Credit reporting agency TransUnion hopes to raise $325 million through an initial public offering, the company said in Securities and Exchange Commission filings Tuesday. The Chicago-based company, which is owned by the Pritzker family and private equity firm Madison Dearborn Partners, plans to use proceeds to reduce debt. For the first quarter, TransUnion reported a loss of $25.5 million, or 85 cents per share, on revenue of $245.9 million, down substantially from earnings of $20.8 million, or 33 cents per share, a year earlier. "We have a substantial amount of indebtedness," the company said in the filing, listing total debt of $1.6 billion as of March 31, with $645 million of senior notes, $950 million due under a senior secured credit facility, and $11.2 million of other debt. The company did not specify the number of shares it plans to offer in the IPO. The other two major credit reporting agencies — Equifax Inc. (EFX) and Experian PLC — already trade publicly, with shares of Dublin-based Experian trading on the London Stock Exchange. Write to Kerri Panchuk.