PROTHENA CORP PLC

Ticker: PRTA CUSIP: G72800108 Class: Common Stock

ARROWSTREET CAPITAL, LIMITED PARTNERSHIP's Holding History (CIK: 0001164508)

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

Q4 2025

Shares 298,101 Value ($000) $2,847 Avg Close $10.18 Range $9.07 - $11.69

Q3 2025

Shares 654,294 Value ($000) $6,386 Avg Close $7.69 Range $5.96 - $9.85

Q2 2020

Shares 42,255 Value ($000) $442 Avg Close $11.11 Range $9.25 - $12.98

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	298,101	$2,847	$10.18	$9.07 - $11.69
Q3 2025	654,294	$6,386	$7.69	$5.96 - $9.85
Q2 2020	42,255	$442	$11.11	$9.25 - $12.98