MERCK & CO. INC. (MRK) Institutional Ownership and Insiders Activity

MERCK & CO. INC. (MRK) is widely held by institutional investors, with 12 tracked firms reporting positions valued at approximately $232.29M based on SEC Form 13F filings for the quarter ended June 30, 2026.

Causeway Capital Management is the largest disclosed holder, reporting approximately $102.75M in MRK holdings in its latest filing.

Recent insider activity includes 7 tracked Form 4 transactions over the last three months, reflecting ongoing executive and director trading activity.