What it is
Return on equity (ROE) is the ratio of net income to shareholders' equity:
ROE = Net Income (TTM) ÷ Shareholders' Equity
It answers one question: for every dollar of capital shareholders have left in the business, how much profit did management generate? A 20% ROE means $1 of book equity produced $0.20 of profit over the trailing year.
It's a metric Warren Buffett has long emphasized when describing what makes a great business. The reason is structural: a business that can compound at 20% ROE for a decade — without diluting its share count or eroding its moat — will produce dramatically more value than one running at 8%, even with identical revenue growth.
What "good" looks like
ROE is highly sector-dependent, but rough anchors:
- Below 10% is a low-quality signal. The business is barely generating returns above its cost of equity.
- 10–15% is acceptable for slow-growth mature businesses (utilities, basic materials).
- 15–25% is the sweet spot. Compounders that durably print this — Microsoft, Visa, Costco — historically reward patient holders.
- Above 30% deserves a hard second look. Either you've found a genuine wide-moat winner, or the denominator has been compressed (see "Common gotchas").
Why it matters
Three reasons ROE earns a place in our quality pillar:
- It catches capital allocation discipline. A CEO who plows retained earnings into below-cost-of-capital projects will see ROE bleed lower year over year. A CEO who returns cash through dividends/buybacks, or finds high-ROIC projects, will hold the line.
- It correlates with moat durability. Sustained high ROE almost requires some structural advantage — switching costs, network effects, brand pricing power, scale economics. Pure commodity businesses (steel, gold mining, refining) cycle their ROE with the price of their product and rarely sustain >20% across a cycle.
- It's the engine of compounding. Per the DuPont identity:
ROE = Net Margin × Asset Turnover × Equity Multiplier. A business that retains earnings and reinvests at high ROE compounds shareholder capital geometrically.
Common gotchas
- Buyback-driven equity depletion. Companies like Boeing, Lowe's, Philip Morris, McDonald's have bought back so much stock that their shareholders' equity is near zero or negative. Mechanical ROE calculations spike to 100%+ or "n/m" (denominator effectively zero). These are real businesses with real moats; the metric just stopped working. We flag this in the model rather than pretend the 300% ROE is meaningful.
- Leverage masquerading as quality. A company that funds itself with debt can show high ROE just because its equity base is small. Banks routinely run 50:1 leverage and 12% ROE — neither number tells you whether the bank is well-run. Banks and insurers get their own financial-strength score instead, where return on equity is read alongside price-to-book and dividend income rather than on its own.
- One-time gains. A divestiture or a litigation settlement can spike net income for a quarter. TTM ROE then prints elevated for the next three quarters before normalizing. Always cross-check ROE against ROIC (return on invested capital) — if ROE is high and ROIC is mediocre, something accruals-related is doing the work.
- Sector relativity. A 14% ROE is great for a utility and disappointing for software. Compare ROE within sector, not across.
How we use it
ROE isn't one of the five metrics on the grade card (FCF, Rev, D/E, P/E or P/S, PEG), but it feeds the quality-growth score's Quality pillar, and it is on the grade card for banks and insurers. It's central to what the score rewards: a name with high ROE, reasonable growth, and a fair multiple is precisely the "growth at a reasonable price" setup the whole model is built around — statistically rare and historically rewarding.
Bottom line
If you could only check one ratio on a business before you bought it, ROE — properly contextualized for sector and leverage — is the one I'd pick. It's a synthesis of margins, asset efficiency, and capital structure into a single number that tracks moat health over time. Watch it across a full economic cycle; the businesses that hold their ROE through a downturn are the ones worth owning through the next one.
How we score it — and why it isn't the lead
ROE enters the Bull Rankings quality pillar at a weight of 0.8:
| ROE | Score contribution |
|---|---|
| 0% | 0.0 |
| 10% | 0.5 |
| 15% | 0.75 |
| 25%+ | 1.0 |
That is less than half the weight given to ROIC (1.7), and the gap is the point.
ROE divides profit by equity alone. ROIC divides it by debt plus equity. A company can lift its ROE simply by borrowing — replacing equity funding with debt shrinks the denominator and the ratio climbs without the business becoming any better at its job. ROIC is immune to that, because the borrowed money stays in the denominator where it belongs.
So ROE is kept as a corroborating read rather than the lead. When both are high, that's a genuinely strong signal. When ROE is high and ROIC is not, leverage is doing the work.
The cap, and why it exists
ROE above 100% is discarded entirely.
That isn't a judgment that such a company is bad — it's that the number has stopped describing anything. Sustained buybacks steadily reduce book equity, and a company that has returned more to shareholders than its accumulated book value ends up with equity near zero or negative. Divide by a number approaching zero and ROE explodes toward infinity or flips sign. The resulting figure carries no information about business quality.
This affects exactly the companies you'd least want to mis-measure. Buyback-heavy, cash-generative businesses — the kind a quality screen exists to find — are the ones whose book equity gets ground down. Rather than publish a 400% ROE that means nothing, or a negative one that means less, the model withholds it and leans on ROIC, which handles the same companies correctly because debt plus equity stays positive.
What to check before trusting an ROE
- Compare it to ROIC. A wide gap between the two is a leverage story, not a quality story.
- Look at the debt-to-equity ratio beside it. High ROE with high leverage is a different business from high ROE with none.
- Check whether equity is shrinking. A rising ROE against a falling equity base is often buybacks flattering the ratio rather than operations improving.
- Prefer consistency to peak. As with ROIC, one strong year is cheap; several are structural.