9.83
price up icon4.46%   0.42
pre-market  Pre-market:  9.80   -0.03   -0.31%
loading
Prothena Corp Plc stock is traded at $9.83, with a volume of 510.85K. It is up +4.46% in the last 24 hours and down -8.30% over the past month. 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.
See More
Previous Close:
$9.41
Open:
$9.36
24h Volume:
510.85K
Relative Volume:
0.99
Market Cap:
$514.63M
Revenue:
$9.68M
Net Income/Loss:
$-244.09M
P/E Ratio:
-2.1678
EPS:
-4.5346
Net Cash Flow:
$-168.85M
1W Performance:
+0.72%
1M Performance:
-8.30%
6M Performance:
-6.20%
1Y Performance:
+50.08%
1-Day Range:
Value
$9.36
$10.00
1-Week Range:
Value
$9.02
$10.09
52-Week Range:
Value
$4.32
$11.80

Prothena Corp Plc Stock (PRTA) Company Profile

Name
Name
Prothena Corp Plc
Name
Phone
011-353-1-236-2500
Name
Address
77 SIR JOHN ROGERSON'S QUAY, BLOCK C, DUBLIN 2
Name
Employee
67
Name
Twitter
@ProthenaCorp
Name
Next Earnings Date
2026-05-07
Name
Latest SEC Filings
Name
PRTA's Discussions on Twitter

Compare PRTA vs VRTX, REGN, ARGX, ALNY, RVMD

Stocks Price Market Cap Revenue Net Income Cash Flow EPS
PRTA icon
PRTA
Prothena Corp Plc
9.83 492.64M 9.68M -244.09M -168.85M -4.5346
VRTX icon
VRTX
Vertex Pharmaceuticals Inc
434.52 110.03B 12.34B 4.34B 3.71B 16.87
REGN icon
REGN
Regeneron Pharmaceuticals Inc
638.88 67.37B 14.92B 4.42B 3.79B 41.04
ARGX icon
ARGX
Argen X Se Adr
806.46 50.76B 4.16B 1.29B 734.26M 19.58
ALNY icon
ALNY
Alnylam Pharmaceuticals Inc
297.45 40.12B 4.29B 577.22M 641.34M 4.2086
RVMD icon
RVMD
Revolution Medicines Inc
151.56 32.68B 742.00K -1.37B -1.07B -7.0731

Prothena Corp Plc Stock (PRTA) Upgrades & Downgrades

Date Action Analyst Rating Change
May-28-25 Downgrade BofA Securities Neutral → Underperform
May-27-25 Downgrade Cantor Fitzgerald Overweight → Neutral
May-27-25 Downgrade Jefferies Buy → Hold
May-27-25 Downgrade Oppenheimer Outperform → Perform
Dec-20-24 Initiated Chardan Capital Markets Buy
Jan-30-24 Downgrade BofA Securities Buy → Neutral
Dec-12-23 Initiated Deutsche Bank Buy
Apr-24-23 Initiated SVB Securities Outperform
Jan-27-23 Initiated Piper Sandler Overweight
Nov-04-22 Downgrade RBC Capital Mkts Outperform → Sector Perform
Sep-28-22 Upgrade BofA Securities Neutral → Buy
Nov-19-21 Initiated JMP Securities Mkt Outperform
Jun-18-21 Upgrade BofA Securities Underperform → Neutral
Jun-08-21 Reiterated Oppenheimer Outperform
May-26-21 Initiated Citigroup Buy
Feb-26-21 Upgrade RBC Capital Mkts Sector Perform → Outperform
Feb-12-21 Upgrade Jefferies Hold → Buy
Feb-02-21 Upgrade BTIG Research Neutral → Buy
Dec-07-20 Initiated H.C. Wainwright Buy
Jul-09-20 Upgrade Oppenheimer Perform → Outperform
Nov-19-19 Upgrade Evercore ISI In-line → Outperform
May-21-18 Downgrade Barclays Equal Weight → Underweight
Apr-23-18 Downgrade Jefferies Buy → Hold
Apr-05-18 Reiterated Barclays Overweight
Nov-20-17 Downgrade Wedbush Outperform → Neutral
Sep-29-17 Reiterated BTIG Research Buy
Sep-15-17 Initiated RBC Capital Mkts Outperform
Aug-17-17 Initiated Evercore ISI Outperform
Jul-11-17 Initiated Jefferies Buy
Apr-12-17 Initiated Cantor Fitzgerald Overweight
Apr-12-17 Initiated Piper Jaffray Overweight
Mar-02-17 Initiated Instinet Buy
Dec-21-16 Initiated SunTrust Buy
Nov-03-16 Initiated Deutsche Bank Buy
Aug-04-16 Reiterated Barclays Overweight
May-13-16 Initiated Barclays Overweight
Feb-19-16 Reiterated Wedbush Outperform
Jan-21-16 Initiated Credit Suisse Outperform
View All

Prothena Corp Plc Stock (PRTA) Latest News

pulisher
May 15, 2026

Prothena (NASDAQ: PRTA) investors approve board, KPMG and executive pay - Stock Titan

May 15, 2026
pulisher
May 15, 2026

Rubric Capital and David Rosen disclose 9.29% stake in Prothena (PRTA) - Stock Titan

May 15, 2026
pulisher
May 14, 2026

Prothena Corp plc stock (IE00B91XRN20): Biotech investor focus amid pipeline updates - AD HOC NEWS

May 14, 2026
pulisher
May 14, 2026

Number of shareholders of Prothena Corp. Plc – DUS:0PT - TradingView

May 14, 2026
pulisher
May 12, 2026

PRTA Stock Price, Quote & Chart | PROTHENA CORP PLC (NASDAQ:PRTA) - ChartMill

May 12, 2026
pulisher
May 11, 2026

William Scully reports 10.27% stake in PROTHENA (NASDAQ: PRTA) - Stock Titan

May 11, 2026
pulisher
May 11, 2026

Prothena Corp. Down Over 9%, on Pace for Largest Percent Decrease Since May 2025 -- Data Talk - Moomoo

May 11, 2026
pulisher
May 11, 2026

Earnings Beat: Prothena Corporation plc Just Beat Analyst Forecasts, And Analysts Have Been Updating Their Models - Yahoo Finance

May 11, 2026
pulisher
May 09, 2026

Prothena (PRTA) Heavy US$244 Million Annual Loss Tests Bullish Profitability Narratives - Sahm

May 09, 2026
pulisher
May 08, 2026

Prothena Posts Q1 Earnings as Revenues Surge on Milestone Payment - Yahoo Finance

May 08, 2026
pulisher
May 08, 2026

Prothena (PRTA) Highlights Progress in Parkinson's Research and Collaborations - GuruFocus

May 08, 2026
pulisher
May 08, 2026

Citizens raises Prothena stock price target on milestone payment By Investing.com - Investing.com UK

May 08, 2026
pulisher
May 08, 2026

Prothena (PRTA) Revises 2026 Cash Outlook and Operating Expenses - GuruFocus

May 08, 2026
pulisher
May 07, 2026

Prothena (NASDAQ:PRTA) Smashes Q1 Estimates on $50 Million Milestone Payment, Shares Steady - ChartMill

May 07, 2026
pulisher
May 07, 2026

Prothena: Q1 Earnings Snapshot - marketscreener.com

May 07, 2026
pulisher
May 07, 2026

Milestone revenue lifts Prothena (NASDAQ: PRTA) cash and pipeline - Stock Titan

May 07, 2026
pulisher
May 07, 2026

Prothena (NASDAQ: PRTA) posts $32.7M Q1 profit and lifts 2026 cash outlook - Stock Titan

May 07, 2026
pulisher
May 07, 2026

A $50M Novo milestone reshaped Prothena’s 2026 cash outlook - Stock Titan

May 07, 2026
pulisher
Apr 30, 2026

Prothena to Report First Quarter 2026 Financial Results on May 7 - ChartMill

Apr 30, 2026
pulisher
Apr 29, 2026

3 Growth Companies Insiders Are Eager To Hold - Sahm

Apr 29, 2026
pulisher
Apr 28, 2026

Prothena (NASDAQ:PRTA) Shares Up 5.9%Time to Buy? - MarketBeat

Apr 28, 2026
pulisher
Apr 27, 2026

FDA Fast Track granted to Phase 3 drug for ATTR-CM - Stock Titan

Apr 27, 2026
pulisher
Apr 27, 2026

Prothena Announces Novo Nordisk Obtains Fast Track Designation from the U.S. FDA for Coramitug (PRX004) in ATTR Amyloidosis with Cardiomyopathy - The Joplin Globe

Apr 27, 2026
pulisher
Apr 26, 2026

Prothena authorizes up to $100 million share repurchase plan - MSN

Apr 26, 2026
pulisher
Apr 23, 2026

PRTA SEC FilingsProthena 10-K, 10-Q, 8-K Forms - Stock Titan

Apr 23, 2026
pulisher
Apr 23, 2026

Price vs Value Analysis | Prothena Corporation posts 29.8% EPS beat with narrower loss - Cổng thông tin điện tử tỉnh Lào Cai

Apr 23, 2026
pulisher
Apr 23, 2026

PRTA (Prothena Corporation plc Ordinary Shares) rises 3.61 percent after Q4 2025 EPS outpaces analyst consensus estimates.AI Powered Stock Picks - Xã Châu Thành

Apr 23, 2026
pulisher
Apr 22, 2026

Liquidity Mapping Around (PRTA) Price Events - Stock Traders Daily

Apr 22, 2026
pulisher
Apr 21, 2026

Prothena Corporation plc (NASDAQ:PRTA) Given Consensus Rating of "Hold" by Analysts - MarketBeat

Apr 21, 2026
pulisher
Apr 18, 2026

Prothena (NASDAQ:PRTA) Share Price Passes Above 200-Day Moving AverageTime to Sell? - MarketBeat

Apr 18, 2026
pulisher
Apr 15, 2026

Prothena Corp plc stock (IE00B91XRN20): Why does its biotech pipeline matter more now for investors? - AD HOC NEWS

Apr 15, 2026
pulisher
Apr 14, 2026

Prothena FY25 Earnings Review: Partnered Programs Advance Toward Milestones as Wholly-Owned Assets Pivot - AlphaStreet

Apr 14, 2026
pulisher
Apr 13, 2026

Prothena Announces Leadership Team Updates - National Today

Apr 13, 2026
pulisher
Apr 12, 2026

Chardan Lowers Prothena (PRTA) Price Target Following AFFIRM-AL Trial Failure - MSN

Apr 12, 2026
pulisher
Apr 11, 2026

Why (PRTA) Price Action Is Critical for Tactical Trading - Stock Traders Daily

Apr 11, 2026
pulisher
Apr 11, 2026

Prothena Corp PLC (PRTA) Stock Earnings Transcripts - GuruFocus

Apr 11, 2026
pulisher
Apr 10, 2026

Prothena (NASDAQ: PRTA) awards 100,000 stock options to Chief Strategy Officer - Stock Titan

Apr 10, 2026
pulisher
Apr 10, 2026

Prothena (PRTA) Chief Strategy Officer reports 66,942 shares and option grants - Stock Titan

Apr 10, 2026
pulisher
Apr 10, 2026

Prothena (PRTA) Strengthens Leadership Team with Key Promotions - GuruFocus

Apr 10, 2026
pulisher
Apr 10, 2026

Prothena promotes Kingston, Isaacs to leadership roles - Investing.com

Apr 10, 2026
pulisher
Apr 10, 2026

Prothena Corporation Announces Leadership Team Updates to Support Pipeline Development - geneonline.com

Apr 10, 2026
pulisher
Apr 10, 2026

Prothena promotes Kingston, Isaacs to leadership roles By Investing.com - Investing.com India

Apr 10, 2026
pulisher
Apr 09, 2026

Insider Sell: Will Prothena Corporation plc outperform tech stocksQuarterly Investment Review & Verified Swing Trading Watchlist - baoquankhu1.vn

Apr 09, 2026
pulisher
Apr 08, 2026

PRTA Financials: Revenue Breakdown, Margins & Competitor Comparison - Intellectia AI

Apr 08, 2026
pulisher
Apr 06, 2026

Published on: 2026-04-07 04:52:36 - baoquankhu1.vn

Apr 06, 2026
pulisher
Apr 06, 2026

Is Prothena (PRTA) Stock Trending Down | Price at $10.05, Up 1.93%Real-time Trade Ideas - newser.com

Apr 06, 2026
pulisher
Apr 05, 2026

Analyst Calls: How do insiders feel about Prothena Corporation plc2026 Chart Watch & Daily Entry Point Alerts - baoquankhu1.vn

Apr 05, 2026
pulisher
Apr 02, 2026

Gap Down: Can Prothena Corporation plc be recession proofWeekly Trend Report & AI Driven Price Predictions - baoquankhu1.vn

Apr 02, 2026
pulisher
Apr 01, 2026

Prothena Corp plc Stock: Clinical Milestones and Strategic Focus in Biotechnology Drive Investor Int - AD HOC NEWS

Apr 01, 2026
pulisher
Apr 01, 2026

PRTA Earning Date, Earning Analysis and Earning Prediction - Intellectia AI

Apr 01, 2026
pulisher
Apr 01, 2026

PRTA Technical Analysis & Stock Price Forecast - Intellectia AI

Apr 01, 2026

Prothena Corp Plc Stock (PRTA) Financials Data

Revenue

loading

Net Income

loading

Cash Flow

loading

EPS

loading
$29.96
price down icon 2.98%
$106.24
price down icon 3.00%
$92.14
price up icon 1.33%
$54.50
price up icon 1.77%
ONC ONC
$310.25
price up icon 0.20%
$151.56
price down icon 1.41%
Cap:     |  Volume (24h):