PRTA Stock Summary and Trading Ideas (Prothena PLC - | NASDAQ:PRTA)

Prothena Corp PLC is a clinical biotechnology company that focuses on protein dysregulation and a pipeline of investigational therapeutics with the potential to change the course of devastating neurodegenerative and rare and peripheral amyloid diseases. The company's clinical pipeline of antibody-based product candidates targets a range of indications, including Amyloid Light-chain (AL) amyloidosis (NEOD001), Parkinson's disease and other related synucleinopathies (PRX002), and inflammatory diseases, including ATTR amyloidosis [Coramitug (PRX004)], Alzheimer's disease (PRX123), Neurodegeneration (PRXPRX019), and Others.

What symbol and exchange does Prothena PLC - shares trade?

Prothena PLC - trades on the NASDAQ stock market under the symbol PRTA.

What is Prothena PLC - stock price doing today?

As of January 2, 2026, PRTA stock price declined to $9.32 with 178,205 million shares trading.

What is Prothena PLC -'s Beta?

PRTA has a beta of 0.97, meaning it tends to be less sensitive to market movements. PRTA has a correlation of 0.06 to the broad based SPY ETF.

How much is Prothena PLC - worth?

PRTA has a market cap of $501.67 million. This is considered a Small Cap stock.

How much money does Prothena PLC - make?

Last quarter Prothena PLC - reported $2 million in Revenue and -$.68 earnings per share. This fell short of revenue expectation by $-11 million and missed earnings estimates by -$.12.

What is the highest and lowest price Prothena PLC - traded in the last 3 year period?

In the last 3 years, PRTA traded as high as $79.65 and as low as $4.32.

What are the top ETFs holding Prothena PLC -?

The top ETF exchange traded funds that PRTA belongs to (by Net Assets): XBI, IWM, VXF, IWN, IBB.

Is Prothena PLC - (PRTA) a good investment?

PRTA has underperformed the market in the last year with a price return of -32.7% while the SPY ETF gained +17.6%. PRTA has also underperformed the stock market ETF in the last 3 month and 2 week periods returning -4.5% and -1.2%, respectively, while the SPY returned +2.7% and +1.9%, respectively.

What are the support and resistance levels for Prothena PLC - (PRTA)?

PRTA support price is $9.22 and resistance is $9.88 (based on 1 day standard deviation move). This means that using the most recent 20 day stock volatility and applying a one standard deviation move around the stock's closing price, stastically there is a 67% probability that PRTA shares will trade within this expected range on the day.