Threadneedle Asset Management said its insurance business (TIAM) saw record mandate wins of over £360m in the first quarter of 2004.
It said the wins came from five new clients including Lloyd's managing agents and captive insurers.
The majority of assets will be invested in UK fixed income with smaller amounts in US fixed income and pooled equity funds.
Head of insurance asset management Madeline Forrester said: “We have built up considerable experience and expertise in providing appropriate solutions for insurance clients and have used this expertise to approach clients in different areas of the markets since the relaunch of the division.
“We are delighted with the growing success of the business and now that Threadneedle is part of American Express, one of the world's major financial service brands, we hope to add further substantial names to our client list in the coming months.”
Threadneedle was bought by American Express last year for a reported $570m.
