Prothena CORP Public LTD CO Schedule 13D activist filings
Filed when an investor crosses five percent and intends to influence the company — the activist disclosure.
NASDAQ
Investment firm EcoR1 Capital, LLC and its affiliates have sold their entire holdings in Prothena Corp Public Ltd Co, no longer beneficially owning more than five percent of the company's Ordinary Shares as of May 28, 2025.
NASDAQ
SCHEDULE 13D/A: EcoR1 Capital Significantly Reduces Stake in Prothena, Selling Over 6 Million Shares
Investment firm EcoR1 Capital and its affiliates have significantly reduced their beneficial ownership in Prothena Corp Public Ltd Co, selling over 6.2 million ordinary shares in early May 2025.
NASDAQ
EcoR1 Capital, LLC and its affiliates report a continued 21.5% beneficial ownership in Prothena Corporation plc, while Oleg Nodelman, a key figure, has resigned from Prothena's board of directors.