Updated August 17, 2026. Quick answer: wide, narrow and none are a judgement about how long a competitive advantage will last, not about how good the company is. Morningstar assigns a wide moat where it expects the advantage to last more than 20 years, and a narrow moat where it expects 10 years. That is the whole scale. A wide-moat company can still be a bad investment at the wrong price — which is why the moat rating is an input to the fair value estimate, not a buy signal.
What the rating actually claims
Morningstar defines the moat itself in one sentence, and it is a sentence about returns rather than about brand or size:
An economic moat (a term coined by Warren Buffett) is what allows a company to earn excess returns on capital for a long period of time and keep competitors at bay.
The three-step scale that follows is where nearly every secondhand explainer goes wrong. In Morningstar’s own words:
A company whose competitive advantages we expect to last more than 20 years has a wide moat. One that can fend off its rivals for 10 years has a narrow moat. A firm with either no advantage or one that we think will quickly dissipate has no moat.
Read that again for what it does not say. It says nothing about profitability, growth, management quality, or whether the shares are worth buying. It is a duration forecast, and the two thresholds are explicit:
| Rating | What Morningstar expects | What it is not |
|---|---|---|
| Wide | Competitive advantages last more than 20 years | Not a claim the stock is cheap |
| Narrow | The company can fend off rivals for 10 years | Not a claim the company is mediocre |
| None | No advantage, or one expected to dissipate quickly | Not a claim the company is failing |
So the gap between wide and narrow is ten years of expected durability. Two companies with identical margins today can sit either side of that line purely on how defensible the analyst thinks those margins are a decade out.
The five sources of a moat
Morningstar does not treat the moat as a vibe. It names five specific mechanisms, and a company’s rating is argued from one or more of them:
Morningstar has identified five sources that create economic moats
| Source | Morningstar’s own definition |
|---|---|
| Network effect | A network effect occurs when the value of a company’s service increases for both new and existing users as more people use the service. |
| Intangible assets | Patents, brands, regulatory licenses, and other intangible assets can prevent competitors from duplicating a company’s products or allow the company to charge higher prices. |
| Cost advantage | Firms with a structural cost advantage can either undercut competitors on price while earning similar margins, or they can charge market-level prices while earning relatively high margins. |
| Switching costs | When it would be too expensive or troublesome to stop using a company’s products, that indicates pricing power. |
| Efficient scale | When a niche market is effectively served by one or only a handful of companies, efficient scale may be present. |
If you are reading a moat rating and cannot identify which of these five is being claimed, you have not yet understood the argument being made.
How much of the market this covers
The rating is analyst-assigned, which bounds how much of the market can carry one. Morningstar’s own annual report to the SEC puts its equity research coverage at approximately 1,600 companies, using a methodology it describes as focused on fundamental analysis, competitive advantage assessment, and intrinsic value estimation.
For context, that is a small fraction of the listed universe. A company with no moat rating has not been judged to have no moat — it has not been covered. Those are different things, and the absence of a rating is not a verdict.
What the moat rating will not tell you
- Whether the shares are cheap. Price is the fair value estimate and uncertainty rating, which are separate ratings.
- Whether a fund holding the company is any good. Fund ratings are a different system entirely — see stock stars versus fund stars.
- How the advantage is trending. Morningstar publishes a separate moat trend assessment; this page does not describe its mechanics, because the methodology document that specifies them sits on a path Morningstar’s own robots file asks crawlers not to fetch, and it was not read.
What it is genuinely good for is framing a question: what, specifically, stops a competitor from doing this? The five sources above are a decent checklist for answering that yourself, on a company nobody has rated.
Sources
- Morningstar, “Economic Moat”, Investing Terms and Definitions. Source document. Read 2026-08-17.
- Morningstar, Inc. Form 10-K for the fiscal year ended December 31, 2025. Filed 2026-02-13. Source document. Read 2026-08-17.
Every figure and quotation on this page was taken from the documents above, each fetched and read on 2026-08-17. Where those documents do not answer a question, this page says so rather than filling the gap.
Look up a company’s moat rating
Morningstar Investor shows the Economic Moat Rating on a company’s page, alongside the fair value estimate and star rating it feeds into.
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