Banking executives in Europe have moved to calm investor concerns over private credit risks, as lenders' exposure to the troubled sector re-emerged during earnings season. Barclays revealed a £15 billion ($20.3 billion) exposure to private credit in its first quarter earnings statement on Tuesday. This formed part of an overall structured financing exposure to non-bank financial intermediaries, totaling £66 billion, which also included an additional £1 billion tied to business development companies, a focus of recent stress in the U.S. The U.K. lender said it took a £228 million credit-related hit during the quarter after the collapse of specialist mortgage provider Market Financial Solutions (MFS) in February. C.S. Venkatakrishnan, Barclays' CEO, said the single-name charge, which related to a "well-publicized, sophisticated fraud", was in its securitized products business. The U.K.'s Financial Conduct Authority opened an investigation into MSF in March.…