OITracker Cboe delayed data

Contract OI history

Back to ON

Sep 17, 2027 EXPIRATION

ON $55.00 Put

ON270917P00055000

Latest saved OI394Oct 23, 2026
Last change+11vs previous saved observation
Saved market days7Oct 09, 2026 onwards
Daily open interest Hover a point for its date and OI
ON $55.00 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. 3941970 2026-10-09: 23 OI2026-10-13: 23 OI2026-10-14: 23 OI2026-10-15: 23 OI2026-10-16: 383 OI2026-10-21: 383 OI2026-10-23: 394 OI Oct 09, 2026Oct 23, 2026

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

ON contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 2026Viewing394+11
Oct 21, 20263830
Oct 16, 2026383+360
Oct 15, 2026230
Oct 14, 2026230
Oct 13, 2026230
Oct 09, 202623No prior observation