PROTHENA CORP PLC

Ticker: PRTA CUSIP: G72800108 Class: Common Stock

Headlands Technologies LLC's Holding History (CIK: 0001570271)

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

Q4 2025

Shares 23,352 Value ($000) $223 Avg Close $10.18 Range $9.07 - $11.69

Q4 2024

Shares 7,330 Value ($000) $102 Avg Close $15.77 Range $11.70 - $18.88

Q3 2024

Shares 2,472 Value ($000) $41 Avg Close $21.50 Range $15.52 - $25.42

Q2 2024

Shares 1,675 Value ($000) $35 Avg Close $21.64 Range $18.69 - $26.36

Q1 2024

Shares 3,881 Value ($000) $96 Avg Close $29.75 Range $24.25 - $41.55

Q3 2023

Shares 1,531 Value ($000) $74 Avg Close $59.41 Range $45.22 - $73.14

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	23,352	$223	$10.18	$9.07 - $11.69
Q4 2024	7,330	$102	$15.77	$11.70 - $18.88
Q3 2024	2,472	$41	$21.50	$15.52 - $25.42
Q2 2024	1,675	$35	$21.64	$18.69 - $26.36
Q1 2024	3,881	$96	$29.75	$24.25 - $41.55
Q3 2023	1,531	$74	$59.41	$45.22 - $73.14