Chubb Limited is an American company incorporated in Zürich, Switzerland. It is the parent company of Chubb, a global provider of insurance products covering property and casualty, accident and health, reinsurance, and life insurance and the largest publicly traded property and casualty company in the world. Chubb operates in 55 countries and territories and in the Lloyd's insurance market in London. Clients of Chubb consist of multinational corporations and local businesses, individuals, and insurers seeking reinsurance coverage. Chubb provides commercial and personal property and casualty insurance, personal accident and supplemental health insurance, reinsurance and life insurance. In 2018, the group had $174 billion in assets, $30.8 billion of gross written premiums and approximately 31,000 employees. Chubb trades on the NYSE and is a component of the S&P 500 index. Its core operating insurance companies are rated "AA" (Very Strong) for financial strength by Standard & Poor's and "A++" (Superior) by A. M. Best with stable outlooks from both agencies. Fitch rates Chubb Limited and its subsidiaries "AA" (Very Strong) for financial strength, "AA-" for issuer default and "A+" for senior debt. Moody's rates the U.S. companies "A1" and the unsecured loan notes "A3". On 1 July 2015, ACE announced that it would acquire the original Chubb Corporation for $28.3 billion in cash and stock. ACE has committed that Chubb's current headquarters in Warren, New Jersey, USA, will have a substantial portion of the headquarters function for the combined company's North American Division. The combined company adopted the Chubb name in January 2016 after the acquisition was completed. Business structure ACE provides insurance and reinsurance products and services through several operating units. North American ACE USA provides commercial property insurance and casualty (P&C), risk management and accident and health (A&H) coverages through retail brokers. ACE Agriculture offers crop, farm and agribusiness P&C coverages through agents and brokers. ACE Westchester offers commercial P&C excess and surplus lines through wholesale brokers. ACE Bermuda provides liability, property, political risk coverages and captive programs through large international brokers. ACE Private Risk Services offers high-value personal lines coverages through independent agents and brokers. ACE Commercial Risk Services provides specialty small business coverage through agents and brokers. Elsewhere ACE International provides commercial P&C, A&H, and traditional and specialty personal lines through retail brokers, agents and other channels in 51 countries outside North America. ACE Global Markets offers commercial P&C excess and surplus lines and A&H sold by