IBM

International Business Machines, abbreviated IBM, is a multinational computer, technology and IT consulting corporation headquartered in Armonk, North Castle, New York, United States. The company is one of the few information technology companies with a continuous history dating back to the 19th century. IBM manufactures and sells computer hardware and software (with a focus on the latter), and offers infrastructure services, hosting services, and consulting services in areas ranging from mainframe computers to nanotechnology. It has been nicknamed "Big Blue" for its official corporate color.

IBM has been well known through most of its recent history as the world's largest computer company and systems integrator. With over 407,000 employees worldwide, IBM is the largest and most profitable information technology and services employer in the world according to the Forbes 2000 list with sales of greater than 100 billion US dollars. IBM holds more patents than any other U.S. based technology company and has eight research laboratories worldwide.The company has scientists, engineers, consultants, and sales professionals in over 200 countries. IBM employees have earned five Nobel Prizes, four Turing Awards, nine National Medals of Technology, and five National Medals of Science. As a chip maker, IBM has been among the Worldwide Top 20 Semiconductor Sales Leaders in past years.


HEWLETT PACKARD

Hewlett-Packard, commonly referred to as HP, is an information technology corporation headquartered in Palo Alto, California, USA. HP is one of the world's largest information technology companies and operates in nearly every country. HP specializes in developing and manufacturing computing, data storage, and networking hardware, designing software and delivering services. Major product lines include personal computing devices, enterprise servers, related storage devices, as well as a diverse range of printers and other imaging products. HP markets its products to households, small to medium size businesses and enterprises both directly, via online distribution, consumer-electronics and office-supply retailers, software partners and major technology vendors.


DELL

Dell Inc. is a multinational information technology corporation that develops, sells and supports personal computers and other computer-related products, as a merchant . Based in Round Rock, Texas, USA Dell employed more than 76,500 people worldwide as of 2009.

Dell grew during the 1980s and 1990s to become (for a time) the largest seller of PCs and servers. At the end of 2009, it held the third spot in computer sales within the industry behind Hewlett-Packard and Acer Inc. As of 2009, the company sold personal computers, servers, data storage devices, network switches, software, and computer peripherals. Dell also sells HDTVs, cameras, printers, MP3 players and other electronics built by other manufacturers.

In 2006, Fortune magazine ranked Dell as the 25th-largest company in the Fortune 500 list, 8th on its annual "Top 20" list of the most-admired companies in the United States. In 2007 Dell ranked 34th and 8th respectively on the equivalent lists for the year. A 2006 publication identified Dell as one of 38 high-performance companies in the S&P 500 that had consistently out-performed the market over the previous 15 years.