Vanguard Explorer Fund Investor Shares 

This fund seeks to identify small and midsize companies with growth potential. Because it focuses on small and mid-size companies, the fund tends to be more unpredictable than stock funds that focus on larger companies. However, the fund’s use of multiple advisors with diverse strategies, and its broad exposure to more than 500 stocks, can help reduce—but not eliminate—risk that may come from investing in this often-volatile segment of the market. This fund may be considered complementary to a well-diversified, long-term portfolio.