Morningstar, a trusted rating agency for mutual funds and exchange-traded funds (ETFs), has a significant influence on the financial markets. A study by Vanguard reported that Morningstar's ratings are not reliable predictors of future performance, despite being widely used by financial industry giants, such as the Financial Industry Regulatory Authority (FINRA).
Morningstar's rating system is based on a quantitative analysis of a fund’s previous performance and should not be considered a future performance predictor. To perform a thorough analysis, investors are recommended to review other key metrics, such as expense ratios and holdings.
Research has shown that Morningstar's ratings have a noticeable impact on investment patterns. Between 1998 and 2010, funds with Morningstar's high 4-star and 5-star ratings saw a steady net positive investment flow, while 1-3 star rated funds experienced negative net investment flow.
It's important to distinguish between fund flows and fund performance. A fund can attract significant investments with a few good performing years but fail to match those early achievements. Morningstar encourages investors not to depend solely on star ratings, stressing that these ratings are relative to other funds' past performances.
Investors should not overlook the revelation that many high-rated funds in 2004 had lower scores in 2014. In fact, the lowest-rated funds at times generated the highest returns compared to their style benchmarks. Due to its sole reliance on average past returns, the Morningstar system is incapable of accounting for deviations such as abnormal yearly performance or a change in fund managers.
Morningstar rank mutual funds and ETFs on a peer-adjusted, risk-adjusted basis, and each fund's performance is relative to the risks assumed to obtain those returns. A system of ratings has been established that awards the top 10% of categorized funds with five stars, while the remaining funds are divided into four descending star categories. Morningstar often charges a fee to publicize these ratings.
A large proportion of investors base their investment decisions on Morningstar’s ratings. However, by the time the fund achieves a five-star rating, the opportunity for significant gains may have already passed.
A Wall Street Journal analysis in 2014 revealed that of all the five-star funds listed by Morningstar in 2004, only 14% maintained their five-star ratings in 2014, with the majority suffering a drop.
Vanguard’s 2013 analysis found that regardless of the rating at the time of selection, an investor had less than 50% probability of choosing a fund that would outperform its benchmark. Surprisingly, one-star funds generated the highest excess returns.
A 2010 study by Russel Kinnel, director of manager research at Morningstar, compared the predictive accuracy of star ratings against the simple expense ratios. He found that low-cost funds consistently beat high-cost funds in every measure, and the star ratings could not match the performance prediction accuracy of the expense ratios.
In conclusion, Morningstar's rating system is a reflection of a fund's past performance rather than a predictor of future performance. Investors should use the system as a preliminary analytical tool, combined with other key factors like expense ratios, before making any investment decisions.