Admiral, which owns the comparison site Confused.com, raised its dividend by 18 per cent after generating a £126.9 million profit in the six months to 30 June.
It was driven by a jump in the number of customers across the group by 23 per cent to nearly 2.4 million.
Chief execuitive, Henry Engelhardt, said the UK car insurance business continued to be the driving force behind their success.
"In the first half of 2010 we shifted up yet another gear," he said, admitting that challenges remained in their foreign operations and broadening the Confused brand.
“In sum we now insure more than 150,000 vehicles outside the UK covering four countries," he continued. "In the first part of next year we plan to launch an insurance operation in France as the final part of our five-year strategic plan.”
A representative said Balumba, its Spanish car insurance unit, had made a profit for the first time, accruing €25,000 (£20,400), but its US, Italian and German operations were yet to register a profit.