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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% Owner2026-09-0227,000$9.47
$255.74kBuy
William P. Scully10% Owner2026-08-2050,000$8.79
$439.45kBuy
William P. Scully10% Owner2026-08-073,500$8.62
$30.17kBuy
William P. Scully10% Owner2026-08-0734,000$8.62
$293.05kBuy
Michael John IsaacsCLO;Sec2026-07-298,386$8.47
$71.05kSell
Anne Evans KingstonCStrat2026-07-297,662$8.47
$64.92kSell
Michael John IsaacsCLO;Sec2026-07-284,694$8.56
$40.18kSell
Anne Evans KingstonCStrat2026-07-283,498$8.56
$29.94kSell
Gene G. KinneyCEO;Pres2026-07-2884,000$8.56
$719.04kSell
Tran NguyenCFO;CStrat2026-07-2857,000$8.56
$487.92kSell

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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 LLC55.46%28,473,156$279.61MInsider
Oleg Nodelman18.36%9,426,640$92.57MInsider
Elan Corp PLC6.20%3,182,253$31.25MInsider
William P. Scully2.26%1,162,500$11.42MInsider
Michael J. Malecek0.16%80,000$785.60kInsider
Gene G. Kinney0.13%68,793$675.55kInsider
Anne Evans Kingston0.11%55,782$547.78kInsider
Brandon S. Smith0.10%52,000$510.64kInsider
Chad J. Swanson0.08%40,733$400.00kInsider
Tran Nguyen0.08%40,205$394.81kInsider

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PRTA vs Biotech Stocks

TickerInst. %Insider %Net Insider (L12M)Net Insider (L3M)
PRTA0.09%83.15%Net BuyingNet Selling
KYTX0.06%42.88%Net Buying
EDIT0.08%21.44%Net SellingNet Selling
PBYI0.07%42.52%Net SellingNet Selling
ENTX0.01%4.95%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 0.09% institutional shareholders, 83.15% Prothena Public Co insiders, and 16.76% retail investors. Ecor1 Capital LLC is the largest individual Prothena Public Co shareholder, owning 28.47M shares representing 55.46% of the company. Ecor1 Capital LLC's Prothena Public Co shares are currently valued at $279.61M.

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