OITracker Cboe delayed data

Contract OI history

Back to MRK

Jan 21, 2028 EXPIRATION

MRK $55.00 Put

MRK280121P00055000

Latest saved OI659Oct 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 $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. 6603300 2026-10-02: 660 OI2026-10-05: 660 OI2026-10-06: 660 OI2026-10-07: 660 OI2026-10-08: 660 OI2026-10-09: 660 OI2026-10-13: 660 OI2026-10-14: 660 OI2026-10-15: 660 OI2026-10-16: 660 OI2026-10-21: 660 OI2026-10-23: 659 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, 2026Viewing659-1
Oct 21, 20266600
Oct 16, 20266600
Oct 15, 20266600
Oct 14, 20266600
Oct 13, 20266600
Oct 09, 20266600
Oct 08, 20266600
Oct 07, 20266600
Oct 06, 20266600
Oct 05, 20266600
Oct 02, 2026660No prior observation