Merus
MRUS
MRUS was delisted on the 29th of December, 2025.
185 hedge funds and large institutions have $2.98B invested in Merus in 2025 Q1 according to their latest regulatory filings, with 24 funds opening new positions, 72 increasing their positions, 63 reducing their positions, and 31 closing their positions.
313% more call options, than puts
Call options by funds: $17.1M | Put options by funds: $4.13M
31% more funds holding in top 10
Funds holding in top 10: 13 → 17 (+4)
14% more repeat investments, than reductions
Existing positions increased: 72 | Existing positions reduced: 63
1% more capital invested
Capital invested by funds: $2.96B → $2.98B (+$23.5M)
0.27% less ownership
Funds ownership: 102.79% → 102.53% (-0.27%)
4% less funds holding
Funds holding: 192 → 185 (-7)
23% less first-time investments, than exits
New positions opened: 24 | Existing positions closed: 31
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
PBA
Paradigm Biocapital Advisors
New York
|
+$73.2M |
| 2 |
Wellington Management Group
Boston,
Massachusetts
|
+$53.2M |
| 3 |
ACA
Avoro Capital Advisors
New York
|
+$38.2M |
| 4 |
CC
Commodore Capital
New York
|
+$26.1M |
| 5 |
Westfield Capital Management
Boston,
Massachusetts
|
+$22.2M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
BCM
Boxer Capital Management
San Diego,
California
|
-$52.3M |
| 2 |
LGM
Logos Global Management
San Francisco,
California
|
-$31.5M |
| 3 |
Marshall Wace
London,
United Kingdom
|
-$26.3M |
| 4 |
VA
VR Adviser
New York
|
-$24.9M |
| 5 |
Federated Hermes
Pittsburgh,
Pennsylvania
|
-$23.9M |
MRUS Hedge Fund Activity: Q1 2025 in Review
185 institutional investors reported a position in Merus (MRUS) for Q1 2025, worth a combined $2.98B — up 0.79% from $2.96B a quarter earlier.
Sellers outnumbered buyers: 31 funds closed out of MRUS and 24 opened new positions — a net loss of 7 holders — while 63 trimmed existing stakes and 72 added.
The largest buyer was Paradigm Biocapital Advisors, adding an estimated $73.2M. The largest seller was Boxer Capital Management, cutting an estimated $52.3M.
- 185 institutional investors held Merus (MRUS) as of Q1 2025, down from 192 in Q4 2024.
- Funds reported $2.98B of Merus stock for Q1 2025, up 0.79% quarter-over-quarter.
- 24 funds opened new Merus positions in Q1 2025 and 31 closed out, a net change of -7 holders.
- The largest Merus buyer in Q1 2025 was Paradigm Biocapital Advisors, an estimated $73.2M added.
- The largest Merus seller in Q1 2025 was Boxer Capital Management, an estimated $52.3M sold.
Based on aggregated 13F filings for Q1 2025.