W. R. Berkley Corporation is a commercial lines property & casualty insurance holding company organized in Delaware and based in Greenwich, Connecticut.

[2] The company operates commercial insurance businesses in the United Kingdom, Continental Europe, South America, Canada, Mexico, Scandinavia, Asia and Australia and reinsurance businesses in the United States, United Kingdom, Continental Europe, Australia, the Asia-Pacific region and South Africa.

At that time, the founder owned 23.8% of the company.

[4] In 1994, the company acquired Key Risk Management Services Inc.[5] In 1995, the company acquired the remaining 40% interest in Signet Star from Gen Re.

[7] In August 2006, the company acquired Garnet Captive Services LLC, a San Francisco insurance brokerage and alternative risk consulting firm.