2013 a big year for IPOs in the U.S.

This is shaping up to be a very good year for IPOs in the U.S.

The number of initial public stock offerings is on pace to increase two-thirds from last year, according to Ernst & Young. Nationally, the number of deals is expected to hit 222 this year from 133 in 2012.

Ernst & Young noted that the IPO market was particularly good for private-equity firms, such as Madison Dearborn Partners, which backed CDW. Nationally, the number of deals is expected to be 94, equal to 2007, the peak year for private equity-backed IPOs. Ernst & Young said 42 percent of all IPOs this year in the U.S. came from private equity-backed companies.