Lloyd's and Bermuda insurer the Catlin Group is issue an IPO within the next few weeks with an estimated capitalisation of between £700m and £800m, claimed a report.
It said Catlin had declined to comment on the possible IPO but had appointed JP Morgan, Goldman Sachs and UBS as its advisers.
Catlin was founded 20 years ago by Stephen Catlin, the group's chief executive, and had gross written premiums o £636m for 2003, said the report.
The Catlin group currently provides all the capital for Lloyd's Syndicate 2003. It writes approximately 25% of its business outside Lloyd's and has said it expects this to increase to 50% by 2007, said the report.
The group started its Bermuda operations in 2002.