Prothena Corporation plc

PRTA·NasdaqGS·Healthcare
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8.39+0.18 (+2.19%)today
At close: Nov 4, 4:00 PM EST · May be delayed up to 15 min · USD

Prices may be delayed up to 15 min. Not investment advice. News volume: articles in the 4Search index each day.

Key statistics

Previous close8.21
Open8.48
Day range8.308.55
52-week range7.7311.80
Off day high−1.87%
Off 52-week high−28.90%
Volume289.19K
Avg. volume (3M)468.99K
Market cap430.72M
EPS (TTM)-0.8200
Forward P/E-6.38
P/E ratio (TTM)—
Dividend yield—
Beta (5Y)-0.21
Shares outstanding51.34M
Short interest18.63% of float
Earnings dateNov 5, 2026
Analyst target21.40
Profit margin−80.68%

Against its peers

Compare in full ›
PRTA ACIU ALEC PMN ARVN KRSA
Market cap 430.72M 227.69M 254.58M 31.57M 486.01M 1.39B
P/E (TTM) — — — — — —
Forward P/E -6.4 3.8 -3.1 -0.8 -2.3 -8.6
Price/book 1.5 4.3 -25.6 0.6 0.9 -3.9
Dividend yield — — — — — —
1-year change −20.06% −39.07% +63.35% −66.73% −25.91% +160.90%
Today +2.19% +9.57% +11.22% +3.23% +4.65% −4.38%

The closest companies by business and industry (Biotechnology). Prices may be delayed up to 15 min.

Related companies

Compare ›

The businesses closest to Prothena's by what they do, from their descriptions, with the same industry weighted in.

Company Mkt cap Price Today
AC Immune SAACIU · Biotechnology 227.69M 2.2900 +9.57%
Alector, Inc.ALEC · Biotechnology 254.58M 2.2800 +11.22%
ProMIS Neurosciences, Inc.PMN · Biotechnology 31.57M 3.5200 +3.23%
Arvinas, Inc.ARVN · Biotechnology 486.01M 7.42 +4.65%
Korsana Biosciences, Inc.KRSA · Biotechnology 1.39B 30.56 −4.38%
BioArctic AB (publ)B9A.F · Biotechnology 2.45B 27.58 −0.29%
Protara Therapeutics, Inc.TARA · Biotechnology 138.87M 2.3500 −2.49%
Voyager Therapeutics, Inc.VYGR · Biotechnology 115.23M 1.8700 +2.19%

Other companies in Biotechnology, closest in size first.

Company Mkt cap Price Today
CorMedix Inc.CRMD · Parsippany, NJ 441.16M 5.66 +1.80%
Indaptus Therapeutics, Inc.INDP · New York, NY 439.70M 3.3000 +1.85%
ProKidney Corp.PROK · Winston-Salem, NC 447.08M 1.1200 +4.67%
Cantargia AB (publ)CANTA.ST · Lund, Sweden 475.36M 1.6860 −2.09%
YD Bio LtdYDES · Taipei, Taiwan 492.28M 6.95 +7.84%
Eupraxia Pharmaceuticals Inc.EPRX · Victoria, BC 446.66M 6.76 −1.74%
Relmada Therapeutics, Inc.RLMD · Coral Gables, FL 444.81M 4.1700 −2.34%
Arvinas, Inc.ARVN · New Haven, CT 486.01M 7.42 +4.65%

Also based in Dublin, Ireland, then elsewhere in Ireland.

Company Mkt cap Price Today
Accenture plcACN · Dublin, Ireland 161.72B 264.27 +3.81%
Eaton Corporation plcETN · Dublin, Ireland 137.17B 353.08 −9.86%
PDD Holdings Inc.PDD · Dublin, Ireland 116.93B 82.15 +2.47%
Aon plcAON · Dublin, Ireland 73.12B 344.67 +4.39%
CRH plcCRH · Dublin, Ireland 65.72B 98.80 +5.63%
Experian plcJ2B.F · Dublin, Ireland 32.24B 36.80 +2.22%
AerCap Holdings N.V.AER · Dublin, Ireland 25.17B 165.72 +2.04%
AIB Group plcA5G.IR · Dublin, Ireland 24.47B 11.69 +0.65%

The stocks whose daily moves over the past year went most closely with Prothena's: the correlation of their daily returns, where 1 would be moving as one.

Company Mkt cap Price Today
Editas Medicine, Inc.EDIT · Correlation 0.46 417.74M 2.7200 +4.62%
Voyager Therapeutics, Inc.VYGR · Correlation 0.42 115.23M 1.8700 +2.19%
Arvinas, Inc.ARVN · Correlation 0.41 486.01M 7.42 +4.65%
Assembly Biosciences, Inc.ASMB · Correlation 0.40 404.57M 19.87 −0.25%
Enanta Pharmaceuticals, Inc.ENTA · Correlation 0.39 310.19M 10.65 +2.70%
Alector, Inc.ALEC · Correlation 0.38 254.58M 2.2800 +11.22%
Xencor, Inc.XNCR · Correlation 0.34 2.60B 35.03 +14.33%
Ultragenyx Pharmaceutical Inc.RARE · Correlation 0.34 1.69B 17.16 +3.19%

What visitors to Prothena's page also look at.

Company Mkt cap Price Today
PTC Therapeutics, Inc.PTCT 5.76B 68.97 +1.25%
Ultragenyx Pharmaceutical Inc.RARE 1.69B 17.16 +3.19%
Agios Pharmaceuticals, Inc.AGIO 1.87B 31.38 +0.58%
Enanta Pharmaceuticals, Inc.ENTA 310.19M 10.65 +2.70%
Xencor, Inc.XNCR 2.60B 35.03 +14.33%

From the 4SEARCH.business instruments index: what each company does (its business description), its industry, size, headquarters and the markets it serves; and from a year of daily prices, which move together. Prices may be delayed up to 20 min.

Latest news

All PRTA news ›

From the 4Search news index, newest first.

In the news

5mentions in 30 days
5with it in the headline
Negativesentiment

Mentioned with

Prothena Corporation Plc3Wall Street Zen2Weiss Ratings2Aptargroup1Astrazeneca1Barclays1Biospace1Boston University1

People in the coverage

Prothena4William Scully4Danessa Lincoln3HC Wainwright3Kim Johansen3Michael Walen3

Themes

Healthcare3Insider Trades3Form 42Industrial2Material2Pba2SEC Filings2Abbv1

Most coverage from

  1. defenseworld.net3
  2. biospace.com1
  3. stocktitan.net1

Finance and business coverage in the 4SEARCH.business news index: articles that name it in the headline, or in the text beside its ticker. Sentiment is the index's own reading of the latest 5 articles, not a forecast.

Market data is provided for information only and comes from free public sources. Prices may be delayed up to 15 minutes; data may be incomplete or inaccurate. Nothing on this page is investment advice or a recommendation to buy or sell any security. News and coverage analytics are drawn from the 4SEARCH.business index. Terms of use. How to use Finance