Merck
MRK
3,796 hedge funds and large institutions have $234B invested in Merck in 2026 Q1 according to their latest regulatory filings, with 317 funds opening new positions, 1,457 increasing their positions, 1,589 reducing their positions, and 122 closing their positions.
160% more first-time investments, than exits
New positions opened: 317 | Existing positions closed: 122
23% more call options, than puts
Call options by funds: $3.43B | Put options by funds: $2.78B
16% more funds holding in top 10
Funds holding in top 10: 77 → 89 (+12)
13% more capital invested
Capital invested by funds: $207B → $234B (+$26.8B)
4% more funds holding
Funds holding: 3,660 → 3,796 (+136)
8% less repeat investments, than reductions
Existing positions increased: 1,457 | Existing positions reduced: 1,589
1.03% less ownership
Funds ownership: 79.13% → 78.1% (-1%)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
JP Morgan Chase
New York
|
+$2.74B |
| 2 |
BlackRock
New York
|
+$778M |
| 3 |
T. Rowe Price Associates
Baltimore,
Maryland
|
+$495M |
| 4 |
Fidelity Investments
Boston,
Massachusetts
|
+$425M |
| 5 |
Nuveen
Charlotte,
North Carolina
|
+$363M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Arrowstreet Capital
Boston,
Massachusetts
|
-$809M |
| 2 |
UBS Group
Zurich,
Switzerland
|
-$605M |
| 3 |
Corient Private Wealth
Miami,
Florida
|
-$602M |
| 4 |
Millennium Management
New York
|
-$558M |
| 5 |
Massachusetts Financial Services
Boston,
Massachusetts
|
-$478M |
MRK Hedge Fund Activity: Q1 2026 in Review
3,796 of the 8,172 institutional investors tracked by Wall St. Rank reported a position in Merck (MRK) for Q1 2026, worth a combined $234B — up 13% from $207B a quarter earlier.
Buyers outnumbered sellers: 317 funds opened new MRK positions and 122 closed out — a net gain of 195 holders — while 1,457 added to existing stakes and 1,589 trimmed.
The largest buyer was JP Morgan Chase, adding an estimated $2.74B. The largest seller was Arrowstreet Capital, cutting an estimated $809M.
- 3,796 institutional investors held Merck (MRK) as of Q1 2026, up from 3,660 in Q4 2025.
- Funds reported $234B of Merck stock for Q1 2026, up 13% quarter-over-quarter.
- 317 funds opened new Merck positions in Q1 2026 and 122 closed out, a net change of +195 holders.
- The largest Merck buyer in Q1 2026 was JP Morgan Chase, an estimated $2.74B added.
- The largest Merck seller in Q1 2026 was Arrowstreet Capital, an estimated $809M sold.
Based on aggregated 13F filings for Q1 2026.