Grant Thornton Advisors agreed to acquire CBIZ, Inc. on July 29, 2026, in an all-cash transaction with an enterprise value of $5 billion. The deal creates the fifth-largest professional services provider in the United States and marks the largest transaction of its kind in the accounting industry in more than 25 years. The combination brings together two firms with a long history of parallel growth, positioning the merged entity to compete more directly with the Big Four and other top-tier advisory firms.
- What Is the Grant Thornton CBIZ Deal?
- Who Are the Parties Involved in the Transaction?
- What Are the Financial Terms of the Deal?
- Why Is Grant Thornton Acquiring CBIZ?
- What Is the Historical Background Behind the Deal?
- What Happens to CBIZ’s Benefits and Insurance Segment?
- What Regulatory and Approval Steps Remain?
- What Employee Protections Are Included in the Agreement?
- How Does This Deal Compare to Other Accounting Industry Mergers?
- What Are the Benefits of the Grant Thornton CBIZ Deal?
- What Are the Risks and Challenges of the Deal?
- What Is the Outlook for the Combined Firm After Closing?
What Is the Grant Thornton CBIZ Deal?
Grant Thornton Advisors will acquire CBIZ, Inc. for $5 billion in an all-cash deal, paying $55 per share, creating a combined firm with $7.5 billion in global revenue and more than 34,500 employees across 20-plus countries.
The agreement was announced on July 29, 2026, by Grant Thornton Advisors LLC, New Mountain Capital, and CBIZ, Inc. Under the terms, CBIZ will become a wholly owned subsidiary of Grant Thornton Advisors, and CBIZ common stock, currently traded on the New York Stock Exchange under the ticker CBZ, will cease public trading once the transaction closes. Grant Thornton is a Chicago-based professional services firm offering audit, tax, and advisory services. CBIZ is a Cleveland-based provider of accounting, tax, advisory, benefits, and insurance services to middle-market businesses. The two firms operate in overlapping segments of the U.S. professional services market, primarily serving small and mid-sized companies rather than large multinational corporations.
Who Are the Parties Involved in the Transaction?
Grant Thornton Advisors is the acquiring firm; CBIZ, Inc. is the target company; New Mountain Capital is the private equity investor financing the deal; Deutsche Bank and Goldman Sachs serve as financial advisors to Grant Thornton and CBIZ, respectively.
Grant Thornton Advisors reported fiscal year 2025 net revenue of $2.46 billion, according to Inside Public Accounting rankings. CBIZ reported FY25 net revenue of $2.81 billion. New Mountain Capital, a private equity firm, first invested in Grant Thornton Advisors in May 2024, providing what the firm described as a significant growth investment. New Mountain is now committing $5.2 billion in financing to support the CBIZ acquisition and will also back the spinoff of a CBIZ business unit into a separate company. Jim Peko serves as CEO of Grant Thornton Advisors. Jerry Grisko serves as President and CEO of CBIZ. The CBIZ board of directors unanimously approved the transaction and has recommended that shareholders vote in favor of it.
What Are the Financial Terms of the Deal?
CBIZ shareholders will receive $55 per share in cash, representing a 54% premium over the 30-day volume-weighted average share price and a 17.8% premium over CBIZ’s most recent closing price before the announcement.
The transaction carries an enterprise value of $5 billion. This figure includes both the equity value paid to shareholders and CBIZ’s outstanding debt assumed in the acquisition. The all-cash structure differs from CBIZ’s own 2024 acquisition of Marcum LLP, which was a cash-and-stock transaction valued at approximately $2.3 billion. Paying entirely in cash removes dilution concerns for existing Grant Thornton stakeholders and gives CBIZ shareholders certainty of value rather than exposure to a combined company’s future stock performance. The premium size reflects the strategic value Grant Thornton places on CBIZ’s client base, geographic footprint, and service lines, particularly in the middle-market segment where both firms compete.
Why Is Grant Thornton Acquiring CBIZ?
Grant Thornton is acquiring CBIZ to expand its multinational platform, add scale in the U.S. middle market, accelerate AI-enabled service delivery, and move up the ranking of largest U.S. professional services firms from outside the top ten to fifth place.
Jim Peko stated that combining Grant Thornton’s multinational platform with CBIZ’s market presence broadens the firm’s ability to support businesses through every stage of growth. The professional services industry has undergone rapid consolidation since 2023, driven by private equity capital entering accounting firms, rising client demand for integrated tax, audit, advisory, and technology services, and competitive pressure to invest in artificial intelligence tools. Grant Thornton’s acquisition follows CBIZ’s own aggressive growth strategy, which included its $2.3 billion purchase of Marcum LLP in 2024. By acquiring CBIZ, Grant Thornton absorbs a firm that had itself just completed one of the largest accounting mergers in industry history, giving Grant Thornton immediate access to Marcum’s former client relationships and personnel.
What Is the Historical Background Behind the Deal?
CBIZ built its scale through decades of acquisitions, including a 2024 purchase of Marcum LLP for $2.3 billion; Grant Thornton received a major private equity investment from New Mountain Capital in May 2024 that fueled its current growth strategy.
CBIZ has operated for 37 years and has historically grown through acquisition rather than organic expansion alone. Its most significant prior deal was the 2024 acquisition of Marcum’s non-attest business, which at the time was described as the largest transaction in CBIZ’s history. That deal made CBIZ the seventh-largest accounting firm in the United States, with combined annualized revenue of approximately $2.8 billion and more than 10,000 employees. As part of the Marcum transaction, Marcum’s attest, or audit, business was separately acquired by CBIZ CPAs, formerly known as Mayer Hoffman McCann P.C., an independent CPA firm that has maintained an administrative service agreement with CBIZ since 1998. This structure, known as an alternative practice structure, separates attest work performed by independent CPA firms from non-attest advisory work performed by publicly traded companies like CBIZ, a distinction required because SEC and PCAOB independence rules restrict public company ownership of firms that conduct audits. Grant Thornton, meanwhile, took its own step toward private equity ownership in May 2024, when New Mountain Capital made a significant growth investment in the firm. That capital infusion set the stage for Grant Thornton’s current acquisition of CBIZ just over two years later.
What Happens to CBIZ’s Benefits and Insurance Segment?
Following the deal’s close, Grant Thornton Advisors plans to separate CBIZ’s Benefits and Insurance Services segment into a standalone, independently operated company backed by New Mountain Capital, rather than integrating it into the combined professional services firm.
This carve-out signals that Grant Thornton’s strategic priority is CBIZ’s accounting, tax, and advisory operations rather than its insurance brokerage and employee benefits consulting business. Benefits and insurance services require different regulatory licensing, sales infrastructure, and client relationships than tax and audit work, making the segment a less natural fit within a combined accounting and advisory platform. New Mountain Capital’s continued backing of this spinoff suggests the private equity firm sees standalone growth potential in the benefits and insurance unit, separate from the professional services combination. The structure also allows Grant Thornton to focus post-merger integration efforts on core accounting and advisory service lines without absorbing an unrelated insurance business.
What Regulatory and Approval Steps Remain?
The deal requires CBIZ shareholder approval, customary regulatory clearances, and is subject to a go-shop period through August 27, 2026, during which CBIZ may solicit competing acquisition offers.
The go-shop provision is a standard feature in public company mergers that allows the target’s board to test whether a higher offer exists in the market before shareholders vote on the announced deal. During this period, CBIZ, advised by Goldman Sachs, may actively solicit alternative proposals from other potential acquirers. Grant Thornton is advised by Deutsche Bank on the financial aspects of the transaction. If no superior offer emerges by August 27, 2026, the original agreement proceeds toward a shareholder vote and regulatory review. Regulatory clearance for a deal of this size typically involves antitrust review, given the combined firm’s scale in the professional services market, though accounting and advisory mergers generally face less antitrust scrutiny than mergers in more concentrated industries. The transaction is expected to close in the fourth quarter of 2026.
What Employee Protections Are Included in the Agreement?
The merger agreement includes employee protection measures alongside the go-shop provision, addressing workforce continuity concerns for CBIZ’s more than 10,000 team members during the integration process.
Large accounting firm mergers frequently raise questions about redundant positions, office consolidation, and cultural integration. CBIZ’s 2024 acquisition of Marcum, for example, prompted organizational adjustments including a rebranding of Mayer Hoffman McCann to CBIZ CPAs and changes to supervisory structures. Jerry Grisko described the Grant Thornton deal as a combination with complementary cultural and strategic fit, language commonly used by executives to reassure employees and clients that operational disruption will be limited. Given that CBIZ itself only completed integration of the Marcum acquisition within the past two years, the company’s workforce faces a second major organizational transition in a short period. Employee protection measures in the merger agreement are designed to provide some contractual assurance during this transition, though specific details of these protections were not disclosed in the initial announcement.
How Does This Deal Compare to Other Accounting Industry Mergers?
The Grant Thornton-CBIZ deal is the largest accounting industry transaction in more than 25 years, exceeding CBIZ’s own $2.3 billion Marcum acquisition and reflecting an industry-wide wave of private equity-backed consolidation among top 25 U.S. accounting firms.
| Transaction | Year Announced | Deal Value | Resulting Firm Size Rank |
|---|---|---|---|
| CBIZ acquires Marcum | 2024 | $2.3 billion | 7th-largest U.S. accounting firm |
| Grant Thornton acquires CBIZ | 2026 | $5 billion (enterprise value) | 5th-largest U.S. professional services firm |
Private equity firms have increasingly targeted accounting and professional services firms since 2023, attracted by stable, recurring revenue from tax compliance and advisory work. New Mountain Capital’s involvement in both Grant Thornton’s growth investment and its financing of the CBIZ acquisition illustrates this pattern. Francine McKenna, an adjunct professor at Montclair State University who writes an accounting industry newsletter, characterized the broader trend as one where consolidation has become the dominant strategy among mid-tier firms seeking to compete with the Big Four audit firms: Deloitte, PwC, EY, and KPMG. The alternative practice structure model, used by both CBIZ and Grant Thornton to separate audit work from advisory ownership, has become increasingly common across the industry as private equity capital flows into public accounting.
What Are the Benefits of the Grant Thornton CBIZ Deal?
Key benefits include expanded geographic reach across 20-plus countries, combined revenue of $7.5 billion, a workforce of more than 34,500 professionals, accelerated investment in AI-enabled service delivery, and stronger competitive positioning against larger rivals.
Three primary benefits emerge from the transaction. First, scale: the combined firm becomes the fifth-largest professional services provider in the United States, with more than $5 billion in annual domestic revenue, moving Grant Thornton into closer competition with firms like RSM US and BDO USA. Second, service breadth: CBIZ contributes deep expertise in accounting, tax, benefits, and technology consulting for middle-market clients, complementing Grant Thornton’s existing multinational advisory platform. Third, capital efficiency: because the transaction is entirely cash-funded through New Mountain Capital’s committed financing, Grant Thornton avoids issuing new equity, preserving ownership concentration among existing stakeholders while still funding a transformative acquisition.
What Are the Risks and Challenges of the Deal?
Primary risks include integration complexity following CBIZ’s recent Marcum merger, potential loss of client and staff continuity, regulatory delay, and the possibility of a competing bid emerging during the go-shop period through August 27, 2026.
Three specific risk categories apply. First, integration fatigue: CBIZ completed its own major acquisition of Marcum in November 2024, and undergoing a second large-scale integration within roughly two years increases the risk of client attrition and employee turnover. Second, cultural and operational alignment: combining two firms with different service models, technology systems, and client relationship approaches requires significant management attention, and past accounting mergers have shown that supervisory and quality-control adjustments, such as those CBIZ made after acquiring Marcum, take time to implement. Third, deal certainty: the go-shop provision means the announced terms are not final until the solicitation period closes on August 27, 2026, and shareholder and regulatory approvals remain pending, meaning the transaction could still be modified or challenged before it closes in the fourth quarter of 2026.
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What Is the Outlook for the Combined Firm After Closing?
Upon closing in the fourth quarter of 2026, the combined Grant Thornton-CBIZ entity is expected to operate as the fifth-largest U.S. professional services provider, with continued private equity backing from New Mountain Capital supporting further growth and AI-enabled service expansion.
The transaction reflects a structural shift in how large accounting and advisory firms are financed and scaled. Private equity ownership, once uncommon in public accounting due to independence rules governing audit work, has become a defining feature of the industry’s largest recent transactions. Grant Thornton’s move to acquire CBIZ, following its own 2024 capital infusion from New Mountain, indicates that private equity-backed consolidation will likely continue shaping the competitive landscape among firms ranked outside the traditional Big Four. For clients of both firms, the practical outlook includes expanded service offerings across accounting, tax, advisory, benefits, and technology consulting, delivered through a larger multinational platform. For the broader industry, the deal sets a new benchmark for transaction size among non-Big Four accounting and advisory firms and may prompt further consolidation moves among remaining mid-tier competitors seeking to match the scale of the combined Grant Thornton-CBIZ organization.
