Morningstar is renowned by professionals for their research and insights. For us everyday investors, we might recognize their signature 5-star rating system. Big banks love to brag about their stars! But do more stars equal more returns? The rating is fairly simple. Morningstar groups funds with their peers. Funds that have beaten their peers will get 4 to 5 stars, funds that underperformed will get 1 to 2. Based purely on historical data, it doesn't do much in predicting the future. Past 5-star performance doesn't equal future 5-star performance. The Wall Street Journal studied thousands of funds since the star rating's inception (2003-2017) and it was clear that top-performers don't persist. Only 12% of 5-star funds did well enough over the next five years to earn the top rating. 10% of past top funds did so poorly they ended up with an 1-star rating. This is consistent with SPIVA's findings on persistent performance , top performers from one peri...