As Intel mulls a plan to expand its contract-manufacturing operations, the company has lost ground as the world's top semiconductor company to chip suppliers benefitting from the success of mobile devices, according to a study by IC Insights released on Monday. Based on revenue, Intel remained the top semiconductor company, but has lost market share to Samsung and Qualcomm, which design and supply chips for smartphones and tablets. A lot of Intel's chips are being used in PCs, whose sales are falling.