PROTHENA CORP PLC

Ticker: PRTA CUSIP: G72800108 Class: Common Stock

LOOMIS SAYLES & CO L P's Holding History (CIK: 0000312348)

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

Q3 2017

Shares 334,381 Value ($000) $21,658 Avg Close $61.26 Range $52.91 - $70.00

Q2 2017

Shares 334,914 Value ($000) $18,125 Avg Close $53.29 Range $48.23 - $59.10

Q1 2017

Shares 327,775 Value ($000) $18,287 Avg Close $52.54 Range $45.13 - $63.14

Q4 2016

Shares 195,970 Value ($000) $9,640 Avg Close $55.18 Range $40.58 - $68.18

Period	Shares	Value ($000)	Average Close	Price Range
Q3 2017	334,381	$21,658	$61.26	$52.91 - $70.00
Q2 2017	334,914	$18,125	$53.29	$48.23 - $59.10
Q1 2017	327,775	$18,287	$52.54	$45.13 - $63.14
Q4 2016	195,970	$9,640	$55.18	$40.58 - $68.18