With a history dating back to the 1930s, Atrium has established a first-class reputation in the insurance market based on its unrivaled underwriting and claims expertise, exceptional long-term performance, and a best-in-class managing agency. They offer a well-balanced portfolio covering various specialist classes such as marine, energy, aerospace, non-marine, and liability. Atrium has offices in London and the US, providing access to their underwriting teams through their locations, including the Lloyd's building. They are authorized by the Prudential Regulation Authority and regulated by the Financial Conduct Authority and the Prudential Regulation Authority.