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NASDAQ: PRTA
Prothena Corp Public Ltd Co Stock Ownership - Who owns Prothena Public Co?

OverviewForecastEarningsRevenueDividendOwnership

Insider buying vs selling

Have Prothena Corp Public Ltd Co insiders been buying or selling?

Buy
Sell
NameRoleDateSharesPriceValue
William P. Scully10% Owner2026-06-0450,000$9.31
$465.30kBuy
William P. Scully10% Owner2026-06-0250,000$9.43
$471.30kBuy
William P. Scully10% Owner2026-05-22100,000$9.81
$981.30kBuy

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Net Insider Buy/Sell (L12M) Ownership

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PRTA Shareholders

What type of owners hold Prothena Corp Public Ltd Co stock?

Institutional
Insider
Retail
NameHoldSharesValueType
Ecor1 Capital LLC54.39%28,473,156$243.73MInsider
Oleg Nodelman18.01%9,426,640$80.69MInsider
Fmr LLC14.42%7,551,218$64.64MInstitution
Rubric Capital Management LP9.55%5,000,000$42.80MInstitution
Blackrock Inc8.87%4,644,160$39.75MInstitution
Elan Corp PLC6.08%3,182,253$27.24MInsider
State Street Corp3.70%1,938,498$16.59MInstitution
D E Shaw Co Inc3.37%1,763,347$15.09MInstitution
Adar1 Capital Management LLC3.02%1,581,443$13.54MInstitution
Acadian Asset Management LLC2.96%1,547,593$13.25MInstitution

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PRTA vs Biotech Stocks

TickerInst. %Insider %Net Insider (L12M)Net Insider (L3M)
PRTA52.23%47.77%Net BuyingNet Buying
IMMX49.76%17.93%Net Buying
OVID56.29%9.96%Net BuyingNet Buying
ANL9.66%14.42%Net SellingNet Selling
NGNE48.66%51.34%Net SellingNet Selling
View Top Biotech Stocks

Prothena Public Co Stock Ownership FAQ

Who owns Prothena Public Co?

Prothena Public Co (NASDAQ: PRTA) is owned by 89.74% institutional shareholders, 82.07% Prothena Public Co insiders, and 0.00% retail investors. Ecor1 Capital LLC is the largest individual Prothena Public Co shareholder, owning 28.47M shares representing 54.39% of the company. Ecor1 Capital LLC's Prothena Public Co shares are currently valued at $241.17M.

If you're new to stock investing, here's how to buy Prothena Public Co stock.
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