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Prothena Corp PLC

8.93

-0.0900-1.00%

Post-market: 8.930.00000.00%16:15 EDT

Volume:376.27K

Turnover:3.36M

Market Cap:458.44M

PE:-10.71

High:9.14

Open:9.06

Low:8.77

Close:9.02

52wk High:11.80

52wk Low:7.73

Shares:51.34M

Float Shares:39.86M

Volume Ratio:1.20

T/O Rate:0.94%

Dividend:- -

Dividend Rate:- -

EPS(TTM):-0.8337

EPS(LYR):-4.5346

ROE:-14.39%

ROA:-10.67%

PB:1.60

PE(LYR):-1.97

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Overview Company News Filings

Prothena Management to Join H.C. Wainwright Global Investment Conference Fireside Chat

Prothena 10% Owner William P. Scully Buys 27,000 Shares for $255,739

3 Growth Stocks With High Insider Ownership You Need To Watch

Simply Wall St.

Prothena 10% Owner William P. Scully Buys $439,430 of Common Shares

Prothena Files Initial Beneficial Ownership Statement for Todd W. Fennell

Analysts Offer Insights on Healthcare Companies: Gain Therapeutics (GANX) and Prothena (PRTA)

Prothena Files Initial Beneficial Ownership Statement for Todd W. Fennell

Prothena 10% Owner William P. Scully Buys $293,052 of Common Shares

Prothena Corporation PLC Reports Results for the Quarter Ended June 30 - Earnings Summary

Prothena Publishes Corporate Overview Presentation on Protein-Dysregulation Drug Pipeline

Prothena Q2 FY26 Net Loss Narrows to $18.6 Million; Revenue Drops to $1 Million

Prothena Corp Q2 EPS $0.36 Beats $(0.09) Estimate, Sales $1.010M Miss $28.295M Estimate

Benzinga Earnings

Prothena Q2 Net Income USD -18.583 Million

Prothena: May Earn $55 Mln Clinical Milestone Payment if Bristol Myers Squibb Decides to Advance Prx019 ; Bms Decision Expected Year End 2026

THOMSON REUTERS

Prothena Corporation PLC Expected to Post a Loss of 39 Cents a Share - Earnings Preview

Prothena General Counsel Michael J. Isaacs Disposes of Common Shares Worth $111,080.17

Press Release: Prothena to Report Second Quarter 2026 Financial Results on August 6

Prothena to Report Second-quarter Financial Results After Market Close

Top Growth Companies With Insider Ownership For July 2026

Simply Wall St.

Prothena 10% owner William P. Scully buys 20,000 shares worth $157,990

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Scully bought 50,000 ordinary shares at a weighted average price of $8.79.His directly held stake rose ","market":"fut","thumbnail":null,"type":0,"news_type":0,"thumbnails":[],"rights":null,"property":[],"language":"en","translate_title":"","themeId":null,"theme_name":"","theme_type":"","isJumpTheme":false,"source_url":"https://api.refinitiv.com/data/news/v1/stories/urn:newsml:reuters.com:20260821:nNDL5wqPfp:1","is_publish_highlight":false,"source_rank":0,"column":"","sentiment":"1","news_top_title":"Prothena 10% Owner William P. Scully Buys $439,430 of Common Shares","news_tag":"shareholding,insiderTrades","news_rank":0,"length":0,"strategy_id":0,"source":null,"symbols":["BK4139","PRTA"],"isVideo":false,"video":null,"gpt_icon":0},{"id":"2660494061","title":"Prothena Files Initial Beneficial Ownership Statement for Todd W. 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Fennell.Fennell was reported as ","market":"us","thumbnail":null,"type":0,"news_type":0,"thumbnails":[],"rights":null,"property":[],"language":"en","translate_title":"","themeId":null,"theme_name":"","theme_type":"","isJumpTheme":false,"source_url":"https://api.refinitiv.com/data/news/v1/stories/urn:newsml:reuters.com:20260818:nNDL69Gk7s:1","is_publish_highlight":false,"source_rank":0,"column":"","sentiment":"0","news_top_title":null,"news_tag":"","news_rank":0,"length":0,"strategy_id":0,"source":null,"symbols":["BK4139","PRTA"],"isVideo":false,"video":null,"gpt_icon":0},{"id":"2659123357","title":"Analysts Offer Insights on Healthcare Companies: Gain Therapeutics (GANX) and Prothena (PRTA)","url":"https://stock-news.laohu8.com/highlight/detail?id=2659123357","media":"TIPRANKS","labels":[],"top":-1,"itemType":null,"share":"https://ttm.financial/m/news/2659123357?lang=en_us&edition=fundamental","pubTime":"2026-08-15 00:10","pubTimestamp":1786723806,"startTime":"0","endTime":"0","summary":"Companies in the Healthcare sector have received a lot of coverage today as analysts weigh in on Gain Therapeutics (GANX) and Prothena (PRTA). 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Fennell, listed as a 10% owner, with a reportable event dated Aug. 6, 2026.Filing states no s","market":"us","thumbnail":null,"type":0,"news_type":0,"thumbnails":[],"rights":null,"property":[],"language":"en","translate_title":"","themeId":null,"theme_name":"","theme_type":"","isJumpTheme":false,"source_url":"https://api.refinitiv.com/data/news/v1/stories/urn:newsml:reuters.com:20260811:nNDL5NHZMp:1","is_publish_highlight":false,"source_rank":0,"column":"","sentiment":"0","news_top_title":null,"news_tag":"","news_rank":0,"length":0,"strategy_id":0,"source":null,"symbols":["BK4139","PRTA"],"isVideo":false,"video":null,"gpt_icon":0},{"id":"2658955042","title":"Prothena 10% Owner William P. 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Isaacs disposes of common shares worth $111,080.17Prothena General Counsel and Company Secretary Michael John Isaacs cut his stake through two ordinary share dispos","market":"fut","thumbnail":null,"type":0,"news_type":0,"thumbnails":[],"rights":null,"property":[],"language":"en","translate_title":"","themeId":null,"theme_name":"","theme_type":"","isJumpTheme":false,"source_url":"https://api.refinitiv.com/data/news/v1/stories/urn:newsml:reuters.com:20260731:nNDL4yvbW0:1","is_publish_highlight":false,"source_rank":0,"column":"","sentiment":"-1","news_top_title":"Prothena General Counsel Michael J. 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In such an environment, companies that not only demonstrate growth potential but also have high insider ownership can be appealing as they often align management's interests with those of shareholders.","market":"hk","thumbnail":"https://images.simplywall.st/asset/industry/6111000-choice1-main-header/1585186710114","type":0,"news_type":0,"thumbnails":["https://images.simplywall.st/asset/industry/6111000-choice1-main-header/1585186710114"],"rights":{"source":"simplywall_highlight","url":"https://simplywall.st/stocks/us/pharmaceuticals-biotech/nasdaq-prta/prothena/news/top-growth-companies-with-insider-ownership-for-july-2026","rn_cache_url":null,"directOrigin":true},"property":[],"language":"en","translate_title":"","themeId":null,"theme_name":"","theme_type":"","isJumpTheme":false,"source_url":"https://simplywall.st/stocks/us/pharmaceuticals-biotech/nasdaq-prta/prothena/news/top-growth-companies-with-insider-ownership-for-july-2026","is_publish_highlight":false,"source_rank":0,"column":"","sentiment":"0","news_top_title":null,"news_tag":"","news_rank":0,"length":0,"strategy_id":0,"source":"simplywall_highlight","symbols":["MNRS","BK4516","EQBK","BK4166","SMCY","WGMI","BK4539","LU0053671581.USD","LU1861220033.SGD","CORT","IREX","BK4543","LU2063271972.USD","STCE","BK4563","CBRS","FBT","BK4505","BK4532","APPX","IBLC","BK4613","LU0154236417.USD","LU2087625088.SGD","CLOD","IREG","IREZ","IE00B894F039.SGD","LU1559883803.SGD","BK4585","PRTA","PSCH","LU2360106780.USD","BK4600","APP","BK4107","BK4588","SMCX","BKCH","IE00BZ9MQY76.HKD","DAPP","XDAT","LU0353189763.USD","KRMN","BK4214","LU0353189680.USD","BK4023","SMCC","KINS","SMCL","IRE","SMCI","LU2778985437.USD","BK4182","IE00B19Z9Z06.USD","LU1852331112.SGD","BK4007","UXIN","LU2250418816.HKD","02525","BK4141","LU0097036916.USD","HSAI","BK4561","LU2290526834.HKD","BK4211","BK4187","IE00B19Z9P08.USD","BK4122","LU2476274308.USD","UPSX","LU2476274720.SGD","LU1861215975.USD","FDIG","BITQ","SMYY","SMCZ","LU2360107168.USD","UPST","BK4124","BK4608","LU0056508442.USD","LU0566484027.USD","BK4595","BK4139","EROC","IREN","BK4170"],"isVideo":false,"video":null,"gpt_icon":0},{"id":"2644087811","title":"Prothena 10% owner William P. Scully buys 20,000 shares worth $157,990","url":"https://stock-news.laohu8.com/highlight/detail?id=2644087811","media":"Reuters","labels":["shareholding","insiderTrades"],"top":-1,"itemType":null,"share":"https://ttm.financial/m/news/2644087811?lang=en_us&edition=fundamental","pubTime":"2026-06-18 23:39","pubTimestamp":1781797154,"startTime":"0","endTime":"0","summary":"Prothena 10% owner William P. Scully bought 20,000 ordinary shares at USD 7.9 each.His directly held stake rose to 756,000 ordinary shares.The filing also shows 80,000 ordinary shares held indirectly via Manatee Equity Fund LLC.It also reports 52,000 ordinary shares held indirectly by his spouse.Disclaimer: This news brief was created by Public Technologies  using generative artificial intelligence. While PUBT strives to provide accurate and timely information, this AI-generated content is for informational purposes only and should not be interpreted as financial, investment, or legal advice. Prothena Corporation plc published the original content used to generate this news brief via EDGAR, the Electronic Data Gathering, Analysis, and Retrieval system operated by the U.S. Securities and Exchange Commission , on June 18, 2026, and is solely responsible for the information contained therein.","market":"fut","thumbnail":null,"type":0,"news_type":0,"thumbnails":[],"rights":null,"property":[],"language":"en","translate_title":"","themeId":null,"theme_name":"","theme_type":"","isJumpTheme":false,"source_url":"https://api.refinitiv.com/data/news/v1/stories/urn:newsml:reuters.com:20260618:nNDL4FPTJL:1","is_publish_highlight":false,"source_rank":0,"column":"","sentiment":"1","news_top_title":"Prothena 10% owner William P. 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