Prothena Corporation plc - Ordinary Shares (PRTA)
4.5900
-0.1100 (-2.34%)
NASDAQ · Last Trade: May 30th, 11:04 PM EDT
Detailed Quote
Previous Close | 4.700 |
---|---|
Open | 4.600 |
Bid | 4.480 |
Ask | 4.840 |
Day's Range | 4.422 - 4.700 |
52 Week Range | 6.360 - 25.42 |
Volume | 1,966,074 |
Market Cap | 206.77M |
PE Ratio (TTM) | -2.004 |
EPS (TTM) | -2.3 |
Dividend & Yield | N/A (N/A) |
1 Month Average Volume | 1,787,561 |
Chart
About Prothena Corporation plc - Ordinary Shares (PRTA)
Prothena Corp is a biotechnology company focused on the discovery and development of innovative therapies to treat diseases caused by protein misfolding and aggregation. The company specializes in the research and development of monoclonal antibodies and other advanced treatments aimed at targeting neurodegenerative diseases, including Alzheimer's and Parkinson's. Through its proprietary platform, Prothena aims to address significant unmet medical needs by advancing its drug candidates through clinical trials, ultimately seeking to enhance the quality of life for patients suffering from these challenging conditions. Read More
News & Press Releases

Via Benzinga · May 28, 2025
Here are the top movers in Tuesday's session, showcasing the stocks with significant price changes.
Via Chartmill · May 27, 2025
Wondering how the US markets performed in the middle of the day on Tuesday? Discover the movers and shakers of today's session in our comprehensive analysis.
Via Chartmill · May 27, 2025
In today's session, there are notable price gaps in the US markets on Tuesday. Take a closer look at the stocks that are gap up and gap down.
Via Chartmill · May 27, 2025
Via Benzinga · May 27, 2025
Via Benzinga · May 27, 2025
Before the US market kicks off on Tuesday, let's examine the pre-market session and unveil the notable performers among the top gainers and losers.
Via Chartmill · May 27, 2025
Via Benzinga · May 27, 2025
Via Benzinga · May 27, 2025
Prothena halts birtamimab development after Phase 3 trial fails to meet endpoints in AL amyloidosis patients; cost cuts and new focus expected.
Via Benzinga · May 27, 2025
U.S. stock futures rose on Tuesday after closing lower for the week on Friday. Futures of benchmark indices were trading higher in premarket.
Via Benzinga · May 27, 2025
Via Benzinga · May 27, 2025
As the regular session of the US market on Monday comes to an end, let's delve into the after-hours session and discover the top gainers and losers shaping the post-market sentiment.
Via Chartmill · May 26, 2025
Via Benzinga · May 23, 2025
As the regular session of the US market on Friday comes to an end, let's delve into the after-hours session and discover the top gainers and losers shaping the post-market sentiment.
Via Chartmill · May 23, 2025
Prothena Corporation plc (NASDAQ:PRTA) today announced the Phase 3 AFFIRM-AL clinical trial evaluating birtamimab in patients with AL amyloidosis did not meet its primary endpoint (HR=0.915, p-value=0.7680). Based on these results, the Company will discontinue the development of birtamimab, including stopping the open label extension of the AFFIRM-AL clinical trial.
By Prothena Corporation plc · Via Business Wire · May 23, 2025
Via Benzinga · May 16, 2025
Via Benzinga · May 9, 2025
Prothena Corporation plc (NASDAQ:PRTA), a late-stage clinical biotechnology company with a robust pipeline of investigational therapeutics built on protein dysregulation expertise, today reported financial results for the first quarter of 2025 and provided business highlights.
By Prothena Corporation plc · Via Business Wire · May 8, 2025
Prothena Corporation plc (NASDAQ:PRTA), a late-stage clinical biotechnology company with a robust pipeline of investigational therapeutics built on protein dysregulation expertise, today announced that it will report its first quarter 2025 financial results on Thursday, May 8, 2025, after the close of the U.S. financial markets.
By Prothena Corporation plc · Via Business Wire · May 1, 2025

Via Benzinga · February 26, 2025