Lenovo Group Ltd. or Lenovo PC International, often shortened to Lenovo, is a Chinese multinational technology company with headquarters in Beijing, China and Morrisville, North Carolina, United States. It designs, develops, manufactures, and sells personal computers, tablet computers, smartphones, workstations, servers, electronic storage devices, IT management software, and smart televisions. Lenovo was the world's largest personal computer vendor by unit sales from 2013 to 2015. It markets the ThinkPad line of notebook computers, IdeaPad, Yoga and Legion lines of notebook laptops, and the IdeaCentre and ThinkCentre lines of desktops. Lenovo has operations in more than 60 countries and sells its products in around 160 countries. Lenovo's principal facilities are in Beijing and Morrisville, with research centers in Beijing, Shanghai, Shenzhen, Xiamen, Chengdu, Nanjing, and Wuhan in China, Yamato in Kanagawa Prefecture, Japan, and Morrisville in the U.S. It also has a joint venture with NEC, Lenovo NEC Holdings, which produces personal computers for the Japanese market. Lenovo was founded in Beijing in November 1984 as Legend and was incorporated in Hong Kong in 1988. Lenovo acquired IBM's personal computer business in 2005 and agreed to acquire its Intel-based server business in 2014. Lenovo entered the smartphone market in 2012 and as of 2014 was the largest vendor of smartphones in Mainland China. In 2014 Lenovo acquired the mobile phone handset maker Motorola Mobility from Google. Lenovo is listed on the Hong Kong Stock Exchange and is a constituent of the Hang Seng China-Affiliated Corporations Index, often referred to as "Red Chips".