Grant Thornton Advisors announced on Monday the successful completion of its $5 billion acquisition of CBIZ, a move poised to elevate the Chicago-based firm to the fifth-largest accounting firm in the United States by revenue, trailing only the esteemed "Big Four" global accounting giants. This landmark transaction, originally unveiled in late July, represents the most substantial deal in the public accounting sector in over two decades, marking a significant consolidation within an industry historically characterized by organic growth and smaller strategic alliances. The last comparable mega-merger occurred in 1998 when Coopers & Lybrand combined with Price Waterhouse to form PricewaterhouseCoopers, a pivotal event that contributed to the current dominance of the Big Four – Deloitte, PwC, Ernst & Young, and KPMG.
The integration of CBIZ into Grant Thornton Advisors is strategically designed to bolster the latter’s international, cross-border capabilities. Grant Thornton Advisors operates within a vast network of member firms spanning more than 25 countries and territories under the Grant Thornton International umbrella. The acquisition significantly amplifies this global reach, with the combined entity projecting an annual revenue exceeding $7 billion. This expanded platform will now encompass a workforce of over 34,500 professionals distributed across key economic regions including the Americas, Europe, the Middle East, and the Asia-Pacific. The combined entity will operate under the unified Grant Thornton brand, adopting an integrated business model aimed at delivering seamless client service. Jim Peko will continue to serve as the Chief Executive Officer of Grant Thornton Advisors and will lead its multinational platform, a testament to the continuity and leadership within the expanded organization.
A Strategic Merger Driven by Complementary Strengths
In a statement released on November 2, Jim Peko articulated the strategic rationale behind the merger, emphasizing the synergy between the two organizations. "Today, we bring together two firms with complementary capabilities and a shared commitment to incredible client service," Peko stated. He further elaborated on the enhanced value proposition: "CBIZ’s strong U.S. relationships and industry knowledge, combined with our expertise, multinational reach, and investment in technology, give us a powerful formula for serving clients no matter how complex their needs. Our focus now is on bringing together the best of both organizations to help our clients achieve even greater success while opening new paths for our people to grow and thrive." This sentiment underscores a client-centric approach, aiming to leverage the combined strengths to address the increasingly intricate demands of businesses in a globalized economy.
The financial implications of this transaction are substantial. With the closing of the acquisition, CBIZ is now fully integrated into Grant Thornton Advisors. As a consequence, CBIZ’s common stock, previously traded under the ticker symbol CBZ on the New York Stock Exchange, has ceased trading. Notably, CBIZ had held the distinction of being the only publicly traded accounting services provider in the United States, a fact that highlights the shift in its corporate structure and ownership.
Investment and Restructuring: A New Chapter for Grant Thornton

The acquisition follows a significant strategic move by Grant Thornton earlier in 2024. In June, the firm sold a majority stake to New Mountain Capital, a private equity firm. This partnership initiated an alternative practice structure for Grant Thornton. Grant Thornton LLP, the licensed CPA firm, continues to provide attest services, while Grant Thornton Advisors now focuses on business advisory and non-attest services. New Mountain Capital’s commitment to supporting this growth is evident, with plans to inject incremental equity to facilitate the CBIZ acquisition.
Andre Moura, Managing Director at New Mountain Capital, expressed enthusiasm for the expanded platform, stating, "This transaction significantly expands a platform that already had strong momentum, fueled by exceptional talent, leading AI resources, and deep access to capital. We’re proud to support Grant Thornton Advisors with additional resources to empower our people to win in the market and deliver the highest-quality work. Together, Grant Thornton Advisors and CBIZ will be stronger than ever with greater reach and enhanced capabilities to serve a wide range of clients at every stage of growth." This perspective from New Mountain Capital highlights their confidence in the combined entity’s future prospects and its potential for market leadership.
Nikhil Devulapalli, also a Managing Director at New Mountain Capital, echoed this sentiment, adding, "Grant Thornton Advisors and CBIZ together have broad reach and impressive capabilities that are singular in the accounting and consulting space. Today, Grant Thornton Advisors is in a stronger position than ever to serve its clients and create meaningful opportunities for its partners and professionals." The emphasis on "singular capabilities" suggests a recognition of the unique market position the merged entity aims to occupy.
Strategic Divestitures and Future Growth Areas
The integration process involves several distinct components, including a separate attest transaction that is anticipated to finalize later this year. This transaction involves Grant Thornton LLP and CBIZ CPAs, CBIZ’s audit and attest services affiliate. Post-completion, CBIZ CPAs will operate as a distinct licensed public accounting firm during a transitional period before being fully integrated into Grant Thornton LLP.
In parallel with the accounting firm’s integration, CBIZ Benefits & Insurance Services has been launched as a standalone company, also backed by New Mountain Capital. This strategic move allows for a focused approach to the benefits and insurance sector. The newly independent entity boasts a workforce of over 1,600 professionals and has demonstrated robust growth, with its annual revenue increasing by nearly 40% since 2020, surpassing $400 million. This performance positions it as a significant player, expected to rank among the top 30 insurance brokers in the United States. The services offered by CBIZ Benefits & Insurance Services encompass a broad spectrum, including employee benefits consulting, human capital advisory solutions, property and casualty insurance, retirement and investment solutions, and individual insurance, catering to a diverse client base.
Michael Kouzelos, CEO of CBIZ Benefits & Insurance Services, conveyed his optimism about the company’s independent future: "This is a defining moment for our organization. We are launching an independent company with a strong foundation, a talented team, and a clear vision for the future," Kouzelos stated. He highlighted the company’s strategic positioning: "Our clients face increasingly complex decisions around benefits, risk, retirement, talent, and workforce strategy. As a standalone firm, we are uniquely positioned to expand our capabilities and enhance the support we provide to clients as they navigate those challenges. Backed by New Mountain Capital and powered by the dedication of our people, we are exceptionally well-positioned to drive growth, expand our capabilities, and continue building on the trust our clients place in us every day."

Polly Thomas, Chief Operating Officer at CBIZ Benefits & Insurance Services, reinforced the commitment to client relationships and service excellence: "For more than four decades, we’ve built lasting client relationships through exceptional service, personal attention, and a level of care that sets us apart in our industry. In this next chapter, our commitment to our clients will not change. We will continue to advise employers across benefits, payroll, retirement, and risk with innovative, tailored solutions designed to best serve and grow their business."
Timeline and Key Milestones
The journey to this significant acquisition began with the initial announcement in late July. This was preceded by Grant Thornton’s strategic decision in June 2024 to sell a majority stake to New Mountain Capital, setting the stage for further expansion and restructuring. The completion of the $5 billion acquisition of CBIZ on Monday marks the culmination of these efforts, with the integration of Grant Thornton Advisors and CBIZ commencing immediately under the unified Grant Thornton brand. The attest services integration is slated for completion later this year, while the spin-off and launch of CBIZ Benefits & Insurance Services as a standalone entity occurred concurrently with the main acquisition’s closing.
Market Implications and Industry Analysis
The $5 billion acquisition of CBIZ by Grant Thornton Advisors is a seismic event in the U.S. accounting industry. It represents a significant challenge to the established hierarchy, particularly the Big Four, by creating a formidable fifth player with substantial revenue and a broad service offering. This consolidation is likely to intensify competition, potentially leading to increased M&A activity among mid-tier firms seeking scale or niche specialization.
The strategic rationale of strengthening Grant Thornton’s multinational, cross-border platform is particularly pertinent in today’s globalized business environment. As companies increasingly operate across international borders, the demand for accounting and advisory services that can navigate complex regulatory frameworks, tax laws, and cultural nuances is on the rise. The combined entity’s expanded global footprint and diverse talent pool are well-positioned to capitalize on this trend.
Furthermore, the creation of a distinct, well-capitalized CBIZ Benefits & Insurance Services entity underscores a broader industry trend of specialization and targeted growth. By separating these operations, Grant Thornton can focus on its core accounting and advisory services, while CBIZ Benefits & Insurance Services can pursue its own strategic objectives within the insurance brokerage and employee benefits consulting market. This can lead to greater agility and responsiveness to market demands within each segment.

The involvement of New Mountain Capital, a private equity firm with a proven track record in the professional services sector, signifies a strategic financial backing that can fuel further growth and innovation. Their investment suggests a long-term vision for Grant Thornton Advisors, aiming to enhance its competitive positioning and market share.
Financial Advisory and Legal Counsel
The successful execution of such a large-scale transaction requires extensive financial and legal expertise. For CBIZ, Goldman Sachs & Co. LLC served as its financial advisor, while Weil, Gotshal & Manges LLP provided legal counsel. Teneo acted as the strategic communications advisor for CBIZ.
On the Grant Thornton Advisors and New Mountain Capital side, Deutsche Bank took the lead as financial advisor. A consortium of other prominent financial institutions provided additional advisory services, including J.P. Morgan, BMO Capital Markets, BofA Securities, RBC Capital Markets, UBS Investment Bank, and Jefferies. The complex legal aspects were managed by a team of legal advisors, including Simpson Thacher & Bartlett LLP, Mayer Brown LLP, and Hunton Andrews Kurth LLP. Evercore played a crucial role as a financial advisor specifically for the CBIZ Benefits & Insurance Services segment. Goldin Solutions provided strategic communications support. The comprehensive involvement of these firms highlights the intricate nature of the deal and the significant resources required for its successful completion.
The integration of CBIZ into Grant Thornton Advisors represents a pivotal moment, promising to reshape the competitive landscape of the U.S. accounting and advisory services market and set new benchmarks for service delivery and global reach.








