The Morningstar Mid Cap Index tracks the performance of the middle-capitalization stocks in the Morningstar US Market Index. After the top 70% of stocks are classified as large-cap, the next 20% are classified as mid-cap. Collectively, the Morningstar Mid Cap Index and the Morningstar Large Cap Index represent 90% of the total capitalization of the U.S. stock market.
The returns we publish for the index are total returns, which include reinvestment of dividends. For more information, see the Morningstar Indexes Web site.