PROTHENA CORP PLC

Ticker: PRTA CUSIP: G72800108 Class: Common Stock

DEERFIELD MANAGEMENT COMPANY, L.P.'s Holding History (CIK: 0001009258)

Note: Option positions (PUT/CALL) are excluded.

Q2 2018

Shares 628,262 Value ($000) $9,160 Avg Close $19.75 Range $10.43 - $44.75

Q3 2014

Shares 27,500 Value ($000) $609 Avg Close $21.20 Range $16.71 - $24.31

Q2 2014

Shares 20,000 Value ($000) $451 Avg Close $25.01 Range $18.52 - $41.33

Q4 2013

Shares 528,705 Value ($000) $14,021 Avg Close $25.08 Range $18.93 - $30.55

Period	Shares	Value ($000)	Average Close	Price Range
Q2 2018	628,262	$9,160	$19.75	$10.43 - $44.75
Q3 2014	27,500	$609	$21.20	$16.71 - $24.31
Q2 2014	20,000	$451	$25.01	$18.52 - $41.33
Q4 2013	528,705	$14,021	$25.08	$18.93 - $30.55