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Merus
MRUS

Overview Fund Activity

198 hedge funds and large institutions have $3.93B invested in Merus in 2025 Q2 according to their latest regulatory filings, with 47 funds opening new positions, 74 increasing their positions, 63 reducing their positions, and 30 closing their positions.

Holders
198
Holders Change
+13
Holders Change %
+7.03%
% of All Funds
2.66%
Holding in Top 10
21
Holding in Top 10 Change
+4
Holding in Top 10 Change %
+23.53%
% of All Funds
0.28%
New
47
Increased
74
Reduced
63
Closed
30
Calls
$36.1M
Puts
$21.6M
Net Calls
+$14.5M
Net Calls Change
+$1.55M

Top Buyers

1
T. Rowe Price Associates
1
T. Rowe Price Associates
Maryland
$119M
2
Ameriprise
2
Ameriprise
Minnesota
$59.6M
3
PBA
3
Paradigm Biocapital Advisors
New York
$225M
4
Adage Capital Partners
4
Adage Capital Partners
Massachusetts
$43.8M
5
Westfield Capital Management
5
Westfield Capital Management
Massachusetts
$107M

Top Sellers

1
SC
1
Samlyn Capital
New York
$40.2M
2
Wellington Management Group
2
Wellington Management Group
Massachusetts
$196M
3
CC
3
Commodore Capital
New York
$185M
4
BlackRock
4
BlackRock
New York
$55.3M
5
Millennium Management
5
Millennium Management
New York
$831K
Name Market Value Shares Shares
Change 		Shares
Change %
Fidelity Investments
1
Fidelity Investments
Massachusetts
$394M 7,490,377 +523,463 +8%
PBA
2
Paradigm Biocapital Advisors
New York
$225M 4,281,954 +912,255 +27%
RI
3
RTW Investments
New York
$210M 4,000,553 -168,840 -4%
Wellington Management Group
4
Wellington Management Group
Massachusetts
$196M 3,726,723 -991,449 -21%
CC
5
Commodore Capital
New York
$185M 3,525,000 -947,840 -21%
DM
6
Deerfield Management
New York
$178M 3,384,628 +210,700 +7%
ACA
7
Avoro Capital Advisors
New York
$166M 3,155,555 +155,555 +5%
T. Rowe Price Associates
8
T. Rowe Price Associates
Maryland
$119M 2,262,011 +1,166,269 +106%
Holocene Advisors
9
Holocene Advisors
New York
$117M 2,225,241 +351,616 +19%
Westfield Capital Management
10
Westfield Capital Management
Massachusetts
$107M 2,042,388 +541,168 +36%
Franklin Resources
11
Franklin Resources
California
$96.7M 1,837,575 -153,618 -8%
PCH
12
Polar Capital Holdings
United Kingdom
$84.7M 1,611,049 -95,813 -6%
LCM
13
Lynx1 Capital Management
Puerto Rico
$82.5M 1,568,841 – –
WP
14
Woodline Partners
California
$81.2M 1,542,900 +142,729 +10%
Federated Hermes
15
Federated Hermes
Pennsylvania
$80.4M 1,528,587 +483,962 +46%
DCM
16
Driehaus Capital Management
Illinois
$71.9M 1,366,244 +112,095 +9%
Ameriprise
17
Ameriprise
Minnesota
$59.6M 1,133,857 +1,031,457 +1,007%
CAM
18
Cormorant Asset Management
Massachusetts
$58.9M 1,120,000 +380,000 +51%
AllianceBernstein
19
AllianceBernstein
Tennessee
$58M 1,102,356 +363,068 +49%
RSCM
20
Rock Springs Capital Management
Maryland
$55.9M 1,063,608 +82,857 +8%
BlackRock
21
BlackRock
New York
$55.3M 1,050,942 -640,927 -38%
Pictet Asset Management
22
Pictet Asset Management
Switzerland
$48.1M 915,252 -116,849 -11%
SL
23
Siren LLC
Connecticut
$44.9M 853,467 -190,000 -18%
Adage Capital Partners
24
Adage Capital Partners
Massachusetts
$43.8M 833,397 +833,397 New
Invesco
25
Invesco
Georgia
$43.8M 833,361 +5,144 +0.6%
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