OITracker Cboe delayed data

Contract OI history

Back to SION

Jan 15, 2027 EXPIRATION

SION $17.50 Call

SION270115C00017500

Latest saved OI935Oct 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
SION $17.50 call open interest history 7 saved observations from 2026-10-09 to 2026-10-23. Exact values and changes are listed in the table below. 9354670 2026-10-09: 933 OI2026-10-13: 933 OI2026-10-14: 933 OI2026-10-15: 933 OI2026-10-16: 933 OI2026-10-20: 934 OI2026-10-23: 935 OI Oct 09, 2026Oct 23, 2026

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

SION contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 2026935+1
Oct 20, 2026Viewing934+1
Oct 16, 20269330
Oct 15, 20269330
Oct 14, 20269330
Oct 13, 20269330
Oct 09, 2026933No prior observation