Underwriters affiliated with U.S. banks continued to increase their share of the domestic initial public offering market last quarter, bringing 22 companies public-about 50% more than a year earlier.

Overall, banks led 17.2% of the IPOs, based on dollar volume. That's up from 15.8% a year earlier, according to Thomson Financial Securities Data. On the basis of volume, four banks were in the ranks of the top 10 IPO managers, one more than a year ago.

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