Company · Ownership research

PROTHENA CORP PUBLIC LTD CO PRTA

CIK 0001559053 · CUSIP G72800108

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP G72800108 (PRTA), not CUSIP G72800908 (PRTA), CUSIP G72800958 (PRTA), and does not merge CUSIPs.

This page lists the top 20 of 187 rows by value; the complete set is available through the API.

Some filings reported values in thousands; those figures were scaled ×1,000 to dollars.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	FMR LLC CIK 315066 · View history	$77.12M 7,901,218 shares	0.00%	0(0.00%)Unchanged	SEC filing ↗ Nov 13, 2025	▾
02	BlackRock, Inc. CIK 2012383 · View history	$35.12M 3,598,417 shares	0.00%	-340.98K(-8.70%)Reduced	SEC filing ↗ Nov 12, 2025	▾
03	VANGUARD GROUP INC CIK 102909 · View history	$20.01M 2,049,849 shares	0.00%	-126.38K(-5.80%)Reduced	SEC filing ↗ Nov 7, 2025	▾
04	ARMISTICE CAPITAL, LLC CIK 1601086 · View history	$17.80M 1,824,000 shares	0.56%	-412.00K(-18.40%)Reduced	SEC filing ↗ Nov 17, 2025	▾
05	Rubric Capital Management LP CIK 1687509 · View history	$15.03M 1,540,373 shares	0.20%	+1.54MNew	SEC filing ↗ Nov 14, 2025	▾
06	ADAR1 Capital Management, LLC CIK 1940272 · View history	$14.34M 1,469,098 shares	1.42%	-1.91M(-56.50%)Reduced	SEC filing ↗ Nov 14, 2025	▾
07	Palo Alto Investors LP CIK 1306923 · View history	$12.92M 1,324,028 shares	2.39%	+49.27K(+3.90%)Added	SEC filing ↗ Nov 14, 2025	▾
08	D. E. Shaw & Co., Inc. CIK 1009207 · View history	$12.84M 1,315,418 shares	0.01%	+923.92K(+236.00%)Added	SEC filing ↗ Nov 14, 2025	▾
09	ACADIAN ASSET MANAGEMENT LLC CIK 916542 · View history	$12.09M 1,239,242 shares	0.02%	+221.06K(+21.70%)Added	SEC filing ↗ Nov 13, 2025	▾
10	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$9.95M 1,019,483 shares	0.00%	+86.04K(+9.20%)Added	SEC filing ↗ Nov 12, 2025	▾
11	STATE STREET CORP CIK 93751 · View history	$8.79M 901,038 shares	0.00%	-103.96K(-10.30%)Reduced	SEC filing ↗ Nov 14, 2025	▾
12	JACOBS LEVY EQUITY MANAGEMENT, INC CIK 884414 · View history	$8.55M 876,528 shares	0.03%	+183.37K(+26.50%)Added	SEC filing ↗ Nov 17, 2025	▾
13	DIMENSIONAL FUND ADVISORS LP CIK 354204 · View history	$7.88M 806,988 shares	0.00%	-155.35K(-16.10%)Reduced	SEC filing ↗ Nov 12, 2025	▾
14	MORGAN STANLEY CIK 895421 · Amended · View history	$7.80M 799,674 shares	0.00%	-153.58K(-16.10%)Reduced	SEC filing ↗ May 27, 2026	▾
15	CITADEL ADVISORS LLC CIK 1423053 · View history	$7.49M 767,105 shares	0.01%	-380.52K(-33.20%)Reduced	SEC filing ↗ Nov 14, 2025	▾
16	JPMORGAN CHASE & CO CIK 19617 · Amended · View history	$7.18M 735,765 shares	0.00%	+608.81K(+479.60%)Added	SEC filing ↗ Nov 26, 2025	▾
17	FEDERATED HERMES, INC. CIK 1056288 · View history	$6.76M 692,818 shares	0.01%	-488.27K(-41.30%)Reduced	SEC filing ↗ Nov 3, 2025	▾
18	Nuveen, LLC CIK 1871926 · View history	$6.52M 668,290 shares	0.00%	+546.13K(+447.10%)Added	SEC filing ↗ Nov 12, 2025	▾
19	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP CIK 1164508 · View history	$6.39M 654,294 shares	0.00%	+654.29KNew	SEC filing ↗ Nov 13, 2025	▾
20	Point72 Asset Management, L.P. CIK 1603466 · View history	$6.31M 646,746 shares	0.01%	+646.75KNew	SEC filing ↗ Nov 14, 2025	▾

Showing 20 / 187 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

187

Cancelled or null records excluded

Disclosed shares

42,605,129

Not deduplicated across managers

Disclosed value

$415.81M

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

PROTHENA CORP PUBLIC LTD CO · Q3 2025

Explore all 187 reporting institutions.

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Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.