Merus
MRUS
MRUS was delisted on the 29th of December, 2025.
59 hedge funds and large institutions have $558M invested in Merus in 2021 Q1 according to their latest regulatory filings, with 20 funds opening new positions, 22 increasing their positions, 7 reducing their positions, and 4 closing their positions.
400% more first-time investments, than exits
New positions opened: 20 | Existing positions closed: 4
214% more repeat investments, than reductions
Existing positions increased: 22 | Existing positions reduced: 7
50% more funds holding in top 10
Funds holding in top 10: 2 → 3 (+1)
49% more capital invested
Capital invested by funds: $374M → $558M (+$184M)
37% more funds holding
Funds holding: 43 → 59 (+16)
3.29% less ownership
Funds ownership: 73.38% → 70.09% (-3.3%)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
BI
BVF Inc
San Francisco,
California
|
+$34.1M |
| 2 |
ACA
Avoro Capital Advisors
New York
|
+$15.3M |
| 3 |
Wellington Management Group
Boston,
Massachusetts
|
+$13.9M |
| 4 |
APM
Avidity Partners Management
Dallas,
Texas
|
+$11.2M |
| 5 |
BC
Boxer Capital
San Diego,
California
|
+$10.9M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
HA
HHLR Advisors
Grand Cayman,
Cayman Islands
|
-$12.8M |
| 2 |
IC
Ikarian Capital
Dallas,
Texas
|
-$9.83M |
| 3 |
OM
Opaleye Management
Boston,
Massachusetts
|
-$6.19M |
| 4 |
BFM
Boothbay Fund Management
New York
|
-$1.03M |
| 5 |
PIM
Platinum Investment Management
Sydney Australia 2000,
Australia
|
-$329K |
MRUS Hedge Fund Activity: Q1 2021 in Review
59 institutional investors reported a position in Merus (MRUS) for Q1 2021, worth a combined $558M — up 49% from $374M a quarter earlier.
Buyers outnumbered sellers: 20 funds opened new MRUS positions and 4 closed out — a net gain of 16 holders — while 22 added to existing stakes and 7 trimmed.
The largest buyer was BVF Inc, adding an estimated $34.1M. The largest seller was HHLR Advisors, cutting an estimated $12.8M.
- 59 institutional investors held Merus (MRUS) as of Q1 2021, up from 43 in Q4 2020.
- Funds reported $558M of Merus stock for Q1 2021, up 49% quarter-over-quarter.
- 20 funds opened new Merus positions in Q1 2021 and 4 closed out, a net change of +16 holders.
- The largest Merus buyer in Q1 2021 was BVF Inc, an estimated $34.1M added.
- The largest Merus seller in Q1 2021 was HHLR Advisors, an estimated $12.8M sold.
Based on aggregated 13F filings for Q1 2021.