Trenwick Managing Agents (TMA) is up for sale, after its parent, Trenwick, revealed plans to withdraw from the market.
Trenwick currently provides $333m (£207m) of Syndicate 839's capacity for 2003. It provides $4m (£2.5m) of Syndicate 44's 2003 capacity.
Marston Becker, Trenwick CEO and acting chairman, said: "Over the past two years, Michael Watson and the management team at TMA have successfully repositioned Syndicate 839.
"It is now a focused, profitable Lloyd's underwriter with market leading franchises in a number of key segments including aviation, homeowners, financial institutions and professional indemnity insurance, as well as treaty reinsurance and certain specialty insurance classes.
"The business is currently benefiting from very attractive market conditions, which are likely to continue into the next several years. Because of its in-depth knowledge of the Lloyd's market and the unique business opportunities there, we believe that the TMA management team is well placed to source the capital for the future operation of the TMA managed syndicates and ensure the continuity of the business."