Prothena Corporation plc logo

Prothena Corporation plc

PRTA

NASDAQHealthcareBiotechnology

Previous close

$9.45

+$0.42 · +4.65%

Aug 21, 4:00 PM ET

PRTA company overview

Regular session · ET · Market data may be delayed.

GoAI snapshot

AI-powered factor overview

Jul 10, 2026

GoAI score

Hold

Wait — insufficient conviction to act

Valuation

47

Fair Value

Momentum

37

Weakening

Sentiment

54

Mixed

Risk resilience

53

Elevated Risk

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Company profile

Company website

Prothena Corporation plc, a late-stage clinical biotechnology company, focuses on discovery and development of novel therapies to treat diseases caused by protein dysregulation. Its product pipeline includes Prasinezumab, an investigational humanized monoclonal antibody which is in Phase 3 clinical trial for the treatment of parkinson's disease and other synucleinopathies. The company also develops Coramitug, an investigational antibody, which is in Phase 3 clinical trial for the treatment of transthyretin amyloidosis; BMS-986446, an anti-tau antibody which is in Phase 2 clinical trial to treat Alzheimer's disease; PRX019, an investigational antibody which is in Phase 1 clinical trial for the treatment of neurodegenerative diseases; and PRX123, a Dual Aß-Tau Vaccine, which is in preclinical trial for treating Alzheimer's disease. In addition, it develops discovery- and late-preclinical-stage programs include TDP-43 CYTOPE for the treatment of amyotrophic lateral sclerosis; PRX012, a next-generation anti-Aß antibody which is in phase 1 clinical trial to treat Alzheimer's disease; and PRX012-TfR, a preclinical program for the treatment of Alzheimer's disease. It has a license, development, and commercialization agreement with F. Hoffmann-La Roche Ltd. and Hoffmann-La Roche Inc. to develop and commercialize antibodies that target a-synuclein, including prasinezumab; and master collaboration agreement with Bristol Myers Squibb to develop and commercialize antibodies targeting tau, TDP-43. Prothena Corporation plc was incorporated in 2012 and is based in Dublin, Ireland.

Industry
Biotechnology
Sector
Healthcare
Headquarters
IE
CEO
Gene G. Kinney
Listed since
Dec 20, 2012
Employees
67

Market position

Day range

Current $9.45

52-week range

Current $9.45

Open
$9.09
Previous close
$9.03
Volume
376.04K
0.72× average
Average volume
525.57K
Average daily volume
Market cap
494.74M USD
Beta
-0.35
Market reference 1
50-day average
$8.9354
+5.76% above average
200-day average
$9.5344
-0.89% below average

Financials

Financial snapshot

Latest / TTM

Valuation & yield

Enterprise value
220.4M USD
P/E (TTM)
-11.39×
P/B (TTM)
1.72×
P/S (TTM)
9.07×
EV / EBITDA
-1.12×
Earnings yield
-47.48%
Free cash flow yield
-31.85%
Dividend yield
0.00%

Profitability & efficiency

Gross margin
43.52%
Operating margin
-115.09%
Net margin
-80.67%
Return on equity
-87.03%
Return on assets
-74.69%
Return on invested capital
-63.90%

Financial health

Debt / equity
0.02×
Current ratio
7.72×

Financial statements

Margin trends

Profitability as a percentage of reported revenue.

Gross marginOperating marginNet margin
Gross, operating, and net margin trends362%-686%-1734%-2783%Gross margin, FY2021: 100.00%Gross margin, FY2022: 100.00%Gross margin, FY2023: 100.00%Gross margin, FY2024: 100.00%Gross margin, FY2025: 61.77%Operating margin, FY2021: 35.88%Operating margin, FY2022: -244.05%Operating margin, FY2023: -209.08%Operating margin, FY2024: -114.36%Operating margin, FY2025: -1905.82%Net margin, FY2021: 33.39%Net margin, FY2022: -216.95%Net margin, FY2023: -160.91%Net margin, FY2024: -90.49%Net margin, FY2025: -2520.57%FY2021FY2022FY2023FY2024FY2025
Gross margin FY2021 100.00%. Gross margin FY2022 100.00%. Gross margin FY2023 100.00%. Gross margin FY2024 100.00%. Gross margin FY2025 61.77%. Operating margin FY2021 35.88%. Operating margin FY2022 -244.05%. Operating margin FY2023 -209.08%. Operating margin FY2024 -114.36%. Operating margin FY2025 -1905.82%. Net margin FY2021 33.39%. Net margin FY2022 -216.95%. Net margin FY2023 -160.91%. Net margin FY2024 -90.49%. Net margin FY2025 -2520.57%.

Income trends

Revenue

9.68M USD-92.83%

Operating income

−184.56M USD-19.41%

Net income

−244.09M USD-99.57%
Income trends across reported periods245.04M USD67.18M USD−110.69M USD−288.56M USDRevenue, FY2021: 200.58M USDRevenue, FY2022: 53.91M USDRevenue, FY2023: 91.37M USDRevenue, FY2024: 135.16M USDRevenue, FY2025: 9.68M USDOperating income, FY2021: 71.98M USDOperating income, FY2022: −131.56M USDOperating income, FY2023: −191.04M USDOperating income, FY2024: −154.56M USDOperating income, FY2025: −184.56M USDNet income, FY2021: 66.98M USDNet income, FY2022: −116.95M USDNet income, FY2023: −147.03M USDNet income, FY2024: −122.31M USDNet income, FY2025: −244.09M USDFY2021FY2022FY2023FY2024FY2025
Revenue FY2021 200.58M USD. Revenue FY2022 53.91M USD. Revenue FY2023 91.37M USD. Revenue FY2024 135.16M USD. Revenue FY2025 9.68M USD. Operating income FY2021 71.98M USD. Operating income FY2022 −131.56M USD. Operating income FY2023 −191.04M USD. Operating income FY2024 −154.56M USD. Operating income FY2025 −184.56M USD. Net income FY2021 66.98M USD. Net income FY2022 −116.95M USD. Net income FY2023 −147.03M USD. Net income FY2024 −122.31M USD. Net income FY2025 −244.09M USD.
Metric (USD)FY2025FY2024FY2023FY2022FY2021
Revenue9.68M USD135.16M USD91.37M USD53.91M USD200.58M USD
Cost of goods sold3.7M USD
Gross profit5.98M USD135.16M USD91.37M USD53.91M USD200.58M USD
Research and development134.85M USD222.52M USD220.57M USD135.56M USD82.28M USD
Selling, general, and administrative59.39M USD67.2M USD61.84M USD49.9M USD46.32M USD
Operating expenses190.54M USD289.72M USD282.41M USD185.46M USD128.6M USD
Interest income14.14M USD25.82M USD31.01M USD6.35M USD42K USD
Depreciation and amortization3.7M USD893K USD928K USD744K USD1.12M USD
Operating income−184.56M USD−154.56M USD−191.04M USD−131.56M USD71.98M USD
Net income−244.09M USD−122.31M USD−147.03M USD−116.95M USD66.98M USD

Company facts updated Aug 24, 2026.

Analyst ratings

Third-party consensus; not a GoAI recommendation.

Analyst price target

Average target

$24.50

159.26% upside
Past 12 months12-month forecastHigh $30.00Average $24.50Low $19.00

Rating distribution

28 ratings
Strong buy00%
Buy2071%
Hold621%
Sell27%
Strong sell00%

Recent analyst actions

10 institutions

PRTA news

PRTA peers

ETFs holding PRTA

Funds reporting this stock among their holdings, ordered by reported position size.

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