Bet365.com is one of the world’s biggest online gambling websites.
Ms Coates founded the Bet365 website in a portable building in a Stoke-on-Trent car park more than 20 years ago.
She has previously been described as one of the UK’s “most successful women” and among the best-paid executives in the world.
Ms Coates achieved a first-class degree in econometrics and later trained as an accountant within the family firm.
She helped build the group into one of the biggest online gambling companies from her father’s bookmaking business.
Her brother John Coates, who is 55 years old, is a co-chief executive of Bet365 and joint-chairman of Stoke City football club.
She is often credited as the driving force behind the business and became managing director of her family’s chain of betting shops at the age of 22.
The Coates family has a combined net worth of around £7.5bn, which put them in 20th position in last year’s Sunday Times Rich List