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Arrowhead Research
ARWR

Overview Fund Activity

277 hedge funds and large institutions have $1.67B invested in Arrowhead Research in 2025 Q2 according to their latest regulatory filings, with 58 funds opening new positions, 95 increasing their positions, 79 reducing their positions, and 37 closing their positions.

Holders
277
Holders Change
+16
Holders Change %
+6.13%
% of All Funds
3.72%
Holding in Top 10
3
Holding in Top 10 Change
-2
Holding in Top 10 Change %
-40%
% of All Funds
0.04%
New
58
Increased
95
Reduced
79
Closed
37
Calls
$7.07M
Puts
$10M
Net Calls
-$2.98M
Net Calls Change
-$1.39M

Top Buyers

1
Vanguard Group
1
Vanguard Group
Pennsylvania
$245M
2
Marshall Wace
2
Marshall Wace
United Kingdom
$34.1M
3
Norges Bank
3
Norges Bank
Norway
$30.4M
4
Fidelity Investments
4
Fidelity Investments
Massachusetts
$81.7M
5
BBA
5
Baker Bros. Advisors
New York
$14.8M

Top Sellers

1
UBS AM
1
UBS AM
Illinois
$42.4M
2
T. Rowe Price Investment Management
2
T. Rowe Price Investment Management
Maryland
$13M
3
Citadel Advisors
3
Citadel Advisors
Florida
$983K
4
Two Sigma Investments
4
Two Sigma Investments
New York
$2.11M
5
State Street
5
State Street
Massachusetts
$101M
Name Market Value Shares Shares
Change 		Shares
Change %
BlackRock
1
BlackRock
New York
$307M 19,424,887 -501,267 -3%
Vanguard Group
2
Vanguard Group
Pennsylvania
$245M 15,525,072 +2,322,510 +18%
ACA
3
Avoro Capital Advisors
New York
$167M 10,600,000 -511,111 -5%
State Street
4
State Street
Massachusetts
$101M 6,371,056 -628,193 -9%
SPC
5
Slate Path Capital
New York
$82.7M 5,232,000 – –
Fidelity Investments
6
Fidelity Investments
Massachusetts
$81.7M 5,170,310 +1,855,228 +56%
Geode Capital Management
7
Geode Capital Management
Massachusetts
$47.1M 2,978,505 +28,193 +1%
UBS AM
8
UBS AM
Illinois
$42.4M 2,684,317 -2,100,745 -44%
SL
9
Siren LLC
Connecticut
$42.2M 2,669,880 – –
Marshall Wace
10
Marshall Wace
United Kingdom
$34.1M 2,155,998 +2,096,238 +3,508%
Goldman Sachs
11
Goldman Sachs
New York
$33.4M 2,115,314 +373,648 +21%
Norges Bank
12
Norges Bank
Norway
$30.4M 1,924,957 +1,924,957 New
Morgan Stanley
13
Morgan Stanley
New York
$26.9M 1,705,266 -143,270 -8%
UBS Group
14
UBS Group
Switzerland
$25.3M 1,600,596 -25,967 -2%
Northern Trust
15
Northern Trust
Illinois
$20.1M 1,272,066 +61,253 +5%
Charles Schwab
16
Charles Schwab
California
$18.5M 1,170,745 +135,455 +13%
Aberdeen Group
17
Aberdeen Group
United Kingdom
$15.2M 960,245 -112,582 -10%
BBA
18
Baker Bros. Advisors
New York
$14.8M 939,174 +939,174 New
T. Rowe Price Investment Management
19
T. Rowe Price Investment Management
Maryland
$13M 822,343 -1,706,639 -67%
WFC
20
Western Financial Corp
California
$13M 820,239 – –
Bank of New York Mellon
21
Bank of New York Mellon
New York
$12.9M 818,079 +42,040 +5%
Invesco
22
Invesco
Georgia
$12.1M 762,665 +448,585 +143%
WP
23
Woodline Partners
California
$11.8M 746,156 +183,981 +33%
Bank of America
24
Bank of America
North Carolina
$9.87M 624,496 -173,704 -22%
PFM
25
Privium Fund Management
Netherlands
$9.85M 612,214 -17,000 -3%
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