Here's even a more informative blurb from Yahoo Finance:
Wistron manufactures by design. The company is a contract manufacturer of computer and consumer electronics products, including notebook computers, desktop PCs, servers, LCD TVs, and set-top boxes. It is organized into four business groups: digital consumer, enterprise, mobile, and services. Wistron also offers design services, prototyping, compliance and reliability testing, and supply chain management. The company focuses on providing services to large computer firms such as Dell, Hewlett-Packard, and Microsoft. Wistron is one of the world's largest producers of notebook computers. The company gets more than two-thirds of its sales from exports.