The merger of Willis and Towers Watson is now complete and the two firms will operate under the name Willis Towers Watson.
Willis Towers Watson now has 39,000 employees in more than 120 countries and serves 80% of the world's 1,000 largest companies.
The two firms merged in an $18bn (£11.4bn) deal which was first announced in June 2015.
The company advises clients across four businesses: Corporate Risk and Broking; Exchange Solutions; Human Capital and Benefits; and Investment, Risk and Reinsurance.
John Haley, CEO of Willis Towers Watson said: "We intend to help our clients manage risk and engage their people in a whole new way.
"We believe we can change our industry by delivering solutions that are driven by data and analytics, and are integrated, innovative and tailored to meet the evolving needs of our clients."
As previously disclosed, Willis Towers Watson expects to generate $4.7 billion in incremental value for shareholders.
Willis and Towers Watson completed their merger on January 4, 2016.
