The company - whose clients include Coca-Cola, Fortnite owner Epic Games and Adidas - made £6.8bn in half-year sales and reported a 10.2 per cent increase from the previous year.
Client demand for advertising campaigns and growth in the technology and healthcare sectors pushed up sales, WPP said.
The firm won £2.8bn in new business alone this year, with Audi, Mars and Nationwide all adding to its extensive client list.
It also started working with the parent company of video game Fortnite.
Last year, WPP won the majority of Coca-Cola’s £3.3bn account in the biggest marketing deal in the beverage brand’s history.