Mar 12, 2020 · Best for small caps: Schwab Small Cap Index Fund (SWSSX) Expense ratio: 0.04%. Details: This fund tracks the Russell 2000 Index, which is focused on around 2,000 of the smallest-cap American companies. This can be a good option if you’re interested in some additional diversification outside of the major companies. At the same time, smaller The Vanguard Institutional Index Fund - Institutional class with an OER of 0.035% - is a separate fund from the Vanguard 500 Index Fund, but is designed to track the S&P 500 Index. 5. Restrictions apply: Online trades of Schwab ETFs™ are commission-free at Charles Schwab & Co., Inc., while trades of certain third-party ETFs are subject to Schwab Small Cap Index Fund (SWSSX) Investors with an interest in small-cap stocks have had great success with the Schwab Small Cap Index Fund (SWSSX). This product is designed to track the Russell 2000 Index, which is comprised of the 2,000 smallest companies on the Russell 3000 Index. The businesses represented are US-based.