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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
Michael John IsaacsCLO;Sec2026-07-298,386$8.47
$71.05kSell
Anne Evans KingstonCStrat2026-07-297,662$8.47
$64.92kSell
Gene G. KinneyCEO;Pres2026-07-2884,000$8.56
$719.04kSell
Tran NguyenCFO;CStrat2026-07-2857,000$8.56
$487.92kSell
Michael John IsaacsCLO;Sec2026-07-284,694$8.56
$40.18kSell
Anne Evans KingstonCStrat2026-07-283,498$8.56
$29.94kSell
Brandon S. SmithCOO2026-07-2878,000$8.56
$667.68kSell
Chad J. SwansonCXO2026-07-2840,800$8.56
$349.25kSell
Chad J. SwansonCXO2026-07-283,467$8.56
$29.68kSell
Karin L. WalkerCAO2026-07-2815,000$8.56
$128.40kSell

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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$239.46MInsider
Oleg Nodelman18.01%9,426,640$79.28MInsider
Fmr LLC14.42%7,551,218$63.51MInstitution
Rubric Capital Management LP9.55%5,000,000$42.05MInstitution
Blackrock Inc8.87%4,644,160$39.06MInstitution
Elan Corp PLC6.08%3,182,253$26.76MInsider
State Street Corp3.70%1,938,498$16.30MInstitution
D E Shaw Co Inc3.37%1,763,347$14.83MInstitution
Adar1 Capital Management LLC3.02%1,581,443$13.30MInstitution
Acadian Asset Management LLC2.96%1,547,593$13.02MInstitution

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PRTA vs Biotech Stocks

TickerInst. %Insider %Net Insider (L12M)Net Insider (L3M)
PRTA52.52%47.48%Net SellingNet Selling
VALN2.25%0.00%
OCGN32.73%10.53%Net BuyingNet Buying
SGMT21.83%35.74%Net SellingNet Selling
OVID56.29%9.99%Net Buying
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, 81.14% 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 $231.20M.

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