PROTHENA CORP PUBLIC LTD CO — Director's Dealing 2017

May 19, 2017

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Prothena Corp plc (PRTA)
CIK: 0001559053
Period of Report: 2017-05-18

Reporting Person: Harfstrand Karl Anders Olof (Director)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2017-05-18	Stock Option (right to buy)	$56.23	A	12000	Acquired	2027-05-18	Ordinary Shares (12000)	Direct

Footnotes

F1: 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 prior to the annual general meeting in 2018 of the Issuer's shareholders, assuming continuous service as a director until such vesting date.