X0607 3 2026-05-07 0 0001559053 PROTHENA CORP PUBLIC LTD CO PRTA 0001045463 SCULLY WILLIAM P false 771 MANATEE COVE VERO BEACH FL 32963 0 0 1 0 Ordinary Shares, par value $0.01 per share 736000 D Ordinary Shares, par value $0.01 per share 80000 I By Manatee Equity Fund LLC Ordinary Shares, par value $0.01 per share 52000 I By Spouse The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein. Exhibit List: Exhibit 24 - Power of Attorney Reid E. Buchanan by POA from William P. Scully 2026-05-14