Question 1

How many shares of PRTA does MASSACHUSETTS FINANCIAL SERVICES CO /MA/ own?

Accepted Answer

As of 2026-Q2, MASSACHUSETTS FINANCIAL SERVICES CO /MA/ holds 126,990 shares of PRTA (PROTHENA CORP PLC).

Question 2

What is MASSACHUSETTS FINANCIAL SERVICES CO /MA/'s PRTA position worth?

Accepted Answer

As of 2026-Q2, MASSACHUSETTS FINANCIAL SERVICES CO /MA/'s PRTA position is worth $1.2M.

Question 3

Is MASSACHUSETTS FINANCIAL SERVICES CO /MA/ buying or selling PRTA?

Accepted Answer

In 2026-Q2, MASSACHUSETTS FINANCIAL SERVICES CO /MA/ decreased their PRTA position (-3.8% change in shares).

Question 4

When did MASSACHUSETTS FINANCIAL SERVICES CO /MA/ first buy PRTA?

Accepted Answer

Based on available 13F filings, MASSACHUSETTS FINANCIAL SERVICES CO /MA/ first reported a position in PRTA in 2024-Q4. They have held the position across 15 quarters.

Quarter	Action	Shares	Change	Value	Weight	Price	Conviction
2026-Q2 Latest	Decreased	126,990	-3.8%	$1.2M	0.0%	$9.79	0
2026-Q1	Increased	132,051	+187.3%	$1.3M	0.0%	$9.36	41
2025-Q4	Decreased	45,970	-3.2%	$439,013	0.0%	$9.31	0
2025-Q3	Increased	47,489	+7.0%	$463,493	0.0%	$9.76	26
2025-Q2	Increased	44,364	+1.3%	$269,289	0.0%	$6.08	23
2025-Q1	Decreased	43,816	-2.2%	$542,223	0.0%	$13.14	0
2024-Q4	New	44,815	—	$620,688	0.0%	$14.88	34