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Why is Prothena Corporation plc (PRTA) Stock down?

We've noticed a 5.32% decline in Prothena Corporation plc (PRTA) stock during the 2024-06-11 trading session. While this could be attributed to normal volatility or various internal and external factors, please be aware that we are actively monitoring the situation, and we'll provide timely updates as soon as possible!
10 Jan, 2024:

Prothena Corporation plc (PRTA) stock dropped by 9.46% due to the company's updates on pipeline progress and cash position. Although the stock partially recovered with a 12.30% gain on January 9, the initial announcement led to a significant decline.

  • Pipeline Highlights and Positive Data: Prothena shared insights into its phase I study for PRX012, a subcutaneous antibody targeting Alzheimer's Disease (AD). Early data supports once-monthly subcutaneous treatment, with further updates expected in 2024. The company, in collaboration with Bristol Myers Squibb (BMY), is developing BMS-986446 for AD, with encouraging phase I results leading to plans for a phase II study in H1 2024.
  • Investigational Dual Aβ/Tau Vaccine Cleared: FDA clearance was granted for PRX123, a dual Aβ/tau vaccine designed for AD treatment and prevention. Updates on the phase I study are scheduled for 2024.
  • Parkinson's Disease and Amyloidosis Studies: Prothena is assessing prasinezumab for Parkinson's Disease (PD) in partnership with Roche, with top-line results expected in 2024. The company is also progressing with birtamimab for AL amyloidosis, with top-line results anticipated between Q4 2024 and Q1 2025, slightly later than previously forecasted.
  • Market Response and Investor Sentiment: The pipeline update initially led to a 9.5% stock drop, reflecting investor sentiment. While positive data and ongoing studies are promising, slight delays in certain milestones disappointed investors on January 8. The subsequent rebound on January 9 indicates some restored confidence in the company. Despite market fluctuations, Prothena's commitment to tackling neurodegenerative diseases and amyloidosis remains evident in its pipeline progress.
08 Jan, 2024:

Prothena Corporation plc (PRTA) stock dropped by 13.23% due to an update on its portfolio programs. The update covered advancements in treatments for Alzheimer's and Parkinson's diseases, as well as progress in combating amyloid diseases. Prothena also highlighted its strong financial position with approximately $621 million in cash and equivalents. The stock decline may be attributed to market reactions and investor sentiment regarding clinical trial outcomes and updates.

26 Oct, 2023:

Prothena Corporation plc (PRTA) dropped by 14.62% from $39.68 to $33.88 in the trading on Thursday October 26, 2023. The reason why PRTA stock down today is due to mixed results of its rival Biogen. Biogen make Leqembi for Alzheimer's treatment. Leqembi showed mixed results that after six months of treatment, it unexpectedly resulted in brain swelling. The news is having a greater impact on Prothena because the company has many experimental drugs, but nothing approved.

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