BBSC provides exposure to the small-cap segment of the US equity market. It tracks an index that primarily targets those securities that fall between the 95th and 99th percentiles in market capitalization of the US investable universe, although mid-capitalization companies may also be included. The funds equity securities may comprise common stock and real estate investment trusts (REITs). It also allocates its investments across various sectors. As part of the BetaBuilders suite, BBSC provides pure vanilla exposure to small-cap securities and can be used as a complement to BBUS and BBMC, which covers the total market and midcap segments of the US equity market, respectively. Index constituents are rebalanced quarterly.