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Yahoo! Inc Case Study Yahoo! Inc. (YHOO) 701 First Ave. Sunnyvale, California 94089-1019 United States (408) 731-3300 Fax: (408)731-3301 Business Services: Internet search engine, audio and video streaming, store hosting and management, and Web site tools and services. Variant Names Four11 Corp. – Merger Viaweb Inc. – Merger 1998/06/01 HYPERparallel Inc. – Merger 1998/12/01 Launch.