This fund typically allocates at least 80% of its assets to common stocks that are components of the Fidelity U.S. Total Investable Market Index. This comprehensive index is engineered to reflect the performance of the entire U.S. stock market, covering companies of all sizes, from large-cap to mid-cap and small-cap. Its weighting system prioritizes companies based on their market value, specifically accounting for shares that are freely available for public trading (float-adjusted).