F5's customer base has evolved from an initial focus on Internet service providers, Web hosters, and e-commerce sites to a current emphasis on the corporate IT market. Customers include Deutsche Telekom, Citigroup, eBay, General Electric, and General Motors. (Source: Morningstar)

SK Telecom (SKM) - Largest mobile-phone operator in South Korea, with more than 22.3 million customers (50.5% market share). SK also provides wireless services through joint ventures and subsidiaries in the United States, Vietnam, China, and Mongolia. SK also owns approximately 44% of Hanaro Telecom, the country's second-largest fixed-line operator. SK Group, Korea's third-largest conglomerate, owns approximately a quarter of SK Telecom. (Source: Morningstar)

Diebold (DBD) - Builds, sells, and services ATMs, security products and systems, and computerized voting machines. Two thirds of Diebold's revenue comes from the sale and service of ATMs, split about equally between the two. Most of its remaining sales come from security offerings and election systems. (Source: Morningstar)

WNS (WNS) - One of the leading end-to-end providers of outsourced business process outsourcing services to clients in the United States and the United Kingdom. The company was founded in 1996 as an in-house BPO unit of British Airways and started serving third-party clients in fiscal 2003. The company's largest offerings are in the travel (37% of revenue) and financial (39% of revenue) industries. WNS has about 22,000 employees, with almost its entire workforce located in India. (Source: Morningstar)

Maxim Integrated Products (MXIM) - Makes high-performance analog and mixed-signal integrated circuits. The company offers a wide range of products serving a host of analog-intensive applications, including power management and data conversion. Maxim supplies its diverse array of about 5,000 circuits to a broad base of customers in end markets including communications, computing, industrial, and consumers. Roughly 70% of the firm's sales are based outside the U.S. (Source: Morningstar)

Corning (GLW) - Leading designer and manufacturing of glass and ceramic substrates found in liquid crystal displays, fiber-optic cables, automobiles, and laboratory products. The company has five primary divisions--display technologies, telecommunications, environmental technologies, specialty materials, and life sciences--but most of its revenues stem from its display technologies and telecommunications segments, which generated about 45% and 30% of sales, respectively. (Source: Morningstar)

Siemens (SI) - A diversified global manufacturer operating in three sectors; industry, energy, and healthcare. About 54% of revenue comes from the industrial segment, which features Siemens automation and drive technologies. Within the energy segment, Siemens produces turbines used in a variety of power plant applications. (Source: Morningstar)