What is the top 10 unicorn in the US?

Could you elaborate on the term "unicorn" in the context of the US, specifically within the realm of finance or cryptocurrency? Are you referring to the top 10 privately held companies in the US that are valued at over $1 billion, often colloquially known as "unicorns"? If so, it's worth noting that the list of these companies can fluctuate rapidly due to funding rounds, acquisitions, and other market factors. Additionally, the specific ranking can vary depending on the source and the criteria used for evaluation. However, I'd be happy to provide an overview of some of the companies that have been consistently mentioned as top unicorns in the US, should that be your inquiry.