Flutter Entertainment, formerly PaddyPower Betfair, has reported an 18% increase in revenue for the first six months of the year to £1.02 billion, though profits were down 24% as the company's tax bill grew.
The UK betting company's online offering has seen revenue growth of 8% as more recreational customers gamble on the site.
The group's first-half performance provides evidence of its valuable position in the attractive US and Australia markets, with revenue increases of 16% and 148% respectively.
Flutter Entertainment, parent company of Paddy Power, said it is continuing to prioritise sustainable growth through responsible play. There are market challenges ahead in Q2 with 'switch offs' and responsible gaming measures being introduced in core markets.
Peter Jackson, Chief Executive, said, "We have started to trial the second generation of our responsible gambling model and have been pleased to work with the industry in making a number of commitments to promote responsible gambling, which will improve the sustainability of our industry, even if it impacts sector earnings in the short term."
In the US, customer acquisition investment is likely to lead to an expected EBITDA loss in 2019 of around £55 million.
Mr Jackson said, "We have had another productive six months at Flutter Entertainment. All divisions are performing strongly on an underlying basis and have responded well to the challenges faced. We are pleased with the progress we are making to build a more diversified and sustainable business."
He said, in Europe, Paddy Power's recreational focus and great marketing execution has helped deliver continued growth in customers.
