Romi Savova is the founder and chief executive of pension firm PensionBee.
Grace Smith used hypnosis to give up smoking, and it inspired her to take up the profession.
Christian Kroll is the boss of Ecosia, which donates 80% of its profits to tree-planting projects.
Shahrzad Rafati is the boss of internet video technology firm BroadbandTV.
US firm Blk & Bold has seen sales surge this year on the back of the Black Lives Matter movement.
Jules Miller set up dietary supplements firm The Nue Co after suffering irritable bowel syndrome.
Zebedee Management represents disabled models and actors around the world.
German friends Mirco Wiegert and Lorenz Hampl launched best-selling Fritz-Kola in 2003.
When Tata Harper was setting up her US cosmetics brand, she was told it would never work.
How Kimberlee Perry grew trampoline fitness company Bounce, which is aimed at women.
Sir Jack Petchey built a huge property empire and his own charity, but it was not all plain sailing.
Louise Hill is the founder of GoHenry, which provides prepaid debit cards for children.
How Michelle Doherty overcame her skin problems and launched skincare business Alpha-H.
Remi Clermont is the founder and boss of cycling clothing firm Cafe du Cycliste.
How lost love inspired Justin McLeod to set up popular dating app Hinge.
Luis Onofre's luxury shoes are sold worldwide, and Michelle Obama and Paris Hilton are fans.
Andrew Day, the CEO of games developer Keywords Studios, tries not to play the titles himself.
The US entrepreneur started her business career answering the phone, and went on to lead Hewlett-Packard.
Patrick Coveney, is the boss of the UK's largest sandwich maker of pre-packaged sandwiches.
As Argentina remains mired in economic crisis it is a difficult place to do business, but one firm shows that success is possible.
