Return on Equity (ROE)

Return on Equity (ROE) measures how efficiently a company generates profits from shareholders' investment. It's one of Warren Buffett's favorite metrics for evaluating management effectiveness. The formula is Net Income divided by Shareholders' Equity, multiplied by 100.

For example, if a company has $50 million in net income and $250 million in shareholders' equity, its ROE would be 20%. This means the company generates $0.20 profit for every $1 of equity invested.

When interpreting ROE, values above 20% are generally considered excellent if sustainable, 15-20% is very good, 10-15% is average, 5-10% is below average, and below 5% is poor and warrants investigation.

The DuPont Analysis breaks down ROE into three components: Profit Margin (Net Income divided by Revenue) measuring profitability, Asset Turnover (Revenue divided by Assets) measuring efficiency, and Financial Leverage (Assets divided by Equity) measuring debt usage. High ROE can come from high profit margins and efficient asset use (both positive), or from high leverage (risky).

Important considerations when analyzing ROE: always compare within the same industry, recognize that high debt inflates ROE artificially, understand that negative equity makes ROE meaningless, watch for one-time items that can distort the ratio, and track trends over multiple years rather than focusing on a single year. ROE differs from ROA (which measures return on total assets) and ROIC (which measures return on invested capital). Look for companies with consistently high ROE of 15% or more achieved through operations, not excessive debt.