Vanguard S&P Mid-Cap 400 Growth ETF(AMEX:IVOG)

IVOG draws stocks from the S&P MidCap 400 (commonly known as S&P 400) based on three factors: sales growth, valuations and momentum. Although the fund targets US midcaps, it starts selecting constituents further down the market-cap spectrumIVOG excludes some big midcap holdings, thereby tilting toward smaller firms. The fund's portfolio also has a slightly less growth exposure than some peer funds, as its holdings may overlap with core funds or even value funds. Sector tilts abound as IVOG may heavily overweight some sectors like financials and underweight others like consumer cyclicals. The index is weighted by float-adjusted market cap and rebalanced on a quarterly basis.