ASUSTek Computer Inc. (/ˈeɪsuːs/;[3] Chinese: 華碩電腦股份有限公司; pinyin: Huáshuò Diànnǎo Gǔfèn Yǒuxiàn Gōngsī; stylised as ASUSTeK or ASUS) is a Taiwanese[4] multinational computer and phone hardware and electronics company headquartered in Beitou District, Taipei, Taiwan. Its products include desktop computers, laptops, netbooks, mobile phones, networking equipment, monitors, wi-fi routers, projectors, motherboards, graphics cards, optical storage, multimedia products, peripherals, wearables, servers, workstations, and tablet PCs. The company is also an original equipment manufacturer (OEM).

Asus is the world’s 5th-largest PC vendor by unit sales as of January 2021.[5] Asus appears in BusinessWeek’s “InfoTech 100” and “Asia’s Top 10 IT Companies” rankings, and it ranked first in the IT Hardware category of the 2008 Taiwan Top 10 Global Brands survey with a total brand value of $1.3 billion.[6]

The company has a primary listing on the Taiwan Stock Exchange under the ticker code 2357 and a secondary listing on the London Stock Exchange under the ticker code ASKD.

The company was founded in Taipei in 1989[11] by T.H. Tung, Ted Hsu, Wayne Hsieh and M.T. Liao,[12] all four having previously worked at Acer as hardware engineers. At this time, Taiwan had yet to establish a leading position in the computer-hardware business. Intel Corporation would supply any new processors to more established companies like IBM first, and Taiwanese companies would have to wait for approximately six months after IBM received their engineering prototypes. According to company history, Asus created a motherboard prototype for using an Intel 486, but it had to do so without access to the actual processor. When Asus approached Intel to request a processor to test it, Intel itself had a problem with its own 486 motherboard. Asus solved Intel’s problem and it turned out that Asus’ own motherboard worked correctly without the need for further modification. Since then, Asus was receiving Intel engineering samples ahead of its competitors.[13][14]