Prothena Corporation plc (PRTA) Earnings History
Net Loss16 years of earnings data (2010–2025) · Currently unprofitable on a TTM basis
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Prothena Corporation plc (PRTA) Earnings Overview
As of June 21, 2026, Prothena Corporation plc (PRTA) reported trailing twelve-month net income of -$151M, reflecting -99.6% year-over-year growth. The company earned $-2.79 per diluted share over the past four quarters, with a net profit margin of -2520.6%.
Looking at the long-term picture, PRTA's historical earnings data spans multiple years. The company achieved its highest annual net income of $67M in fiscal 2021.
Prothena Corporation plc is currently reporting a net loss, though operating performance should be evaluated in the context of growth investments and industry dynamics View revenue history →
Compared to peers including FOLD (-$27M net income, -4.3% margin), RARE (-$609M net income, -85.4% margin), IONS (-$327M net income, -40.4% margin), PRTA has room to improve margins relative to the peer group. Compare PRTA vs FOLD →
PRTA Earnings vs Peers
Earnings metrics vs comparable public companies
PRTA Historical Earnings Data (2010–2025)
16 years| Fiscal Year | Net Income | YoY % | Operating Income | EPS (Diluted) | Net Margin | Op. Margin |
|---|---|---|---|---|---|---|
| 2025 | -$244M | -99.6% | -$185M | $-4.53 | -2520.6% | -1905.8% |
| 2024 | -$122M | +16.8% | -$155M | $-2.27 | -90.5% | -114.4% |
| 2023 | -$147M | -25.7% | -$191M | $-2.76 | -160.9% | -209.1% |
| 2022 | -$117M | -274.6% | -$132M | $-2.47 | -217.0% | -244.1% |
| 2021 | $67M | +160.3% | $72M | $1.38 | 33.4% | 35.9% |
| 2020 | -$111M | -43.1% | -$113M | $-2.78 | -13029.8% | -13216.2% |
| 2019 | -$78M | +50.1% | -$86M | $-1.95 | -9542.6% | -10527.9% |
| 2018 | -$156M | -1.6% | -$159M | $-3.93 | -16297.9% | -16634.0% |
| 2017 | -$153M | +4.3% | -$155M | $-4.07 | -556.8% | -564.2% |
| 2016 | -$160M | -98.6% | -$160M | $-4.66 | -15176.1% | -15121.8% |
| 2015 | -$81M | -1027.4% | -$80M | $-2.66 | -5016.3% | -4974.3% |
| 2014 | -$7M | +82.6% | -$7M | $-0.29 | -14.1% | -13.1% |
| 2013 | -$41M | +1.0% | -$40M | $-2.20 | -6064.5% | -5980.3% |
| 2012 | -$41M | -39.6% | -$41M | $-2.84 | -1558.0% | -1557.9% |
| 2011 | -$30M | -137.7% | -$29M | $-1.68 | -5852.1% | -5768.0% |
| 2010 | -$12M | - | -$12M | $-0.71 | -1004.2% | -978.4% |
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Intrinsic Valuation
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PRTA — Frequently Asked Questions
Quick answers to the most common questions about buying PRTA stock.
What is PRTA earnings per share (EPS)?
PRTA trailing twelve-month (TTM) diluted EPS is $-2.79, reflecting -99.6% year-over-year growth. The 5-year EPS CAGR is N/A. Complete EPS history from 2010 to 2025 is available in the table on this page.
What is Prothena Corporation plc's net income?
Prothena Corporation plc (PRTA) trailing twelve-month net income is $-151M as of 2025. Earnings declined -99.6% year-over-year.
Is PRTA profitable?
PRTA is not currently profitable on a TTM basis, reporting a net loss of $-151M. Net margin is -2520.6%. Investors should monitor for a return to profitability.
What is PRTA's earnings growth rate?
PRTA compound annual EPS growth rates (CAGR): 1-Year: N/A, 3-Year: N/A, 5-Year: N/A, 10-Year: N/A. These figures measure the annualised rate of diluted EPS growth over each period, based on data from 2010 to 2025.
What are PRTA's profit margins?
Prothena Corporation plc net profit margin is -2520.6%, operating margin is -1905.8%, and gross margin is +61.8%. Below-average margins reflect competitive or cost pressures. Return on Equity is -63.6%.
Is PRTA growing earnings?
PRTA earnings are declining — EPS fell -99.6% year-over-year. TTM net income dropped to $-151M. This contrasts with the 5-year CAGR of N/A.
What was PRTA's best earnings year?
Prothena Corporation plc's highest annual net income on record is $67M, achieved in fiscal year 2021. Earnings history on this page spans 2010 to 2025 and includes all annual and quarterly figures.
What were PRTA's earnings last quarter?
PRTA's most recent reported quarter was Q1 2026. Net income was $33M with diluted EPS of $0.60. For a full breakdown of all quarters, see the quarterly earnings table on this page.