Return on Equity measures how much profit a company generates for every dollar of shareholders' equity. It divides trailing twelve-month net income by average shareholders' equity and is expressed as a percentage. ROE is one of the most widely tracked profitability metrics because it directly measures the return being generated on the capital that shareholders have invested.
A high ROE can indicate genuine operational excellence, but it can also be artificially inflated by leverage. A company that finances its assets heavily with debt will have a smaller equity base, and even a modest net income will produce a high ROE. This is why ROE should always be evaluated alongside leverage ratios — a 25% ROE driven by strong margins is fundamentally different from a 25% ROE driven by 5x leverage.
ROE can be meaningless or misleading for companies with negative equity (due to large accumulated deficits or aggressive buyback programs). In those cases, ROIC is typically a better measure of capital efficiency.