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Contract OI history

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Dec 18, 2026 EXPIRATION

IONS $55.00 Put

IONS261218P00055000

Latest saved OI39Oct 19, 2026
Last change-20vs previous saved observation
Saved market days5Oct 09, 2026 onwards
Daily open interest Hover a point for its date and OI
IONS $55.00 put open interest history 5 saved observations from 2026-10-09 to 2026-10-19. Exact values and changes are listed in the table below. 59290 2026-10-09: 59 OI2026-10-13: 59 OI2026-10-14: 59 OI2026-10-16: 59 OI2026-10-19: 39 OI Oct 09, 2026Oct 19, 2026

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

IONS contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 19, 2026Viewing39-20
Oct 16, 2026590
Oct 14, 2026590
Oct 13, 2026590
Oct 09, 202659No prior observation