As of 2025-05-22, the EV/EBITDA ratio of Prothena Corporation PLC (PRTA) is 0.37. EV/EBITDA ratio is calculated by dividing the enterprise value by the TTM EBITDA. PRTA's latest enterprise value is -50.81 mil USD. PRTA's TTM EBITDA according to its financial statements is -137.96 mil USD. Dividing these 2 quantities gives us the above PRTA EV/EBITDA ratio.
Note: valuation result may not be accurate due to the company's negative EBITDA.
| Range | Selected | |
| Trailing P/E multiples | 8.7x - 14.3x | 10.9x |
| Forward P/E multiples | 9.0x - 16.2x | 11.3x |
| Fair Price | (15.40) - (28.89) | (20.68) |
| Upside | -325.9% - -523.5% | -403.3% |
| Date | EV/EBITDA |
| 2025-05-21 | 0.39 |
| 2025-05-20 | 0.18 |
| 2025-05-19 | 0.14 |
| 2025-05-16 | 0.23 |
| 2025-05-15 | 0.41 |
| 2025-05-14 | 0.34 |
| 2025-05-13 | 0.07 |
| 2025-05-12 | 0.06 |
| 2025-05-09 | 0.13 |
| 2025-05-08 | 0.26 |
| 2025-05-07 | 0.18 |
| 2025-05-06 | 0.16 |
| 2025-05-05 | -0.12 |
| 2025-05-02 | -0.29 |
| 2025-05-01 | -0.37 |
| 2025-04-30 | -0.56 |
| 2025-04-29 | -0.75 |
| 2025-04-28 | -0.74 |
| 2025-04-25 | -0.76 |
| 2025-04-24 | -0.74 |
| 2025-04-23 | -0.71 |
| 2025-04-22 | -0.69 |
| 2025-04-21 | -0.60 |
| 2025-04-17 | -0.56 |
| 2025-04-16 | -0.58 |
| 2025-04-15 | -0.71 |
| 2025-04-14 | -0.85 |
| 2025-04-11 | -0.96 |
| 2025-04-10 | -0.75 |
| 2025-04-09 | -0.97 |
| 2025-04-08 | -1.06 |
| 2025-04-07 | -1.20 |
| 2025-04-04 | -1.21 |
| 2025-04-03 | -1.39 |
| 2025-04-02 | -1.71 |
| 2025-04-01 | -1.55 |
| 2025-03-31 | -1.80 |
| 2025-03-28 | -2.10 |
| 2025-03-27 | -2.05 |
| 2025-03-26 | -2.19 |
| 2025-03-25 | -1.91 |
| 2025-03-24 | -2.18 |
| 2025-03-21 | -2.03 |
| 2025-03-20 | -1.99 |
| 2025-03-19 | -2.00 |
| 2025-03-18 | -1.98 |
| 2025-03-17 | -2.33 |
| 2025-03-14 | -2.33 |
| 2025-03-13 | -2.46 |
| 2025-03-12 | -2.38 |