Pevita Pearce
The accounting profession is poised for a significant transformation following the announcement that Grant Thornton, a prominent private equity-backed firm, has entered into a definitive agreement to acquire CBIZ, another leading accounting services provider, for $5 billion. This monumental transaction, the largest merger and acquisition deal in the accounting profession in over 25 years, is set to elevate Grant Thornton’s standing in the U.S. accounting firm revenue rankings, placing it directly behind the esteemed "Big Four" firms. The deal also marks a pivotal moment as it involves CBIZ, the sole publicly traded accounting services provider in the United States. The news has ignited widespread discussion and analysis across the industry, focusing on the accelerating impact of private equity, the ongoing trend of firm consolidation, and the rapid evolution of the accounting landscape.
A Deal of Unprecedented Scale and Significance
The $5 billion acquisition of CBIZ by Grant Thornton is not merely a large transaction; it represents a seismic shift in the competitive dynamics of the U.S. accounting market. Grant Thornton, headquartered in Chicago, will, upon the deal’s completion, achieve a revenue surpassing $7.5 billion globally and over $5 billion domestically, positioning it as the fifth-largest professional services firm in the nation, trailing only Deloitte, PwC, EY, and KPMG. This move significantly bolsters Grant Thornton’s capacity to compete with the largest players in the industry, particularly in the middle market where both firms have historically held strong positions.
CBIZ, which recently acquired Marcum LLP in a $2.3 billion transaction in late 2024, had itself ascended to the seventh-largest accounting firm in the U.S., even surpassing Grant Thornton in the rankings at that time. The swiftness with which Grant Thornton has now acquired CBIZ underscores the aggressive pace of consolidation and the strategic maneuvering driven by private equity investment. The transaction is structured as an all-cash deal, with CBIZ shareholders set to receive $55 per share, reflecting a substantial premium of approximately 54% over the 30-day volume-weighted average trading price. This premium has already been reflected in CBIZ’s stock performance, with reports indicating a notable jump in pre-market trading following the announcement.
The Growing Influence of Private Equity in Accounting
The involvement of private equity in the accounting sector has been a growing trend, and this deal serves as a powerful testament to its accelerating influence. New Mountain Capital, a New York-based private equity firm managing approximately $60 billion in assets, previously acquired a majority stake in Grant Thornton’s U.S. arm in May 2024. This strategic investment, reportedly around 60% of the advisory and tax business, was widely understood to be a precursor to significant growth initiatives, including a substantial acquisition war chest. The acquisition of CBIZ appears to be the immediate realization of that strategy.
This playbook is not new to New Mountain Capital. The firm has a track record of executing similar growth strategies in the professional services sector. For instance, they took control of Citrin Cooperman in 2021, valuing it at $500 million. Under their stewardship, Citrin Cooperman grew to $850 million in revenue before being sold to Blackstone in January 2025 for approximately $2 billion. This precedent highlights the potential for significant value creation through strategic acquisitions and operational enhancements facilitated by private equity capital.
The acquisition of CBIZ is particularly noteworthy because CBIZ itself has a unique history. For nearly three decades, it stood as the sole publicly traded accounting firm in the United States. Its journey to becoming a major player in the middle market was partly shaped by strategic acquisitions, most recently the significant integration of Marcum’s advisory and tax business. The fact that this substantial, independently operating public entity is now agreeing to be acquired by a private equity-backed firm signals a fundamental shift in how accounting firms are financed and strategized for growth.
Industry Reactions and Expert Analysis
The magnitude of the Grant Thornton-CBIZ deal has naturally prompted a wide range of reactions and analyses from professionals within the accounting industry. Many view this as a watershed moment, emblematic of broader trends shaping the profession.
Allan Koltin, CEO of Koltin Consulting Group, highlighted the "unimaginable" nature of the deal, emphasizing that it represents a new paradigm for CPA firm transactions. He noted that while this specific transaction sees a public company becoming private, he still anticipates significant IPO activity within the accounting space in the coming years, potentially including the Big Four firms. Koltin also pointed out the strategic rationale behind the merger, suggesting that both Grant Thornton and CBIZ, despite operating in different "weight classes," were targeting the same market segments. He articulated the critical capital needs for investments in "Technology (AI); Talent; Transformation (Industry and Service Line Specialization depth); and Territory (Geographic expansion)," suggesting that combining forces makes strategic sense for accelerated growth.
Ben Christopher, Senior Manager of M&A at West Monroe, posited that artificial intelligence is increasingly making accounting firms attractive investment opportunities. He observed that some firm owners are motivated to sell due to the significant investments required for AI adoption, while private equity firms possess the capital and inclination to modernize these businesses, thereby fueling M&A activity. Christopher characterized accounting as offering "the best of both worlds for private equity: dependable cash flow today and meaningful upside tomorrow." He also cited examples like EisnerAmper and Cherry Bekaert, which have rapidly scaled under private equity ownership through numerous acquisitions, as evidence of the successful private equity playbook in action.
Gary Lu, CPA and CFO of ConsumerDirect, echoed the sentiment that the accounting industry is changing at a rapid pace. He provided a clear timeline of recent significant events, including CBIZ’s acquisition of Marcum LLP and now Grant Thornton’s $5 billion acquisition of CBIZ, illustrating the dynamic consolidation occurring. Lu emphasized that this is fundamentally a private equity story, with New Mountain Capital’s investment in Grant Thornton clearly aimed at building larger platforms through strategic acquisitions. He noted that as CFOs, the evolving nature of advisory firms impacts their organizations, with increasing expectations for professional services firms to invest in AI, data, and specialized expertise.
Ron Abraham, CPA and Partner at KSDT CPA, succinctly captured the shockwaves sent through the industry, stating, "$5 Billion. Grant Thornton just rattled the accounting industry." He underscored the historical significance of CBIZ as the only publicly traded accounting firm for nearly three decades and highlighted how this transaction propels the combined entity into the fifth-largest professional services firm in the U.S., solidifying its position outside the Big Four.
Jack Castonguay, PhD, CPA, Associate Professor of Accounting at Hofstra University, predicted an acceleration of mergers and private equity investments in the short term. He suggested that this trend will place downward pressure on the traditional partnership and hourly billing models. Castonguay also noted that the combined firm’s revenue has doubled overnight, bringing it closer to being able to compete with the smaller Big Four firms.
Adam Tahir, CPA and Founder and CEO of Bizora, provided a detailed financial breakdown of the deal, highlighting the premium paid to CBIZ shareholders and the role of New Mountain Capital. He drew parallels to New Mountain’s successful prior investment in Citrin Cooperman, underscoring the firm’s established strategy for value creation in the accounting sector. Tahir also pointed out the unique aspect of CBIZ’s transition from a publicly traded entity to an acquisition target, noting that it was the "largest independent consolidator in middle market accounting."
Vishant Mehta, CPA and Co-Founder of Valim, reflected on how such a deal would have been "unthinkable" twenty-five years ago. He described the traditional landscape of the Big Four at the top and others below, stating that this picture is "starting to crack." Mehta sees this consolidation as the beginning, not the end, of a significant reshaping of the professional services industry.
Broader Implications and the Future of Accounting
The Grant Thornton-CBIZ deal carries profound implications for the accounting profession, clients, and the future of professional services.
Industry Consolidation and Competition: The transaction significantly accelerates the consolidation trend within the accounting industry, particularly in the middle market. By creating a larger, more robust entity, Grant Thornton is better positioned to compete for larger clients and more complex engagements, potentially challenging the dominance of the Big Four in certain segments. This consolidation also means fewer independent firms of significant scale, potentially altering client choice and market dynamics.
The Rise of AI and Technological Transformation: Several commentators emphasized the critical role of technology, especially artificial intelligence (AI), in driving this consolidation. The substantial capital infusion from private equity provides the necessary resources for firms like Grant Thornton to invest heavily in AI and other advanced technologies. This investment is crucial for automating compliance tasks, enhancing data analytics, and developing new value-added services. The future of accounting is increasingly seen as one where AI handles routine tasks, freeing up accountants to focus on strategic advisory roles.
Shifting Client Expectations: As accounting firms evolve and adopt new technologies, client expectations are also changing. Businesses are increasingly looking to their accounting advisors not just for compliance but for strategic insights, proactive advice, and access to cutting-edge solutions. Firms that can effectively leverage technology and offer specialized expertise will likely gain a competitive edge.
The Evolving Role of Accountants: The traditional role of an accountant is undergoing a significant metamorphosis. The advent of AI means that the "making of the sausage" – the core compliance work – will be largely automated. This necessitates a shift in skills and focus, moving from transactional processing to higher-level advisory services. Accountants will need to become "most valuable advisors" rather than just "most trusted advisors," possessing skills in data interpretation, strategic planning, and client relationship management.
Private Equity’s Strategic Vision: The involvement of private equity firms like New Mountain Capital signals a long-term strategy to build scale, drive efficiency through technology, and create significant value through strategic acquisitions. Their investment is not just about acquiring firms but about fundamentally reshaping them to be more competitive and profitable in a rapidly changing market. This approach is likely to continue to drive further M&A activity as firms seek to adapt or are acquired by larger, well-capitalized entities.
The Grant Thornton-CBIZ deal is a landmark event that underscores the dynamic and rapidly evolving nature of the accounting profession. It is a clear indicator that scale, technological innovation, and strategic financial backing will be paramount for success in the years to come, setting the stage for continued transformation and competition.
