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Quality Factor Investing: How to Find and Score Quality Stocks

October 27, 2026
Quality Factor Investing: How to Find and Score Quality Stocks

Quality factor investing is the practice of favoring companies with strong, durable fundamentals: high profitability, stable earnings, and low debt. It does this instead of chasing whatever is cheap or whatever is rising. Academic work defines a high-quality company as one that is safe, profitable, growing, and well-managed. You can apply it through a factor fund or by screening and scoring individual stocks yourself. This guide covers the definition, the measures behind a quality score, what the research shows, where it breaks down, and how to weigh quality against price.

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TL;DR

  • The quality factor tilts a portfolio toward profitable, financially sound companies with steady earnings and modest debt.
  • Common building blocks are return on invested capital (ROIC), return on equity (ROE), return on assets (ROA), earnings quality, and leverage.
  • Research finds quality stocks earned strong risk-adjusted returns, but the evidence has limits, and quality can lag for long stretches.
  • Quality and price are separate questions. Pairing quality with a sensible valuation is the idea with the most support.
  • You can use quality through funds or by scoring individual stocks, and either way you need to know what is being measured.

Table of Contents

What quality factor investing means

In factor investing, a factor is a characteristic that has been associated with differences in stock returns. The five equity style factors most often discussed are value, size, momentum, volatility, and quality. Quality is usually described as low debt, stable earnings growth, and strong profitability, which may give a company resilience when the economy weakens.

The most cited academic definition comes from Frazzini, Pedersen, and Asness. Their paper describes quality stocks as safe, profitable, growing, and well-managed. Those four words are a useful checklist:

  • Safe: low leverage, low earnings volatility, low financial distress risk.
  • Profitable: high margins and high returns on capital.
  • Growing: profits and cash flow that expand over time.
  • Well-managed: sensible use of capital, steady payouts, and honest accounting.

The same paper notes that these stocks often command higher prices yet have still delivered superior risk-adjusted returns. That tension between quality and price is the core of the topic, and we come back to it below.

How it differs from value investing

Value investing asks whether a stock is cheap relative to what the business is worth. Quality investing asks whether the business itself is strong. A company can be both, either, or neither. A cheap stock with collapsing margins and heavy debt is a value-looking trap. An excellent business at a very high multiple is quality without a margin of safety.

Some research suggests the two work best together. One study found that quality is not a factor that reliably commands a premium on its own, but that value investing conditioned on quality indicators looks promising. That is close to how many classic value investors think: buy good businesses at fair or low prices.

How quality is measured

There is no single official formula. Index providers and researchers each pick their own measures and weights. What they share is a focus on three families of numbers.

Profitability and returns on capital

The most common measures of company quality are ROIC, ROE, and ROA. Each answers a slightly different question:

  • ROIC shows how much operating profit a company earns on the money invested in the business, from both shareholders and lenders. Our complete guide to return on invested capital walks through the calculation.
  • ROE shows profit relative to shareholders' equity, but it can look inflated when a company funds itself with a lot of debt. A DuPont breakdown splits ROE into margin, asset turnover, and leverage so you can see what is really driving it.
  • ROA shows profit relative to everything the company owns.

If you compare across industries, return on capital employed is another useful lens, and our overview of profitability ratios covers margins as well.

Earnings quality

Profit that does not turn into cash deserves suspicion. Earnings quality checks whether reported income is backed by cash flow, or propped up by accruals and one-off items. The earnings quality checklist on our blog shows practical checks you can run from a company's filings.

Leverage and financial health

A business that earns a high return but carries crushing debt is fragile. Quality screens therefore look at debt levels, interest coverage, and balance sheet strength. Our financial health analysis guide covers the ratios worth checking.

From measures to a score

Index methodology shows how this turns into a number. One published index ranks each quality attribute by percentile and then combines them into a weighted quality score, using profitability, earnings quality, and leverage among its measures. The principle is simple: rank every company on each measure, blend the ranks, and sort.

You can do the same at home. If you want to see how a scoring system is built and read, start with what a stock scoring system is.

What the research shows

The headline result is that a long-short portfolio, buying high-quality stocks and shorting low-quality ones, earned significant risk-adjusted returns in the United States and across 24 developed countries. The data in that paper run through 2012.

Other work points to a defensive side. Quality has been described as persistent, and high-quality stocks have tended to be less volatile and to suffer smaller drawdowns in periods of financial distress, based on analysis through mid-2013.

Two cautions apply when you read these results:

  1. They are historical. The studies cited end in 2012 and 2013. Past factor behavior does not guarantee future returns.
  2. Long-short results are not what you earn. A paper portfolio that shorts junk is not the same as owning a basket of quality stocks with real costs.

Risks and limits of a quality approach

Quality is not a free lunch. Be honest with yourself about these points before you build a strategy around it.

Quality can fade. Regulatory disclosures for quality funds warn that securities previously identified as having quality characteristics may not remain quality companies, and that quality investing may fall out of favor. Funds can also differ from their index because of expenses and trading costs, particularly at rebalancing.

Quality can be expensive. Strategies face valuation risk, since high-quality stocks may command premium prices, and growth sensitivity, meaning they may lag during speculative rallies.

Quality is hard to pin down. Brand strength, management capability, and competitive advantage are not always observable. Narrow screens can also exclude young companies that are reinvesting heavily, and those can be tomorrow's quality names.

Factors are cyclical. Factor returns have been cyclical and have underperformed the overall market for long periods. Trying to time that is risky: one large fund firm says factor timing is extremely difficult and generally ill-advised, and stresses long-term patience.

A factor tilt is an active bet. Factor indexes depart from a neutral market-cap starting point, so they represent an active view. If you hold one, you are choosing to be different from the market, and you can be wrong.

Sector matters too. Businesses with swings tied to the economy can look high quality at the peak and poor at the trough. Our piece on sector cyclicality and rolling beta shows one way to spot that.

Quality versus price

This is the question behind "price vs quality investing." A wonderful company bought at any price is not automatically a good investment, and a bargain is not automatically a bargain.

The research gives a nuanced picture:

A practical way to use this is a two-step filter. First, keep only companies that clear a quality bar. Second, among those, favor the ones whose valuation is not stretched relative to peers. Reading a valuation signal quickly is covered in how to read a value rating in under a minute.

A worked example of the logic

Imagine two hypothetical companies in the same industry. Company A earns a high return on invested capital, has low debt, and converts most profit into cash. Company B has thin margins, rising debt, and profit that mostly sits in receivables. Company B trades at a much lower multiple.

A pure value screen favors B. A quality screen favors A. A combined approach asks whether A's premium is reasonable, and whether B's discount is fair compensation for its risk. Often the answer is that A deserves a premium, but not any premium. If A's price already assumes flawless growth for a decade, you are paying for the quality in advance. That is why quality and valuation belong in the same decision, not in separate silos.

Funds or individual stocks?

There are two broad ways to apply quality.

Quality funds and indexes. These follow rules to hold a basket of high-scoring stocks and rebalance on a schedule. Factor exposure can be delivered passively through transparent, cost-effective indexes. But how the portfolio is built matters: the choice between cap-weighted and signal-weighted construction can materially change exposure, tracking error, and capital efficiency. Two funds with "quality" in the name can behave differently. Read the methodology and fees before buying.

Scoring individual stocks. You pick the measures, review the businesses, and hold a concentrated portfolio. This gives you control and a better understanding of what you own. It also demands time and discipline, and your portfolio can drift far from any benchmark.

Many investors combine both: a broad index core, plus individually researched positions where they have conviction. Whichever you choose, understand that a score is a starting point for research, not a verdict.

Funds or individual stocks? — overview diagram

A simple quality checklist you can run today

If you want to screen a stock without a spreadsheet, work through these steps in order:

  1. Check returns on capital. Is ROIC or ROE consistently strong, not just in one good year?
  2. Check the source of ROE. Use a DuPont breakdown to see whether it comes from margins or from leverage.
  3. Check cash conversion. Does operating cash flow roughly support reported earnings over several years?
  4. Check the balance sheet. Is debt manageable relative to earnings and interest costs?
  5. Check stability. Have profits held up in a downturn, or do they swing wildly?
  6. Check the price. Compare the valuation with similar companies and with the company's own history.
  7. Compare side by side. Put two or three candidates next to each other using a few metrics, as in our template for comparing stocks.

Treat the result as a shortlist. Then read the company's filings and understand its competitive position before you buy.

Our perspective

We built Oracle Investments around a belief that quality and value are two halves of the same job, and that most individual investors do not need a black box to do that job. Our ratings are rule-based and grounded in reported company fundamentals. We avoid AI or model-driven guesswork, and we show the scoring inputs so you can see why a company scores the way it does.

That matters for quality in particular. Quality is a fuzzy word, and it gets abused: a fund label, a marketing claim, a feeling about a brand. When a score is open to inspection, you can disagree with it, adjust your own view, and learn something. We would rather you understand why a stock scores well on profitability and financial health than trust a number blindly.

We also think the old masters still have a lot to teach. The ideas associated with Warren Buffett, Charlie Munger, and Peter Lynch, such as owning durable businesses, respecting the balance sheet, and refusing to overpay, line up closely with what factor researchers later tried to formalize. We include that educational content in the app because discipline is harder than data. Numbers tell you what is true about a company. Patience decides whether you benefit.

One honest warning from us: no score removes risk. A high-quality company can still be a poor purchase at the wrong price, and a strong quarter can hide a weak trend. Use scores to narrow your list, then think.

— Matt

Scoring quality stocks in the Oracle app

If you would rather not build spreadsheets, Oracle Investments scores more than 260 stocks on fundamentals such as profitability, valuation, and financial health, and lets you compare companies side by side. You can use it to see which businesses clear a quality bar and whether the price looks reasonable, and to track your portfolio as you go. The subscription is Premium Annual, purchased through the Apple App Store. You can learn more at the Oracle Investments home page.

FAQ

What is the quality factor definition in simple terms?

The quality factor refers to the tendency of financially strong companies to behave differently from weaker ones. These companies typically have high profitability, stable earnings, and low debt. Researchers describe them as safe, profitable, growing, and well-managed.

What are the five factors in factor investing?

The five widely used equity style factors are value, size, momentum, volatility, and quality. Each captures a different characteristic associated with return differences between stocks. Quality is the one focused on balance sheet strength, earnings stability, and profitability.

Is a quality score the same as a value score?

No. A quality score measures how strong the business is, while a value score measures how cheap the stock is relative to what the business earns or owns. A company can score high on one and low on the other. Looking at both together helps you avoid paying too much for quality or buying a cheap company that is cheap for good reason.

Can quality stocks underperform?

Yes. Factor returns are cyclical, and quality strategies can lag, especially during speculative rallies when lower-quality stocks surge. Quality companies can also lose their advantages over time. That is why a long-term view and attention to valuation both matter.

Sources