Grant Thornton International has agreed to acquire US-based professional services firm CBIZ in a transaction valued at approximately $5 billion.
The deal marks the most significant consolidation in the accountancy industry since the formation of the Big Four in 1998, signaling a major shift in the competitive dynamics of the global audit and advisory market.
The acquisition allows Grant Thornton to significantly expand its footprint in the United States, the world's largest market for professional services.
By integrating CBIZ's extensive network of offices and client base, Grant Thornton aims to challenge the market share held by the larger firms, particularly in the mid-market segment where competition is intensifying.
Industry observers note that the move reflects a broader trend of consolidation among mid-tier accounting firms seeking scale to compete with the Big Four.
The deal is expected to create a more formidable rival capable of offering a wider range of services and leveraging greater resources to win large contracts.