Question 1

Does Massachusetts Financial Services own PRTA stock?

Accepted Answer

Yes. As of its Q2 2026 13F, Massachusetts Financial Services holds 126,990 shares of PRTA (Prothena), worth $1.2M.

Question 2

How many shares of PRTA does Massachusetts Financial Services own?

Accepted Answer

As of its Q2 2026 13F, Massachusetts Financial Services holds 126,990 shares of PRTA (Prothena).

Question 3

What is Massachusetts Financial Services' PRTA position worth?

Accepted Answer

As of its Q2 2026 13F, Massachusetts Financial Services' PRTA position is worth $1.2M.

Question 4

Is Massachusetts Financial Services buying or selling PRTA?

Accepted Answer

In Q2 2026, Massachusetts Financial Services reduced its PRTA position by 5,061 shares (-3.8%).

Question 5

When did Massachusetts Financial Services first buy PRTA?

Accepted Answer

Massachusetts Financial Services first reported PRTA in its Q3 2020 13F and has listed it in 14 quarterly 13F filings.

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%	$9.72	41
2025-Q4	Decreased	45,970	-3.2%	$439,013	0.0%	$9.55	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%	$6.07	23
2025-Q1	Decreased	43,816	-2.2%	$542,223	0.0%	$12.38	0
2024-Q4	New	44,815	—	$620,688	0.0%	$13.85	34