Nervous debt markets The junk credit markets have in effect closed for business over the summer, with concerns about subprime exposure and the financing of leveraged buy-outs at the forefront. But does any of this actually matter for large quoted companies? The top 1,000 or so quoted companies have, according to UBS, net debt of just 1 times 2007 earnings before interest, tax, depreciation and amortisation. in Public bookmarkswith businessbuy-outsconcernscreditdebteffectfinancingmarketsquoted