The Russell 2000 Index has surged nearly 22% this year, posting its best first-half performance since 1991. "It's both a valuation catch-up story and a fundamental story," said Amy Zhang, portfolio ...

Every bull market since 2016 has been a mega cap story. The S&P 500’s gains over the past decade have been driven by a handful of growth giants whose weight in the index keeps expanding. Three growth ...

It is easy to think of artificial intelligence investing as a mega-cap story. After all, the AI boom has been led by some of the largest companies in the market, from chipmakers like Nvidia Corp.