Who owns PRTAWhat PRTA owns — n/a

Who owns PROTHENA CORP PUBLIC LTD CO?

Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from company filings.

Institutional ownership of PRTA from SEC Form 13F filings across 245 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.

As of the 2026-06-30 reporting period, 245 institutions disclosed 57.2M shares of PROTHENA CORP PUBLIC LTD CO worth $498.0M; the largest disclosed holder is BlackRock Inc.. Source: SEC Form 13F filings, parsed by EvidInvest.

245

13F holders

$498.0M

value, 2026 filers

57.2M

shares disclosed

new positions (2026 filers)

Top institutional holders

ordered by shares owned · positions as of 2026-06-30 · % of fund = share of the manager's own book · % of co. = share of PRTA's shares outstanding

#	Manager	Shares	Value	% of fund	% of co.	Δ shares QoQ
1	BlackRock Inc.	3.9M	$79.6M	0.0%	—	—
2	BlackRock Fund Advisors	1.5M	$74.5M	0.0%	—	—
3	FMR LLC	7.6M	$73.4M	0.0%	—	—
4	QUADRANT CAPITAL GROUP LLC	841	$49.0M	0.0%	—	—
5	Rubric Capital Management LP	5.0M	$48.6M	0.5%	—	—
6	BlackRock, Inc.	4.6M	$45.1M	0.0%	—	—
7	BlackRock Institutional Trust Company, N.A.	872,281	$42.9M	0.0%	—	—
8	VANGUARD GROUP INC	2.1M	$20.4M	0.0%	—	—
9	STATE STREET CORP	1.9M	$18.8M	0.0%	—	—
10	D. E. Shaw & Co., Inc.	1.8M	$17.1M	0.0%	—	—
11	ADAR1 Capital Management, LLC	1.6M	$15.4M	0.9%	—	—
12	ACADIAN ASSET MANAGEMENT LLC	1.5M	$15.0M	0.0%	—	—
13	MORGAN STANLEY	1.2M	$12.0M	0.0%	—	—
14	Palo Alto Investors LP	1.2M	$11.7M	1.8%	—	—
15	TWO SIGMA INVESTMENTS, LP	1.2M	$11.7M	0.0%	—	—
16	Boxer Capital, LLC	690,000	$11.5M	0.6%	—	—
17	GEODE CAPITAL MANAGEMENT, LLC	1.1M	$10.7M	0.0%	—	—
18	FEDERATED HERMES, INC.	1.1M	$10.3M	0.0%	—	—
19	JACOBS LEVY EQUITY MANAGEMENT, INC	972,017	$9.4M	0.0%	—	—
20	GOLDMAN SACHS GROUP INC	818,885	$8.0M	0.0%	—	—
21	DIMENSIONAL FUND ADVISORS LP	782,603	$7.6M	0.0%	—	—
22	Nuveen, LLC	759,368	$7.4M	0.0%	—	—
23	BlackRock Investment Management, LLC	132,680	$6.5M	0.0%	—	—
24	Qube Research & Technologies Ltd	614,603	$6.0M	0.0%	—	—
25	RENAISSANCE TECHNOLOGIES LLC	607,515	$5.9M	0.0%	—	—

Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.