Prothena Corporation plc (PRTA)
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This stock currently matches 5 of our scanner strategies — each hit links to the scanner.
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Trading Day
Key levels of the most recently completed trading day — not a live quote.
52-Week Range
Current price 8.10 $ — 28% of the range above the low.
Lowest and highest closing price over the last 52 weeks. The marker shows where the current price sits within that range: close to the high speaks for strength, close to the low for weakness.
Basics
Performance
Technical Indicators
Calculated from the price history · as of 08/03/2026
Valuation
Profitability
Balance Sheet & Safety
Growth
Dividend
This stock currently pays no dividend.
Quality & Screener
AI Rating
–Not yet rated — we only show a category once an SEC-backed file with at least two cited passages is available. How the Rating Is Built
Analysts & Price Target
The price target sits 164.2% above the current price.
- Consensus
- Hold
- Analyst Ratings
- 6
Combined picture of the price targets and recommendations of every analyst covering the stock. Price targets are expectations for the next 12 months, not promises — and they often follow the price rather than predict it.
Estimates by Fiscal Year
| Fiscal Year | EPS Estimate ($) | EPS Range ($) | Revenue Estimate ($M) | Expected Growth | Analysts |
|---|---|---|---|---|---|
| 12/31/2026 | 0.05 | -0.55 – 0.65 | 83 | 101.3% | 2 |
| 12/31/2027 | -1.31 | -1.31 – -1.31 | 22 | -2,720.0% | 1 |
Average of the analyst estimates for the coming fiscal years. The range shows how far the most optimistic and the most cautious estimate sit apart — the wider it is, the less certain the expectation.
Next Reporting Date
- Expected Earnings per Share
- -0.39 $
Expected date of the next quarterly or annual figures. Dates do shift occasionally — only the invitation issued by the company is binding.
Revenue & Profit
Cash Flow
Balance Sheet
Margins
Per Share
Click the chart or tab into it, then use ← and → to step through the periods.
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· Total · per year
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The figures could not be loaded right now.
Source: fundamental data
Quarterly Figures
| Quarter | EPS (Earnings Per Share) | EPS YoY (%) | Sales ($M) | Sales YoY (%) | Net Margin (%) | OCF ($M) | FCF ($M) |
|---|---|---|---|---|---|---|---|
| 2024: Q4 | -1.08 | – | 2 | 571.80 | -2,729.90 | -48 | -48 |
| 2025: Q1 | -1.12 | – | 3 | 5,556.00 | -2,128.50 | -53 | -53 |
| 2025: Q2 | -2.34 | -292.30 | 4 | -96.70 | -2,845.40 | -46 | -46 |
| 2025: Q3 | -0.68 | – | 2 | 149.00 | -1,513.10 | -41 | -41 |
| 2025: Q4 | -0.40 | – | 0 | -99.00 | -102,804.80 | -23 | -23 |
| 2026: Q1 | 0.60 | – | 51 | 1,706.40 | 64.10 | 29 | 29 |
- EPS (Earnings Per Share):
- Quarterly profit divided by the total share count — how much of the profit works out to a single share.
- YoY (Year over Year):
- Change versus the same quarter a year ago — this is how you compare without seasonal distortion (e.g. the holiday shopping season).
- Sales:
- All revenue for the quarter, before any costs are deducted — the top line of the income statement.
- Net Margin:
- What percentage of sales is left over as profit in the end. Negative means the company is posting a loss.
- OCF (Operating Cash Flow):
- The cash that actually flows into the till from the core business during the quarter — harder to dress up than book profit.
- FCF (Free Cash Flow):
- Operating cash flow minus capital expenditures — the money that's genuinely free to use, say for paying down debt, buybacks, or dividends.
Annual Figures
| Fiscal Year | Revenue ($M) | EBIT ($M) | Net Income ($M) | EPS ($) | Operating Cash Flow ($M) | Equity ($M) | Total Assets ($M) |
|---|---|---|---|---|---|---|---|
| 2016 | 1 | -160 | -160 | -4.66 | -117 | 365 | 460 |
| 2017 | 28 | -155 | -153 | -4.07 | -131 | 407 | 496 |
| 2018 | 1 | -159 | -156 | -3.93 | -28 | 323 | 499 |
| 2019 | 1 | -86 | -78 | -1.95 | -53 | 273 | 419 |
| 2020 | 1 | -113 | -111 | -2.78 | -80 | 184 | 333 |
| 2021 | 201 | 72 | 67 | 1.38 | 93 | 466 | 609 |
| 2022 | 54 | -132 | -117 | -2.47 | -109 | 622 | 758 |
| 2023 | 91 | -191 | -147 | -2.76 | -134 | 561 | 696 |
| 2024 | 135 | -155 | -122 | -2.27 | -150 | 487 | 547 |
| 2025 | 10 | -185 | -244 | -4.53 | -164 | 280 | 327 |
Fiscal years from the audited annual reports, oldest first. EBIT is the operating profit before interest and taxes; total assets are everything the company owns.
About the Company
Prothena Corporation plc, a late-stage clinical biotechnology company, focuses on discovery and development of novel therapies to treat diseases caused by protein dysregulation. Its product pipeline includes Prasinezumab, an investigational humanized monoclonal antibody which is in Phase 3 clini…
| Employees | 67 |
|---|---|
| Headquarters | Dublin, Ireland |
| Address | 77 Sir John Rogerson’s Quay, D02 VK60 Dublin, Ireland |
| Phone | 353 1 236 2500 |
| Website | prothena.com |
| IPO Date | 21. Dec 2012 |
| ISIN | USG728001086 |
Management
| Name | Title | Birth Year |
|---|---|---|
| Gene G. Kinney Ph.D. | President, CEO & Director | 1969 |
| Tran B. Nguyen M.B.A. | Chief Financial Officer | 1974 |
| Brandon S. Smith | Chief Operating Officer | 1975 |
| Wagner M. Zago Ph.D. | Chief Scientific Officer | 1973 |
| Chad H. Swanson Ph.D. | Chief Development Officer | – |
| Karin L. Walker CPA | Chief Accounting Officer & Controller | 1963 |
| Mark C. Johnson C.F.A. | Vice President of Investor Relations | – |
| Michael J. Isaacs | General Counsel & Corporate Secretary | – |
| Phillip Dolan | Sr. Director & Head of Exploratory Research | – |
| Annie Evans Kingston | Chief Strategy Officer | – |
Executives per the latest required filings; titles kept in their original language. Source: fundamental data.
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 29. Jul 2026 | Kingston Anne Evans | Chief Strategy Officer | Sell | 7,662 | 8.47 | 64,919 |
| 29. Jul 2026 | Isaacs Michael John | General Counsel & Company Sec. | Sell | 8,386 | 8.47 | 71,055 |
| 28. Jul 2026 | Zago Wagner M. | Chief Scientific Officer | Other | 51,000 | 8.56 | 436,560 |
| 28. Jul 2026 | Zago Wagner M. | Chief Scientific Officer | Other | 51,000 | – | – |
| 28. Jul 2026 | Walker Karin L | Chief Accounting Officer | Other | 15,000 | 8.56 | 128,400 |
| 28. Jul 2026 | Walker Karin L | Chief Accounting Officer | Other | 15,000 | – | – |
| 28. Jul 2026 | Swanson Chad J. | Chief Development Officer | Other | 3,467 | 8.56 | 29,678 |
| 28. Jul 2026 | Swanson Chad J. | Chief Development Officer | Other | 40,800 | 8.56 | 349,248 |
| 28. Jul 2026 | Swanson Chad J. | Chief Development Officer | Other | 51,000 | – | – |
| 28. Jul 2026 | Smith Brandon S. | Chief Operating Officer | Other | 78,000 | 8.56 | 667,680 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character.
View all insider transactions →Chart
Interactive price chart (TradingView).
Data as of: July 31, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.