Prothena Ownership

Who are the major shareholders and have insiders been buying or selling?


Recent Insider Transactions

NasdaqGS:PRTA Recent Insider Transactions by Companies or Individuals
DateValueNameEntityRoleSharesMax Price
05 May 22BuyUS$30,840,599EcoR1 Capital, LLCCompany1,062,736US$29.02
05 May 22SellUS$30,840,599EcoR1 Capital, LLCCompany1,062,736US$29.02
12 Jan 22BuyUS$11,250,300EcoR1 Capital, LLCCompany300,000US$37.50

Insider Trading Volume

Insider Buying: Insufficient data to determine if insiders have bought more shares than they have sold in the past 3 months.


Ownership Breakdown

What is the ownership structure of PRTA?
Owner TypeNumber of SharesOwnership Percentage
General Public979,2782.0%
Individual Insiders2,552,1635.3%
Hedge Funds11,584,28023.9%
Institutions33,260,84568.8%

Dilution of Shares: Shareholders have been diluted in the past year, with total shares outstanding growing by 3.8%.


Top Shareholders

Top 25 shareholders own 83.07% of the company
OwnershipNameSharesCurrent ValueChange %Portfolio %
23.95%
EcoR1 Capital, LLC
11,584,280$690.2m0%21.01%
7.92%
T. Rowe Price Group, Inc.
3,829,903$228.2m-35.8%0.03%
6.54%
FMR LLC
3,162,390$188.4m8.1%0.02%
6.49%
BlackRock, Inc.
3,138,744$187.0m-9.58%no data
5.23%
William Scully
2,530,500$150.8m0%no data
4.07%
Avidity Partners Management, L.P.
1,967,000$117.2m0%2.53%
3.89%
State Street Global Advisors, Inc.
1,881,794$112.1m-16.22%0.01%
3.41%
Palo Alto Investors LP
1,649,777$98.3m-1.89%7.55%
3.18%
First Light Asset Management, LLC
1,538,678$91.7m-20.61%9.33%
3.07%
Dimensional Fund Advisors LP
1,483,905$88.4m-5.29%0.02%
1.74%
PFM Health Sciences, LP
840,238$50.1m143.47%1.95%
1.67%
The Vanguard Group, Inc.
807,960$48.1m-2.55%no data
1.4%
Rock Springs Capital Management LP
678,462$40.4m0%1.06%
1.32%
Renaissance Technologies LLC
636,900$37.9m-7.16%0.05%
1.31%
Geode Capital Management, LLC
635,724$37.9m0.64%no data
1.09%
Redmile Group, LLC
525,575$31.3m-28.61%1.07%
1.01%
Teachers Insurance and Annuity Association-College Retirement Equities Fund
490,452$29.2m-32.18%0.01%
0.89%
Wellington Management Group LLP
431,509$25.7m361.73%no data
0.83%
Maple Rock Capital Partners Inc.
399,414$23.8m19.59%2.1%
0.72%
Federated Hermes, Inc.
350,137$20.9m7675.64%0.06%
0.72%
Northern Trust Global Investments
347,148$20.7m-1.44%no data
0.69%
Two Sigma Advisers, LP
335,000$20.0m-25.17%0.06%
0.66%
Prosight Management, LP
321,093$19.1m-41.62%10.48%
0.65%
Suvretta Capital Management, LLC
316,531$18.9m0%0.77%
0.63%
Finepoint Capital LP
305,400$18.2m-33.25%6.6%