Question 1

Does Bank of New York Mellon own PRTA stock?

Accepted Answer

Yes. As of its Q3 2026 13F, Bank of New York Mellon holds 134,790 shares of PRTA (Prothena), worth $1.1M.

Question 2

How many shares of PRTA does Bank of New York Mellon own?

Accepted Answer

As of its Q3 2026 13F, Bank of New York Mellon holds 134,790 shares of PRTA (Prothena).

Question 3

What is Bank of New York Mellon's PRTA position worth?

Accepted Answer

As of its Q3 2026 13F, Bank of New York Mellon's PRTA position is worth $1.1M.

Question 4

Is Bank of New York Mellon buying or selling PRTA?

Accepted Answer

In Q3 2026, Bank of New York Mellon increased its PRTA position by 884 shares (+0.7%).

Question 5

When did Bank of New York Mellon first buy PRTA?

Accepted Answer

Bank of New York Mellon already held PRTA in its Q3 2019 13F, the earliest on record, and has listed it in 29 quarterly 13F filings.

Quarter	Action	Shares	Change	Value	Weight	Price	Conviction
2026-Q3 Latest	Increased	134,790	+0.7%	$1.1M	0.0%	$8.38	25
2026-Q2	Decreased	133,906	-1.8%	$1.3M	0.0%	$9.79	0
2026-Q1	Increased	136,322	+2.7%	$1.3M	0.0%	$9.72	26
2025-Q4	Decreased	132,700	-13.7%	$1.3M	0.0%	$9.55	0
2025-Q3	Increased	153,800	+3.7%	$1.5M	0.0%	$9.76	26
2025-Q2	Increased	148,350	+1.6%	$900,486	0.0%	$6.07	25
2025-Q1	Decreased	146,009	-2.8%	$1.8M	0.0%	$12.38	0
2024-Q4	Increased	150,238	+14.9%	$2.1M	0.0%	$13.85	30
2024-Q3	Decreased	130,786	-20.9%	$2.2M	0.0%	$16.73	0