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PRTA

NASD Prothena Corp. Plc
Oct 31, 2026 · 10:28 AM ET EOD Market Closed

$8.47 ↑ +0.00 (+0.00%) Trading Up from the previous close of $8.47, $0.43 below the day’s high of $8.90

YTD change
-11.31%
vs 20-day SMA
+0.09%
vs 200-day SMA
-8.34%

Price ranges

Previous day
$8.35 $8.90
open $8.79 close $8.47
-$0.32 (-3.64%)
Today
$8.35 $8.90
$8.47
Past week
$7.93 $9.26
from $8.25 now $8.47
+$0.22 (+2.67%)
Past month
$7.80 $9.31
from $8.54 now $8.47
-$0.07 (-0.82%)
This year
$7.73 $11.80
from $9.55 now $8.47
-$1.08 (-11.31%)

Price & Performance

-2.17 (-20.39%) / 6M

$7.65$8.92$10.18$11.45May 1Aug 3Oct 30

Signals & Sentiment

Momentum, market sentiment, and recent alerts

Not So Good
  • The stock is 89.4% away from all-time highs of $79.75
  • PRTA is down 11% since the beginning of the year
  • PRTA is down 19% over the past 12 months
  • PRTA is down 1% over the past 1 month
  • 18% of all PRTA investors are betting against PRTA

PRTA reads not so good: price sits above one of the two key moving averages, the 12-month move is -21.2%.

Financial Strength

Earnings, valuation, and balance sheet

Earnings

Profitable No
EPS $-0.36
Earnings momentum -58.5% Quarterly EPS growth
Quarterly change -58.5%

Valuation

P/E ratio N/A
Enterprise value $181.8M
Beta 0.89

Balance sheet & scale

IncomeN/A
Revenue$54.1M
Cash$288.2M
Debt$7.0K
Income / Debt N/A

Company & Peers

Company profile and competitor comparison

Company profile

ExchangeNASD
Sector Professional, Scientific, and Technical Services
Industry Group Scientific Research and Development Services
Market cap $434.8M

Prothena Corp. Plc is a clinical-stage neuroscience company, which engages in the discovery and development of novel therapies to change the course of devastating diseases. The firm’s clinical pipeline includes both wholly owned and partnered programs being developed for the potential treatment of diseases including AL amyloidosis, ATTR amyloidosis, Alzheimer’s disease, Parkinson’s disease and other neurodegenerative diseases. The company was founded in December 1969 and is headquartered in Dublin, Ireland.

Competitor comparison

TickerCompany PriceChange
AMGN Amgen Inc. $466.01 +1.15%
MRNA Moderna, Inc. $221.72 -0.47%
RVMD Revolution Medicines, Inc. $191.31 +0.55%
ROIV Roivant Sciences Ltd. $36.91 -1.63%
BNTX BioNTech SE Sponsored ADR $88.17 -1.08%

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Prices and alerts are delayed by at least 20 minutes. Chart history reflects daily closing prices. Information is provided for research purposes only and is not investment advice.