Prothena Corp Public (PRTA) Return on Equity [ROE] (2013 - 2026)
Prothena Corp Public's Return on Equity [ROE] was -14.65% in Q2 2026, up 64.86 percentage points from -79.51% a year earlier and up 36.30 percentage points from the prior quarter.
Powered by 
Analysis
Prothena Corp Public (PRTA) Return on Equity [ROE] (2013 - 2026) Analysis & Trends
For FY2025, Return on Equity [ROE] at Prothena Corp Public came in at -63.62%, down 40.28 percentage points from FY2024.
- Return on Equity [ROE] shows a five-year change of -14.97 percentage points (FY2020 to FY2025).
- In earlier years, Return on Equity [ROE] was -23.34% in FY2024 (+1.51 pp), -24.85% in FY2023 (-3.35 pp), -21.50% in FY2022 (-42.10 pp) and 20.61% in FY2021 (+69.25 pp).
- The Q2 2026 figure marks the highest quarterly Return on Equity [ROE] since Q2 2024.
- Compared with a year earlier, Return on Equity [ROE] was higher in three of the last eight quarters, with an average year-over-year change of -20.25 percentage points.
- The best year-over-year quarter for Return on Equity [ROE] over five years was Q1 2022 (a gain of 74.32 percentage points); the worst was Q2 2025 (a drop of 70.11 percentage points).
- Per Business Quant data, PRTA's Return on Equity [ROE] in the three quarters before Q2 2026 was -50.95% (Q1 2026), -84.80% (Q4 2025) and -90.56% (Q3 2025).
Peer Set
Peer Comparison
| # | Company | Market Cap | Enterprise Value | Gross Profit (Qtr) | ROE (Qtr) |
|---|---|---|---|---|---|
| 1 | Eli Lilly | 1,076.25 Bn | 1,044.84 Bn | 19.71 Bn | 82.09% |
| 2 | Johnson & Johnson | 617.18 Bn | 535.70 Bn | 17.26 Bn | 25.32% |
| 3 | AbbVie | 464.58 Bn | 437.73 Bn | 12.70 Bn | - |
| 4 | Merck | 356.04 Bn | 310.47 Bn | 12.21 Bn | 7.21% |
| 5 | Novartis Ag | 269.07 Bn | 224.94 Bn | 11.24 Bn | 84.40% |
| 6 | Astrazeneca | 243.21 Bn | 216.77 Bn | 12.86 Bn | 21.39% |
| 7 | Amgen | 217.88 Bn | 173.28 Bn | 7.24 Bn | 83.75% |
| 8 | Gilead Sciences | 179.62 Bn | 153.74 Bn | 6.22 Bn | -18.38% |
| 9 | Pfizer | 158.45 Bn | 105.40 Bn | 10.94 Bn | 4.97% |
| 10 | Prothena Corp Public | 432.58 Mn | -823.49 Mn | - | -14.65% |
Historic Data
Download Data
Historic Data
| Date | Value |
|---|---|
| Jun 30, 2026 | -14.65% |
| Mar 31, 2026 | -50.95% |
| Dec 31, 2025 | -84.80% |
| Sep 30, 2025 | -90.56% |
| Jun 30, 2025 | -79.51% |
| Mar 31, 2025 | -23.85% |
| Dec 31, 2024 | -23.96% |
| Sep 30, 2024 | -23.62% |
| Jun 30, 2024 | -9.39% |
| Mar 31, 2024 | -32.41% |
| Dec 31, 2023 | -24.95% |
| Sep 30, 2023 | -12.22% |
| Jun 30, 2023 | -23.69% |
| Mar 31, 2023 | -20.74% |
| Dec 31, 2022 | -22.78% |
| Sep 30, 2022 | -38.52% |
| Jun 30, 2022 | -0.33% |
| Mar 31, 2022 | 14.91% |
| Dec 31, 2021 | 13.99% |
| Sep 30, 2021 | 17.81% |
API Access
Prothena Corp Public Return on Equity [ROE] API
Pull this series into your own models, spreadsheets and apps with the Business Quant
Historical Metrics API. The request below matches the chart above — change the
frequency, period or values and it follows. Swap YOUR_API_KEY for your own key.
https://data.businessquant.com/historic?slug=return-on-equity-%5Broe%5D&ticker=PRTA&period=max&api_key=YOUR_API_KEYimport requests
url = "https://data.businessquant.com/historic"
params = {"slug": "return-on-equity-[roe]", "ticker": "PRTA", "period": "max", "api_key": "YOUR_API_KEY"}
data = requests.get(url, params=params).json()const res = await fetch("https://data.businessquant.com/historic?slug=return-on-equity-%5Broe%5D&ticker=PRTA&period=max&api_key=YOUR_API_KEY");
const data = await res.json();