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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% Owner2026-05-22100,000$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$284.16MInsider
Oleg Nodelman18.01%9,426,640$94.08MInsider
Fmr LLC14.42%7,551,218$75.36MInstitution
Rubric Capital Management LP9.55%5,000,000$49.90MInstitution
Blackrock Inc8.87%4,644,160$46.35MInstitution
Elan Corp PLC6.08%3,182,253$31.76MInsider
State Street Corp3.70%1,938,498$19.35MInstitution
D E Shaw Co Inc3.37%1,763,347$17.60MInstitution
Adar1 Capital Management LLC3.02%1,581,443$15.78MInstitution
Acadian Asset Management LLC2.96%1,547,593$15.44MInstitution

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PRTA vs Biotech Stocks

TickerInst. %Insider %Net Insider (L12M)Net Insider (L3M)
PRTA52.29%47.71%Net BuyingNet Buying
ACHV20.97%16.84%Net Selling
VALN2.25%0.00%
XOMA21.84%78.16%Net BuyingNet Buying
FDMT79.90%20.10%Net BuyingNet 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, 81.88% 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 $289.86M.

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