Prothena Corporation plc (PRTA)
NASDAQ: PRTA · Real-Time Price · USD
9.15
+0.22 (2.46%)
At close: Jun 22, 2026, 4:00 PM EDT
8.97
-0.18 (-1.97%)
After-hours: Jun 22, 2026, 6:05 PM EDT
Prothena Corporation Stock Forecast
Stock Price Forecast
According to 6 analysts polled by S&P Global, Prothena Corporation stock has a consensus rating of "Hold" and an average price target of $21.4. The average 1-year stock price forecast is 133.88% higher than the current stock price, while the lowest is $8.00 (-12.57%) and the highest is $36 (+293.44%).
Price Target: $21.4 (+133.88%)
Analyst Consensus: Hold
* Price targets were last updated on May 9, 2026.
Analyst Ratings
The average analyst rating for Prothena Corporation stock is "Hold". This means that analysts believe this stock is likely to perform similarly to the overall market.
Recommendation Trends
| Rating | Oct '25 | Nov '25 | Dec '25 | Feb '26 | Mar '26 | May '26 |
|---|---|---|---|---|---|---|
| Strong Buy | 1 | 2 | 2 | 2 | 1 | 1 |
| Buy | 3 | 2 | 2 | 2 | 2 | 2 |
| Hold | 2 | 2 | 2 | 2 | 2 | 2 |
| Sell | 1 | 1 | 1 | 1 | 1 | 1 |
| Strong Sell | 0 | 0 | 0 | 0 | 0 | 0 |
| Total | 7 | 7 | 7 | 7 | 6 | 6 |
Latest Forecasts
| Analyst | Firm | Rating | Rating | Action | Price Target | Upside | Date |
|---|---|---|---|---|---|---|---|
| RBC Capital | RBC Capital | Hold Maintains $12 → $13 | Hold | Maintains | $12 → $13 | +42.08% | May 9, 2026 |
| H.C. Wainwright | H.C. Wainwright | Buy Maintains $30 | Buy | Maintains | $30 | +227.87% | May 8, 2026 |
| Piper Sandler | Piper Sandler | Buy Maintains $36 | Buy | Maintains | $36 | +293.44% | May 8, 2026 |
| Citizens JMP | Citizens JMP | Buy Maintains $19 → $20 | Buy | Maintains | $19 → $20 | +118.58% | May 8, 2026 |
| Bank of America Securities | Bank of America Securities | Sell Reiterates $8 | Sell | Reiterates | $8 | -12.57% | May 8, 2026 |
Financial Forecast
Revenue This Year
83.32M
from 9.68M
Increased by 760.40%
Revenue Next Year
22.00M
from 83.32M
Decreased by -73.60%
EPS This Year
0.05
from -3.98
EPS Next Year
-1.31
from 0.05
EPS and Forward PE are based on non-GAAP adjusted numbers.
Revenue Forecast
| Revenue | 2026 | 2027 | 2028 |
|---|---|---|---|
| High | 106.1M | ||
| Avg | 83.3M | ||
| Low | 51.1M |
Revenue Growth
| Revenue Growth | 2026 | 2027 | 2028 |
|---|---|---|---|
| High | 995.5% | ||
| Avg | 760.4% | ||
| Low | 427.7% |
EPS Forecast
| EPS | 2026 | 2027 | 2028 |
|---|---|---|---|
| High | - | ||
| Avg | 0.05 | ||
| Low | - |
EPS Growth
| EPS Growth | 2026 | 2027 | 2028 |
|---|---|---|---|
| High | - | ||
| Avg | - | ||
| Low | - |