Prothena Stock Performance
as on September 25, 2026 at 2:15 pm IST
Day's Low
Day's High
$8.28$8.72
0.48%
Downside
4.81%
Upside

52 Week's Low
52 Week's High
$7.73$11.80
7.09%
Downside
41.83%
Upside

Prothena share price movements today
- Previous Close
- $8.68
- Open
- $8.63
- Volume
- 515.4K
- Market Cap
- $445.6M
- Day's Low - High
- $8.28 - $8.72
- 52 Week Low - High
- $7.73 - $11.80
Prothena Historical Returns
- 1 Month Return
- -11.68 %
- 3 Month Return
- -10.25 %
- 1 Year Return
- -11.11 %
- 3 Year Return
- -82.41 %
- 5 Year Return
- -88.95 %
Prothena Stock Fundamentals & Key Indicators
Check Prothena market cap, PE, PB, PEG ratios, dividend yield, and other key fundamental indicators.
Market Cap
$445.6M
EPS (TTM)
-0.83
Dividend Yield
0.00%
Quarterly Earnings Growth YOY
0.00%
PE Ratio (TTM)
-10.46
Industry PE ratio
-6.80
PEG Ratio
-0.056254794696661226
EBITDA
-41.1M
Revenue (TTM)
54.5M
Profit Margin
43.52%
Return On Equity TTM
-14.98%
Prothena Stock Valuation
Track how Prothena P/E has moved over time to understand its valuation trends.
Prothena in the last 5 years
Lowest (-24.40x)
December 31, 2022
Industry (-6.80x)
December 31, 2025
Today (-2.11x)
December 31, 2025
Highest (32.62x)
December 31, 2021
Today’s Price to Earnings Ratio: -2.11x
Prothena vs Peer Comparison
Compare market cap, revenue, PE, and other key metrics of Prothena with its industry peers.
Company | Analyst View | Market Cap | 5 Years Return % | PE Ratio | Profit Margin % | Dividend Yield % |
|---|---|---|---|---|---|---|
| Neutral | $445.6M | -88.95% | -10.46 | 43.52% | 0.00% | |
| Neutral | $72.7B | -54.71% | -22.82 | -12.57% | 0.00% | |
| StrongBuy | $130.9B | 184.51% | 29.81 | 86.04% | 0.00% | |
| Buy | $82.8B | 24.59% | 19.15 | 84.86% | 0.46% |
Stock Returns calculator for Prothena Stock including INR - Dollar returns
The Prothena stock calculator helps Indian investors calculate returns based on the historical performance of the stock. Just choose your investment amount and duration to get insights and invest more confidently. See stock returns as well as the effect of dollar appreciation over different durations.
*Dollar Impact: The bonus return you make when the US Dollar rises against the Rupee; calculated on the full amount you walk away with, not just what you invested in.
Investment Value
₹1,00,000
Prothena investment value today
Current value as on today
₹95,933
Returns
Returns from Prothena Stock
Dollar Impact
₹7,044 (+7.04%)
Analyst Recommendation on Prothena Stock
Based on 4 analysts
50.00%
Buy
25.00%
Hold
25.00%
Sell
Based on 4 analysts, 50% of analysts recommend a 'HOLD' rating for Prothena. Average target price of $21.4
Prothena Share Price Target
Get share price movements and forecasts by analysts on Prothena.
What analysts predicted
61.12%UPSIDE
Target Price
$21.4
Current Price
$8.32
Analyzed by
4 Analysts
Target
$21.40
Prothena target price $21.4, a slight upside of 61.12% compared to current price of $8.32. According to 4 analysts rating.
Indian Investors' Interest in Prothena Stock
Search interest for Prothena Stock has increased by 29% in the last 30 days, reflecting an upward trend in search activity.
Time period: to
Change:29% versus previous 30 day period
Prothena Quarterly Profit & Loss
All numbers in Millions USD
Prothena Annual Profit & Loss
All numbers in Millions USD
Prothena Quarterly Cash Flow
All numbers in Millions USD
Prothena Annual Cash Flow
All numbers in Millions USD
Insights on Prothena
Insights help you understand the recent movement of the company's critical parameters, giving you an overall view of the company.
NO EFFECTAgainst Peers

In the last 1 year, Moderna, Inc. Common Stock has given 691.6% return, outperforming this stock by 702.7%
NO EFFECTAgainst Peers

In the last 3 years, Moderna, Inc. Common Stock has given 98.5% return, outperforming this stock by 180.9%
NEGATIVE IMPACTRevenue Fall

Revenue is down for the last 2 quarters, 51.08M → 1.01M (in $), with an average decrease of 98.0% per quarter
NEGATIVE IMPACTProfit Down

Netprofit is down for the last 2 quarters, 32.72M → -18.58M (in $), with an average decrease of 156.8% per quarter
NEGATIVE IMPACTPrice Dip

In the last 3 years, PRTA stock has moved down by -82.4%
About Prothena
| Organisation | Prothena |
| Headquarters | 77 Sir John Rogerson’s Quay, Dublin, DU, D02 VK60, IE |
| Industry | Biotechnology |
| CEO | Gene G. Kinney |
| E-voting on shares | Click here to vote |
Key Management of Prothena
Name | Title |
|---|---|
Dr. Gene G. Kinney Ph.D. | President, CEO & Director |
Mr. Tran B. Nguyen M.B.A. | Chief Financial Officer |
Dr. Chad H. Swanson Ph.D. | Chief Development Officer |
Ms. Karin L. Walker CPA | Chief Accounting Officer & Controller |
Mr. Mark C. Johnson C.F.A. | Vice President of Investor Relations |
Mr. Michael J. Isaacs | General Counsel & Corporate Secretary |
Mr. Brandon S. Smith | Chief Operating Officer |
Dr. Wagner M. Zago Ph.D. | Chief Scientific Officer |
Phillip Dolan | Sr. Director & Head of Exploratory Research |
Ms. Annie Evans Kingston | Chief Strategy Officer |
FAQs
What is Prothena share price today?
Prothena share price today is $8.32 as on at the close of the market. Prothena share today touched a day high of $8.72 and a low of $8.28.
What is the 52 week high and 52 week low for Prothena share?
Prothena share touched a 52 week high of $11.80 on and a 52 week low of $7.73 on . Prothena stock price today i.e. is closed at $8.32,which is 29.49% down from its 52 week high and 7.63% up from its 52 week low.
What is Prothena's market capitalisation today?
Prothena market capitalisation is $0.00T as on .
How to invest in Prothena Stock (PRTA) from India?
- Step 1: Open a free US stocks account on INDmoney App and transfer your Rupees into Dollars to your INDmoney US stocks account. For a step by step instruction, check How to Transfer Money to Your US Stocks Account .
- Step 2: Search for Prothena on INDmoney app. Click on Buy button. You can invest as low as $1.5 in Prothena Shares that will get you 0.1803 shares as per Prothena share price of $8.32 per share as on September 25, 2026 at 8:45 am IST.
What is the minimum amount required to buy Prothena Stock (PRTA) from India?
Indian investors can start investing in Prothena (PRTA) shares with as little as ₹95.8125 or $1 (as of ) using the INDmoney app.
For example: If you want to invest $10 or ₹958.13 in Prothena stock (as per the Rupee-Dollar exchange rate as on ).
Based on Prothena share’s latest price of $8.32 as on September 25, 2026 at 8:45 am IST, you will get 1.2019 shares of Prothena. Learn more about
fractional shares .
What are the returns that Prothena has given to Indian investors in the last 5 years?
Prothena stock has given -88.95% share price returns and 29.8% dollar appreciation to an Indian investor in the last 5 years.
Read more about How do Currency Exchange Rates impact your returns on US Stock Investments?