OITracker Cboe delayed data

Contract OI history

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Dec 18, 2026 EXPIRATION

MRK $55.00 Put

MRK261218P00055000

Latest saved OI581Oct 23, 2026
Last change-7vs previous saved observation
Saved market days12Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
MRK $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. 5882940 2026-10-02: 588 OI2026-10-05: 588 OI2026-10-06: 588 OI2026-10-07: 588 OI2026-10-08: 588 OI2026-10-09: 588 OI2026-10-13: 588 OI2026-10-14: 588 OI2026-10-15: 588 OI2026-10-16: 588 OI2026-10-21: 588 OI2026-10-23: 581 OI Oct 02, 2026Oct 23, 2026

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

MRK contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 2026Viewing581-7
Oct 21, 20265880
Oct 16, 20265880
Oct 15, 20265880
Oct 14, 20265880
Oct 13, 20265880
Oct 09, 20265880
Oct 08, 20265880
Oct 07, 20265880
Oct 06, 20265880
Oct 05, 20265880
Oct 02, 2026588No prior observation