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Contract OI history

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Dec 18, 2026 EXPIRATION

MRK $155.00 Put

MRK261218P00155000

Latest saved OI447Oct 23, 2026
Last change+1vs previous saved observation
Saved market days12Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
MRK $155.00 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. 4562280 2026-10-02: 455 OI2026-10-05: 455 OI2026-10-06: 455 OI2026-10-07: 456 OI2026-10-08: 456 OI2026-10-09: 446 OI2026-10-13: 446 OI2026-10-14: 446 OI2026-10-15: 446 OI2026-10-16: 446 OI2026-10-21: 446 OI2026-10-23: 447 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, 2026Viewing447+1
Oct 21, 20264460
Oct 16, 20264460
Oct 15, 20264460
Oct 14, 20264460
Oct 13, 20264460
Oct 09, 2026446-10
Oct 08, 20264560
Oct 07, 2026456+1
Oct 06, 20264550
Oct 05, 20264550
Oct 02, 2026455No prior observation