| Subsidiary Name | Jurisdiction of Incorporation or Organization | |||||||
| Prothena Biosciences Limited | Ireland | |||||||
| Prothena Biosciences Inc | Delaware | |||||||
| Prothena Finance Inc | Delaware | |||||||
| Othair Prothena Limited | Ireland | |||||||
| Prothena Pharma Limited | Ireland | |||||||
| Prothena Platform Technologies Limited | Ireland | |||||||