The market for U.S. initial public offerings began the year well, and it's picking up steam quickly, with June delivering the most number of public debuts in more than a decade. The year is poised to produce the highest IPO volume since the frothy dot-com era, which peaked in 2000. Middle-market companies are playing a huge role.

"The IPO market is red hot," says Neil Dhar, the U.S. leader of the capital markets practice group of PricewaterhouseCoopers. There were about 160 IPOs in the first half of 2014, compared to 238 in all of 2013 and 146 for 2012, he points out.

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