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Contract OI history

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Dec 18, 2026 EXPIRATION

STEP $40.00 Call

STEP261218C00040000

Latest saved OI154Oct 23, 2026
Last change-1vs previous saved observation
Saved market days6Oct 09, 2026 onwards
Daily open interest Hover a point for its date and OI
STEP $40.00 call open interest history 6 saved observations from 2026-10-09 to 2026-10-23. Exact values and changes are listed in the table below. 155770 2026-10-09: 124 OI2026-10-13: 155 OI2026-10-14: 155 OI2026-10-16: 155 OI2026-10-20: 155 OI2026-10-23: 154 OI Oct 09, 2026Oct 23, 2026

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

STEP contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 2026Viewing154-1
Oct 20, 20261550
Oct 16, 20261550
Oct 14, 20261550
Oct 13, 2026155+31
Oct 09, 2026124No prior observation