Willis Towers Watson PLC on Thursday reported revenue of $2.69 billion in the fourth quarter of 2019, up 13% compared with the year-earlier period, and organic revenue growth of 6%.

In an earnings call with analysts, John Haley, Willis Towers Watson CEO, who is due to retire at the end of the year, also confirmed a new CEO will be named in the second half of the year to “allow for an orderly transition.”

The brokerage delivered “another solid financial performance for the fourth quarter and for the full year,” Mr. Haley said during the earnings call.

Willis Towers Watson’s corporate risk and broking segment reported fourth-quarter revenue of $877 million, up 7% from the prior-year quarter.

Organic revenue growth for the unit was 9%, with North America’s revenues growing by 11% in the quarter primarily “as a result of new business and improved retention,” Mr. Haley said during the call.

The international region’s revenue climbed 13%, compared to the prior year’s quarter. “There was notably strong performance in construction and natural resources in Central and Eastern Europe, Middle East and Africa,” Mr. Haley said.

Western Europe contributed 5% growth, driven by “strong new business” in Iberia and France, he said. Great Britain contributed 6% revenue growth, driven by new business in aerospace and FINEX, he said.

Willis Towers Watson’s investment, risk and reinsurance unit reported revenue of $314 million, up 12% from the prior, and an increase of 12% on an organic basis, with meaningful growth across core businesses.

Reinsurance, with growth of 19%, continued to lead the segment driven by a combination of net new business and strong retention ratio across most lines and regions, he said.

Insurance, consulting and technology grew by 10% from technology product sales and growth in project revenue, he said.

Wholesale revenue increased by 15% on an organic basis, driven by growth across the book, he said. Overall, the wholesale business was up 24%, including the results from London-based broker Miller Insurance Services LLP’s acquisition of Alston Gayler and Co. Ltd.

For the full year of 2019, total revenue was $9.0 billion, an increase of 6% over 2018, with 5% organic revenue growth for the year.

Corporate risk and broking reported full year revenue of $2.95 billion, a 3% increase over 2018.

The brokerage completed the acquisition of Fort Lee, New Jersey-based direct-to-consumer health care organization MG LLC, which does business as Tranzact, in the third quarter of 2019.

Tranzact’s revenue growth exceeded expectations and the business continues to gain momentum, Mr. Haley said.