The Buffalo Mid Cap Fund commits a substantial portion of its portfolio, specifically at least 80% of its net assets, to various equity investments. These include common stocks, preferred stocks, convertible preferred stocks, warrants, and rights. The fund focuses on businesses designated as 'mid-capitalization' or 'mid-cap' companies. The adviser's definition of a mid-cap company is one whose market capitalization, at the time of purchase, falls within the spectrum defined by the Morningstar US Mid Growth Index.