- Qualcomm
- Develops, manufactures, licenses and supports digital wireless communications products and services using CDMA technology.
- Quanex Corporation
- Produces steel bars used by original equipment manufacturers (OEMs) to manufacture camshafts, transmission gears, and bearing cages and rollers.
- Quanta Services
- Servicing company to electric and gas utilities and telecom providers. Installs, repairs, and maintains network infrastructure such as electric, gas, cable TV, and telephone and data lines.
- Quest Diagnostics
- Provider of diagnostic testing, information, and services. Site presents news, contact details, and featured lab tests.
- Questar
- Oil and gas corporation engaged in exploration, production, gathering, processing, storage, and wholesale marketing operations.
- Quiksilver Inc.
- Designer, producer, and distributor of clothing, accessories and related products for young and young-minded people.
- Qwest Communications
- A global leader in broadband Internet-based communications; this site offers information about its company, investors, partners, and media services.
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