Return on equity is the single number Warren Buffett checks before almost anything else, yet most screeners use it carelessly. A 35% ROE can signal a wide-moat compounder or a balance sheet loaded with debt. The difference between those two outcomes is what separates disciplined screening from chasing a ratio.
What ROE Actually Measures
Return on equity divides net income by shareholders' equity. If a company earns $200 million on $1 billion of equity, its ROE is 20% — meaning every dollar shareholders have invested generates 20 cents of annual profit. It answers a precise question: how efficiently does management convert the capital owners have entrusted to it into earnings?
For context, the long-run median ROE for the S&P 500 sits around 12-15%. Anything sustained above 20% is genuinely strong, and businesses that hold 25%+ for a decade are rare compounding machines. But ROE is a ratio with two moving parts. A company can lift it by earning more or by shrinking its equity base — through buybacks or debt. That second path is where screeners get trapped, which is why the raw number alone is never enough.
The DuPont Breakdown: Where ROE Really Comes From
The DuPont formula splits ROE into three drivers: net profit margin, asset turnover, and financial leverage (assets ÷ equity). ROE = margin × turnover × leverage. This decomposition tells you why a company's ROE is high, not just that it is.
Consider two firms both posting 24% ROE. The first earns it through a 22% net margin and modest 1.1x leverage — a high-quality, lightly geared business. The second posts a thin 6% margin but runs 3.5x leverage, borrowing aggressively to inflate the headline figure. The first is a compounder; the second is fragile and will crater in a downturn. When you screen, pair an ROE filter with a debt-to-equity ceiling — say below 1.5 — to strip out leverage-juiced numbers. Genuine operating excellence shows up as high margins and efficient asset use, not borrowed capital.
Practical Screening Thresholds
Start with a floor of 15% ROE to clear the market median, then tighten depending on your goal. For quality compounders, demand 20%+ ROE sustained across the last five years, not a single strong quarter. Consistency matters more than a one-year spike, which often reflects an asset sale or tax windfall.
- Floor screen: ROE above 15%, debt-to-equity below 1.5
- Quality screen: ROE above 20% for 5 consecutive years, net margin above 12%
- Elite compounder: ROE above 25%, positive free cash flow, share count flat or shrinking
Always cross-check ROE against return on invested capital (ROIC). When ROIC tracks close to ROE, the returns are real and not a leverage illusion. A wide gap — ROE far above ROIC — is a warning that debt is doing the heavy lifting.
Where ROE Breaks Down
ROE fails in two situations screeners must respect. First, companies with negative equity — often after massive buybacks or accumulated losses — produce meaningless or wildly distorted ROE figures. A firm with $50 million net income and negative equity can show a nonsensical reading; exclude negative-equity names from ROE screens entirely.
Second, ROE is nearly useless for comparing across sectors. Banks and insurers naturally run 10-12% ROE because they're capital-heavy and regulated, while asset-light software firms routinely clear 30%+. Screening a regional bank against a SaaS company on raw ROE will always favor the software name, regardless of management quality. Compare ROE only within a sector, and benchmark each candidate against its industry median rather than the broad market. Used this way, ROE surfaces the best operators inside a peer group instead of just the least capital-intensive business models.
Building an ROE Screen That Works
The strongest approach layers ROE with confirming filters rather than treating it as a standalone signal. Combine a 20% ROE floor with debt-to-equity under 1.5, five years of consistency, and positive free cash flow. That stack filters out leveraged balance sheets, one-off windfalls, and accounting profits that never convert to cash. On a universe of several thousand US stocks, this typically narrows the list to a few dozen genuine quality names worth deeper research.
DeltaScreener lets you set all of these filters at once — ROE thresholds, debt limits, margin floors, and multi-year consistency checks — across the full US market in seconds. Build your high-ROE quality screen at deltascreener.com/screener and turn a misunderstood ratio into a reliable filter for durable, well-run businesses.