PROTHENA CORP PLC

Ticker: PRTA CUSIP: G72800108 Class: Common Stock

Caption Management, LLC's Holding History (CIK: 0001706766)

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

Q4 2025

Shares 61,009 Value ($000) $583 Avg Close $10.18 Range $9.07 - $11.69

Q3 2025

Shares 61,009 Value ($000) $595 Avg Close $7.69 Range $5.96 - $9.85

Q2 2025

Shares 65,100 Value ($000) $395 Avg Close $7.50 Range $4.32 - $12.45

Q4 2024

Shares 24,000 Value ($000) $332 Avg Close $15.77 Range $11.70 - $18.88

Q4 2023

Shares 45,892 Value ($000) $1,668 Avg Close $38.49 Range $28.51 - $55.89

Q1 2021

Shares 21,000 Value ($000) $528 Avg Close $18.81 Range $10.72 - $28.66

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	61,009	$583	$10.18	$9.07 - $11.69
Q3 2025	61,009	$595	$7.69	$5.96 - $9.85
Q2 2025	65,100	$395	$7.50	$4.32 - $12.45
Q4 2024	24,000	$332	$15.77	$11.70 - $18.88
Q4 2023	45,892	$1,668	$38.49	$28.51 - $55.89
Q1 2021	21,000	$528	$18.81	$10.72 - $28.66