PRTA
Prothena Corp (PRTA)
NASDAQ
$8.86-$0.33 (-3.58%)
Price as of Jun 03, 2026 4:22 PM EDT
  • $533.0M
    Market Cap
  • 90.27%
    1-Year Change
  • Biotechnology
    Industry

Top Holders

Institutional
Mutual Funds
Holder
Ownership %
Shares Held
Change (Shares, %)
Report Date
FMR LLC
14.42%
7.6M
0 (0.00%)
Mar 31, 2026
RUBRIC CAPITAL MANAGEMENT LP
9.55%
5.0M
+1.3M (+26.45%)
Mar 31, 2026
BLACKROCK, INC.
8.87%
4.6M
+536,701 (+11.56%)
Mar 31, 2026
BLACKROCK FUNDING, INC. /DE
7.87%
4.1M
+93,989 (+2.28%)
Dec 31, 2024
BLACKROCK INC.
7.37%
3.9M
+138,266 (+3.58%)
Jun 30, 2024
VANGUARD GROUP INC
4.09%
2.1M
+91,060 (+4.25%)
Dec 31, 2025
STATE STREET CORP
3.70%
1.9M
-329,304 (-16.99%)
Mar 31, 2026

Current Ownership Distribution

  • Institutions896.6M (83.40%)
  • Mutual Funds166.3M (15.47%)
  • Insiders12.1M (1.13%)
  • Other0 (0.00%)

Insider Transactions

  • 1.13% (12.1M)
    Current InsiderOwnership (%, shares)
  • 1
    Number of InsiderBuying (last 12 months)
  • $7.2M
    Amount of InsiderBuying (last 12 months)
  • 0
    Number of InsiderSelling (last 12 months)
  • $0.00
    Amount of InsiderSelling (last 12 months)
Insider Name & Title
Type
Date
Transaction Value
Shares
Share Price
Shares After Transactions
SCULLY WILLIAM P
Buy
May 22, 2026
$981,300.00
100,000
$9.81
836,000
Ekman Lars
Award
May 15, 2026
$0.00
27,000
$0.00
27,000
Selkoe Dennis J.
Award
May 15, 2026
$0.00
27,000
$0.00
27,000
WELCH DANIEL G
Award
May 15, 2026
$0.00
27,000
$0.00
27,000
COLLIER RICHARD T
Award
May 15, 2026
$0.00
27,000
$0.00
27,000
Walker Karin L
Chief Accounting Officer
Award
Mar 03, 2026
$0.00
150,000
$0.00
150,000
Zago Wagner M.
Chief Scientific Officer
Award
Mar 03, 2026
$0.00
190,000
$0.00
190,000
Malecek Michael J
Chief Legal Officer
Award
Mar 03, 2026
$0.00
190,000
$0.00
190,000
Smith Brandon S.
Chief Operating Officer
Award
Mar 03, 2026
$0.00
190,000
$0.00
190,000
Swanson Chad J.
Chief Development Officer
Award
Mar 03, 2026
$0.00
190,000
$0.00
190,000
Nguyen Tran
Chief Strategy Officer and CFO
Award
Jul 28, 2025
$0.00
95,000
$0.00
97,205
Malecek Michael J
Chief Legal Officer
Award
Jul 28, 2025
$0.00
80,000
$0.00
80,000
Kinney Gene G.
President and CEO
Award
Jul 28, 2025
$0.00
140,000
$0.00
152,793
Swanson Chad J.
Chief Development Officer
Award
Jul 28, 2025
$0.00
85,000
$0.00
85,000
Walker Karin L
Chief Accounting Officer
Award
Jul 28, 2025
$0.00
25,000
$0.00
25,000
Zago Wagner M.
Chief Scientific Officer
Award
Jul 28, 2025
$0.00
85,000
$0.00
85,000
Smith Brandon S.
Chief Operating Officer
Award
Jul 28, 2025
$0.00
130,000
$0.00
130,000
EcoR1 Capital, LLC
Sell
May 06, 2025
$15.2M
2.0M
$7.64
5.3M
EcoR1 Capital, LLC
Sell
May 05, 2025
$7.9M
977,693
$8.11
7.3M
EcoR1 Capital, LLC
Sell
May 02, 2025
$27.7M
3.3M
$8.36
8.3M
Malecek Michael J
Chief Legal Officer
Award
Mar 05, 2025
$0.00
107,500
$0.00
107,500
Karp Carol D.
Chief Regulatory Officer
Award
Mar 05, 2025
$0.00
107,500
$0.00
107,500
Ford David A
Chief People Officer
Award
Mar 05, 2025
$0.00
107,500
$0.00
107,500
Walker Karin L
Chief Accounting Officer
Award
Mar 05, 2025
$0.00
70,000
$0.00
70,000
Zago Wagner M.
Chief Scientific Officer
Award
Mar 05, 2025
$0.00
107,500
$0.00
107,500
Swanson Chad J.
Chief Development Officer
Award
Mar 05, 2025
$0.00
107,500
$0.00
107,500
Nguyen Tran
Chief Strategy Officer and CFO
Award
Mar 05, 2025
$0.00
107,500
$0.00
107,500
SCULLY WILLIAM P
Gift
Jan 15, 2025
$0.00
12,000
$0.00
47,000
SCULLY WILLIAM P
Buy
Jan 14, 2025
$1.3M
100,000
$12.79
735,993
SCULLY WILLIAM P
Gift
Jan 03, 2025
$0.00
1,000
$0.00
635,993