By Maksym Lytvynov, Founder of AlphaStocks | Last updated: March 2026
Buffett Quality Investing: Owner Earnings, Moats, and ROE
Berkshire Hathaway's compound annual return since 1965: 19.8%. The S&P 500 over the same period: 10.2%. The gap comes down to one repeatable discipline — Buffett buys businesses with high returns on equity, stable margins, and durable competitive advantages, then holds them while management compounds capital. AlphaStocks translates that discipline into a quantitative model that drives 65% of the Quality axis.
What Are Owner Earnings?
In his 1986 letter to Berkshire Hathaway shareholders, Buffett introduced the concept of owner earnings as a more honest measure of business profitability than reported net income. The formula strips away accounting noise and approximates the cash a business truly generates for its owners:
Owner Earnings = Net Income + D&A + SBC - CapExNet Income (NI)
The starting point — bottom-line profit as reported on the income statement.
Depreciation & Amortization (D&A)
Added back because it is a non-cash charge. The physical wear on assets is real, but the cash was already spent when the asset was purchased.
Stock-Based Compensation (SBC)
Added back because it is a non-cash expense. However, SBC dilutes shareholders, which is why AlphaStocks penalizes excessive SBC separately in the buyback discipline check.
Capital Expenditures (CapEx)
Subtracted because this is real cash the business must spend to maintain its productive capacity. Without CapEx, earnings would eventually disappear.
Owner earnings yield — owner earnings divided by market capitalization — tells you what percentage of your purchase price the business generates in real cash each year. A company with an owner earnings yield of 8% is returning 8 cents of real cash for every dollar of market value.
Why ROE Consistency Matters More Than ROE Level
A single year of 25% ROE can be achieved through financial engineering, asset sales, or one-time windfalls. Buffett looks for companies that sustain high ROE over five or more years because consistency signals a structural advantage, not a temporary spike.
AlphaStocks measures ROE over a rolling 5-year window. Companies that maintain ROE above 15% with low standard deviation score highest. A company like Apple (AAPL) with consistently high ROE scores better than a cyclical firm that oscillates between 5% and 30%, even if the cyclical firm's average ROE is similar.
How Is a Competitive Moat Measured Quantitatively?
Buffett famously seeks businesses with “wide moats” — durable competitive advantages that protect profits from erosion. While moats are often discussed qualitatively (brand power, network effects, switching costs), AlphaStocks measures their financial fingerprint:
| Metric | What It Reveals |
|---|---|
| Gross margin stability (5yr) | Pricing power and cost advantage durability |
| Operating margin trend | Whether the company is gaining or losing competitive ground |
| ROE standard deviation | Earnings predictability — low volatility signals a structural moat |
| Revenue growth consistency | Demand durability across economic cycles |
A company does not need to score perfectly on every metric. The model looks for a pattern of stability and gradual improvement — the financial signature of a business that competitors cannot easily replicate.
Share Buyback Discipline
Buffett views share buybacks as a positive signal only when management repurchases shares below intrinsic value. Buying back overpriced stock destroys value. AlphaStocks evaluates buyback discipline by comparing the share count trend against the company's valuation at the time of repurchase.
Companies that consistently reduce their share count while maintaining or growing owner earnings receive a boost. Companies with heavy SBC-driven dilution that offsets buybacks receive a penalty. The net effect is captured in the “capital allocation efficiency” component of the Buffett quality score.
How AlphaStocks Uses the Buffett Quality Model
In the AlphaStocks composite scoring system, the Buffett-style quality assessment accounts for 65% of the Quality axis. The Quality axis itself carries 40% of the total composite weight, making the Buffett model responsible for approximately 26% of the final score — the single largest contributor.
It is paired with the Piotroski F-Score (35% of Quality), which catches short-term financial deterioration. The Buffett model captures long-term competitive durability. Together, they provide a complete picture of business quality from both a trailing and structural perspective.
Quality = Buffett Quality × 0.65 + Piotroski F-Score × 0.35Sector Adaptations
The owner earnings formula works well for general industrial and technology companies, but it breaks down for financial institutions. AlphaStocks addresses this with sector-specific scoring profiles:
| Sector | Adaptation |
|---|---|
| Banks | Owner earnings replaced by P/B ratio + ROE, since banks lack meaningful CapEx and D&A |
| Insurers | Float-adjusted book value and combined ratio replace traditional owner earnings |
| REITs | FFO (Funds From Operations) used instead of net income in the owner earnings calculation |
| Utilities | Rate-regulated earnings stability weighted higher than growth metrics |
| Asset Managers | AUM-adjusted profitability accounts for market-driven revenue swings |
| General | Standard owner earnings formula: NI + D&A + SBC - CapEx |
For example, Berkshire Hathaway (BRK.B) falls under the holdings profile, where the model accounts for the conglomerate structure and evaluates subsidiary earnings quality rather than applying a single-company framework.
Limitations
The Buffett quality model favors mature, profitable businesses. High-growth companies that reinvest aggressively — reporting low or negative net income despite strong revenue growth — will score poorly on owner earnings even if they are building significant economic value.
Additionally, ROE can be artificially inflated by high leverage. A company with minimal equity and large debt may show impressive ROE that disappears the moment credit conditions tighten. AlphaStocks mitigates this by incorporating the Piotroski leverage signals and by examining ROE volatility, not just its level.
As with any single model, the Buffett quality assessment is most effective when combined with valuation, momentum, and timing signals in a multi-model composite.
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This article is for educational purposes only. AlphaStocks provides algorithm-generated research tools, not personalized investment advice. The Buffett quality model is one component of a multi-factor scoring system. Past performance does not guarantee future results. Always conduct your own due diligence and consult a qualified financial adviser before making investment decisions. Data sourced from SEC EDGAR filings.