Prothena Corporation plc (PRTA)

Prothena is a clinical-stage biotechnology company focused on diseases driven by protein misfolding and dysregulation. It develops antibody and other protein-targeting therapies for neurodegenerative conditions and rare peripheral amyloid diseases. Its pipeline draws on decades of expertise in pathogenic proteins such as those implicated in Alzheimer’s, Parkinson’s and related disorders.

Market
Nasdaq
Sector
Healthcare
Trend
Uptrend
Last close
9.82 (+2.29% on the day)
MA50
9.07
MA200
9.49
52-week range
7.91–11.51
Market cap
480M USD
Dividend yield
0%
Data as of
2026-09-04
Quarterly revenue and earnings, millions
QuarterRevenueYoY %EarningsYoY %
Q2 20254.4-125.8
Q3 20252.4-36.5
Q4 20250-21.6
Q1 202651.132.7
Q2 20261-77.2%-18.6

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