Who owns MRK? 13F holders and whale ownership
MRK is tracked across public portfolios in Whale Analyzer. This page answers who owns MRK, which top funds are buying MRK, aggregate disclosed value, and recent position changes based on public data. NPS Korea is the largest reported holder at $693M; the top five funds control 100.0% of reported ownership; institutions were net buying last quarter (3 increased, 1 reduced); the stock trades above the aggregate whale cost basis of $74.49. Top tracked holders include NPS Korea, Samuel Isaly, Chris Bloomstran, and Horizon Kinetics.
Continue to the live MRK dashboardTop holders
| Investor | Reported value | Shares | Change |
|---|---|---|---|
| NPS Korea 13F portfolio National Pension Service holdings | $693.1M | 5.8M | Reduced |
| Samuel Isaly 13F portfolio OrbiMed Advisors holdings | $79.8M | 663.4K | New |
| Chris Bloomstran 13F portfolio Semper Augustus Investments holdings | $5.4M | 44.6K | Increased |
| Horizon Kinetics 13F portfolio Horizon Kinetics Asset Management holdings | $3.4M | 28.4K | Increased |
| Edgewood Management 13F portfolio Edgewood Management LLC holdings | $928.4K | 7.7K | Held |
Ownership concentration
Reported ownership of MRK is highly concentrated across tracked institutions.
- Single largest holder: 88.6% of reported ownership
- Top 5 holders: 100.0%
- Top 10 holders: 100.0%
Whale activity this quarter
Across 5 tracked institutions, 3 increased, 1 reduced, 1 held. Net positioning is net buying.
- NPS Korea — National Pension Service ($693.1M) (▼ 0.5% qoq shares) · avg cost $79.30
- Samuel Isaly — OrbiMed Advisors ($79.8M) · avg cost $33.58
- Chris Bloomstran — Semper Augustus Investments ($5.4M) (▲ 0.4% qoq shares) · avg cost $51.01
- Horizon Kinetics — Horizon Kinetics Asset Management ($3.4M) (▲ 0.8% qoq shares) · avg cost $91.89
- Edgewood Management — Edgewood Management LLC ($928.4K) (→ 0.0% qoq shares) · avg cost $71.26
Whale cost basis vs current price
The aggregate tracked cost basis is $74.49 versus a current price of $128.66, so MRK trades above its cost basis (+72.7%). Average unrealized P&L across tracked holders: 96%.
Sector positioning — Health Care
MRK sits within the Health Care sector alongside 221 other tracked names. Compare whale ownership across peers:
How to use this page
Values are reported public positions from tracked 13F filers and disclosures — not real-time ownership totals. Open the live MRK dashboard for price charts and cross-investor scans, or read the SEC 13F guide.
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Learn more in Whale Analyzer Academy
Deepen your read on MRK with these Whale Analyzer Academy guides:
Frequently asked questions
Who owns MRK stock?
Whale Analyzer tracks 5 public institutional holders of MRK with a combined reported value of $782.6M. See the holder table above for the largest tracked positions.
Which top funds are buying MRK?
Tracked institutions were net buying last quarter — 3 increased, 1 reduced, 1 held. Check the "Change" column: "New" = fresh position, "Increased" = added, "Reduced" = trimmed.
How concentrated is MRK ownership?
The top five tracked holders report 100.0% of aggregate ownership.
Is MRK above or below the whale cost basis?
The aggregate tracked cost basis is $74.49 versus a current price of $128.66 (+72.7%).
What does 13F ownership mean for MRK?
Use the interactive MRK dashboard on Whale Analyzer for real-time holder analysis, or read our 13F Alpha Signals Guide.