By Karlee Weinmann (January 7, 2014, 3:32 PM EST) -- London private equity firm BC Partners is looking for $400 million in loans to back its $624 million purchase of financial news service Mergermarket, currently owned by publishing giant Pearson PLC, a source told Bloomberg on Tuesday. The buyer is raising a $246 million seven-year loan and a second eight-year loan of roughly half that size. The financing also includes a $40 million revolving credit line. BC Partners, which already owns a string of other financial news and data operations, unveiled its plans to pick up Mergermarket in November. Pearson had been looking to unload the asset for months prior to that announcement. UBS AG, HSBC Holdings PLC and Mizuho Bank Ltd. are arranging the financing....