X0407 4 2023-05-17 0001559053 PROTHENA CORP PUBLIC LTD CO PRTA 0001422772 Kim Helen Susan C/O PROTHENA BIOSCIENCES INC 331 OYSTER POINT BOULEVARD SOUTH SAN FRANCISCO CA 94080 true false Stock Option (Right to Buy) 76 2023-05-17 4 A 0 15000 0 A 2033-05-17 Ordinary Shares 15000 15000 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 2024 of the Issuer's shareholders, assuming continuous service as a director until such vesting date. /s/ Michael Malecek, as Attorney in Fact for Helen S. Kim 2023-05-19