X0508 4 2025-05-14 0001559053 PROTHENA CORP PUBLIC LTD CO PRTA 0001422772 Kim Helen Susan C/O PROTHENA BIOSCIENCES INC 1800 SIERRA POINT PARKWAY BRISBANE CA 94005 true false Stock Option (Right to Buy) 6.885 2025-05-14 4 A 0 20183 0 A 2035-05-14 Ordinary Shares 20183 20183 D The shares subject to the option will vest and become exercisable as to 100% of the total number of shares subject to the option on the earlier of the first anniversary of the grant date or the day of the annual general meeting in 2026 of the Issuer's shareholders, assuming continuous service as a director until such vesting date. /s/ Michael J. Malecek, as Attorney-in-Fact for Helen S. Kim 2025-05-16