A former Bank of New York Mellon Corp (BK.N) employee on Friday pleaded guilty to insider trading based on tips from a former Merck & Co Inc (MRK.N) employee about potential pharmaceutical mergers. Federal prosecutors in New York said David Post, 41, a product manager at the bank, received nonpublic information from a former Rutgers Business School classmate about three companies: Idenix Pharmaceuticals, Ardea BioSciences and ViroPharma Inc [VIRO.UL].