Using Morningstar for ETF Research
Morningstar's star rating tells you how a fund performed; its analyst (Medalist) rating is the forward-looking call. Confusing the two is the most common research mistake.
Don't have time? Here's what you need to know:
- 1Morningstar's star rating is backward-looking (past risk-adjusted return); the Medalist rating is the forward-looking call.
- 2Star ratings have weak predictive power; Morningstar's own research finds expense ratio predicts future returns better.
- 3For index ETFs, weight cost and tracking quality above the star count, and use stars only to weed out chronic laggards.
- 4Morningstar vets individual funds well, but use a portfolio view to check overlap and whether the mix fits your goals.
Two Ratings That Mean Different Things
Morningstar is one of the most widely used sources of independent fund research, and the first thing to understand is that it publishes two ratings people constantly conflate. The star rating (one to five stars) is purely backward-looking: it ranks a fund's past risk-adjusted return against peers in the same category. It tells you how a fund did, not how it will do. By Morningstar's own design, it's a quantitative summary of history, nothing more.
The analyst rating, branded the Medalist Rating (Gold, Silver, Bronze, Neutral, Negative), is the forward-looking view. It reflects an assessment of the fund's process, the parent firm, and, crucially, its cost, with low fees a major positive factor. For index ETFs especially, this rating leans heavily on expense ratio and how faithfully the fund tracks its benchmark. Reading the star rating as a buy signal is the classic error; stars describe the past, medals attempt to describe the future.
| Rating | Direction | Based on | Best used for |
|---|---|---|---|
| Star rating (1-5) | Backward-looking | Past risk-adjusted return vs peers | Seeing how a fund has done |
| Medalist (Gold-Negative) | Forward-looking | Process, parent, people, cost | A view on future prospects |
What to Actually Read on a Fund's Page
Beyond the ratings, a Morningstar fund page carries the data that genuinely informs a decision. The expense ratio sits front and center, and for index funds it's the most reliable predictor of relative performance. The portfolio section shows holdings, sector weights, and concentration, so you can see what you actually own. For bond funds, it surfaces duration and credit quality; for stock funds, it shows the value/growth and size tilt.
Two Morningstar-specific features are worth learning. The category classification places the fund among true peers, so a five-star small-cap fund is being compared to other small-cap funds, not the whole market. And the 'Portfolio X-Ray'-style analysis, which inspired many similar tools, breaks a fund down by asset class, sector, and even individual stock exposure, which is how you spot that two funds you own overlap heavily. These data points matter more than any single rating.
Tip: For index ETFs, weight the expense ratio and tracking record above the star count. Stars measure a past that low-cost index funds don't depend on a manager to repeat.
The Limits of Star Ratings
Morningstar's own research, and outside studies, have repeatedly shown that star ratings have weak predictive power for future returns. Funds with five stars don't reliably outperform afterward, partly because strong past performance often reflects a style being in favor, which tends to reverse. The one fund characteristic that does predict future performance reasonably well is cost, and Morningstar itself has published research concluding that the expense ratio is a better predictor than its own star rating.
There's also a category-gaming subtlety: a fund can earn five stars by being the best of a weak category, while a different category entirely is the better place to invest. Stars compare within a box, not across boxes. Use the star rating as a quick filter to weed out chronic underperformers, then make the actual decision on cost, holdings, and how the fund fits your overall allocation, not on the star count alone.
Important: Five stars is not a buy signal. Star ratings are backward-looking and have weak predictive power; Morningstar's own research finds the expense ratio predicts future returns better than its stars do.
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Where Morningstar Fits in Your Research
Morningstar is excellent for vetting a single fund in depth, understanding its holdings, costs, category, and risk profile. It's less suited to answering portfolio-level questions like whether your funds overlap or whether your overall stock/bond mix matches your risk tolerance. For those, you combine fund-level research with a portfolio view.
A sensible workflow: use a screener to generate candidates, use Morningstar (or a comparison tool) to vet each finalist's cost and holdings, then check how the chosen funds combine. The Portfolio X-Ray shows your true asset-class and sector exposure across every account at once, and the Compare Any tool handles direct head-to-heads. Morningstar tells you whether a fund is good; the portfolio tools tell you whether it's good for you.
Frequently Asked Questions
What's the difference between Morningstar's star rating and analyst rating?
The star rating (one to five) is backward-looking; it ranks a fund's past risk-adjusted return against category peers. The analyst rating, the Medalist Rating from Gold to Negative, is forward-looking and reflects the fund's process, parent firm, and cost. Stars describe how a fund did; medals attempt to describe how it may do going forward, so they answer different questions.
Should I buy a fund just because it has five stars?
No. Star ratings are purely historical and have weak predictive power for future returns; Morningstar's own research has found the expense ratio predicts future performance better than its stars. Use the star count as a quick filter to avoid chronic underperformers, then decide on cost, holdings, and how the fund fits your overall allocation.
What should I look at on a Morningstar ETF page besides the rating?
Focus on the expense ratio, the holdings and sector concentration, the category classification that defines its true peer group, and, for index funds, how closely it tracks its benchmark. For bond funds, check duration and credit quality. These data points inform a decision far more than any single rating, especially for low-cost index ETFs.
Is Morningstar's research enough on its own?
It's excellent for vetting an individual fund's cost, holdings, and risk, but it doesn't answer portfolio-level questions like whether your funds overlap or whether your overall mix fits your risk tolerance. Pair fund-level research with a portfolio view: vet each fund on Morningstar, then check how your chosen funds combine across all your accounts.
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Alex Harrington
CFA Level II Candidate, Finance & Economics
Alex Harrington is an independent ETF researcher and personal finance writer with over 8 years of experience analyzing exchange-traded funds. A CFA Level II candidate with a background in economics, Alex has reviewed 800+ ETFs and helped thousands of beginners build their first investment portfolios through clear, jargon-free education.
This content is for educational purposes only and does not constitute financial advice. Past performance does not guarantee future results. Consult a licensed financial advisor before making investment decisions.