A secondary offering by certain shareholders of TransUnion has been upsized to 22.5 million common shares from 20 million common shares. The underwritten offering has also been priced, the company said in a news release.

The shares will be offered for sale in one or more transactions on the NYSE, in the over-the-counter market, through negotiated transactions or otherwise at market prices prevailing at the time of sale, at prices related to prevailing market prices or at negotiated prices.

Further, some of the selling stockholders have granted the underwriters an option to purchase up to 3,375,000 additional common shares. The company is not selling any shares in the offering, which is expected to close Aug. 4. Based on TransUnion's July 31 closing price of $45.83 and assuming the underwriters fully exercise their option, S&P Global Market Intelligence calculates a gross offering size of about $1.19 billion.

J.P. Morgan, Bank of America Merrill Lynch and Morgan Stanley are acting as underwriters.