Form 4 Filing for PROTHENA CORP PUBLIC LTD CO

This filing details a transaction by William P. Scully, a 10% owner of PROTHENA CORP PUBLIC LTD CO (PRTA). On June 16, 2026, Scully acquired 20,000 ordinary shares, par value $0.01 per share, at a weighted average price of $7.8995. The shares were purchased in multiple transactions at prices ranging from $7.8600 to $7.9312. Following this transaction, Scully directly owns 756,000 shares. Additionally, he has indirect ownership of 80,000 shares through Manatee Equity Fund LLC and 52,000 shares through his spouse. The filing was signed by Reid E. Buchanan under power of attorney for William P. Scully on June 18, 2026.