Prothena files Form 3 initial beneficial ownership statement for William P. Scully

• Prothena Form 3 filed May 14, 2026 shows William P. Scully reporting beneficial ownership tied to 10% owner status, with event date May 7, 2026.
• Directly held 736,000 ordinary shares.
• Indirect holdings total 132,000 ordinary shares, including 80,000 held by Manatee Equity Fund LLC and 52,000 held by spouse.

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