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Prothena Corporation plc (PRTA)

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Upturn Advisory Summary
02/20/2026: PRTA (1-star) is currently NOT-A-BUY. Pass it for now.
1 Year Target Price $20.5
1 Year Target Price $20.5
| 5 | Strong Buy |
| 3 | Buy |
| 2 | Hold |
| 0 | Sell |
| 0 | Strong Sell |
Key Highlights
Company Size Small-Cap Stock | Market Capitalization 485.55M USD | Price to earnings Ratio - | 1Y Target Price 20.5 |
Price to earnings Ratio - | 1Y Target Price 20.5 | ||
Volume (30-day avg) 10 | Beta -0.25 | 52 Weeks Range 4.32 - 16.16 | Updated Date 02/20/2026 |
52 Weeks Range 4.32 - 16.16 | Updated Date 02/20/2026 | ||
Dividends yield (FY) - | Basic EPS (TTM) -5.2 |
Analyzing Revenue: Products, Geography and Growth
Revenue by Products
Product revenue - Year on Year
Earnings Date
Report Date 2026-02-12 | When - | Estimate -0.5883 | Actual -0.4569 |
Profitability
Profit Margin - | Operating Margin (TTM) -1646.42% |
Management Effectiveness
Return on Assets (TTM) -29.31% | Return on Equity (TTM) -67.63% |
Valuation
Trailing PE - | Forward PE 11.07 | Enterprise Value 160555638 | Price to Sales(TTM) 41.2 |
Enterprise Value 160555638 | Price to Sales(TTM) 41.2 | ||
Enterprise Value to Revenue 13.67 | Enterprise Value to EBITDA -3.58 | Shares Outstanding 53829982 | Shares Floating 39714146 |
Shares Outstanding 53829982 | Shares Floating 39714146 | ||
Percent Insiders 19.2 | Percent Institutions 88.52 |
Upturn AI SWOT
Prothena Corporation plc

Company Overview
History and Background
Prothena Corporation plc is a biopharmaceutical company founded in 2012, spun out from Elan Corporation plc. It focuses on the discovery and development of novel therapies for rare proteopathies, a class of diseases caused by the misproduction or misbehavior of proteins. Key milestones include its IPO in 2013 and significant progress in its clinical pipeline for diseases like AL amyloidosis and Parkinson's disease.
Core Business Areas
- Neurology and Rare Diseases: Prothena's primary focus is on developing treatments for neurodegenerative and rare diseases. This includes investigational therapies targeting the underlying mechanisms of protein misfolding and aggregation. Their pipeline is designed to address unmet medical needs in conditions with limited or no effective treatment options.
Leadership and Structure
Prothena Corporation plc is led by a management team with extensive experience in the biopharmaceutical industry. The company operates with a research and development-centric organizational structure, emphasizing scientific innovation and clinical trial execution. Specific details on the leadership team are typically available on the company's investor relations website and in SEC filings.
Top Products and Market Share
Key Offerings
- Pridopidine: An investigational drug for the treatment of Huntington's disease, acting as a selective sigma-1 receptor agonist. While not yet approved, it represents a key asset in Prothena's pipeline. Competitors in the Huntington's disease space include companies developing symptomatic treatments and other disease-modifying therapies.
- Birtamimab: An investigational antibody for the treatment of AL amyloidosis, targeting amyloid deposits in the heart and other organs. It has received Breakthrough Therapy designation from the FDA. The market for AL amyloidosis treatments is growing, with competitors like Pfizer (Vyndaqel/Vyndamax) and others developing therapies.
- PRX004: An investigational antibody for the treatment of ATTR amyloidosis, targeting the transthyretin protein. This is another significant area of focus for Prothena. Key competitors in ATTR amyloidosis include Ionis Pharmaceuticals (Tegsedi) and Alnylam Pharmaceuticals (Patisiran).
Market Dynamics
Industry Overview
The biopharmaceutical industry, particularly the rare diseases and neurology segments, is characterized by high R&D costs, long development timelines, and significant regulatory hurdles. However, it also offers the potential for substantial returns due to unmet medical needs and the possibility of orphan drug exclusivity.
Positioning
Prothena is positioned as a specialized biopharmaceutical company focused on tackling difficult-to-treat rare proteopathies. Its competitive advantage lies in its deep understanding of protein misfolding diseases and its innovative antibody-based therapeutic platform.
Total Addressable Market (TAM)
The TAM for Prothena's target diseases is substantial and growing. For example, AL amyloidosis affects an estimated 3,000 to 10,000 people in the US and Europe annually. ATTR amyloidosis is also increasingly recognized, with estimates suggesting hundreds of thousands of patients worldwide. Prothena aims to capture a significant portion of these markets with its targeted therapies.
Upturn SWOT Analysis
Strengths
- Strong scientific expertise in protein misfolding diseases.
- Innovative antibody-based drug discovery platform.
- Pipeline targeting significant unmet medical needs.
- Clinical trial progress in key disease areas.
- Partnerships and collaborations with academic institutions.
Weaknesses
- Reliance on a limited number of pipeline assets.
- High R&D expenditure with no guaranteed success.
- Late-stage clinical trial risks and regulatory uncertainties.
- Limited commercial infrastructure for product launches.
Opportunities
- Expansion into new rare disease indications.
- Strategic partnerships and licensing opportunities.
- Advancements in diagnostic tools for early disease detection.
- Potential for orphan drug designations and market exclusivity.
- Growing understanding of the genetic basis of proteopathies.
Threats
- Failure of key clinical trials.
- Intensifying competition from other biotech and pharmaceutical companies.
- Stringent regulatory approval processes.
- Pricing pressures and reimbursement challenges.
- Patent expirations and generic competition for future products.
Competitors and Market Share
Key Competitors
- Pfizer Inc. (PFE)
- Ionis Pharmaceuticals, Inc. (IONS)
- Alnylam Pharmaceuticals, Inc. (ALNY)
- Roche Holding AG (RHHBY)
- Biogen Inc. (BIIB)
Competitive Landscape
Prothena faces competition from larger pharmaceutical companies with established commercial operations and significant R&D budgets, as well as other specialized biotech firms. Its advantages lie in its focused approach to specific rare proteopathies and its innovative platform. However, it is at a disadvantage in terms of scale and market reach compared to larger competitors.
Growth Trajectory and Initiatives
Historical Growth: Prothena's historical growth has been characterized by the advancement of its pipeline through various stages of clinical development and its expansion into new therapeutic areas within proteopathies.
Future Projections: Future growth projections are heavily dependent on the success of its late-stage clinical trials for key assets like birtamimab and PRX004, and potential regulatory approvals. Analyst estimates will typically focus on the potential peak sales of these drugs and the overall market opportunity.
Recent Initiatives: Recent initiatives likely include the progression of clinical trials, strategic partnerships, manufacturing scale-up for potential commercialization, and ongoing research to expand its pipeline with new targets and modalities.
Summary
Prothena Corporation plc is a promising biopharmaceutical company focused on rare protein misfolding diseases. Its strengths lie in its scientific expertise and innovative pipeline, particularly in AL and ATTR amyloidosis. However, the company faces significant risks associated with late-stage clinical trials and regulatory hurdles. Continued success hinges on successful drug development and navigating a competitive landscape.
Similar Stocks
Sources and Disclaimers
Data Sources:
- Prothena Corporation plc Investor Relations Website
- U.S. Securities and Exchange Commission (SEC) Filings (10-K, 10-Q)
- Financial News and Analysis Websites (e.g., Yahoo Finance, Bloomberg)
- Industry Research Reports
Disclaimers:
This information is for informational purposes only and does not constitute financial advice. Market share data is estimated and may not be precise. Future projections are subject to change and inherent uncertainties. Investors should conduct their own due diligence before making any investment decisions.
AI Summarization is directionally correct and might not be accurate.
Summarized information shown could be a few years old and not current.
Fundamental Rating based on AI could be based on old data.
AI-generated summaries may have inaccuracies (hallucinations). Please verify the information before taking action.
About Prothena Corporation plc
Exchange NASDAQ | Headquaters - | ||
IPO Launch date 2012-12-21 | President, CEO & Director Dr. Gene G. Kinney Ph.D. | ||
Sector Healthcare | Industry Biotechnology | Full time employees 163 | Website https://www.prothena.com |
Full time employees 163 | Website https://www.prothena.com | ||
Prothena Corporation plc, a late-stage clinical biotechnology company, focuses on discovery and development of novel therapies to treat diseases caused by protein dysregulation in the United States. Its product pipeline include Prasinezumab, an investigational humanized monoclonal antibody which is in phase 2b clinical trial, as well as phase 1 and 2 clinical trials for the treatment of parkinson's disease and other synucleinopathies. The company also develops Coramitug, an investigational antibody, which is in phase 2 clinical trial for potential treatment of transthyretin amyloidosis; BMS-986446, an investigational antibody, which is in phase 2 clinical trial to treat Alzheimer's disease; PRX012, an investigational antibody, which is in phase 1 clinical trial to treat Alzheimer's disease; PRX123, a Dual Aß-Tau Vaccine, which is in preclinical trial for treating Alzheimer's disease; and PRX019, an investigational antibody, which is in phase 1 clinical trial for the potential treatment of neurodegenerative diseases. It has a license, development, and commercialization agreement with F. Hoffmann-La Roche Ltd. and Hoffmann-La Roche Inc. to develop and commercialize antibodies that target a-synuclein, including prasinezumab; and master collaboration agreement with Bristol Myers Squibb to develop and commercialize antibodies targeting tau, TDP-43. Prothena Corporation plc was incorporated in 2012 and is based in Dublin, Ireland.

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