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Prothena (PRTA) Institutional Ownership

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$6.81 -0.06 (-0.87%)
Closing price 08/1/2025 04:00 PM Eastern
Extended Trading
$6.80 0.00 (-0.07%)
As of 08/1/2025 06:04 PM Eastern
Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Polygon.io. Learn more.
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Institutional Ownership Changes (13F Filings) for Prothena (NASDAQ:PRTA)

Current
Institutional Ownership
Percentage
97.08%
Number of
Institutional Buyers
(last 12 months)
75
Total
Institutional Inflows
(last 12 months)
$107.58M
Number of
Institutional Sellers
(last 12 months)
42
Total
Institutional Outflows
(last 12 months)
$45.02M
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PRTA Institutional Buying and Selling by Quarter

Prothena Major Shareholders & Ownership History

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Reporting DateMajor Shareholder NameShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails
8/1/2025Purkiss Capital Advisors LLC24,904$151K0.1%+15.1%0.046%
7/29/2025 Nordea Investment Management AB311,605$1.92M0.0%+1.2%0.579%
7/15/2025 Public Employees Retirement System of Ohio42,158$256K0.0%N/A0.078%
7/10/2025 Mogy Joel R Investment Counsel Inc.20,750$126K0.0%N/A0.039%
6/27/2025Goldman Sachs Group Inc.510,462$6.32M0.0%-8.3%0.948%
5/23/2025Siren L.L.C.1,283,555$15.88M0.9%+16.7%2.385%
5/16/2025Goldman Sachs Group Inc.510,462$6.32M0.0%-8.3%0.948%
5/16/2025Jacobs Levy Equity Management Inc.18,553$230K0.0%N/A0.034%
5/15/2025Birchview Capital LP332,974$4.12M3.5%+9.3%0.619%
5/15/2025Palo Alto Investors LP1,659,734$20.54M3.9%-4.5%3.083%
5/15/2025PDT Partners LLC150,316$1.86M0.1%+18.2%0.279%
5/15/2025Armistice Capital LLC2,196,000$27.18M0.4%-1.8%4.080%
5/15/2025Siren L.L.C.1,283,555$15.88M0.9%+16.7%2.385%
5/14/2025Rafferty Asset Management LLC43,978$544K0.0%-43.4%0.082%
5/14/2025Price T Rowe Associates Inc. MD3,455,856$42.77M0.0%-6.2%6.420%
5/14/2025Hsbc Holdings PLC13,088$160K0.0%-45.9%0.024%
5/14/2025Wellington Management Group LLP5,199,528$64.34M0.0%+1.3%9.660%
5/13/2025Cresset Asset Management LLC13,125$162K0.0%-32.5%0.024%
5/13/2025American Century Companies Inc.34,836$431K0.0%+14.6%0.065%
5/12/2025Nuveen LLC149,961$1.86M0.0%N/A0.279%
5/12/2025Invesco Ltd.37,638$466K0.0%-12.2%0.070%
5/9/2025 Chicago Partners Investment Group LLC14,512$180K0.0%+29.6%0.027%
5/9/2025Charles Schwab Investment Management Inc.319,607$3.96M0.0%-2.3%0.594%
5/9/2025DCF Advisers LLC195,000$2.41M1.2%+88.4%0.362%
5/8/2025Federated Hermes Inc.546,255$6.76M0.0%-26.8%1.015%
5/7/2025Purkiss Capital Advisors LLC21,629$268K0.2%+101.6%0.040%
5/7/2025 TD Asset Management Inc62,694$776K0.0%-3.1%0.116%
5/6/2025Pinnacle Associates Ltd.100,259$1.24M0.0%-2.7%0.186%
5/6/2025 KLP Kapitalforvaltning AS6,700$83K0.0%-48.1%0.012%
4/30/2025Alps Advisors Inc.37,956$470K0.0%-12.8%0.071%
4/29/2025Bank of New York Mellon Corp146,009$1.81M0.0%-2.8%0.271%
4/24/2025 HighMark Wealth Management LLC2,018$25K0.0%-81.9%0.004%
4/22/2025 Cambridge Investment Research Advisors Inc.10,164$126K0.0%N/A0.019%
4/21/2025 Duncan Williams Asset Management LLC88,339$1.09M0.4%+27.7%0.164%
4/15/2025SG Americas Securities LLC72,559$898K0.0%+92.9%0.135%
4/10/2025Hennion & Walsh Asset Management Inc.77,637$961K0.0%+48.5%0.144%
4/8/2025Rhumbline Advisers66,079$818K0.0%-1.5%0.123%
4/7/2025 GAMMA Investing LLC6,002$74K0.0%+4,626.0%0.011%
3/24/2025Wellington Management Group LLP5,130,876$71.06M0.0%+22.8%9.532%
2/17/2025UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC381,508$5.28M0.0%-27.6%0.709%
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2/17/2025Two Sigma Investments LP38,394$532K0.0%+265.4%0.071%
2/17/2025Rafferty Asset Management LLC77,672$1.08M0.0%+24.8%0.144%
2/17/2025ProShare Advisors LLC14,524$201K0.0%+29.5%0.027%
2/17/2025Prosight Management LP418,122$5.79M1.6%-13.5%0.777%
2/17/2025Man Group plc77,430$1.07M0.0%+90.7%0.144%
2/17/2025Millennium Management LLC123,005$1.70M0.0%+9.3%0.229%
2/17/2025MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.27,269$381K0.0%+6.0%0.051%
2/17/2025Deutsche Bank AG95,970$1.33M0.0%+195.7%0.178%
2/17/2025Cresset Asset Management LLC19,434$269K0.0%-20.4%0.036%
2/17/2025Cary Street Partners Financial LLC12,500$173K0.0%N/A0.023%
2/17/2025Balyasny Asset Management L.P.38,021$527K0.0%N/A0.071%
2/17/2025Bank of America Corp DE119,007$1.65M0.0%+45.0%0.221%
2/17/2025BNP Paribas Financial Markets97,383$1.35M0.0%+74.4%0.181%
2/14/2025Boxer Capital Management LLC690,000$9.56M0.8%N/A1.282%
2/14/2025PDT Partners LLC127,203$1.76M0.2%+15.0%0.236%
2/14/2025Northern Trust Corp404,496$5.60M0.0%+8.5%0.752%
2/14/2025The Manufacturers Life Insurance Company70,184$972K0.0%-18.5%0.130%
2/14/2025Birchview Capital LP304,574$4.22M3.4%+45.3%0.566%
2/14/2025Susquehanna Fundamental Investments LLC80,677$1.12M0.0%N/A0.150%
2/14/2025Virtus ETF Advisers LLC5,148$71K0.0%+19.3%0.010%
2/14/2025Voya Investment Management LLC12,829$178K0.0%-8.1%0.024%
2/14/2025RBF Capital LLC29,200$404K0.0%-35.6%0.054%
2/14/2025Price T Rowe Associates Inc. MD3,685,708$51.05M0.0%-3.6%6.850%
2/14/2025Hsbc Holdings PLC24,179$323K0.0%+60.4%0.045%
2/14/2025Rock Springs Capital Management LP644,601$8.93M0.3%+3.1%1.198%
2/14/2025Tower Research Capital LLC TRC16,826$233K0.0%+208.3%0.031%
2/14/2025Dimensional Fund Advisors LP864,833$11.98M0.0%+1.3%1.607%
2/13/2025XTX Topco Ltd18,665$259K0.0%+19.9%0.035%
2/13/2025Mariner LLC343,917$4.76M0.0%+6.4%0.639%
2/13/2025Barclays PLC105,338$1.46M0.0%+10.6%0.196%
2/13/2025Raymond James Financial Inc.13,111$182K0.0%N/A0.024%
2/13/2025Renaissance Technologies LLC201,900$2.80M0.0%+10.4%0.375%
2/13/2025Legal & General Group Plc41,405$573K0.0%-3.7%0.077%
2/13/2025Invesco Ltd.42,846$593K0.0%+4.0%0.080%
2/13/2025FMR LLC8,071,309$111.79M0.0%+0.1%15.000%
2/13/2025Federated Hermes Inc.746,177$10.34M0.0%+84.3%1.387%
2/13/2025Finepoint Capital LP657,071$9.10M0.6%+51.6%1.221%
2/13/2025Wells Fargo & Company MN52,823$732K0.0%-20.2%0.098%
2/12/2025Massachusetts Financial Services Co. MA44,815$621K0.0%N/A0.083%
2/12/2025Headlands Technologies LLC7,330$102K0.0%+196.5%0.014%
2/12/2025Geode Capital Management LLC964,308$13.36M0.0%+0.1%1.792%
2/12/2025Franklin Resources Inc.19,687$273K0.0%N/A0.037%
2/12/2025Wellington Management Group LLP5,130,876$71.06M0.0%+22.8%9.535%
2/12/2025Norges Bank57,454$796K0.0%N/A0.107%
2/12/2025JPMorgan Chase & Co.387,350$5.37M0.0%+93.7%0.720%
2/11/2025Corebridge Financial Inc.21,140$293K0.0%-7.0%0.039%
2/11/2025Vanguard Group Inc.1,403,838$19.44M0.0%+11.5%2.609%
2/11/2025 KLP Kapitalforvaltning AS12,900$179K0.0%N/A0.024%
2/11/2025American Century Companies Inc.30,399$421K0.0%+66.1%0.056%
2/11/2025DCF Advisers LLC103,500$1.43M0.7%-3.7%0.192%
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2/11/2025Teacher Retirement System of Texas10,434$145K0.0%N/A0.019%
2/10/2025Thrivent Financial for Lutherans38,626$535K0.0%-18.7%0.072%
2/10/2025Connor Clark & Lunn Investment Management Ltd.91,840$1.27M0.0%-25.0%0.171%
2/7/2025Amundi1,954$28K0.0%-85.7%0.004%
2/7/2025 Foundation Wealth Management LLC19,471$270K0.2%N/A0.036%
2/6/2025Raymond James Financial Inc.13,111$182K0.0%N/A0.024%
2/6/2025Charles Schwab Investment Management Inc.327,151$4.53M0.0%+0.7%0.608%
2/5/2025Purkiss Capital Advisors LLC10,729$149K0.1%N/A0.020%
2/4/2025Bank of New York Mellon Corp150,238$2.08M0.0%+14.9%0.279%
2/3/2025Handelsbanken Fonder AB20,900$289K0.0%+35.7%0.039%
(Data available from 1/1/2016 forward)

PRTA Institutional Ownership - Frequently Asked Questions

Who are the largest shareholders of PRTA shares?

During the previous two years, 156 institutional investors and hedge funds held shares of Prothena. The most heavily invested institutionals were FMR LLC ($111.79M), Wellington Management Group LLP ($64.34M), Price T Rowe Associates Inc. MD ($42.77M), State Street Corp ($28.02M), Armistice Capital LLC ($27.18M), Artal Group S.A. ($24.80M), and Boxer Capital LLC ($24.17M).Learn more on Prothena's institutional investors.

What percentage of Prothena's stock is owned by institutional investors?

97.08% of Prothena's stock is owned by institutional investors. Learn more on PRTA's institutional investor holdings.

Which institutional investors have been buying Prothena's stock?

Of the 126 institutional investors that purchased Prothena's stock in the last 24 months, the following investors and hedge funds have bought the highest volume of shares: Wellington Management Group LLP ($2.96M), Armistice Capital LLC ($742K), Boxer Capital Management LLC ($690K), Artal Group S.A. ($500K), UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC ($483.67K), Price T Rowe Associates Inc. MD ($417.34K), and Bank of New York Mellon Corp ($389.17K).

How much institutional buying is happening at Prothena?

Institutional investors have bought a total of 7,338,130 shares in the last 24 months. This purchase volume represents approximately $107.58M in transactions.

Which of Prothena's major shareholders have been selling company stock?

Of the 42 institutional investors that sold Prothena's stock in the last 24 months, the following investors and hedge funds have sold the highest volume of shares: Janus Henderson Group PLC ($1.01M), Price T Rowe Associates Inc. MD ($366.58K), State Street Corp ($257.56K), Federated Hermes Inc. ($199.92K), Systematic Financial Management LP ($185.64K), UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC ($145.24K), and JPMorgan Chase & Co. ($95.98K).

How much institutional selling is happening at Prothena?

Institutional investors have sold a total of 2,935,405 shares in the last 24 months. This volume of shares sold represents approximately $45.02M in transactions.


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This page (NASDAQ:PRTA) was last updated on 8/2/2025 by MarketBeat.com Staff
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