Vanguard Mid-Cap ETF offers diversification beyond mega-cap tech with low fees and mid-sized growth exposure.

The Vanguard Mid-Cap ETF (VO) targets U.S. companies valued between $2 billion and $20 billion, filling a gap left by S&P 500 funds heavily weighted in mega-cap tech stocks. While mid-caps have underperformed large caps over the past decade, VO provides portfolio diversification and growth potential by holding hundreds of mid-sized companies, which tend to be more economically sensitive and less concentrated in AI-driven sectors. VO's low expense ratio of 0.04% makes it a cost-effective option for investors seeking exposure to this 'middle market' segment, typically recommended as 10-15% of an equity portfolio for balanced growth rather than income.