11+ Software Companies In Silicon Valley UK . Insights about top trending companies, startups, investments and m&a activities, notable investors of these companies, their management team, and recent news are also included. These companies have at least 50 employees, are headquartered in silicon valley and span nearly every industry. Adobe Systems Headquarters In Silicon Valley Stock Editorial Photo C Wolterke 46375931 from st.depositphotos.com Visit business insider's homepage for more stories. In this article we are going to list the 15 biggest companies that originated in silicon valley. Click to skip ahead and jump to the 5 biggest companies that originated in silicon valley. Another gem of silicon valley, adobe is a multinational software company headquartered in san jose, california. Apply to software developer, software engineer, senior software engineer and more! Below ...