Grant Thornton has agreed to acquire CBIZ in an all-cash transaction valued at $5 billion, backed by its private equity investor New Mountain Capital. CBIZ shareholders receive $55 per share — a 54% premium to the 30-day volume-weighted average price. The deal is expected to close in the fourth quarter of 2026, subject to a "go-shop" provision that ran through August 27 allowing CBIZ's board to entertain superior offers.
What the combined firm looks like
Grant Thornton currently ranks No. 9 with roughly $2.5 billion in revenue. CBIZ ranks No. 8 with about $2.8 billion. Together they would rank fifth in the United States:
- More than $5 billion in domestic revenue
- Roughly $7.5 billion in global revenue
- More than 34,500 employees
Grant Thornton Advisors becomes the sole owner of CBIZ's core operations. CBIZ's benefits and insurance segment is being separated into an independent company, also backed by New Mountain Capital.
What leadership said
Jim Peko, CEO of Grant Thornton Advisors, framed the transaction around combining "our multinational platform with CBIZ's strong market presence" to serve clients through every stage of growth. Jerry Grisko, CBIZ's president and CEO, called it a "historic combination."
Why this one matters more than the deal size suggests
Plenty of accounting firm transactions are add-ons — a Top 50 firm absorbing a four-partner practice in a new metro. This is not that. A $5 billion all-cash acquisition of a publicly traded competitor, financed by institutional capital, changes what the middle of the market looks like. When the No. 8 and No. 9 firms combine, every firm below them is competing against a materially larger balance sheet for the same clients and the same staff.
It also confirms the direction of travel. Outside capital is no longer an experiment at the edges of the profession — it is now the mechanism by which the largest non-Big-Four firms are being assembled.
What it means for independent firms
The firms most affected by a deal this size are not the ones being acquired. They are the independent 5-to-50-person practices who will now find that:
- Recruiting competes against a national compensation budget
- Mid-market clients get courted by a firm with a genuine national footprint
- Technology investment at the top end accelerates, widening the capability gap
None of that requires an independent firm to sell. It does require an answer to the capacity question, because the firms with capital are buying capacity outright.
For firms that intend to stay independent, the practical response is to acquire capacity without acquiring a balance sheet: automate the mechanical parts of return preparation, and build a trained bench that scales with the season rather than with the payroll. That is precisely the gap GTPH's AI-enabled preparation platform and Centers of Excellence are built to close — technical accuracy and reviewable output, at fixed fees, without a merger.
Consolidation at the top does not have to mean a ceiling at the bottom. It does mean the status quo is no longer a strategy.
