Whale Analyzer
MRK Institutional Holders and 13F Ownership
Compare 16 tracked holders of MRK, their reported positions and disclosed changes. Coverage is limited to the investors tracked by Whale Analyzer; these records do not establish all shareholders or current trades. Available original SEC filings for tracked 13F holders are linked below. Top tracked holders include Oakmark Funds, National Pension Service, Capital Research Global Investors, and Causeway Capital Management.
Continue to the live MRK dashboardTop holders
| Investor | Reported value | Shares | Change | Report date |
|---|---|---|---|---|
| Oakmark Funds 13F holdings | $1.55B | 12.1M | Reduced | 2026-06-30 |
| National Pension Service 13F holdings | $744.2M | 5.8M | Increased | 2026-06-30 |
| Capital Research Global Investors 13F holdings | $247.4M | 1.9M | Reduced | 2026-06-30 |
| Causeway Capital Management 13F holdings | $122.7M | 954.9K | Increased | 2026-06-30 |
| OrbiMed Advisors 13F holdings | $85.2M | 663.4K | Held | 2026-06-30 |
| Kahn Brothers Group 13F holdings | $28.0M | 218.2K | Reduced | 2026-06-30 |
| Fairfax Financial Holdings 13F holdings | $22.2M | 172.9K | Held | 2026-06-30 |
| Dodge & Cox 13F holdings | $17.4M | 135.8K | Reduced | 2026-06-30 |
| Mairs & Power Funds 13F holdings | $6.6M | 51.5K | Increased | 2026-06-30 |
| Semper Augustus Investments 13F holdings | $5.7M | 44.6K | Held | 2026-06-30 |
| PRIMECAP Management Company 13F holdings | $4.6M | 35.7K | Reduced | 2026-06-30 |
| Bridgewater Associates 13F holdings | $3.9M | 30.3K | New | 2026-06-30 |
Original SEC filing sources
These recorded filings support the tracked 13F rows included in the aggregate reported values on this page. See each holder profile for source coverage and context for other disclosure types.
- Oakmark Funds SEC filing (0000813917-26-000042) · report date 2026-06-30
- National Pension Service SEC filing (0001193125-26-347818) · report date 2026-06-30
- Capital Research Global Investors SEC filing (0001422848-26-000094) · report date 2026-06-30
- Causeway Capital Management SEC filing (0000945621-26-001052) · report date 2026-06-30
- OrbiMed Advisors SEC filing (0001172661-26-003740) · report date 2026-06-30
- Kahn Brothers Group SEC filing (0001039565-26-000006) · report date 2026-06-30
- Fairfax Financial Holdings SEC filing (0001104659-26-096276) · report date 2026-06-30
- Dodge & Cox SEC filing (0001193125-26-349535) · report date 2026-06-30
- Mairs & Power Funds SEC filing (0001172661-26-003496) · report date 2026-06-30
- Semper Augustus Investments SEC filing (0001941040-26-000625) · report date 2026-06-30
- PRIMECAP Management Company SEC filing (0000763212-26-000028) · report date 2026-06-30
- Bridgewater Associates SEC filing (0001350694-26-000003) · report date 2026-06-30
- Horizon Kinetics Asset Management SEC filing (0001398344-26-014047) · report date 2026-06-30
- Edgewood Management LLC SEC filing (0001062993-26-004244) · report date 2026-06-30
- Matrix Asset Advisors SEC filing (0001172661-26-004502) · report date 2026-09-30
- Gardner Russo & Quinn SEC filing (0000860643-26-000005) · report date 2026-06-30
Tracked-sample concentration
Reported position value for MRK is highly concentrated within this tracked-holder sample. These percentages are not market-wide ownership shares.
- Largest tracked holder: 54.5% of aggregate reported value in this sample
- Top 5 tracked holders: 96.7% of aggregate reported value in this sample
- Top 10 tracked holders: 99.5% of aggregate reported value in this sample
Whale activity this quarter
Across 16 tracked holders, 8 reduced, 4 increased, 4 held. Net positioning is net selling.
- Oakmark Funds ($1.55B) (▼ 2.4% qoq shares)
- National Pension Service ($744.2M) (▲ 0.5% qoq shares) · modeled avg cost estimate $78.40
- Capital Research Global Investors ($247.4M) (▼ 6.6% qoq shares) · modeled avg cost estimate $56.01
- Causeway Capital Management ($122.7M) (▲ 11.8% qoq shares)
- OrbiMed Advisors ($85.2M) (→ 0.0% qoq shares)
- Kahn Brothers Group ($28.0M) (▼ 4.0% qoq shares)
- Fairfax Financial Holdings ($22.2M) (→ 0.0% qoq shares)
- Dodge & Cox ($17.4M) (▼ 0.2% qoq shares)
Modeled cost estimate vs current price
The share-weighted modeled cost estimate across 5 covered tracked holders is $72.72 versus a current price of $146.73, so MRK trades above that estimate (+101.8%). This model does not establish any filer's actual purchase price, unrealized gain, or investment return.
Sector positioning — Health Care
MRK sits within the Health Care sector alongside 253 other tracked names. Compare reported positions across tracked peers:
How to use this page
Values are reported public positions from tracked 13F filers and disclosures — not real-time or market-wide 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 16 public-disclosure holders of MRK with a combined reported value of $2.84B. See the holder table above for the largest tracked positions.
Which top funds are buying MRK?
Tracked holders were net selling last quarter — 8 reduced, 4 increased, 4 held. Check the "Change" column: "New" = fresh position, "Increased" = added, "Reduced" = trimmed.
How concentrated is the tracked MRK sample?
The top five tracked holders account for 96.7% of aggregate reported value in this tracked sample. This is not a market-wide ownership percentage.
How does MRK compare with the modeled cost estimate?
The share-weighted modeled cost estimate across 5 covered tracked holders is $72.72 versus a current price of $146.73 (+101.8%). It is not an actual purchase price, unrealized gain, or investment return.
What does 13F ownership mean for MRK?
These are historical reported positions from tracked filers, not real-time ownership or a complete shareholder register. Use the interactive MRK dashboard to explore them, or read our 13F Alpha Signals Guide.