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How to buy Prothena Corporation stock (PRTA)

Buy Prothena Corporation stock in 5 easy steps, view past price performance and learn what’s ahead for the company.

Prothena Corporation is a biotechnology business based in the US. Prothena Corporation shares (PRTA) are listed on the NASDAQ and all prices are listed in US Dollars. Its last market close was $8.50 – a decrease of 11.92% over the previous week. Prothena Corporation employs 163 staff and has a trailing 12-month revenue of around $135.2 million.

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  4. Search for the stock name – PRTA. Search for the stock by name or ticker symbol.
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Prothena Corporation stock price (NASDAQ: PRTA)

Use our graph to track the performance of PRTA stocks over time.

Prothena Corporation shares at a glance

Information last updated 2025-04-27.
Latest market close$8.50
52-week range$9.00 - $25.42
50-day moving average $12.69
200-day moving average $16.48
Wall St. target price$51.75
PE ratio N/A
Dividend yield N/A
Earnings per share (TTM) $-2.27

Is it a good time to buy Prothena Corporation stock?

The technical analysis gauge below displays real-time ratings for the timeframes you select. This is not a recommendation, however. It represents a technical analysis based on the most popular technical indicators: Moving Averages, Oscillators and Pivots. Finder might not concur and takes no responsibility.

This chart is not advice or a guarantee of success. Rather, it gauges the real-time recommendations of three popular technical indicators: moving averages, oscillators and pivots. Finder is not responsible for how your stock performs.

Prothena Corporation price performance over time

Historical closes compared with the close of $8.5 from 2025-05-02

1 week (2025-04-25) -12.37%
1 month (2025-04-04) -21.73%
3 months (2025-02-05) -42.49%
6 months (2024-11-05) -49.64%
1 year (2024-05-03) -62.93%
2 years (2023-05-04) -87.88%
3 years (2022-05-04) 31.26
5 years (2020-05-04) 12.08

Is Prothena Corporation stock undervalued or overvalued?

Valuing Prothena Corporation stock is incredibly difficult, and any metric has to be viewed as part of a bigger picture of Prothena Corporation's overall performance. However, analysts commonly use some key metrics to help gauge the value of a stock.

Prothena Corporation's PEG ratio

Prothena Corporation's "price/earnings-to-growth ratio" can be calculated by dividing its P/E ratio by its growth – to give 0.8. A low ratio can be interpreted as meaning the shares offer better value, while a higher ratio can be interpreted as meaning the shares offer worse value.

The PEG ratio provides a broader view than just the P/E ratio, as it gives more insight into Prothena Corporation's future profitability. By accounting for growth, it could also help you if you're comparing the share prices of multiple high-growth companies.

Prothena Corporation financials

Revenue TTM $135.2 million
Gross profit TTM $-87,362,000
Return on assets TTM -15.54%
Return on equity TTM -23.34%
Profit margin -90.5%
Book value $9.05
Market Capitalization $522.1 million

TTM: trailing 12 months

Prothena Corporation share dividends

We're not expecting Prothena Corporation to pay a dividend over the next 12 months.

Prothena Corporation share price volatility

Over the last 12 months, Prothena Corporation's shares have ranged in value from as little as $9 up to $25.42. A popular way to gauge a stock's volatility is its "beta".

Beta is a measure of a share's volatility in relation to the market. The market (NASDAQ average) beta is 1, while Prothena Corporation's is 0.072. This would suggest that Prothena Corporation's shares are less volatile than average (for this exchange).

Prothena Corporation overview

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 includes birtamimab, an investigational humanized antibody, which in phase 3 clinical trial to treat patients with AL amyloidosis; and 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.

Frequently asked questions

What percentage of Prothena Corporation is owned by insiders or institutions?
Currently 19.022% of Prothena Corporation shares are held by insiders and 102.733% by institutions.
How many people work for Prothena Corporation?
Latest data suggests 163 work at Prothena Corporation.
When does the fiscal year end for Prothena Corporation?
Prothena Corporation's fiscal year ends in December.
Where is Prothena Corporation based?
Prothena Corporation's address is: 77 Sir John Rogerson?s Quay, Dublin, Ireland, D02 VK60
What is Prothena Corporation's ISIN number?
Prothena Corporation's international securities identification number is: USG728001086
What is Prothena Corporation's CUSIP number?
Prothena Corporation's Committee on Uniform Securities Identification Procedures number is: G72800108

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