Prothena Stock Performance
as on October 31, 2026 at 2:16 pm IST
Day's Low
Day's High
$8.36$8.90
1.30%
Downside
5.08%
Upside

52 Week's Low
52 Week's High
$7.73$11.80
8.74%
Downside
39.32%
Upside

Prothena share price movements today
- Previous Close
- $8.88
- Open
- $8.90
- Volume
- 411.3K
- Market Cap
- $467.2M
- Day's Low - High
- $8.36 - $8.90
- 52 Week Low - High
- $7.73 - $11.80
Prothena Historical Returns
- 1 Month Return
- + 5.97 %
- 3 Month Return
- + 5.59 %
- 1 Year Return
- -15.27 %
- 3 Year Return
- -74.96 %
- 5 Year Return
- -83.96 %
Prothena Stock Fundamentals & Key Indicators
Check Prothena market cap, PE, PB, PEG ratios, dividend yield, and other key fundamental indicators.
Market Cap
$467.2M
EPS (TTM)
-0.83
Dividend Yield
0.00%
Quarterly Earnings Growth YOY
0.00%
PE Ratio (TTM)
-10.96
Industry PE ratio
-7.60
PEG Ratio
-0.06
EBITDA
-42.8M
Revenue (TTM)
54.5M
Profit Margin
43.52%
Return On Equity TTM
-14.98%
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 % |
|---|---|---|---|---|---|---|
| Buy | $467.2M | -83.96% | -10.96 | 43.52% | 0.00% | |
| Neutral | $85.5B | -35.47% | -26.84 | -12.57% | 0.00% | |
| StrongBuy | $134.2B | 192.00% | 30.58 | 86.04% | 0.00% | |
| Buy | $83.7B | 27.94% | 19.42 | 84.86% | 0.45% |
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
₹86,492
Returns
Returns from Prothena Stock
Dollar Impact
₹5,672 (+5.67%)
Analyst Recommendation on Prothena Stock
Based on 3 analysts
66.67%
Buy
33.33%
Hold
0.00%
Sell
Based on 3 analysts, 66.66666666666666% of analysts recommend a 'BUY' 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
60.42%UPSIDE
Target Price
$21.4
Current Price
$8.47
Analyzed by
3 Analysts
High
$36
Target
$21.40
Low
$13
Prothena target price $21.4, a slight upside of 60.42% compared to current price of $8.47. According to 3 analysts rating.
Indian Investors' Interest in Prothena Stock
Search interest for Prothena Stock has decreased by -26% in the last 30 days, reflecting a downward trend in search activity.
Time period: to
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.
POSITIVE IMPACTPrice Rise

In the last 7 days, PRTA stock has moved up by 8.3%
NO EFFECTAgainst Peers

In the last 3 years, Moderna, Inc. Common Stock has given 192.3% return, outperforming this stock by 268.1%
NO EFFECTAgainst Peers

In the last 1 year, Moderna, Inc. Common Stock has given 720.2% return, outperforming this stock by 737.6%
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 IMPACTRevenue Fall

Revenue is down for the last 2 quarters, 51.08M → 1.01M (in $), with an average decrease of 98.0% per quarter
About Prothena
| Organisation | Prothena |
| Headquarters | 77 Sir John Rogerson’s Quay, Dublin, DU, D02 VK60, IE |
| Industry | Biotechnology |
| CEO | Gene G. Kinney |
Key Management of Prothena
Name | Title |
|---|---|
Ms. Karin L. Walker CPA | Chief Accounting Officer & Controller |
Mr. Michael J. Isaacs | General Counsel & Corporate Secretary |
Phillip Dolan | Sr. Director & Head of Exploratory Research |
Mr. Brandon S. Smith | Chief Operating Officer |
Dr. Wagner M. Zago Ph.D. | Chief Scientific Officer |
Mr. Mark C. Johnson C.F.A. | Vice President of Investor Relations |
Ms. Annie Evans Kingston | Chief Strategy Officer |
Dr. Gene G. Kinney Ph.D. | President, CEO & Director |
Mr. Tran B. Nguyen M.B.A. | Chief Financial Officer |
FAQs
What is Prothena share price today?
Prothena share price today is $8.47 as on at the close of the market. Prothena share today touched a day high of $8.90 and a low of $8.36.
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 $8.47,which is 28.22% down from its 52 week high and 9.57% 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.
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 ₹94.94999694824219 or $1 (as of ) using the INDmoney app.
For example: If you want to invest $10 or ₹949.50 in Prothena stock (as per the Rupee-Dollar exchange rate as on ).
Based on Prothena share’s latest price of $8.47 as on October 31, 2026 at 8:46 am IST, you will get 1.1806 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 -83.96% share price returns and 27.22% 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?