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Prothena Corp PLC

9.45

+0.42004.65%

Post-market: 9.450.00000.00%19:30 EDT

Volume:376.04K

Turnover:3.52M

Market Cap:485.13M

PE:-11.34

High:9.52

Open:9.11

Low:9.09

Close:9.03

52wk High:11.80

52wk Low:7.73

Shares:51.34M

Float Shares:39.88M

Volume Ratio:1.13

T/O Rate:0.94%

Dividend:- -

Dividend Rate:- -

EPS(TTM):-0.8337

EPS(LYR):-4.5346

ROE:-14.39%

ROA:-10.67%

PB:1.69

PE(LYR):-2.08

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Overview Company News Filings

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

Prothena 10% owner William P. Scully acquires $1.02 million in common shares

Prothena files Form 3 for General Counsel, Company Secretary Michael J. Isaacs

Prothena 10% owner William P. Scully buys 50,000 shares worth $465,295

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Fennell, listed as a 10% owner, with a reportable event dated Aug. 6, 2026.Filing states no s","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: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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This is a 120.81 percent increase over losses of $(1.73) per share from the","market":"hk","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://www.benzinga.com/news/earnings/26/08/61020055/prothena-corp-q2-eps-0-36-beats-0-09-estimate-sales-1-010m-miss-28-295m-estimate","is_publish_highlight":false,"source_rank":0,"column":"","sentiment":"-1","news_top_title":"Prothena Corp Q2 EPS $0.36 Beats $(0.09) Estimate, Sales $1.010M Miss $28.295M Estimate","news_tag":"express","news_rank":0,"length":0,"strategy_id":0,"source":null,"symbols":["BK4139","PRTA"],"isVideo":false,"video":null,"gpt_icon":0},{"id":"2657657610","title":"Prothena Q2 Net Income USD -18.583 Million","url":"https://stock-news.laohu8.com/highlight/detail?id=2657657610","media":"Reuters","labels":["express"],"top":-1,"itemType":null,"share":"https://ttm.financial/m/news/2657657610?lang=en_us&edition=fundamental","pubTime":"2026-08-07 04:06","pubTimestamp":1786046760,"startTime":"0","endTime":"0","summary":"BRIEF-Prothena Q2 Net Income USD -18.583 MillionAug 06 (Reuters) - Prothena Q2 collaboration revenue USD 1.01 million.Q2 pretax profit USD -18.581 millionQ2 operating expenses USD 22.111 million","market":"nz","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:20260806:nPLXFVR9G5:1","is_publish_highlight":false,"source_rank":0,"column":"","sentiment":"-1","news_top_title":null,"news_tag":"express","news_rank":0,"length":0,"strategy_id":0,"source":null,"symbols":["PRTA","BK4139"],"isVideo":false,"video":null,"gpt_icon":0},{"id":"2657665655","title":"Prothena: May Earn $55 Mln Clinical Milestone Payment if Bristol Myers Squibb Decides to Advance Prx019 ; Bms Decision Expected Year End 2026","url":"https://stock-news.laohu8.com/highlight/detail?id=2657665655","media":"THOMSON REUTERS","labels":[],"top":-1,"itemType":null,"share":"https://ttm.financial/m/news/2657665655?lang=en_us&edition=fundamental","pubTime":"2026-08-07 04:05","pubTimestamp":1786046701,"startTime":"0","endTime":"0","summary":null,"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:20260806:nPLXFVR9G5:5","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":"reuters_en_live","symbols":["LU0985481810.HKD","LU2596442595.SGD","BK4559","LU1670710588.SGD","LU1868836757.USD","PRTA","LU0456855351.SGD","LU0237698245.USD","LU1323610961.USD","BMY","IE0002141913.USD","LU0096364046.USD","LU2360032135.SGD","LU1074936037.SGD","LU1291159041.SGD","LU0306806265.USD","LU2125154778.USD","IE00BSNM7G36.USD","LU1430594728.SGD","BK4585","LU1868836591.USD","LU0061475181.USD","BK4588","IE0009355771.USD","LU1670711040.USD","LU2242652126.USD","LU1670711123.USD","LU2242646821.SGD","IE00BJJMRZ35.SGD","LU0432979614.USD","LU1883839398.USD","LU0225771236.USD","BK4007","LU0267386448.USD","LU0114720955.EUR","IHE","BK4532","LU1718418525.SGD","BK4139","BK4581","IE00BJT1NW94.SGD","LU1670710661.SGD","LU1093756325.SGD","LU1989771016.USD","LU0321505868.SGD","LU2125154935.USD","LU1261432733.SGD","LU0306807586.USD","FTXH","LU1032466523.USD"],"isVideo":false,"video":null,"gpt_icon":0},{"id":"2657598516","title":"Prothena Corporation PLC Expected to Post a Loss of 39 Cents a Share - Earnings Preview","url":"https://stock-news.laohu8.com/highlight/detail?id=2657598516","media":"Reuters","labels":["preview"],"top":-1,"itemType":null,"share":"https://ttm.financial/m/news/2657598516?lang=en_us&edition=fundamental","pubTime":"2026-08-05 06:30","pubTimestamp":1785882621,"startTime":"0","endTime":"0","summary":"Prothena Corporation PLC <PRTA.OQ> expected to post a loss of39cents a share - Earnings PreviewProthena Corporation PLCPRTA.OQPRTA.Ois expected to  show a rise in quarterly revenue when it reports  re","market":"nz","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:20260804:nL8N4413GU:1","is_publish_highlight":false,"source_rank":0,"column":"","sentiment":"-1","news_top_title":null,"news_tag":"preview","news_rank":0,"length":0,"strategy_id":0,"source":null,"symbols":["PRTA","BK4139"],"isVideo":false,"video":null,"gpt_icon":0},{"id":"2655387777","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":"sg","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":["BK4608","LU2778985437.USD","BK4107","BK4516","BK4124","BK4561","LU0154236417.USD","SMCZ","IREX","HSAI","LU1559883803.SGD","APPX","BK4170","BK4595","BK4023","KINS","FBT","LU0566484027.USD","BK4182","LU1861215975.USD","UXIN","LU2476274720.SGD","SMCC","BK4588","IBLC","BK4543","LU2290526834.HKD","BK4187","UPST","BK4613","SMCL","SMCX","BK4007","EROC","BK4211","KRMN","LU1861220033.SGD","IE00B19Z9P08.USD","SMYY","IREN","BK4539","BK4532","CLOD","DAPP","PSCH","MNRS","LU2360106780.USD","SMCI","LU0053671581.USD","IRE","BK4139","LU2250418816.HKD","PRTA","LU0097036916.USD","BK4141","BK4214","EQBK","BKCH","STCE","LU0353189680.USD","IE00B19Z9Z06.USD","BK4600","IE00BZ9MQY76.HKD","IREZ","XDAT","BITQ","FDIG","SMCY","UPSX","LU2476274308.USD","LU0353189763.USD","LU2063271972.USD","CBRS","WGMI","IREG","LU2360107168.USD","LU0056508442.USD","02525","BK4122","BK4505","APP","IE00B894F039.SGD","CORT","BK4563","LU2087625088.SGD","BK4585","BK4166","LU1852331112.SGD"],"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":"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:20260618:nNDL4FPTJL:1","is_publish_highlight":false,"source_rank":0,"column":"","sentiment":"1","news_top_title":"Prothena 10% owner William P. Scully buys 20,000 shares worth $157,990","news_tag":"shareholding,insiderTrades","news_rank":0,"length":0,"strategy_id":0,"source":null,"symbols":["PRTA","BK4139"],"isVideo":false,"video":null,"gpt_icon":0},{"id":"2643158082","title":"Prothena 10% owner William P. Scully acquires $1.02 million in common shares","url":"https://stock-news.laohu8.com/highlight/detail?id=2643158082","media":"Reuters","labels":["shareholding","insiderTrades","merge"],"top":-1,"itemType":null,"share":"https://ttm.financial/m/news/2643158082?lang=en_us&edition=fundamental","pubTime":"2026-06-13 06:00","pubTimestamp":1781301618,"startTime":"0","endTime":"0","summary":"Prothena 10% owner William P. Scully bought 125,000 ordinary shares at a weighted average price of $8.17.Direct holdings rose to 1.06 million ordinary shares.He also reported indirect beneficial ownership of 80,000 shares via Manatee Equity Fund LLC.Indirect holdings included 52,000 shares held 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 12, 2026, and is solely responsible for the information contained therein.","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:20260612:nNDL1QGqjx:1","is_publish_highlight":false,"source_rank":0,"column":"","sentiment":"1","news_top_title":"Prothena 10% owner William P. Scully acquires $1.02 million in common shares","news_tag":"shareholding,insiderTrades,merge","news_rank":0,"length":0,"strategy_id":0,"source":null,"symbols":["PRTA","BK4139"],"isVideo":false,"video":null,"gpt_icon":0},{"id":"2643185862","title":"Prothena files Form 3 for General Counsel, Company Secretary Michael J. Isaacs","url":"https://stock-news.laohu8.com/highlight/detail?id=2643185862","media":"Reuters","labels":[],"top":-1,"itemType":null,"share":"https://ttm.financial/m/news/2643185862?lang=en_us&edition=fundamental","pubTime":"2026-06-13 04:19","pubTimestamp":1781295583,"startTime":"0","endTime":"0","summary":"Prothena disclosed General Counsel and Company Secretary Michael John Isaacs held 48,825 ordinary shares as of June 8, 2026.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 12, 2026, and is solely responsible for the information contained therein.","market":"nz","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:20260612:nNDL90C5Yy: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":["PRTA","BK4139"],"isVideo":false,"video":null,"gpt_icon":0},{"id":"2641144159","title":"Prothena 10% owner William P. Scully buys 50,000 shares worth $465,295","url":"https://stock-news.laohu8.com/highlight/detail?id=2641144159","media":"Reuters","labels":["shareholding","insiderTrades"],"top":-1,"itemType":null,"share":"https://ttm.financial/m/news/2641144159?lang=en_us&edition=fundamental","pubTime":"2026-06-06 01:47","pubTimestamp":1780681648,"startTime":"0","endTime":"0","summary":"Prothena 10% owner William P. Scully bought 50,000 ordinary shares at a weighted average price of $9.31.His directly held stake rose to 936,000 ordinary shares.He also reported indirect holdings of 80,000 shares via Manatee Equity Fund LLC, plus 52,000 shares held 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 05, 2026, and is solely responsible for the information contained therein.","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:20260605:nNDL7KZ5Mn:1","is_publish_highlight":false,"source_rank":0,"column":"","sentiment":"1","news_top_title":"Prothena 10% owner William P. Scully buys 50,000 shares worth $465,295","news_tag":"shareholding,insiderTrades","news_rank":0,"length":0,"strategy_id":0,"source":null,"symbols":["BK4139","PRTA"],"isVideo":false,"video":null,"gpt_icon":0}],"pageSize":20,"totalPage":3,"pageCount":1,"totalSize":58,"code":"91000000","status":"200"}]}}