards
Daily open interest Hover a point for its date and OI
CTAS $190.00 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. 168840 2026-10-09: 116 OI2026-10-13: 158 OI2026-10-14: 158 OI2026-10-15: 159 OI2026-10-16: 160 OI2026-10-21: 166 OI2026-10-23: 168 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, 2026Viewing168+2
Oct 21, 2026166+6
Oct 16, 2026160+1
Oct 15, 2026159+1
Oct 14, 20261580
Oct 13, 2026158+42
Oct 09, 2026116No prior observation