The No. 1 company on this year's list is San Mateo cloud-based data warehousing unicorn Snowflake Computing. It has risen fast in the three years that LinkedIn has been doing this list, going from No. 38 in 2017 to No. 20 last year and the top of the ranking this year. Local newcomers on the ranking are San Francisco-based mobility business Lime at No. 12, self-driving vehicle tech startups Zoox (Foster City) at No. 16, Aurora Innovation (Palo Alto) at No. 18 and Voyage (Palo Alto) at No. 35. --By