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Prothena (PRTA) Institutional Ownership

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$8.77 +0.21 (+2.45%)
Closing price 08/22/2025 04:00 PM Eastern
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$8.76 -0.01 (-0.17%)
As of 08/22/2025 07:44 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.

Institutional Ownership Changes (13F Filings) for Prothena (NASDAQ:PRTA)

Current
Institutional Ownership
Percentage
97.08%
Number of
Institutional Buyers
(last 12 months)
91
Total
Institutional Inflows
(last 12 months)
$125.16M
Number of
Institutional Sellers
(last 12 months)
42
Total
Institutional Outflows
(last 12 months)
$46.93M
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PRTA Institutional Buying and Selling by Quarter

Prothena Major Shareholders & Ownership History

Reporting DateMajor Shareholder NameShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails
8/15/2025 Tower Research Capital LLC TRC 12,709$77K0.0%+571.0%0.024%
8/15/2025 Monimus Capital Management LP206,475$1.25M0.9%N/A0.384%
8/15/2025 Voleon Capital Management LP18,536$113K0.0%N/A0.034%
8/15/2025 Rangeley Capital LLC715,367$4.34M5.4%N/A1.329%
8/15/2025 Man Group plc42,752$260K0.0%+151.5%0.079%
8/15/2025 Engineers Gate Manager LP40,967$249K0.0%N/A0.076%
8/15/2025 BNP Paribas Financial Markets46,844$284K0.0%+389.1%0.087%
8/15/2025 Birchview Capital LP451,019$2.74M2.7%+35.5%0.838%
8/15/2025 Balyasny Asset Management L.P.575,792$3.50M0.0%N/A1.070%
8/15/2025 Bank of America Corp DE210,945$1.28M0.0%+59.8%0.392%
8/15/2025 Ameriprise Financial Inc.151,543$920K0.0%N/A0.282%
8/14/2025 PDT Partners LLC41,281$251K0.0%-72.5%0.077%
8/14/2025 Quantinno Capital Management LP59,618$362K0.0%N/A0.111%
8/14/2025 MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.21,218$129K0.0%-22.4%0.039%
8/14/2025 Armistice Capital LLC2,236,000$13.57M0.2%+1.8%4.154%
8/14/2025 The Manufacturers Life Insurance Company 15,140$92K0.0%-76.8%0.028%
8/14/2025 Squarepoint Ops LLC209,249$1.27M0.0%N/A0.389%
8/14/2025 Nebula Research & Development LLC22,857$139K0.0%N/A0.042%
8/14/2025 Qube Research & Technologies Ltd414,828$2.52M0.0%N/A0.771%
8/14/2025 Federated Hermes Inc.1,181,087$7.17M0.0%+116.2%2.194%
8/13/2025 Cresset Asset Management LLC10,314$63K0.0%-21.4%0.019%
8/13/2025 New York State Common Retirement Fund8,979$55K0.0%-37.1%0.017%
8/13/2025 Virtus Investment Advisers LLC18,547$113K0.0%+56.0%0.034%
8/13/2025 Norges Bank57,454$349K0.0%N/A0.107%
8/13/2025 Quadrature Capital Ltd23,752$144K0.0%N/A0.044%
8/13/2025 Hsbc Holdings PLC46,047$282K0.0%+251.8%0.086%
8/13/2025 Russell Investments Group Ltd.96,196$584K0.0%+7,956.6%0.179%
8/12/2025 DCF Advisers LLC156,500$950K0.4%-19.7%0.291%
8/12/2025 American Century Companies Inc.59,965$364K0.0%+72.1%0.111%
8/12/2025 Rhumbline Advisers63,005$382K0.0%-4.7%0.117%
8/12/2025 Franklin Resources Inc.56,078$340K0.0%+184.0%0.104%
8/12/2025 Legal & General Group Plc9,323$57K0.0%-77.5%0.017%
8/12/2025 JPMorgan Chase & Co.126,951$771K0.0%-65.9%0.236%
8/12/2025 Swiss National Bank56,500$343K0.0%-17.8%0.105%
8/8/2025 Intech Investment Management LLC18,374$112K0.0%-44.9%0.034%
8/8/2025 Creative Planning50,569$307K0.0%+373.0%0.094%
8/8/2025 SG Americas Securities LLC51,941$315K0.0%-28.4%0.096%
8/8/2025 Geode Capital Management LLC933,446$5.67M0.0%-8.0%1.734%
8/8/2025 PNC Financial Services Group Inc.18,028$109K0.0%+3,594.3%0.033%
8/8/2025 Quinn Opportunity Partners LLC50,000$304K0.0%N/A0.093%
The Coin That Could Define Trump’s Crypto Presidency (Ad)

When Trump returned to office, one of his first moves was to tap PayPal’s former COO, David Sacks, as a top advisor on crypto and AI. That alone signaled a shift. But insiders close to D.C. aren’t just talking crypto policy—they’re quietly buying something most retail investors have missed. While the crowd chases Bitcoin to $150,000, Weiss Ratings expert Juan Villaverde believes a different coin—already backed by giants like Google, Visa, and PayPal—could soon become crypto’s “Third Giant.”tc pixel

Discover the coin that could define Trump’s crypto presidency.
8/7/2025 Monaco Asset Management SAM70,000$425K0.1%N/A0.130%
8/7/2025 Acadian Asset Management LLC1,018,177$6.18M0.0%N/A1.891%
8/7/2025 Connor Clark & Lunn Investment Management Ltd.18,896$115K0.0%-79.3%0.035%
8/7/2025 Los Angeles Capital Management LLC16,702$101K0.0%N/A0.031%
8/6/2025 Prospera Financial Services Inc10,000$61K0.0%N/A0.019%
8/5/2025 Corton Capital Inc.13,964$85K0.1%N/A0.026%
8/1/2025 Purkiss 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%
6/27/2025 Goldman Sachs Group Inc.510,462$6.32M0.0%-8.3%0.948%
5/23/2025 Siren L.L.C.1,283,555$15.88M0.9%+16.7%2.385%
5/16/2025 Goldman Sachs Group Inc.510,462$6.32M0.0%-8.3%0.948%
5/16/2025 Jacobs Levy Equity Management Inc.18,553$230K0.0%N/A0.034%
5/15/2025 Birchview Capital LP332,974$4.12M3.5%+9.3%0.619%
5/15/2025 Palo Alto Investors LP1,659,734$20.54M3.9%-4.5%3.083%
5/15/2025 PDT Partners LLC150,316$1.86M0.1%+18.2%0.279%
5/15/2025 Armistice Capital LLC2,196,000$27.18M0.4%-1.8%4.080%
5/15/2025 Siren L.L.C.1,283,555$15.88M0.9%+16.7%2.385%
5/14/2025 Rafferty Asset Management LLC43,978$544K0.0%-43.4%0.082%
5/14/2025 Price T Rowe Associates Inc. MD3,455,856$42.77M0.0%-6.2%6.420%
5/14/2025 Hsbc Holdings PLC13,088$160K0.0%-45.9%0.024%
5/14/2025 Wellington Management Group LLP5,199,528$64.34M0.0%+1.3%9.660%
5/13/2025 Cresset Asset Management LLC13,125$162K0.0%-32.5%0.024%
5/13/2025 American Century Companies Inc.34,836$431K0.0%+14.6%0.065%
5/12/2025 Nuveen LLC149,961$1.86M0.0%N/A0.279%
5/12/2025 Invesco Ltd.37,638$466K0.0%-12.2%0.070%
5/9/2025 Chicago Partners Investment Group LLC14,512$180K0.0%+29.6%0.027%
5/9/2025 Charles Schwab Investment Management Inc.319,607$3.96M0.0%-2.3%0.594%
5/9/2025 DCF Advisers LLC195,000$2.41M1.2%+88.4%0.362%
5/8/2025 Federated Hermes Inc.546,255$6.76M0.0%-26.8%1.015%
5/7/2025 Purkiss Capital Advisors LLC21,629$268K0.2%+101.6%0.040%
5/7/2025 TD Asset Management Inc62,694$776K0.0%-3.1%0.116%
5/6/2025 Pinnacle Associates Ltd.100,259$1.24M0.0%-2.7%0.186%
5/6/2025 KLP Kapitalforvaltning AS6,700$83K0.0%-48.1%0.012%
4/30/2025 Alps Advisors Inc.37,956$470K0.0%-12.8%0.071%
4/29/2025 Bank 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%
4/15/2025 SG Americas Securities LLC72,559$898K0.0%+92.9%0.135%
4/10/2025 Hennion & Walsh Asset Management Inc.77,637$961K0.0%+48.5%0.144%
4/8/2025 Rhumbline Advisers66,079$818K0.0%-1.5%0.123%
4/7/2025 GAMMA Investing LLC6,002$74K0.0%+4,626.0%0.011%
3/24/2025 Wellington Management Group LLP5,130,876$71.06M0.0%+22.8%9.532%
2/17/2025 UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC381,508$5.28M0.0%-27.6%0.709%
2/17/2025 Two Sigma Investments LP38,394$532K0.0%+265.4%0.071%
2/17/2025 Rafferty Asset Management LLC77,672$1.08M0.0%+24.8%0.144%
2/17/2025 ProShare Advisors LLC14,524$201K0.0%+29.5%0.027%
2/17/2025 Prosight Management LP418,122$5.79M1.6%-13.5%0.777%
The Coin That Could Define Trump’s Crypto Presidency (Ad)

When Trump returned to office, one of his first moves was to tap PayPal’s former COO, David Sacks, as a top advisor on crypto and AI. That alone signaled a shift. But insiders close to D.C. aren’t just talking crypto policy—they’re quietly buying something most retail investors have missed. While the crowd chases Bitcoin to $150,000, Weiss Ratings expert Juan Villaverde believes a different coin—already backed by giants like Google, Visa, and PayPal—could soon become crypto’s “Third Giant.”tc pixel

Discover the coin that could define Trump’s crypto presidency.
2/17/2025 Man Group plc77,430$1.07M0.0%+90.7%0.144%
2/17/2025 Millennium Management LLC123,005$1.70M0.0%+9.3%0.229%
2/17/2025 MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.27,269$381K0.0%+6.0%0.051%
2/17/2025 Deutsche Bank AG95,970$1.33M0.0%+195.7%0.178%
2/17/2025 Cresset Asset Management LLC19,434$269K0.0%-20.4%0.036%
2/17/2025 Cary Street Partners Financial LLC12,500$173K0.0%N/A0.023%
2/17/2025 Balyasny Asset Management L.P.38,021$527K0.0%N/A0.071%
2/17/2025 Bank of America Corp DE119,007$1.65M0.0%+45.0%0.221%
2/17/2025 BNP Paribas Financial Markets97,383$1.35M0.0%+74.4%0.181%
2/14/2025 Boxer Capital Management LLC690,000$9.56M0.8%N/A1.282%
(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, 155 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), Artal Group S.A. ($24.80M), Boxer Capital LLC ($24.17M), and Palo Alto Investors LP ($20.54M).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 128 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), Federated Hermes Inc. ($1.02M), Acadian Asset Management LLC ($1.02M), Armistice Capital LLC ($782K), Rangeley Capital LLC ($715.37K), Boxer Capital Management LLC ($690K), and Balyasny Asset Management L.P. ($613.81K).

How much institutional buying is happening at Prothena?

Institutional investors have bought a total of 11,630,554 shares in the last 24 months. This purchase volume represents approximately $125.16M 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), JPMorgan Chase & Co. ($340.99K), State Street Corp ($257.56K), Federated Hermes Inc. ($199.92K), Systematic Financial Management LP ($185.64K), and UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC ($145.24K).

How much institutional selling is happening at Prothena?

Institutional investors have sold a total of 3,517,712 shares in the last 24 months. This volume of shares sold represents approximately $46.93M in transactions.



This page (NASDAQ:PRTA) was last updated on 8/23/2025 by MarketBeat.com Staff
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