Prothena Corp Public PRTA Institutional Ownership

NASDAQ PRTA

$9.82 +0.22 (+2.29%)

As of: Sep 4, 2026 · 3:59 PM EDT

Institutions by Trading Activity

189 Institutions

Increased 85 45.0%

Unchanged 45 23.8%

Reduced 59 31.2%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

91.16%

▲+3.60 pp QoQ

Shares Held by Institutions

47.54Mn

of 52.15Mn outstanding

▲+4.72% QoQ

Shares Outstanding

52.15Mn

4.61Mn held outside 13F filers

Institutional Investors

189

filed 13F for Jun 2026

▲+4 vs prior quarter

Net Shares Added (QoQ)

+2.14Mn

accumulated since last quarter

Value of Holdings

$456.36Mn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Quarter ending 30 Jun, 2026

Prothena Corp Public Ltd Co (NASDAQ:PRTA) is held by 189 institutional investors per 13F filings through June 2026.

They owned 91.2% of outstanding stock in June 2026, up from 87.6% the prior quarter.
They increased total shares held in PRTA by 4.72% quarter over quarter, and investors in Prothena Corp Public increased 0.53% from a year ago.
Of these 189 holders, 85 added to their stakes in Prothena Corp Public, 59 trimmed positions, and 45 made no changes.
In total, institutional investors held 47.54Mn shares in Prothena Corp Public as of June 2026, up by 2.14Mn shares quarter on quarter, and up 7.3Mn shares year over year.
FMR LLC holds the largest position in PRTA at 7.2Mn shares as of June 30, 2026, or 13.81% of shares outstanding.
Top purchasers of PRTA stock for the quarter ending June 2026 included ACADIAN ASSET MANAGEMENT LLC (463.05K), State Street Corp (454.93K), Sixth Street Partners Management Company, L.P. (355.9K), Man Group plc (296.54K), MACKENZIE FINANCIAL CORP (239.9K).
Leading sellers of Prothena Corp Public shares for the quarter ending June 2026 were FMR LLC (352.0K), Morgan Stanley (235.1K), Nuveen, LLC (202.21K), Bank Of America Corp /De/ (185.39K), MONIMUS CAPITAL MANAGEMENT, LP (156.56K).
Prothena Corp Public's 10 largest shareholders as of June 2026 include FMR LLC (7.2Mn), Rubric Capital Management LP (5.0Mn), BlackRock, Inc. (4.87Mn), State Street Corp (2.39Mn), ACADIAN ASSET MANAGEMENT LLC (2.01Mn), VANGUARD PORTFOLIO MANAGEMENT LLC (1.65Mn), D. E. Shaw & Co., Inc. (1.61Mn), ADAR1 Capital Management, LLC (1.55Mn), TWO SIGMA INVESTMENTS, LP (1.26Mn), Palo Alto Investors LP (1.14Mn) per Business Quant data.

Form 13F Holdings

189 Institutional Holders

Report period 30 Jun, 2026

Total shares held 47.54Mn

Of outstanding 91.16%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	FMR LLC	0000315066	7,199,218	13.81%	▼352,000	-4.66%	$70.48Mn
2	Rubric Capital Management LP	0001687509	5,000,000	9.59%	0	0.00%	$48.95Mn
3	BlackRock, Inc.	0002012383	4,867,955	9.34%	▲223,795	+4.82%	$47.66Mn
4	State Street Corp	0000093751	2,393,424	4.59%	▲454,926	+23.47%	$23.43Mn
5	ACADIAN ASSET MANAGEMENT LLC	0000916542	2,010,645	3.86%	▲463,052	+29.92%	$19.68K
6	VANGUARD PORTFOLIO MANAGEMENT LLC	0002100121	1,651,293	3.17%	▲205,314	+14.20%	$16.17Mn
7	D. E. Shaw & Co., Inc.	0001009207	1,611,457	3.09%	▼151,890	-8.61%	$15.78Mn
8	ADAR1 Capital Management, LLC	0001940272	1,554,535	2.98%	▼26,908	-1.70%	$15.22Mn
9	TWO SIGMA INVESTMENTS, LP	0001179392	1,264,987	2.43%	▲59,009	+4.89%	$12.38Mn
10	Palo Alto Investors LP	0001306923	1,143,155	2.19%	▼65,413	-5.41%	$11.19Mn
11	GEODE CAPITAL MANAGEMENT, LLC	0001214717	1,125,877	2.16%	▲27,711	+2.52%	$11.02Mn
12	Federated Hermes, Inc.	0001056288	1,084,401	2.08%	▲24,552	+2.32%	$10.62Mn
13	Morgan Stanley	0000895421	995,348	1.91%	▼235,100	-19.11%	$9.74Mn
14	Goldman Sachs Group Inc	0000886982	979,730	1.88%	▲160,845	+19.64%	$9.59Mn
15	JACOBS LEVY EQUITY MANAGEMENT, INC	0000884414	965,988	1.85%	▼6,029	-0.62%	$9.46Mn
16	DIMENSIONAL FUND ADVISORS LP	0000354204	905,651	1.74%	▲123,048	+15.72%	$8.87Mn
17	Qube Research & Technologies Ltd	0001729829	791,169	1.52%	▲176,566	+28.73%	$7.75Mn
18	RENAISSANCE TECHNOLOGIES LLC	0001037389	697,615	1.34%	▲90,100	+14.83%	$6.83Mn
19	Man Group plc	0001637460	678,116	1.30%	▲296,542	+77.72%	$6.64Mn
20	Mariner, LLC	0001373442	625,095	1.20%	▲62,013	+11.01%	$6.12Mn

Showing 1 to 20 of 189 holders