Question 1

Does Marshall Wace own PRTA stock?

Accepted Answer

Yes. As of its Q2 2026 13F, Marshall Wace holds 190,834 shares of PRTA (Prothena), worth $1.9M.

Question 2

How many shares of PRTA does Marshall Wace own?

Accepted Answer

As of its Q2 2026 13F, Marshall Wace holds 190,834 shares of PRTA (Prothena).

Question 3

What is Marshall Wace's PRTA position worth?

Accepted Answer

As of its Q2 2026 13F, Marshall Wace's PRTA position is worth $1.9M.

Question 4

Is Marshall Wace buying or selling PRTA?

Accepted Answer

In Q2 2026, Marshall Wace increased its PRTA position from 44,574 to 190,834 shares.

Question 5

When did Marshall Wace first buy PRTA?

Accepted Answer

Marshall Wace first reported PRTA in its Q2 2019 13F and has listed it in 12 quarterly 13F filings.

Quarter	Action	Shares	Change	Value	Weight	Price	Conviction
2026-Q2 Latest	Increased	190,834	+328.1%	$1.9M	0.0%	$9.79	42
2026-Q1	Decreased	44,574	-18.6%	$433,257	0.0%	$9.72	0
2025-Q4	New	54,778	—	$523,130	0.0%	$9.55	33