The WACC of Spero Therapeutics Inc (SPRO) is 8.2%.
| Range | Selected | |
| Cost of equity | 11.20% - 14.20% | 12.70% |
| Tax rate | 26.20% - 27.00% | 26.60% |
| Cost of debt | 5.00% - 5.00% | 5.00% |
| WACC | 7.4% - 8.9% | 8.2% |
| Category | Low | High |
| Long-term bond rate | 3.9% | 4.4% |
| Equity market risk premium | 4.6% | 5.6% |
| Adjusted beta | 1.59 | 1.66 |
| Additional risk adjustments | 0.0% | 0.5% |
| Cost of equity | 11.20% | 14.20% |
| Tax rate | 26.20% | 27.00% |
| Debt/Equity ratio | 1 | 1 |
| Cost of debt | 5.00% | 5.00% |
| After-tax WACC | 7.4% | 8.9% |
| Selected WACC | 8.2% | |