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Prothena Corp PLC

8.48

+0.46005.74%

Post-market: 8.520.0439+0.52%16:39 EDT

Volume:690.41K

Turnover:5.80M

Market Cap:435.34M

PE:-10.17

High:8.63

Open:7.93

Low:7.88

Close:8.02

52wk High:11.80

52wk Low:7.73

Shares:51.34M

Float Shares:39.86M

Volume Ratio:1.15

T/O Rate:1.73%

Dividend:- -

Dividend Rate:- -

EPS(TTM):-0.8337

EPS(LYR):-4.5346

ROE:-14.39%

ROA:-10.67%

PB:1.52

PE(LYR):-1.87

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Overview Company News Filings

Prothena 10% Owner William P. Scully Reports Purchase of 100,000 Shares Worth $857,240

Prothena Chief Development Officer Chad Swanson Resigns Effective Oct. 9

Prothena 10% Owner William P. Scully Buys USD 890,874 of Common Shares

Prothena 10% Owner William P. Scully Buys USD 843,460 of Common Shares

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

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Scully, a 10% owner of Prothena, bought 100,000 ordinary shares at a weighted average $8.43.Direct stake rose to 927,00","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:20260921:nNDL6KzzBF:1","is_publish_highlight":false,"source_rank":0,"column":"","sentiment":"1","news_top_title":"Prothena 10% Owner William P. Scully Buys USD 843,460 of Common Shares","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":"2666453725","title":"Prothena Management to Join H.C. 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Wainwright 28th Annual Global Investment Conference on Sept","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:20260909:nNDL4jqcGs:1","is_publish_highlight":false,"source_rank":0,"column":"","sentiment":"0","news_top_title":null,"news_tag":"conferences","news_rank":0,"length":0,"strategy_id":0,"source":null,"symbols":["PRTA","BK4139"],"isVideo":false,"video":null,"gpt_icon":0},{"id":"2664802552","title":"Prothena 10% Owner William P. 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Scully bought 27,000 ordinary shares at a weighted-average price of $9.47.Direct holdings rose to 827,","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:20260903:nNDLbJl4zn:1","is_publish_highlight":false,"source_rank":0,"column":"","sentiment":"1","news_top_title":"Prothena 10% Owner William P. 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In such a fluctuating environment, growth stocks with high insider ownership can be appealing as they often indicate strong confidence from those closest to the company in its long-term potential.","market":"us","thumbnail":"https://images.simplywall.st/asset/industry/7021000-choice1-main-header/1585186662944","type":0,"news_type":0,"thumbnails":["https://images.simplywall.st/asset/industry/7021000-choice1-main-header/1585186662944"],"rights":{"source":"simplywall_highlight","url":"https://simplywall.st/stocks/us/diversified-financials/nyse-foa/finance-of-america-companies/news/3-growth-stocks-with-high-insider-ownership-you-need-to-watc","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/diversified-financials/nyse-foa/finance-of-america-companies/news/3-growth-stocks-with-high-insider-ownership-you-need-to-watc","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":["BK4139","PRTA","BK4195","BK4006","BK4229","METC","FOA"],"isVideo":false,"video":null,"gpt_icon":0},{"id":"2661592292","title":"Prothena 10% Owner William P. 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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":["PRTA","BK4139"],"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":["PRTA","BK4139"],"isVideo":false,"video":null,"gpt_icon":0},{"id":"2658955042","title":"Prothena 10% Owner William P. 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