The State Street SPDR S&P 400 Mid Cap Value ETF aims to replicate the overall financial performance of the S&P MidCap 400 Value Index, prior to the deduction of any charges or operating costs. This benchmark index is composed of stocks that display the most robust "value" characteristics, which are identified through an assessment of their book value relative to their market price, their earnings in comparison to their market price, and their sales figures against their market price.