Google's mission statement: "to organize the world’s information and make it universally accessible and useful"

Microsoft's old mission statement: (Paraphrase) To put a computer on every desk and in every home.

Amazon's mission statement: "...build a place where people can come to find and discover anything they might want to buy online"

These mission statements don't specifically state they want to build a $100B company, but it seems pretty obvious that a company that does the things in their mission statement would be worth $100B.