A former director of sales for U.S. chipmaker Qualcomm Inc pleaded guilty in San Diego on Thursday to insider trading, officials said. Derek Cohen, 52, admitted that he netted about $200,000 from a series of stock and options trades made after learning that the company planned to buy Atheros Communications in 2011, a statement from the U.S. Attorney’s Office in San Diego said. As knowledge of pending Atheros acquisition spread within Qualcomm, Cohen spent about $430,000 on stock and call options.