Mumbai: The five companies born of the Vedanta Ltd demerger may debut on the stock exchanges as early as May, company executives said on Thursday, with three of them bearing the parent company's $6.7 billion debt burden.Billionaire Anil Agarwal-led Vedanta received the much-awaited nod for its mega-demerger from the National Company Law Tribunal in December, over two years after the plan was floated. On Thursday, the Vedanta management said the demerger will take effect on 1 April, and the company aims to h ...