PROTHENA CORP PLC

Ticker: PRTA CUSIP: G72800108 Class: Common Stock

Atika Capital Management LLC's Holding History (CIK: 0001599731)

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

Q2 2023

Shares 97,500 Value ($000) $6,657 Avg Close $64.50 Range $47.45 - $79.65

Q1 2023

Shares 48,578 Value ($000) $2,355 Avg Close $52.83 Range $45.06 - $60.82

Q4 2022

Shares 91,178 Value ($000) $5,493 Avg Close $58.56 Range $50.89 - $66.47

Q3 2021

Shares 224,600 Value ($000) $15,999 Avg Close $62.11 Range $45.09 - $79.75

Q2 2021

Shares 234,000 Value ($000) $12,030 Avg Close $31.20 Range $21.30 - $59.74

Q1 2021

Shares 17,906 Value ($000) $450 Avg Close $18.81 Range $10.72 - $28.66

Q4 2015

Shares 15,000 Value ($000) $1,021 Avg Close $60.32 Range $40.47 - $76.42

Q1 2014

Shares 57,500 Value ($000) $2,203 Avg Close $32.24 Range $24.42 - $49.24

Q4 2013

Shares 37,500 Value ($000) $995 Avg Close $25.08 Range $18.93 - $30.55

Period	Shares	Value ($000)	Average Close	Price Range
Q2 2023	97,500	$6,657	$64.50	$47.45 - $79.65
Q1 2023	48,578	$2,355	$52.83	$45.06 - $60.82
Q4 2022	91,178	$5,493	$58.56	$50.89 - $66.47
Q3 2021	224,600	$15,999	$62.11	$45.09 - $79.75
Q2 2021	234,000	$12,030	$31.20	$21.30 - $59.74
Q1 2021	17,906	$450	$18.81	$10.72 - $28.66
Q4 2015	15,000	$1,021	$60.32	$40.47 - $76.42
Q1 2014	57,500	$2,203	$32.24	$24.42 - $49.24
Q4 2013	37,500	$995	$25.08	$18.93 - $30.55