PRTA
Prothena Corporation plc
There isn't enough reported data to score PRTA yet.
PRTA Fundamentals
| Metric | Status |
|---|---|
| Healthy | |
| Under pressure | |
| Under pressure | |
| Strong |
PRTA's revenue and balance sheet are currently healthy, but its profitability and cash flow are under pressure.
PRTA PE Valuation
PRTA has no meaningful PE right now: it lost money over the past year.
PRTA Forward outlook
| Metric | Outlook |
|---|---|
| -- | |
| Losses shrinking | |
| Strong growth | |
| -- | |
| Limited | |
| Low |
Analysts expect PRTA's losses to shrink, with revenue growing. However, they disagree widely on these estimates.
PRTA Earnings Per Share
| Quarter | TTM EPS | YoY |
|---|---|---|
| Q3 2026 | -$0.47 | +$4.72 |
| Q2 2026 | -$0.83 | +$4.78 |
| Q1 2026 | -$2.81 | -$0.76 |
| Q4 2025 | -$4.53 | -$2.26 |
| Q3 2025 | -$5.19 | -$2.75 |
| Q2 2025 | -$5.61 | -$4.65 |
| Q1 2025 | -$2.05 | +$1.16 |
| Q4 2024 | -$2.27 | +$0.49 |
PRTA is still losing money, but far less than before: $0.47 per share over the past year, against $5.61 at its worst in mid-2025.
PRTA Quarterly Revenue
| Quarter | Revenue | YoY |
|---|---|---|
| Q3 2026 | $620K | -74% |
| Q2 2026 | $1M | -77% |
| Q1 2026 | $51.1M | +1706% |
| Q4 2025 | $21K | -99% |
| Q3 2025 | $2.4M | +149% |
| Q2 2025 | $4.4M | -97% |
| Q1 2025 | $2.8M | +5556% |
| Q4 2024 | $2.1M | +572% |
PRTA's revenue is growing: $620,000 last quarter, down 74% from the same quarter a year ago.
| Quarter | Margin | YoY |
|---|---|---|
| Q3 2026 | -3036% | -1369 points |
| Q2 2026 | -2089% | -175 points |
| Q1 2026 | 59% | +2378 points |
| Q4 2025 | -115252% | -112196 points |
| Q3 2025 | -1666% | +5191 points |
| Q2 2025 | -1914% | -1959 points |
| Q1 2025 | -2319% | +160737 points |
| Q4 2024 | -3057% | +21790 points |
PRTA's operating margin was −3036% last quarter, down 1369 points from the same quarter a year ago.
PRTA Free Cash Flow
| Quarter | Free cash flow | YoY |
|---|---|---|
| Q3 2026 | -$12M | +$28.6M |
| Q2 2026 | -$25M | +$21.3M |
| Q1 2026 | $28.9M | +$82.2M |
| Q4 2025 | -$23.3M | +$24.5M |
| Q3 2025 | -$40.6M | +$4.6M |
| Q2 2025 | -$46.3M | -390% |
| Q1 2025 | -$53.4M | +$19.7M |
| Q4 2024 | -$47.8M | +$3.3M |
PRTA has burned cash in most quarters: −$31M over the past year, against −$188M the year before.
PRTA Total Shares
| Period | Change % | Net change |
|---|---|---|
| Quarterly | -1.4% | -708K shares |
| 1 year | -4.4% | -2.4M shares |
| 3 years | -11% | -6.6M shares |
| 5 years | +0.5% | +232K shares |
| Available history | +29% | +11.6M shares |
PRTA has 51M diluted shares, down 4.4% from a year ago.
| Quarter | Spent |
|---|---|
| Q3 2026 | $4.3M |
| Q2 2026 | $15.6M |
| Q1 2026 | $6.9M |
PRTA Net Leverage
| Quarter | Net Leverage | Status |
|---|---|---|
| Q1 2022 | -8.1x | Net Cash |
| Q4 2021 | -7.9x | Net Cash |
| Q3 2021 | -7.9x | Net Cash |
PRTA has more cash than debt.
PRTA Weekly Momentum
| Metric | Value | Status |
|---|---|---|
| RSI | 44.3 | Neutral |
| Stochastic | 20.5 | Neutral |
PRTA's weekly RSI is 44 (neutral) and its Stochastic is 21 (neutral).
PRTA PE vs Healthcare Sector
| Metric | PRTA | Sector median | Relative |
|---|---|---|---|
| PE | N/A | 26x | — |
PRTA has no meaningful PE right now: it lost money over the past year.
PRTA Weekly Moving Averages
| Moving average | MA price | Relative |
|---|---|---|
| 8 week MA | $8.34 | 1.3% below |
| 20 week MA | $8.74 | 5.8% below |
| 50 week MA | $9.26 | 11% below |
| 100 week MA | $9.67 | 15% below |
| 200 week MA | $23.8 | 65% below |
PRTA is in a downtrend: it's below all five of its weekly moving averages, and 65% below its 200-week average.
PRTA Yearly ROI
| Year | Start price | End price | ROI |
|---|---|---|---|
| 2020 | $16.0 | $13.2 | -17% |
| 2021 | $13.2 | $48.4 | +265% |
| 2022 | $48.4 | $57.8 | +19% |
| 2023 | $57.8 | $36.3 | -37% |
| 2024 | $36.3 | $15.1 | -58% |
| 2025 | $15.1 | $9.54 | -37% |
| 2026 YTD | $9.54 | $8.23 | -14% |
PRTA has finished three years in a row lower, and it's down 14% so far in 2026.