Willis Towers Watson plc is a British-American multinational advisory, broking and solutions company. Its operations span commercial insurance brokerage and risk advisory, employee benefits and rewards consulting, retirement and actuarial services, and investment advice for pension funds and institutional investors. The company is legally domiciled in Ireland and has its principal executive offices at the Willis Building in London. In 2024 WTW reported revenue of US$9.93 billion and employed about 48,900 people. Following completion of the Willis Group - Towers Watson merger, the company was added to the S&P 500 index in January 2016. WTW ranks among the largest global insurance brokers by revenue.