Form 4 Filing for PROTHENA CORP PUBLIC LTD CO

William P. Scully, a 10% owner, acquired 162,000 ordinary shares of Prothena Corp Public Ltd Co. on September 29, 2026. The shares were purchased at a weighted average price of $8.677 per share, with prices ranging from $8.6000 to $8.7550. Following the transaction, Scully directly owns 927,000 shares and indirectly owns 187,000 shares through Manatee Equity Fund LLC. The filing was signed by Reid E. Buchanan under power of attorney for William P. Scully on September 30, 2026.