Prothena 10% owner William P. Scully buys 27,000 shares for $255,739

• Prothena 10% owner William P. Scully bought 27,000 ordinary shares at a weighted-average price of $9.47.
• Direct holdings rose to 827,000 ordinary shares.
• He also reported 83,500 ordinary shares held indirectly via Manatee Equity Fund LLC.
• An additional 52,000 ordinary shares were reported as indirectly held by his spouse.

Disclaimer: This news brief was created by Public Technologies (PUBT) using generative artificial intelligence. While PUBT strives to provide accurate and timely information, this AI-generated content is for informational purposes only and should not be interpreted as financial, investment, or legal advice. Prothena Corporation plc published the original content used to generate this news brief via EDGAR, the Electronic Data Gathering, Analysis, and Retrieval system operated by the U.S. Securities and Exchange Commission (Ref. ID: 0001045463-26-000015), on September 03, 2026, and is solely responsible for the information contained therein.