The WACC of Airports of Thailand PCL (AOT.BK) is 8.5%.
| Range | Selected | |
| Cost of equity | 8.10% - 10.20% | 9.15% |
| Tax rate | 19.90% - 20.10% | 20.00% |
| Cost of debt | 4.00% - 4.50% | 4.25% |
| WACC | 7.6% - 9.5% | 8.5% |
| Category | Low | High |
| Long-term bond rate | 2.6% | 3.1% |
| Equity market risk premium | 7.4% | 8.4% |
| Adjusted beta | 0.74 | 0.79 |
| Additional risk adjustments | 0.0% | 0.5% |
| Cost of equity | 8.10% | 10.20% |
| Tax rate | 19.90% | 20.10% |
| Debt/Equity ratio | 0.12 | 0.12 |
| Cost of debt | 4.00% | 4.50% |
| After-tax WACC | 7.6% | 9.5% |
| Selected WACC | 8.5% | |
The Cost of Equity reflects the return a company needs to deliver to shareholders to justify the risk of investing in its shares. It’s computed using the Capital Asset Pricing Model (CAPM), which blends the risk-free rate, the stock’s beta, and the market risk premium.
This method evaluates the stock’s risk compared to a safe investment and the market’s overall volatility.
Here’s how we figure out the cost of equity for AOT.BK:
cost_of_equity (9.15%) = risk_free_rate (2.85%) + equity_risk_premium (7.90%) * adjusted_beta (0.74) + risk_adjustments (0.25%)
We include the risk adjustments, which range from 0% to 1%, to keep our WACC conservatives, especially for companies traded in developing markets.