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.

Q2 2021 vs. Q1 2021

How the institutions holding Prothena Corp Public Ltd Co changed between Q1 2021 and Q2 2021.

All holders in Q2 2021 All holders in Q1 2021

13F holders of PRTA: Q1 2021 compared with Q2 2021
Measure	Q1 2021	Q2 2021	Change
Holders	146	156	+10
Shares	40.0M	40.4M	+429.9K (+1.1%)
Value	$1.00B	$2.08B	+$1.07B (+106.8%)

New holders (34)

Institutions that held Prothena Corp Public Ltd Co at the end of Q2 2021 but not at the end of Q1 2021.

Institutions new to PRTA in Q2 2021
Institution	Shares	Value	% of portfolio
Adage Capital Partners GP, L.L.C.	200,000	$10.3M	0.02%
Avidity Partners Management LP	182,000	$9.36M	0.25%
Point72 Asset Management, L.P.	168,800	$8.68M	0.04%
Perceptive Advisors LLC	100,000	$5.14M	0.07%
Handelsbanken Fonder AB	99,700	$5.13M	0.03%
Voloridge Investment Management, LLC	75,661	$3.89M	0.03%
Hillsdale Investment Management Inc.	51,800	$2.66M	0.21%
Federated Hermes, Inc.	43,671	$2.25M	0.00%
Tudor Investment Corp Et Al	40,059	$2.06M	0.04%
Birchview Capital, LP	30,247	$1.55M	0.93%
Virtu Financial LLC	11,174	$574.0K	0.06%
Engineers Gate Manager LP	10,810	$556.0K	0.04%
Arizona State Retirement System	7,592	$390.0K	0.00%
Trexquant Investment LP	7,326	$377.0K	0.03%
Amalgamated Bank	6,060	$312.0K	0.00%
Hunter Perkins Capital Management, LLC	5,800	$298.0K	0.06%
Gotham Asset Management, LLC	5,337	$274.0K	0.01%
State of Wyoming	5,248	$270.0K	0.17%
Maven Securities LTD	5,000	$257.0K	0.03%
AQR Capital Management LLC	4,917	$253.0K	0.00%
Wetherby Asset Management Inc	4,647	$239.0K	0.01%
Vident Investment Advisory, LLC	4,389	$226.0K	0.01%
Brighton Jones LLC	4,000	$206.0K	0.01%
Raymond James & Associates	3,900	$200.0K	0.00%
Meeder Asset Management Inc	1,594	$82.0K	0.00%
STRS Ohio	1,100	$56.0K	0.00%
Mirae Asset Global Investments Co., Ltd.	718	$37.0K	0.00%
Tarbox Family Office, Inc.	295	$15.0K	0.00%
Albion Financial Group	125	$6.00K	0.00%
TCI Wealth Advisors, Inc.	94	$5.00K	0.00%
Rockbridge Investment Management, LCC	100	$5.00K	0.00%
Geneos Wealth Management Inc.	26	$1.00K	0.00%
TD Private Client Wealth LLC	12	$617	0.00%
TD Capital Management LLC	1	$0	0.00%

Sold out (24)

Institutions that held Prothena Corp Public Ltd Co at the end of Q1 2021 and filed for Q2 2021 without it.

Institutions that sold out of PRTA in Q2 2021
Institution	Shares, Q1 2021	Value, Q1 2021
Ikarian Capital, LLC	437,430	$11.0M
Jacobs Levy Equity Management, Inc	313,851	$7.88M
Hudson Bay Capital Management LP	70,000	$1.76M
Eversept Partners, LP	68,575	$1.72M
Acadian Asset Management LLC	66,043	$1.66M
Russell Investments Group, Ltd.	65,119	$1.63M
California Public Employees Retirement System	62,500	$1.57M
Citadel Advisors LLC	56,273	$1.41M
Boothbay Fund Management, LLC	48,162	$1.21M
Marshall Wace North America L.P.	30,601	$769.0K
Walleye Trading LLC	23,587	$593.0K
Marshall Wace, LLP	23,553	$591.0K
SG3 Management, LLC	22,500	$565.0K
Caption Management, LLC	21,000	$528.0K
Ameriprise Financial Inc	17,792	$447.0K
Connacht Asset Management LP	15,313	$385.0K
Belvedere Trading LLC	14,584	$366.0K
Natixis Advisors, L.P.	12,972	$325.0K
Metropolitan Life Insurance Co	9,566	$240.3K
Group One Trading, L.P.	7,550	$190.0K
Quantbot Technologies LP	2,451	$61.0K
Bank of Montreal	2,300	$54.0K
Spire Wealth Management	1,068	$29.0K
Pacer Advisors, Inc.	952	$24.0K