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Contract OI history

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Jan 21, 2028 EXPIRATION

MRK $80.00 Put

MRK280121P00080000

Latest saved OI340Oct 23, 2026
Last change+6vs previous saved observation
Saved market days12Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
MRK $80.00 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. 3401700 2026-10-02: 334 OI2026-10-05: 334 OI2026-10-06: 334 OI2026-10-07: 334 OI2026-10-08: 334 OI2026-10-09: 334 OI2026-10-13: 334 OI2026-10-14: 334 OI2026-10-15: 334 OI2026-10-16: 334 OI2026-10-21: 334 OI2026-10-23: 340 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, 2026Viewing340+6
Oct 21, 20263340
Oct 16, 20263340
Oct 15, 20263340
Oct 14, 20263340
Oct 13, 20263340
Oct 09, 20263340
Oct 08, 20263340
Oct 07, 20263340
Oct 06, 20263340
Oct 05, 20263340
Oct 02, 2026334No prior observation