According to new data from the company, the figure jumped from $226.6 million in the opening six months of 2008 to $292.3 million during the same period this year.
Earnings per share at the business rose 54.4 per cent to 58c, while there was a 54.5 per cent jump in profit after tax, which climbed to a record high of $275.5 million.
Chief executive Charles Philipps said that the company is "exceptionally well-positioned" to continue to perform well once the market begins to rebound following the economic downturn.
"We have already benefited from improvements in catastrophe-exposed lines," he remarked, adding that the opening half of 2009 has been an "excellent" one for Amlin.
The company's share price increased as a result of the new figures, rising 26.8c at 08:34 BST following the announcement to $6.13.
Written by Claire Archer