Prothena Corporation plc (PRTA)

NASDAQ

$8.50

$+0.01

(+0.12%)

Previous Close: ⁦$8.48⁩

Market Closed

Prothena Corporation plc (PRTA) Live Price Chart

Last updated: ⁦2026-10-21 06:06:00⁩. Prices reflect the latest closing data and will resume updating on the next trading day. Stock price data is sourced from Massive.

Summary

Prothena Corporation plc (PRTA) operates in the PHARMACEUTICAL PREPARATIONS sector and is listed on NASDAQ. The stock is currently priced at $8.50, with a market capitalization of $428.66M and a P/E ratio of --. Over the past 52 weeks, its price has ranged from $7.73 to $11.80. This page covers its latest market performance, valuation, price trends and company information.

Key Market Data

Market Cap	$428.66M
Open	$8.55
Day's High	$79.75
Day's Low	$4.32
Previous Close	$8.48
Volume	443.51K
Average Volume	483.06K
P/E Ratio	--
52-Week High	$11.80
52-Week Low	$7.73
Dividend Yield	--
Earnings Date	--

Prothena Corporation plc (PRTA) Latest Closing Stock Price

Prothena Corporation plc (PRTA) last closed at $8.48 as of 2026-10-20 23:31:00, unchanged from the previous close of $8.48.

During the latest regular trading session, PRTA traded between $4.32 and $79.75, with a volume of 443.51K shares. The closing price was near the lower end and near the lower end of its 52-week range.

Prothena Corporation plc (PRTA) 7-Day Stock Price Change

Over the past seven days, Prothena Corporation plc (PRTA) moved from $8.84 to $8.50, representing a decline of 3.80% ($0.34).

The stock traded between $8.19 and $9.31 during the period. The latest price is near the lower end of the 7-day range, indicating moderate downward.

The average daily volume was 572.07 thousand shares, down versus the previous seven-day period, indicating lower trading activity.

PRTA 52-Week Price Position

Position in Range: 19.0%

52W Low$7.73

52W High$11.80

PRTA is currently trading at $8.50, placing it 19.0% of the way from its 52-week low of $7.73 to its 52-week high of $11.80. This percentage reflects the stock's relative position within its 52-week trading range, not its valuation or future performance.

What is Prothena Corporation plc (PRTA)?

Prothena Corp PLC is a late-stage 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. Prothena is developing and applying its proprietary CYTOPE technology to target a broad spectrum of intracellular disease pathways in the brain and periphery. The company's pipeline includes both wholly-owned and partnered programs like Prasinezumab, Coramitug (PRX004), BMS-986446 (PRX005), PRX019, TDP-43 CYTOPE, and PRX012-TfR, being developed for the potential treatment of Parkinson's disease, ATTR amyloidosis with cardiomyopathy, Alzheimer's disease, Amyotrophic lateral sclerosis (ALS), and other neurodegenerative diseases.

Prothena Corporation plc Information

Industry	PHARMACEUTICAL PREPARATIONS
Employees	67
Exchange	NASDAQ
Company Website	https://www.prothena.com

How to Buy Prothena Corporation plc (PRTA) Stock on MEXC

Eligible investors can buy real shares of Prothena Corporation plc (PRTA) through MEXC RealStocks. Follow these three steps to open a RealStocks account, transfer USDT, and place a US stock order.

Step 1: Open and Verify Your RealStocks Account

Log in to the MEXC App, go to Trade → RealStocks, and select Open Account. Complete the required account-opening and identity verification process with MEXC's partner licensed broker.

Step 2: Transfer USDT to Your RealStocks Account

Go to Wallets → RealStocks and transfer USDT from your Spot Account to your RealStocks Account. RealStocks are quoted in USD, while account funding can be completed using USDT.

Step 3: Search for PRTA and Place Your Order

Open the RealStocks trading page and search for PRTA. Select a market or limit order, enter the price and quantity as required, review the order details, and submit your order. Once filled, the corresponding real shares will be held in your RealStocks Account.

Frequently Asked Questions (FAQ)

1.What is Prothena Corporation plc (PRTA) stock price today?

Prothena Corporation plc (PRTA) is currently trading at $ 8.50, up 0.28% ($0.02) from the previous close of $ 8.48. Intraday prices update in real time during regular trading hours.

2.Is PRTA stock going up or down today?

As of 2026-10-20 23:31:00, PRTA is trading at $ 8.50, up 0.28% ($0.02) from its previous close of $ 8.48. The stock has traded between $ 4.32 and $ 79.75 during today’s regular session. Past price movements do not guarantee future results.

3.What is PRTA pre-market price?

As of 2026-10-20 23:31:00, PRTA is trading at $ 8.49 in pre-market trading, up 0.06% ($0.00) from the previous close of $ 8.48. Pre-market prices reflect trading activity before the regular session opens and may experience lower liquidity and higher volatility.

4.What is PRTA after-hours price?

As of 2026-10-20 23:31:00, PRTA is trading at $ 8.51 in after-hours trading, up 0.35% ($0.03) from the regular-session close of $ 8.48. After-hours prices may differ from the regular session’s opening price due to lower liquidity and wider bid-ask spreads.

5.Is PRTA stock trading now?

PRTA trades on the NASDAQ exchange during regular hours, Monday through Friday, 9:30 AM to 4:00 PM ET, excluding public holidays. Pre-market and after-hours trading are also available through select brokers outside these hours.

6.Where does PRTA sit relative to its 52-week high and low?

Over the past 52 weeks, PRTA has traded between a low of $ 7.73 and a high of $ 11.80. At $ 8.50, the stock is positioned 19.0% of the way from its 52-week low to its 52-week high, providing context for its current price within the one-year trading range.

7.What sector is Prothena Corporation plc in?

Prothena Corporation plc (PRTA) operates in the PHARMACEUTICAL PREPARATIONS sector. Sector classification helps investors compare it with companies exposed to similar market trends and competitive conditions.

8.What is Prothena Corporation plc's market capitalization and where is it listed?

Prothena Corporation plc is listed on the NASDAQ exchange with a market capitalization of $ 428.66M. Market cap reflects the total market value of all outstanding shares and is commonly used to classify stocks by size.

9.How is PRTA valued in terms of P/E ratio and EPS?

PRTA trades at a P/E ratio of --, based on trailing-twelve-month EPS of $ -0.86. P/E ratio compares the stock price to earnings per share and is a common starting point for assessing valuation relative to peers.

10.Does Prothena Corporation plc pay a dividend?

Prothena Corporation plc pays an indicated annual cash dividend of $ 0.00 per share, with a current dividend yield of 0.00% based on the latest share price. Dividend policies are subject to change at the board's discretion.