Prothena Corp Public Ltd Co

PRTA

Exchange: Nasdaq
Industry: Pharmaceutical Preparations
SEC CIK: 0001559053

SEC filings (opens in a new tab)

In the last 90 days, Prothena Corp Public Ltd Co insiders filed 6 open-market purchases and 2 sales; 187 institutions reported holding it in 13F filings for Q2 2026, worth $462.7M in total; no superinvestor holds it.

Q3 2024 vs. Q2 2024

How the institutions holding Prothena Corp Public Ltd Co changed between Q2 2024 and Q3 2024.

All holders in Q3 2024 All holders in Q2 2024

13F holders of PRTA: Q2 2024 compared with Q3 2024
Measure	Q2 2024	Of which not filed for Q3 2024	Q3 2024	Change
Holders	160	1	164	+5
Shares	50.8M	3.86M	51.0M	+4.02M (+8.6%)
Value	$1.05B	$79.6M	$855.8M	−$113.4M (−11.7%)

1 institution that held it in Q2 2024 haven't filed for Q3 2024 yet. Not filing isn't selling, so the changes leave them out.

New holders (24)

Institutions that held Prothena Corp Public Ltd Co at the end of Q3 2024 but not at the end of Q2 2024.

Institutions new to PRTA in Q3 2024
Institution	Shares	Value	% of portfolio
BlackRock, Inc.	4,028,387	$67.4M	0.00%
Siren, L.L.C.	1,099,840	$18.4M	0.92%
Deep Track Capital, LP	140,000	$2.34M	0.07%
Schonfeld Strategic Advisors LLC	62,272	$1.04M	0.01%
Duncan Williams Asset Management, LLC	48,749	$815.6K	0.45%
Capula Management Ltd	43,197	$722.7K	0.01%
Lazard Asset Management LLC	42,173	$705.0K	0.00%
Gsa Capital Partners LLP	28,941	$484.0K	0.04%
Sherbrooke Park Advisers LLC	27,582	$461.4K	0.11%
Dynamic Technology Lab Private Ltd	25,764	$432.0K	0.05%
Creative Planning	20,907	$349.8K	0.00%
American Century Companies Inc	18,302	$306.2K	0.00%
XTX Topco Ltd	15,564	$260.4K	0.02%
HSBC Holdings PLC	15,078	$245.0K	0.00%
Qube Research & Technologies Ltd	13,320	$222.8K	0.00%
Intech Investment Management LLC	12,555	$210.0K	0.00%
ProShare Advisors LLC	11,212	$187.6K	0.00%
Danske Bank A/S	1,400	$23.4K	0.00%
Aster Capital Management (DIFC) Ltd	355	$5.94K	0.00%
CVA Family Office, LLC	94	$1.57K	0.00%
Sterling Capital Management LLC	91	$1.52K	0.00%
Truvestments Capital LLC	68	$1.14K	0.00%
Bessemer Group Inc	55	$1.00K	0.00%
Hallmark Capital Management Inc	3	$50	0.00%

Sold out (19)

Institutions that held Prothena Corp Public Ltd Co at the end of Q2 2024 and filed for Q3 2024 without it.

Institutions that sold out of PRTA in Q3 2024
Institution	Shares, Q2 2024	Value, Q2 2024
Artal Group S.A.	1,001,360	$20.7M
ExodusPoint Capital Management, LP	47,107	$972.0K
Walleye Capital LLC	46,098	$951.5K
Guggenheim Capital LLC	43,248	$892.6K
Y-Intercept (Hong Kong) Ltd	21,351	$440.7K
Focused Wealth Management, Inc	20,129	$415.5K
HighTower Advisors, LLC	18,717	$386.0K
Fox Run Management, L.L.C.	18,591	$383.7K
Verition Fund Management LLC	15,757	$325.2K
NEOS Investment Management LLC	10,511	$216.9K
ADAR1 Capital Management, LLC	5,988	$123.6K
Pacer Advisors, Inc.	552	$11.4K
Clear Street Markets LLC	500	$10.0K
Kelly Financial Services LLC	182	$3.76K
Mather Group, LLC.	100	$2.48K
Parallel Advisors, LLC	29	$599
Global Retirement Partners, LLC	7	$144
Register Financial Advisors LLC	4	$83
Cypress Capital, LLC	2	$41

Not filed for Q3 2024 yet (1)

Institutions that held Prothena Corp Public Ltd Co at the end of Q2 2024 and haven't filed a 13F for Q3 2024. Not filing isn't selling, so they aren't counted as sold out.

Institutions holding PRTA in Q2 2024 that haven't filed for Q3 2024
Institution	Shares, Q2 2024	Value, Q2 2024
BlackRock Inc.	3,857,079	$79.6M