The WACC of Martin Marietta Materials Inc (MLM) is 8.9%.
| Range | Selected | |
| Cost of equity | 8.40% - 10.90% | 9.65% |
| Tax rate | 18.60% - 19.20% | 18.90% |
| Cost of debt | 4.00% - 4.60% | 4.30% |
| WACC | 7.8% - 10.1% | 8.9% |
| Category | Low | High |
| Long-term bond rate | 3.9% | 4.4% |
| Equity market risk premium | 4.6% | 5.6% |
| Adjusted beta | 0.99 | 1.07 |
| Additional risk adjustments | 0.0% | 0.5% |
| Cost of equity | 8.40% | 10.90% |
| Tax rate | 18.60% | 19.20% |
| Debt/Equity ratio | 0.13 | 0.13 |
| Cost of debt | 4.00% | 4.60% |
| After-tax WACC | 7.8% | 10.1% |
| Selected WACC | 8.9% | |