Merck
MRK
3,810 hedge funds and large institutions have $232B invested in Merck in 2026 Q1 according to their latest regulatory filings, with 317 funds opening new positions, 1,466 increasing their positions, 1,593 reducing their positions, and 123 closing their positions.
158% more first-time investments, than exits
New positions opened: 317 | Existing positions closed: 123
23% more call options, than puts
Call options by funds: $3.43B | Put options by funds: $2.78B
14% more funds holding in top 10
Funds holding in top 10: 77 → 88 (+11)
12% more capital invested
Capital invested by funds: $206B → $232B (+$25.4B)
4% more funds holding
Funds holding: 3,671 → 3,810 (+139)
0.87% less ownership
Funds ownership: 78.92% → 78.05% (-0.87%)
8% less repeat investments, than reductions
Existing positions increased: 1,466 | Existing positions reduced: 1,593
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 |
Millennium Management
New York
|
-$558M |
| 4 |
Massachusetts Financial Services
Boston,
Massachusetts
|
-$478M |
| 5 |
Los Angeles Capital Management
Los Angeles,
California
|
-$429M |
MRK Hedge Fund Activity: Q1 2026 in Review
3,810 of the 8,207 institutional investors tracked by Wall St. Rank reported a position in Merck (MRK) for Q1 2026, worth a combined $232B — up 12% from $206B a quarter earlier.
Buyers outnumbered sellers: 317 funds opened new MRK positions and 123 closed out — a net gain of 194 holders — while 1,466 added to existing stakes and 1,593 trimmed.
The largest buyer was JP Morgan Chase, adding an estimated $2.74B. The largest seller was Arrowstreet Capital, cutting an estimated $809M.
- 3,810 institutional investors held Merck (MRK) as of Q1 2026, up from 3,671 in Q4 2025.
- Funds reported $232B of Merck stock for Q1 2026, up 12% quarter-over-quarter.
- 317 funds opened new Merck positions in Q1 2026 and 123 closed out, a net change of +194 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.