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In page Silicon Valley:

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Silicon Valley is home to many of the world's largest high-tech corporations, including the headquarters of more than 30 businesses in the Fortune 1000, and thousands of startup companies.[citation needed] The Bay Area also accounts for one-third of all of the venture capital investment in the United States, which has helped it to become a leading hub and startup ecosystem for high-tech innovation, although the tech ecosystem has recently become more geographically dispersed.[6][7] It was in Silicon Valley that the silicon-based integrated circuit, the microprocessor, and the microcomputer, among other technologies, were developed.[citation needed] As of 2021, Santa Clara and San Mateo Counties employed about a half million information technology workers.[8]