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Contract OI history

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Dec 18, 2026 EXPIRATION

ARMK $55.00 Put

ARMK261218P00055000

Latest saved OI377Oct 23, 2026
Last change0vs previous saved observation
Saved market days12Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
ARMK $55.00 put open interest history 12 saved observations from 2026-10-02 to 2026-10-23. Exact values and changes are listed in the table below. 3931960 2026-10-02: 393 OI2026-10-05: 393 OI2026-10-06: 393 OI2026-10-07: 393 OI2026-10-08: 393 OI2026-10-09: 369 OI2026-10-13: 369 OI2026-10-14: 369 OI2026-10-15: 365 OI2026-10-16: 368 OI2026-10-21: 377 OI2026-10-23: 377 OI Oct 02, 2026Oct 23, 2026

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

ARMK contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 2026Viewing3770
Oct 21, 2026377+9
Oct 16, 2026368+3
Oct 15, 2026365-4
Oct 14, 20263690
Oct 13, 20263690
Oct 09, 2026369-24
Oct 08, 20263930
Oct 07, 20263930
Oct 06, 20263930
Oct 05, 20263930
Oct 02, 2026393No prior observation