Since 2007, when Michael Dell resumed being the company’s CEO, Dell has made more than 10 acquisitions, cut about 10,000 jobs, and hired executives from Motorola and Nike to add more excitement to its product line. Its $3.6 billion purchase of Perot Systems allowed it to expand into higher-margin computing services. Nevertheless, Dell’s stock fell 42% since January 2007, during a period in which Hewlett-Packard’s stock gained 11% and IBM gained 31%.