As of 2026-10-04, the Relative Valuation of Prothena Corporation PLC (PRTA) is (3.15) USD. This relative valuation is based on P/E multiples. With the latest stock price at 8.36 USD, the upside of Prothena Corporation PLC based on Relative Valuation is -137.7%.
The range of the Relative Valuation is (2.76) - (11.26) USD.
Note: valuation result may not be accurate due to the company's negative earnings.
| Range | Selected | |
| Trailing P/E multiples | 2.7x - 14.9x | 3.4x |
| Forward P/E multiples | 3.3x - 13.4x | 4.1x |
| Fair Price | (2.76) - (11.26) | (3.15) |
| Upside | -133.0% - -234.7% | -137.7% |
| Date | P/E |
| 2026-09-30 | -9.97 |
| 2026-09-29 | -10.45 |
| 2026-09-28 | -10.38 |
| 2026-09-25 | -9.87 |
| 2026-09-24 | -9.90 |
| 2026-09-23 | -10.33 |
| 2026-09-22 | -10.70 |
| 2026-09-21 | -10.13 |
| 2026-09-18 | -10.21 |
| 2026-09-17 | -10.07 |
| 2026-09-16 | -9.81 |
| 2026-09-15 | -9.91 |
| 2026-09-14 | -10.54 |
| 2026-09-11 | -10.63 |
| 2026-09-10 | -10.73 |
| 2026-09-09 | -11.07 |
| 2026-09-08 | -11.35 |
| 2026-09-04 | -11.69 |
| 2026-09-03 | -11.42 |
| 2026-09-02 | -11.53 |
| 2026-09-01 | -11.44 |
| 2026-08-31 | -11.13 |
| 2026-08-28 | -11.10 |
| 2026-08-27 | -10.82 |
| 2026-08-26 | -11.01 |
| 2026-08-25 | -11.21 |
| 2026-08-24 | -11.17 |
| 2026-08-21 | -11.25 |
| 2026-08-20 | -10.75 |
| 2026-08-19 | -11.05 |
| 2026-08-18 | -10.36 |
| 2026-08-17 | -10.57 |
| 2026-08-14 | -10.54 |
| 2026-08-13 | -10.81 |
| 2026-08-12 | -11.02 |
| 2026-08-11 | -10.97 |
| 2026-08-10 | -10.85 |
| 2026-08-07 | -10.42 |
| 2026-08-06 | -10.21 |
| 2026-08-05 | -10.10 |
| 2026-08-04 | -10.10 |
| 2026-08-03 | -9.91 |
| 2026-07-31 | -9.66 |
| 2026-07-30 | -10.01 |
| 2026-07-29 | -10.19 |
| 2026-07-28 | -10.19 |
| 2026-07-27 | -10.35 |
| 2026-07-24 | -10.41 |
| 2026-07-23 | -10.15 |
| 2026-07-22 | -10.04 |