The fund invests primarily in common stocks. It invests at least 80% of assets in stocks of companies with small market capitalizations (which, for purposes of this fund, are those companies with market capitalizations similar to companies in the Russell 2000® Index or the S&P SmallCap 600® Index). The adviser allocates its assets across different market sectors (at present, communication services, consumer discretionary, consumer staples, energy, financials, health care, industrials, information technology, materials, real estate, and utilities), using different Fidelity managers.