Prothena Corporation plc (PRTA)
NASDAQ: PRTA · Real-Time Price · USD
8.20
-0.05 (-0.61%)
At close: Oct 23, 2026, 4:00 PM EDT
9.10
+0.90 (10.98%)
After-hours: Oct 23, 2026, 7:30 PM EDT
Prothena Corporation Stock Forecast
Stock Price Forecast
According to 7 analysts polled by S&P Global, Prothena Corporation stock has a consensus rating of "Buy" and an average price target of $21.4. The average 1-year stock price forecast is 160.98% higher than the current stock price, while the lowest is $8.00 (-2.44%) and the highest is $36 (+339.02%).
Price Target: $21.4 (+160.98%)
Analyst Consensus: Buy
Price Target
Chart* Price targets were last updated on Aug 7, 2026.
Analyst Ratings
The average analyst rating for Prothena Corporation stock is "Buy". This means that analysts believe this stock is likely to outperform the market over the next twelve months.
Recommendation Trends
| Rating | Feb '26 | Mar '26 | May '26 | Jul '26 | Aug '26 | Oct '26 |
|---|---|---|---|---|---|---|
| Strong Buy | 2 | 1 | 1 | 1 | 1 | 2 |
| Buy | 2 | 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 | 6 | 6 | 6 | 6 | 7 |
Latest Forecasts
| Analyst | Firm | Rating | Rating | Action | Price Target | Upside | Date |
|---|---|---|---|---|---|---|---|
| Bank of America Securities | Bank of America Securities | Sell Maintains n/a | Sell | Maintains | n/a | n/a | Aug 14, 2026 |
| Piper Sandler | Piper Sandler | Buy Maintains $36 | Buy | Maintains | $36 | +339.02% | Aug 7, 2026 |
| RBC Capital | RBC Capital | Hold Maintains $13 | Hold | Maintains | $13 | +58.54% | Aug 7, 2026 |
| H.C. Wainwright | H.C. Wainwright | Buy Reiterates $30 | Buy | Reiterates | $30 | +265.85% | Aug 7, 2026 |
| Citizens JMP | Citizens JMP | Buy Maintains $19 → $20 | Buy | Maintains | $19 → $20 | +143.90% | May 8, 2026 |
Financial Forecast
Revenue This Year
82.70M
from 9.68M
Increased by 754.03%
Revenue Next Year
24.38M
from 82.70M
Decreased by -70.53%
EPS This Year
0.64
from -3.98
EPS Next Year
-1.32
from 0.64
EPS and Forward PE are based on non-GAAP adjusted numbers.