$MGK vs $VONG: Mega-Cap Focus or Broader Large-Cap Growth Exposure? Vanguard Mega Cap Growth ETF (MGK) offers concentrated exposure to approximately 56-60 mega-cap growth stocks, while Vanguard Russell 1000 Growth ETF (VONG) provides broader diversification across roughly 370-400 large-cap growth names. Both ETFs are passively managed and track growth-oriented U.S. equity indices with very low expense ratios of 0.05% for MGK and 0.06% for VONG.