Dell Inc. (NASDAQ: DELL) (SEHK: 4331), a United States-based computer hardware company, develops, manufactures, supports and markets a wide range of personal computers, servers, data storage devices, network switches, personal digital assistants (PDAs), software, peripherals and more. It employs more than 63,700 people worldwide as of 2006. According to the Forbes 500 2005 list, Dell ranks as the 28th-largest company in the United States by revenue. In 2005, Fortune magazine ranked Dell as No. 1 on its annual list of the most-admired companies in the United States, displacing Wal-Mart, which had held the top spot for the previous two years and fell to No. 4. Dell Inc. has its corporate headquarters in Round Rock, Texas in the United States.