Grant Thornton Advisors has announced its intent to acquire CBIZ for $5 billion, a move that is set to significantly expand its presence in the U.S. accounting market and create a top-five firm in the industry. The acquisition marks the largest deal in the accounting sector in over 25 years and is supported by New Mountain Capital. Following the announcement, shares of CBIZ surged nearly 17% as investors reacted to the deal. Despite CBIZ reporting a revenue dip in its second-quarter financial results, the acquisition signals strong confidence in its future potential. The merger will also position Grant Thornton to effectively compete with the Big Four firms, as it seeks to enhance its service offerings in the mid-market segment.