Vanguard is set to begin trading the “Vanguard S&P Mid-Cap 400 ETF” (NYSE:IVOO) tomorrow September 9th. Vanguard S&P Mid-Cap 400 Index Fund seeks to track the performance of a benchmark index that measures the investment return of mid-capitalization stocks in the United States. Total Annual Fund Operating Expenses will be 0.15%. The Fund employs a “passive management”—or indexing—investment approach designed to track the performance of the S&P MidCap 400 Index. The Index is broadly diversified and measures the performance of stocks of medium-size U.S. 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.