Merus
MRUS
MRUS was delisted on the 29th of December, 2025.
268 hedge funds and large institutions have $6.69B invested in Merus in 2025 Q3 according to their latest regulatory filings, with 107 funds opening new positions, 66 increasing their positions, 73 reducing their positions, and 39 closing their positions.
174% more first-time investments, than exits
New positions opened: 107 | Existing positions closed: 39
105% more call options, than puts
Call options by funds: $169M | Put options by funds: $82.2M
70% more capital invested
Capital invested by funds: $3.93B → $6.69B (+$2.76B)
57% more funds holding in top 10
Funds holding in top 10: 21 → 33 (+12)
34% more funds holding
Funds holding: 200 → 268 (+68)
10% less repeat investments, than reductions
Existing positions increased: 66 | Existing positions reduced: 73
14.02% less ownership
Funds ownership: 108.07% → 94.05% (-14%)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
HI
HBK Investments
Dallas,
Texas
|
+$186M |
| 2 |
GCL
Glazer Capital LLC
New York
|
+$105M |
| 3 |
DKCM
Davidson Kempner Capital Management
New York
|
+$80.4M |
| 4 |
BlackRock
New York
|
+$73M |
| 5 |
Goldman Sachs
New York
|
+$70.9M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Fidelity Investments
Boston,
Massachusetts
|
-$305M |
| 2 |
Wellington Management Group
Boston,
Massachusetts
|
-$213M |
| 3 |
Holocene Advisors
New York
|
-$134M |
| 4 |
RI
RTW Investments
New York
|
-$129M |
| 5 |
Franklin Resources
San Mateo,
California
|
-$87M |
MRUS Hedge Fund Activity: Q3 2025 in Review
268 institutional investors reported a position in Merus (MRUS) for Q3 2025, worth a combined $6.69B — up 70% from $3.93B a quarter earlier.
Buyers outnumbered sellers: 107 funds opened new MRUS positions and 39 closed out — a net gain of 68 holders — while 66 added to existing stakes and 73 trimmed.
The largest buyer was HBK Investments, opening a new position worth an estimated $186M. The largest seller was Fidelity Investments, cutting an estimated $305M.
- 268 institutional investors held Merus (MRUS) as of Q3 2025, up from 200 in Q2 2025.
- Funds reported $6.69B of Merus stock for Q3 2025, up 70% quarter-over-quarter.
- 107 funds opened new Merus positions in Q3 2025 and 39 closed out, a net change of +68 holders.
- The largest Merus buyer in Q3 2025 was HBK Investments, an estimated $186M added.
- The largest Merus seller in Q3 2025 was Fidelity Investments, an estimated $305M sold.
Based on aggregated 13F filings for Q3 2025.