Merck & Co., Inc.
MRK- Exchange
- NYSE
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0000310158
In the last 90 days, Merck & Co., Inc. insiders filed 0 open-market purchases and 7 sales; 3,854 institutions reported holding it in 13F filings for Q2 2026, worth $254.3B in total; 4 superinvestors hold it, including Harris Associates (Oakmark) and Fairfax Financial.
Superinvestors holding MRK, Q2 2026
4 superinvestors report holding Merck & Co., Inc. on Form 13F, worth $1.58B in total. Weight is Merck & Co., Inc.'s share of each 13F portfolio; actions compare shares with Q1 2026.
| Superinvestor | % of portfolio | Shares | Value | vs. previous quarter |
|---|---|---|---|---|
| Harris Associates (Oakmark)Bill Nygren | 2.1% | 12,073,109 | $1.55B | Reduced−2.4% |
| Fairfax FinancialPrem Watsa | 0.8% | 172,900 | $22.2M | Unchanged |
| Semper AugustusChristopher Bloomstran | 0.6% | 44,633 | $5.74M | Unchanged |
| Gardner Russo & QuinnTom Russo | <0.1% | 1,642 | $211.0K | Reduced−23.3% |
Moves by quarter
Superinvestors that opened, added to, trimmed or sold out of MRK each quarter, comparing shares with the quarter before. A superinvestor that didn't file for a quarter isn't listed, and isn't counted as selling.
Q2 2026
4 superinvestors holding at quarter end
- Reduced
- Harris Associates (Oakmark) (−2.4%), Gardner Russo & Quinn (−23.3%)
Q1 2026
4 superinvestors holding at quarter end
- New
- Gardner Russo & Quinn
- Added
- Semper Augustus (+0.4%)
- Reduced
- Harris Associates (Oakmark) (−12.2%)
Q4 2025
3 superinvestors holding at quarter end
- Added
- Harris Associates (Oakmark) (+43.4%)
Q3 2025
3 superinvestors holding at quarter end
- Added
- Harris Associates (Oakmark) (+7.6%)
Q2 2025
3 superinvestors holding at quarter end
- Added
- Harris Associates (Oakmark) (+22.3%)
- Sold out
- Gardner Russo & Quinn
Q1 2025
4 superinvestors holding at quarter end
- Added
- Harris Associates (Oakmark) (+19.6%)
- Reduced
- Gardner Russo & Quinn (−5.6%)
Q4 2024
4 superinvestors holding at quarter end
- Added
- Harris Associates (Oakmark) (+112.2%)
- Reduced
- Gardner Russo & Quinn (−5.2%)
- Sold out
- Soros Fund Management
Q3 2024
5 superinvestors holding at quarter end
- New
- Harris Associates (Oakmark)
- Reduced
- Gardner Russo & Quinn (−10.4%)
- Sold out
- Greenwoods Asset Management
Q2 2024
5 superinvestors holding at quarter end
- Added
- Soros Fund Management (+71.4%)
- Reduced
- Gardner Russo & Quinn (−1.9%)
Q1 2024
5 superinvestors holding at quarter end
- New
- Greenwoods Asset Management
- Reduced
- Soros Fund Management (−22.2%), Semper Augustus (−0.3%), Gardner Russo & Quinn (−7.7%)
- Sold out
- Maverick Capital
Q4 2023
5 superinvestors holding at quarter end
- New
- Soros Fund Management
- Added
- Semper Augustus (+0.3%)
- Reduced
- Maverick Capital (−39.4%), Gardner Russo & Quinn (−0.9%)
- Sold out
- Gates Foundation Trust
Q3 2023
5 superinvestors holding at quarter end
- New
- Gates Foundation Trust
- Added
- Maverick Capital (+151.7%)
- Reduced
- Gardner Russo & Quinn (−3.0%)
Q2 2023
4 superinvestors holding at quarter end
- New
- Maverick Capital
- Added
- Gardner Russo & Quinn (+3.4%)
- Reduced
- Semper Augustus (−0.1%)
Q1 2023
3 superinvestors holding at quarter end
- Added
- Gardner Russo & Quinn (+4.3%)
- Sold out
- Maverick Capital
Q4 2022
4 superinvestors holding at quarter end
- Reduced
- Gardner Russo & Quinn (−4.8%), Maverick Capital (−24.7%)
Q3 2022
4 superinvestors holding at quarter end
- New
- Maverick Capital
- Reduced
- Gardner Russo & Quinn (−1.3%)
Q2 2022
3 superinvestors holding at quarter end
- Added
- Semper Augustus (+0.9%), Gardner Russo & Quinn (+0.3%)
Q1 2022
3 superinvestors holding at quarter end
- Added
- Gardner Russo & Quinn (+0.3%)
Q4 2021
3 superinvestors holding at quarter end
- Added
- Gardner Russo & Quinn (+0.3%)
- Sold out
- Maverick Capital
Q3 2021
4 superinvestors holding at quarter end
- Added
- Gardner Russo & Quinn (+0.3%)
- Reduced
- Maverick Capital (−81.6%)
- Sold out
- Berkshire Hathaway
Q2 2021
5 superinvestors holding at quarter end
- Added
- Gardner Russo & Quinn (+0.3%)
- Reduced
- Berkshire Hathaway (−48.8%), Maverick Capital (−83.1%)