Profits at Ashers Baking Company topped £1.5 million last year, a record annual increase of more than £170,000.
In 2014, the McArthur family who own and run Ashers, turned down the cake order because they said the slogan on the cake would conflict with their Christian belief that marriage is between a man and a woman.
That's when The Equality Commission for Northern Ireland sued them. The bakery lost the legal fight a year later.
The judge claimed the company broke sexual orientation and political discrimination laws.
The family appealed the judge's ruling, but the Court of Appeal maintained the decision.
According to the Christian Institute, which is backing Ashers Baking Company, the McArthur family is in the process of appealing to the UK Supreme Court.
