Merck (MRK) Held by Superinvestors
MERCK & CO. INC. (MRK) is currently held by 11 superinvestors tracked by InsiderSet, with a combined reported market value of approximately $257.81M based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
Causeway Capital Management is currently the largest disclosed institutional shareholder of MRK tracked by InsiderSet, reporting ownership valued at approximately $122.71M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $142.78M, representing an estimated gain of +16.36% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 100% of the total disclosed MRK value among the investors covered in this analysis. Major shareholders include Causeway Capital Management, Sequoia Financial Advisors, Kahn Brothers Group, and several other long-term asset managers with concentrated positions in MERCK & CO. INC. (MRK).
This page ranks the largest institutional MRK shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Causeway Capital Management | Sarah Ketterer | 1.33% | 954,932 | $122,708,787 | $142,781,433 | +$20,072,646 | +16.36% |
| Sequoia Financial Advisors | 0.19% | 292,117 | $37,536,985 | $43,677,334 | +$6,140,349 | +16.36% | |
| Kahn Brothers Group | Thomas Graham, Alan, Irving Kahns | 4.43% | 218,182 | $28,036,427 | $32,622,573 | +$4,586,146 | +16.36% |
| Fairfax Financial Holdings | Prem Watsa | 0.84% | 172,900 | $22,198,631 | $25,852,008 | +$3,653,377 | +16.46% |
| Dodge & Cox Stock Fund | V. D. Dodge, E. M. Cox | 0.01% | 135,750 | $17,443,875 | $20,297,340 | +$2,853,465 | +16.36% |
| Cullen Value Fund | Jim Cullen | 1.86% | 109,838 | $15,976,066 | $16,422,978 | +$446,912 | +2.80% |
| Mairs & Power Growth Fund | Andrew R. Adams | 0.06% | 51,519 | $6,620,192 | $7,703,121 | +$1,082,929 | +16.36% |
| Semper Augustus Investments Group | Christopher Bloomstran | 0.65% | 44,633 | $5,735,341 | $6,673,526 | +$938,185 | +16.36% |
| Matrix Private Capital Group | Richard S. Fuld | 0.48% | 8,551 | $1,106,072 | $1,278,546 | +$172,474 | +15.59% |
| Matrix Advisors Value Fund | David Katz | 0.02% | 1,621 | $235,548 | $242,372 | +$6,824 | +2.90% |
| Gardner Russo & Quinn | Thomas Russo | 0.00% | 1,642 | $211,006 | $245,512 | +$34,506 | +16.35% |
Frequently asked questions about MRK
Who are the largest superinvestors holding MRK?
The largest superinvestors holding MRK in the latest SEC Form 13F filings include Causeway Capital Management, Sequoia Financial Advisors, Kahn Brothers Group, Fairfax Financial Holdings, and Dodge & Cox Stock Fund. InsiderSet ranks these superinvestors by their latest reported MRK position.
What does the MRK superinvestors page include?
This page tracks MRK positions reported by a curated group of notable institutional investors and fund managers through SEC Form 13F. MERCK & CO. INC. (MRK) on this page reflects disclosed 13F holdings among those superinvestors, not every institutional shareholder of the stock.
How many superinvestors hold MRK?
InsiderSet currently tracks 11 superinvestors reporting MRK holdings in the latest available 13F data. This is the curated set on this page, not the total number of institutions that own MRK.
How much MRK stock do superinvestors hold?
Superinvestors tracked by InsiderSet disclosed approximately $257.81M in MRK holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value, and it covers the curated superinvestors on this page rather than every institutional filer.
When were MRK superinvestor holdings last updated?
The latest MRK superinvestor holdings on InsiderSet are based on SEC Form 13F filings for the quarter ended June 30, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time holdings.
Are superinvestor MRK holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by these superinvestors as of the end of the reporting quarter. A superinvestor may have changed its MRK position after the reporting date.
Are superinvestors buying or selling MRK?
Buying and selling can be analyzed by comparing MRK positions across consecutive 13F reporting periods. InsiderSet's MRK Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View MRK ownership changes.
How have superinvestor MRK holdings changed over time?
InsiderSet tracks MRK holdings among these superinvestors across multiple 13F reporting periods, so holder counts, reported value, and reported shares can be compared over time.