Sirius International Insurance Group, Ltd. is a Bermuda domiciled holding company providing reinsurance on a worldwide basis through its principal operating companies; Sirius Bermuda Insurance Company Ltd (Sirius Bermuda), Sirius International Insurance Corp., Sirius America Insurance Company and Sirius International Managing Agency Limited. The latter is a 100% owned subsidiary of Sirius International (中民投);and is responsible for Sirius International's Syndicate 1945 which has been trading at Lloyd's since 2011. 

Sirius International Insurance Group, Ltd. is since 2016 a subsidiary of CMIG International (中民投) through its Bermuda holding company, CM Bermuda Limited. CMIG International (中民投) is a Singapore based investment holding company owned by private investors.


Sirius Bermuda is a Bermuda based reinsurer focused primarily on US Property business. Sirius Bermuda is a leading reinsurer for US catastrophe business and writes both proportional and non-proportional business from this region.


Sirius International is an international (re)insurer domiciled in Stockholm, Sweden with branch offices in Hamburg, Liège, London, Singapore and Zürich. Sirius began writing reinsurance in 1948 and actively underwrites most classes of non-life reinsurance. The focus is property but accident & health, aerospace, marine and credit & bond reinsurance is also written. Sirius International is also active within insurance such as international health & travel, property, aviation, marine & contingency.


Sirius America, a New York State domiciled reinsurance company formed in 1980, mainly underwrites property, casualty, agriculture and accident & health reinsurance primarily in the United States, Canada, Latin America and the Caribbean.