5 hedge funds and family offices disclose a MRK position in their latest SEC 13F filing — combined $26.9M in market value. Of those, 2 are classified as value investors.
| # | Investor | Fund | Shares | Value | % of Portfolio | Filed |
|---|---|---|---|---|---|---|
| 1 | Prem Watsa | Fairfax Financial Holdings Ltd | 172,900 | $20.8M | 1.07% | 2026-03-31 |
| 2 | Mairs & Power | Mairs & Power Inc | 51,999 | $5.5M | 0.05% | 2025-12-31 |
| 3 | Matrix Asset Advisors | Matrix Asset Advisors Inc/NY | 2,862 | $301K | 0.03% | 2025-12-31 |
| 4 | Thomas Russo | Gardner Russo & Quinn LLC | 2,141 | $258K | 0.00% | 2026-03-31 |
| 5 | Christopher Bloomstran | Semper Augustus Investments Group LLC | 990 | $104K | 0.02% | 2025-12-31 |
As of the latest 13F window, 5 tracked superinvestors hold MRK. The largest disclosed position is Prem Watsa at $20.8M (1.1% of portfolio).
13F filings are due 45 days after each quarter end and capture long-equity positions held by U.S. institutional managers with $100M+ AUM. Use this page to see exactly who is buying MRK, how concentrated each position is, and the implied conviction level relative to the rest of each investor's book.
Key takeaways
5 hedge funds and family offices disclose a MRK position in their latest SEC 13F filing — combined $26.9M in market value. Of those, 2 are classified as value investors.
| # | Investor | Fund | Shares | Value | % of Portfolio | Filed |
|---|---|---|---|---|---|---|
| 1 | Prem Watsa | Fairfax Financial Holdings Ltd | 172,900 | $20.8M | 1.07% | 2026-03-31 |
| 2 | Mairs & Power | Mairs & Power Inc | 51,999 | $5.5M | 0.05% | 2025-12-31 |
| 3 | Matrix Asset Advisors | Matrix Asset Advisors Inc/NY | 2,862 | $301K | 0.03% | 2025-12-31 |
| 4 | Thomas Russo | Gardner Russo & Quinn LLC | 2,141 | $258K | 0.00% | 2026-03-31 |
| 5 | Christopher Bloomstran | Semper Augustus Investments Group LLC | 990 | $104K | 0.02% | 2025-12-31 |
As of the latest 13F window, 5 tracked superinvestors hold MRK. The largest disclosed position is Prem Watsa at $20.8M (1.1% of portfolio).
13F filings are due 45 days after each quarter end and capture long-equity positions held by U.S. institutional managers with $100M+ AUM. Use this page to see exactly who is buying MRK, how concentrated each position is, and the implied conviction level relative to the rest of each investor's book.
Key takeaways
