Breaking down the world's 326 unicorns - privately-held startups valued at over $1 billion - by country, sector, and valuation.
In business, the only constant is change - and for tech companies, this is even more true. Here are the biggest tech companies over 23 years.
A total of 12 of the largest tech giants come from the United States, while eight hail from China. All other countries combine for zero.