Canva

With a $40bn valuation, Australian graphic design business Canva is one of the biggest privately-owned companies in the world. Husband and wife duo Cliff Obrecht and Melanie Perkins started the company in 2013 and now rank among the top 10 richest people in Australia.Canva started as a tool for amateur designers small businesses, experiencing tremendous growth in its first year by the end of its first year, the company boasted more than 750,000 users.Canvas solutions have grown over time to incorporate video, presentations, websites and, most recently, live collaboration. As of today, the company has over 60 million users in 190 countries and, according to its latest financials, is on course to generate $1 billion in revenue by the end of the year.