Companies based in Sunnyvale, California

Yahoo (styled yahoo! in its logo) is an American web portal that provides the search engine Yahoo Search and related services including My Yahoo, Yahoo Mail, Yahoo News, Yahoo Finance, Yahoo Sports, y!entertainment, yahoo!life, and its advertising platform, Yahoo Native. It is operated by the namesake company Yahoo! Inc., which is 90% owned by Apollo Global Management and 10% by Verizon.

Yahoo (styled yahoo! in its logo) is an American web portal that provides the search engine Yahoo Search and related services including My Yahoo, Yahoo Mail, Yahoo News, Yahoo Finance, Yahoo Sports, y!entertainment, and its advertising platform, Yahoo Native. It is operated by the namesake company Yahoo! Inc., which is 90% owned by Apollo Global Management and 10% by Verizon.

Bloom Energy is an American public company headquartered in San Jose, California. It manufactures and markets solid oxide fuel cells that produce electricity on-site. The company was founded in 2001 and came out of stealth mode in 2010. It raised more than $1 billion in venture capital funding before going public in 2018. Its fuel cells are subsidized by government incentive programs for green energy. As of 2020, Bloom had installed about 600 megawatts worth of fuel cells.

Fandango at Home (formerly known as Vudu) is an American digital video store and streaming service owned by Fandango Media, a joint-venture between NBCUniversal and Warner Bros. Discovery. The company offers transactional video on demand rentals and digital purchases of films, as well as integration with digital locker services for streaming digital copies of films purchased as home video at retail.

Abaxis was an American medical technology company that specialized in point-of-care blood testing for both human and veterinary purposes. It is noted for its attempt at developing a portable blood analyzer that can immediately yield data for doctors.

Mellanox Technologies Ltd. (Hebrew: מלאנוקס טכנולוגיות בע"מ) was an Israeli-American multinational supplier of computer networking products based on InfiniBand and Ethernet technology. Mellanox offered adapters, switches, software, cables and silicon for markets including high-performance computing, data centers, cloud computing, computer data storage and financial services.

Proofpoint, Inc. is an American enterprise cybersecurity company based in Sunnyvale, California that provides software as a service and products for email security, identity threat defense, data loss prevention, electronic discovery, and email archiving.

Atari, Inc. was an American video game developer and home computer company founded in 1972 by Nolan Bushnell and Ted Dabney. Atari was a key player in the formation of the video arcade and video game industry.

LinkedIn is a business and employment-focused social media platform that works through websites and mobile apps. It was launched on May 5, 2003 by Reid Hoffman and Eric Ly. Since December 2016, LinkedIn has been a wholly owned subsidiary of Microsoft. The platform is primarily used for professional networking and career development, and allows jobseekers to post their CVs and employers to post jobs. From 2015, most of the company's revenue came from selling access to information about its members to recruiters and sales professionals. LinkedIn has more than 1 billion registered members from over 200 countries and territories.

Radius Inc. was an American computer hardware firm founded in May 1986 by Burrell Smith, Mike Boich, Matt Carter, Alain Rossmann and joined by other members of the original Macintosh team like Andy Hertzfeld. The company specialized in Macintosh peripherals and accessory equipment. It completed its IPO in June 1990.