Atrium is a long established leading specialist insurance and reinsurance business, underwriting through Syndicate 609 at Llo ... yds. Atrium operates within the Lloyd’s market and has a history dating back to the 1930s. Atrium is rightly proud of a first class reputation amongst its stakeholders within the insurance market. This is based on unrivalled underwriting and claims expertise, exceptional long term performance and a 'best in class' managing agency. We underwrite a well balanced portfolio, covering a wide range of specialist marine, energy, aerospace, non-marine and liability classes. Based in London and with offices the US we provide access to our underwriting teams through our boxes located in the Lloyd's building as well as our other locations. read more