As of 2026-04-13, the EV/EBITDA ratio of Prothena Corporation PLC (PRTA) is -1.40. EV/EBITDA ratio is calculated by dividing the enterprise value by the TTM EBITDA. PRTA's latest enterprise value is 257.68 mil USD. PRTA's TTM EBITDA according to its financial statements is -183.99 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 | 7.5x - 15.4x | 11.5x |
| Forward P/E multiples | 8.4x - 14.2x | 11.3x |
| Fair Price | (23.07) - (42.75) | (33.17) |
| Upside | -319.7% - -507.2% | -415.9% |
| Date | EV/EBITDA |
| 2026-04-10 | -1.39 |
| 2026-04-09 | -1.42 |
| 2026-04-08 | -1.44 |
| 2026-04-07 | -1.36 |
| 2026-04-06 | -1.27 |
| 2026-04-02 | -1.21 |
| 2026-04-01 | -1.26 |
| 2026-03-31 | -1.17 |
| 2026-03-30 | -1.03 |
| 2026-03-27 | -1.04 |
| 2026-03-26 | -1.11 |
| 2026-03-25 | -1.05 |
| 2026-03-24 | -0.88 |
| 2026-03-23 | -0.91 |
| 2026-03-20 | -0.89 |
| 2026-03-19 | -0.83 |
| 2026-03-18 | -0.84 |
| 2026-03-17 | -0.96 |
| 2026-03-16 | -1.01 |
| 2026-03-13 | -1.02 |
| 2026-03-12 | -1.05 |
| 2026-03-11 | -1.13 |
| 2026-03-10 | -1.19 |
| 2026-03-09 | -1.20 |
| 2026-03-06 | -1.13 |
| 2026-03-05 | -1.10 |
| 2026-03-04 | -1.21 |
| 2026-03-03 | -1.07 |
| 2026-03-02 | -1.08 |
| 2026-02-27 | -0.87 |
| 2026-02-26 | -0.86 |
| 2026-02-25 | -0.93 |
| 2026-02-24 | -0.95 |
| 2026-02-23 | -0.98 |
| 2026-02-20 | -0.97 |
| 2026-02-19 | -0.97 |
| 2026-02-18 | -0.99 |
| 2026-02-17 | -0.95 |
| 2026-02-13 | -0.95 |
| 2026-02-12 | -0.92 |
| 2026-02-11 | -0.94 |
| 2026-02-10 | -0.95 |
| 2026-02-09 | -0.92 |
| 2026-02-06 | -0.94 |
| 2026-02-05 | -0.77 |
| 2026-02-04 | -0.93 |
| 2026-02-03 | -0.90 |
| 2026-02-02 | -0.94 |
| 2026-01-30 | -0.91 |
| 2026-01-29 | -0.98 |