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

MERCK & CO. INC. (MRK) is widely held by institutional investors, with 3871 firms reporting positions valued at approximately $248.02B based on SEC Form 13F filings for the quarter ended June 30, 2026.

Blackrock, Inc. is the largest disclosed holder, reporting approximately $29.17B in MRK holdings in its latest filing.

Recent insider activity includes 19 tracked Form 4 transactions over the last three months, reflecting ongoing executive and director trading activity.