Last updated Aug 21, 2026
Merck & Co., Inc. (MRK) is a publicly traded company. This page tracks every superinvestor 13F holding, congressional stock trade, and Form 4 insider transaction in MRK. Across our datasets, 6 superinvestors hold MRK and 26 members of Congress have traded it.
Notable holders include Prem Watsa, Mairs & Power, and Ray Dalio. Active congressional traders include Ro Khanna, Michael McCaul, and Julie Johnson.
Key takeaways