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 2021 vs. Q2 2021

How the institutions holding Prothena Corp Public Ltd Co changed between Q2 2021 and Q3 2021.

All holders in Q3 2021 All holders in Q2 2021

13F holders of PRTA: Q2 2021 compared with Q3 2021
Measure	Q2 2021	Of which not filed for Q3 2021	Q3 2021	Change
Holders	156	1	192	+37
Shares	40.4M	32	40.9M	+504.5K (+1.2%)
Value	$2.08B	$2.00K	$2.92B	+$837.8M (+40.3%)

1 institution that held it in Q2 2021 haven't filed for Q3 2021 yet. Not filing isn't selling, so the changes leave them out.

New holders (50)

Institutions that held Prothena Corp Public Ltd Co at the end of Q3 2021 but not at the end of Q2 2021.

Institutions new to PRTA in Q3 2021
Institution	Shares	Value	% of portfolio
Boxer Capital, LLC	300,000	$21.4M	0.75%
Citadel Advisors LLC	103,505	$7.37M	0.01%
Marshall Wace, LLP	68,892	$4.91M	0.02%
Granahan Investment Management Inc	45,304	$3.23M	0.06%
State of New Jersey Common Pension Fund D	44,541	$3.17M	0.01%
Jacobs Levy Equity Management, Inc	43,227	$3.08M	0.02%
ETF Managers Group, LLC	43,230	$3.06M	0.06%
Marshall Wace North America L.P.	34,755	$2.47M	0.01%
Syntal Capital Partners, LLC	33,615	$2.39M	0.83%
Jump Financial, LLC	27,800	$1.98M	0.14%
Bank of Montreal	21,525	$1.56M	0.00%
M&G Investment Management Ltd	20,004	$1.42M	0.01%
Advisory Research Inc	19,684	$1.40M	0.09%
Alpha DNA Investment Management LLC	19,389	$1.38M	0.97%
Bellwether Advisors, LLC	17,846	$1.27M	0.42%
Robeco Institutional Asset Management B.V.	16,960	$1.21M	0.00%
Seven Eight Capital, LP	14,800	$1.05M	0.10%
Jennison Associates LLC	14,271	$1.02M	0.00%
Jane Street Group, LLC	12,949	$922.0K	0.00%
Franklin Resources Inc	9,635	$686.0K	0.00%
Metropolitan Life Insurance Co	9,280	$661.0K	0.01%
Ameriprise Financial Inc	9,123	$650.0K	0.00%
AE Wealth Management LLC	8,670	$618.0K	0.01%
Campbell & CO Investment Adviser LLC	8,400	$598.0K	0.19%
Harvest Investment Services, LLC	7,228	$514.0K	0.21%
Navellier & Associates Inc	7,180	$511.0K	0.08%
Connor, Clark & Lunn Investment Management Ltd.	6,690	$477.0K	0.00%
Teacher Retirement System of Texas	4,809	$343.0K	0.00%
Oppenheimer & Co Inc	4,763	$339.0K	0.01%
PDT Partners, LLC	4,420	$315.0K	0.02%
Xcel Wealth Management, LLC	4,000	$285.0K	0.08%
Victory Capital Management Inc	3,913	$279.0K	0.00%
Schonfeld Strategic Advisors LLC	3,765	$269.0K	0.00%
Gsa Capital Partners LLP	3,611	$257.0K	0.03%
Russell Investments Group, Ltd.	3,496	$249.0K	0.00%
Meristem Family Wealth, LLC	3,290	$234.0K	0.02%
Summit Trail Advisors, LLC	3,000	$214.0K	0.02%
O'Shaughnessy Asset Management, LLC	2,048	$146.0K	0.00%
Group One Trading, L.P.	1,937	$138.0K	0.00%
Macquarie Group Ltd	1,548	$110.0K	0.00%
Acadian Asset Management LLC	1,430	$101.0K	0.00%
Walleye Trading LLC	1,329	$95.0K	0.00%
Lazard Asset Management LLC	918	$65.0K	0.00%
Quantbot Technologies LP	600	$42.0K	0.00%
Macroview Investment Management LLC	131	$9.00K	0.01%
Spire Wealth Management	103	$7.00K	0.00%
Hudock, Inc.	28	$1.00K	0.00%
Patriot Financial Group Insurance Agency, LLC	4	$0	0.00%
Investors Research Corp	4	$0	0.00%
Gerber Kawasaki Wealth & Investment Management	1	–	–

Sold out (13)

Institutions that held Prothena Corp Public Ltd Co at the end of Q2 2021 and filed for Q3 2021 without it.

Institutions that sold out of PRTA in Q3 2021
Institution	Shares, Q2 2021	Value, Q2 2021
Avidity Partners Management LP	182,000	$9.36M
AXA S.A.	79,660	$4.09M
ClariVest Asset Management LLC	28,733	$1.48M
Squarepoint Ops LLC	25,886	$1.33M
Wellington Management Group LLP	23,821	$1.22M
Virtu Financial LLC	11,174	$574.0K
Trexquant Investment LP	7,326	$377.0K
Maven Securities LTD	5,000	$257.0K
Vident Investment Advisory, LLC	4,389	$226.0K
Panagora Asset Management Inc	3,323	$171.0K
Mirae Asset Global Investments Co., Ltd.	718	$37.0K
Whittier Trust Co	220	$11.0K
IFP Advisors, Inc	20	$1.00K

Not filed for Q3 2021 yet (1)

Institutions that held Prothena Corp Public Ltd Co at the end of Q2 2021 and haven't filed a 13F for Q3 2021. Not filing isn't selling, so they aren't counted as sold out.

Institutions holding PRTA in Q2 2021 that haven't filed for Q3 2021
Institution	Shares, Q2 2021	Value, Q2 2021
CWM, LLC	32	$2.00K