Vanguard Mid-Cap Growth ETF (the Fund) is an exchange-traded share class of Vanguard Mid-Cap Growth Index Fund, which employs a passive management or indexing investment approach designed to track the performance of the MSCI US Mid Cap Growth Index (the Index). The Index is a diversified index of growth stocks of medium-size United States companies. The Fund attempts to replicate the target Index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. The Fund may invest, to a limited extent, in stock futures and options contracts, warrants, convertible securities and swap agreements. The Fund’s investment manager is Vanguard Quantitative Equity Group.