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Prothena Corp
PRTA

Name Holding Trade Value Shares
Change 		Change in
Stake
Fidelity Investments
1
Fidelity Investments
Massachusetts
$48M -$302K -40,184 -0.5%
BlackRock
2
BlackRock
New York
$23.9M -$772K -102,903 -3%
ACM
3
ADAR1 Capital Management
Texas
$20.5M +$25.3M +3,375,009 New
AC
4
Armistice Capital
New York
$13.6M +$300K +40,000 +2%
Vanguard Group
5
Vanguard Group
Pennsylvania
$13.2M +$6.81M +906,956 +71%
PAI
6
Palo Alto Investors
California
$7.74M -$2.89M -384,981 -23%
Federated Hermes
7
Federated Hermes
Pennsylvania
$7.17M +$4.76M +634,832 +116%
Citadel Advisors
8
Citadel Advisors
Florida
$6.97M +$7.94M +1,058,223 +1,184%
Acadian Asset Management
9
Acadian Asset Management
Massachusetts
$6.18M +$7.64M +1,018,177 New
State Street
10
State Street
Massachusetts
$6.1M -$3.88M -516,362 -34%
Dimensional Fund Advisors
11
Dimensional Fund Advisors
Texas
$5.84M +$744K +99,191 +11%
Morgan Stanley
12
Morgan Stanley
New York
$5.79M +$1.75M +233,268 +32%
Geode Capital Management
13
Geode Capital Management
Massachusetts
$5.67M -$611K -81,346 -8%
RC
14
Rangeley Capital
Connecticut
$4.34M +$5.37M +715,367 New
Jacobs Levy Equity Management
15
Jacobs Levy Equity Management
New Jersey
$4.21M +$5.06M +674,601 +3,636%
Balyasny Asset Management
16
Balyasny Asset Management
Illinois
$3.5M +$4.32M +575,792 New
TI
17
Trexquant Investment
Connecticut
$3.36M +$4.15M +552,826 New
Goldman Sachs
18
Goldman Sachs
New York
$3.21M +$134K +17,861 +3%
CSS
19
Cubist Systematic Strategies
Connecticut
$3.05M +$3.77M +501,764 New
RSCM
20
Rock Springs Capital Management
Maryland
$2.99M – – –
GIM
21
Granahan Investment Management
Massachusetts
$2.8M +$3.46M +461,082 New
BC
22
Birchview Capital
Vermont
$2.74M +$886K +118,045 +35%
Qube Research & Technologies (QRT)
23
Qube Research & Technologies (QRT)
United Kingdom
$2.52M +$3.11M +414,828 New
D.E. Shaw & Co
24
D.E. Shaw & Co
New York
$2.38M +$2.8M +373,692 +2,099%
Mariner
25
Mariner
Kansas
$2.35M +$241K +32,058 +9%
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