Two private equity investors have agreed to buy TransUnion Corp.

Advent International and GS Capital Partners VI Fund LP will buy the credit bureau from its current stockholders, including Madison Dearborn Partners and the Pritzker family business interests.

TransUnion, of Chicago, said on Friday that the deal values it at more than $3 billion, though it did not disclose the exact financial terms. The acquisition is expected to close in the first half of the year.

TransUnion president and chief executive Bobby Mehta and the rest of the company's leadership team will remain with it.

GS Capital Partner makes private equity investments for Goldman Sachs & Co. and others.

Madison Dearborn is a private equity investment firm based in Chicago. Penny Pritzker, whose family founded the Hyatt hotel chain and once owned a Chicago area bank, is chairman of TransUnion.