Shares of CBIZ (NYSE: CBZ) jumped approximately 17% on Wednesday after Grant Thornton Advisors announced a definitive agreement to acquire the accounting and advisory firm in an all-cash transaction valued at $5 billion. The deal underscores the accelerating consolidation trend reshaping the mid-tier accounting landscape.
Deal Terms and Premium
Under the agreement, CBIZ shareholders will receive $55 per share in cash, representing a premium of about 17.8% over the stock's prior closing price and roughly 54% above its 30-day average trading price. While the offer reflects a substantial premium to recent levels, it remains well below the stock's record high of $88.65 reached in early 2024. The transaction is expected to close during the fourth quarter of 2026, subject to shareholder and regulatory approvals.
Creating the Fifth-Largest US Accounting Firm
The merger combines two of the country's largest mid-market accounting firms, elevating the combined entity to the fifth-largest provider of accounting, tax, and advisory services in the United States. The merged organization is projected to generate nearly $7.5 billion in annual revenue and operate across more than 20 countries and territories. Based on industry rankings from Accounting Today, the combined firm will surpass RSM (which reported approximately $4.9 billion in revenue last year), leaving only the Big Four—Deloitte, EY, KPMG, and PwC—larger in the US market.
Grant Thornton Advisors CEO Jim Peko emphasized the strategic rationale: “By combining our multinational platform with CBIZ's strong market presence, we're broadening our ability to support businesses through every stage of growth — from early development to global scale.” However, Peko told the Financial Times that the firm does not currently aim to challenge the Big Four directly, stating, “We don't have a desire today to try to become one of the Big Five. We believe that we're very good in the target market that we serve. We think that there's tremendous growth opportunity in that market. And we want to go broader and deeper within that market.”
Consolidation Wave in Accounting
The transaction marks the latest chapter in an accelerating consolidation trend among mid-tier accounting firms seeking greater scale to compete with industry giants. Last year, Baker Tilly and Moss Adams completed a combination valued at approximately $7 billion. CBIZ itself significantly expanded through its $2.3 billion acquisition of Marcum in 2024, which transformed it into one of the country's largest accounting firms and the only publicly listed audit firm in the United States. However, the integration of Marcum weighed on earnings, with repeated financial disappointments reducing CBIZ's valuation relative to private equity-backed competitors and ultimately making it an attractive takeover target.
According to the companies, the Grant Thornton-CBIZ deal represents the largest accounting firm combination in more than 25 years, surpassing the consolidation wave that culminated in the 1998 merger between Price Waterhouse and Coopers & Lybrand. For context on recent market-moving M&A activity, see our coverage of Rotork's 67% surge on ABB's record takeover.
Private Equity Backing and Future Structure
Grant Thornton has been pursuing aggressive expansion since receiving investment from a consortium led by private equity firm New Mountain Capital in 2024. New Mountain is providing additional funding to support the CBIZ acquisition. Following completion, Grant Thornton plans to separate CBIZ's benefits and insurance services business into an independent company backed by New Mountain. The agreement also includes a "go-shop" provision allowing CBIZ to solicit competing acquisition proposals until August 27.
CBIZ employs more than 9,500 people across the United States, primarily serving middle-market businesses and individual clients. Grant Thornton said the merger will provide those clients with broader international capabilities through its global network while expanding advisory, tax, and audit offerings across a significantly larger platform. For more on how similar consolidation trends are impacting other sectors, see our analysis of Dell's stock jump on sustained AI demand.
This article is for informational purposes only and does not constitute financial advice.
