A $400 million-plus insurance and employee benefits operation is being carved out of CBIZ and set up as a standalone company - the consequence of a $5 billion all-cash deal announced Wednesday in which Grant Thornton Advisors acquires CBIZ in the accounting sector's largest consolidation since the Big Four were formed, according to the Financial Times, which first reported the transaction.
CBIZ's Benefits and Insurance Services segment - spanning group health benefits consulting and brokerage, property and casualty insurance, retirement plan advisory, and payroll and human capital management - will be separated into an independent company backed by New Mountain Capital after the deal closes, currently targeted for Q4 2026 subject to CBIZ shareholder approval and regulatory clearance. New Mountain, which led the May 2024 investment in Grant Thornton Advisors that triggered the firm's acquisition spree, is making an incremental equity investment to support the transaction and will back the new insurance and benefits entity as a standalone business.
The segment being spun out is a substantial mid-market operation with a well-established national footprint. CBIZ Benefits and Insurance Services generated $401 million in revenue in full-year 2024, according to CBIZ's segment reporting, and posted Q2 2026 revenue of $101.9 million - flat year on year, according to CBIZ's Q2 2026 earnings release. It serves primarily small and medium-sized businesses across the US, delivering group health benefits consulting and brokerage, property and casualty insurance, retirement plan advisory and investment services, and payroll and human capital management.
The segment's client base overlaps substantially with CBIZ's broader professional services clientele - middle market companies that have historically received accounting, tax, benefits, and insurance services through an integrated relationship with one firm. The separation will sever that integration for the insurance and benefits book, creating a standalone entity that will need to maintain those client relationships on its own terms, without the accounting relationship as an anchor.
The decision to spin the segment out rather than sell it or fold it into Grant Thornton reflects a structural logic specific to the audit profession. Grant Thornton is primarily an audit and advisory firm, and the independence rules that govern audit practice create conflicts with operating an insurance brokerage within the same entity. Separating the benefits and insurance book removes that conflict cleanly while allowing New Mountain to retain exposure to a business that has grown its revenue from $298 million in 2020 to $401 million in 2024 - a 35% increase over four years, according to CBIZ's historical segment data.
The new standalone entity will operate in a market undergoing significant consolidation of its own. Mid-market employee benefits brokers and P&C shops serving the same SME client base as CBIZ have been acquisition targets for national brokers, private equity-backed consolidators, and regional firms throughout the current cycle. A New Mountain-backed independent with $400 million in revenue and an established national presence enters that landscape as both a potential acquirer and a potential target.
The wider deal creates the fifth-largest professional services, tax and advisory provider in the US, with more than $5 billion in annual domestic revenue and close to $7.5 billion globally across more than 20 countries and 34,500 professionals, according to the joint announcement. CBIZ shareholders will receive $55 per share in cash - a 54% premium to the 30-day volume-weighted average share price and an 18% premium to Tuesday's closing price, though well below the $88.65 the stock touched early last year before Marcum integration difficulties weighed on earnings, according to the Financial Times.
The CBIZ board unanimously approved the transaction and is recommending shareholders vote in favor. A go-shop period runs through August 27, 2026 - a window during which CBIZ may solicit competing bids - after which standard no-shop provisions apply. The deal is the largest accounting firm combination since the 1998 merger of Price Waterhouse with Coopers & Lybrand, according to the Financial Times.
Grant Thornton chief executive Jim Peko told the Financial Times that Grant Thornton had no ambition 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. It's great to be number five, but we're also not focused on league tables."
For the insurance and benefits professionals within CBIZ, the more consequential question is what independence looks like under New Mountain's ownership. New Mountain is a private equity firm; its investment in Grant Thornton Advisors dates to May 2024, and its backing of the new standalone entity will follow a similar logic. For a PE-backed business of this scale and profile, an eventual exit - whether through a strategic sale to a national broker, a secondary buyout, or a public listing - is the structurally most likely destination. The timeline and form of that exit will depend on how quickly the new entity establishes itself as a standalone platform. For the mid-market insurance and benefits market, the answer will matter.
