Grant Thornton seals $5 billion CBIZ accounting takeover

Grant Thornton Advisors has agreed to buy CBIZ in a $5 billion all-cash deal that would make Grant Thornton the fifth-largest U.S. professional services, tax and advisory provider. Shareholders of CBIZ would receive $55.00 per share, a premium of about 54% to the stock’s 30-day volume-weighted average price, with closing targeted for the fourth quarter of 2026.

The agreement, announced Wednesday, is being billed as the accounting sector’s largest takeover in more than 25 years — a generation-scale shake-up just outside the Big Four of Deloitte, EY, KPMG and PwC. For investors tracking professional-services consolidation, the all-cash structure and clear premium are the first numbers that matter.

Key Takeaways

• Grant Thornton Advisors will acquire CBIZ in an all-cash transaction with a $5 billion enterprise value.
• CBIZ shareholders are set to receive $55.00 per share, about a 54% premium to the 30-day volume-weighted average price and a 17.8% premium to the prior close.
• After closing, Grant Thornton is expected to rank fifth in U.S. professional, tax and advisory services, with more than $5 billion in annual domestic revenue.
• New Mountain Capital is adding equity support; CBIZ’s Benefits and Insurance Services unit is slated to become a separate company after closing.
• A go-shop period runs through August 27, 2026, while law firm Halper Sadeh LLC is investigating whether CBIZ is obtaining a fair price for shareholders.

According to Reuters, CBIZ shares jumped about 17.5% in premarket trading after the terms were disclosed. That move underlines how quickly public markets priced the cash exit offered to CBIZ holders.

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Why does the Grant Thornton–CBIZ deal matter for investors?

Scale is the strategic pitch. Upon closing, Grant Thornton in the U.S. is expected to become the fifth-largest provider of professional services, tax and advisory services, with more than $5 billion in annual domestic revenue. The companies said the combined multinational platform would span more than 20 countries and territories and generate nearly $7.5 billion in revenue.

Grant Thornton Advisors CEO Jim Peko framed the combination as a way to support clients “through every stage of growth — from early development to global scale.” Private equity firm New Mountain Capital, which led a May 2024 investment in Grant Thornton Advisors, is making a new equity investment to support the CBIZ purchase.

That private-capital backing matters for conversations about deal support, even though closing still requires shareholder and regulatory green lights. For passive investors and CBIZ holders, the near-term story is less about brand slogans and more about cash consideration versus remaining completion risk.

How much will CBIZ shareholders get, and is the price being challenged?

Under the definitive agreement, CBIZ shareholders will receive $55.00 in cash for each share of common stock. The companies said that equals an approximate 54% premium to CBIZ’s 30-day volume-weighted average share price. Reuters reported the offer also equates to a 17.8% premium to the stock’s previous close.

CBIZ’s board unanimously approved the transaction and recommends that shareholders vote in favor. Upon completion, CBIZ would become wholly owned by Grant Thornton Advisors, and CBIZ common stock would cease trading and leave the New York Stock Exchange.

Not everyone is treating the headline price as the final word. Investor-rights firm Halper Sadeh LLC said it is investigating whether CBIZ, Inc. is obtaining a fair price for its shareholders — a common post-announcement review that can seek higher consideration or added disclosures, but does not by itself block a deal.

CBIZ also has a contractual window to test the market. The merger agreement permits a “go-shop” period through August 27, 2026, during which CBIZ can solicit alternative proposals. There is no assurance a superior bid will emerge.

What happens to the businesses after Grant Thornton closes the takeover?

After the deal closes, Grant Thornton Advisors plans to separate CBIZ’s Benefits and Insurance Services segment into an independent company backed by New Mountain Capital. The core professional-services combination is meant to deepen U.S. market presence while tying into Grant Thornton Advisors’ multinational platform.

CBIZ President and CEO Jerry Grisko called the combination a historic cultural and strategic fit that would accelerate CBIZ’s growth vision while delivering significant value to shareholders. Advisers on the deal include Goldman Sachs for CBIZ and Deutsche Bank as lead financial adviser for Grant Thornton Advisors.

When could the Grant Thornton deal close, and what could still go wrong?

The companies expect the transaction to close in the fourth quarter of 2026, subject to CBIZ shareholder approval, required regulatory approvals and other customary conditions. Until then, CBIZ remains a publicly traded stock whose price can swing with sentiment about closing odds, competing bids during the go-shop, or any legal scrutiny over deal terms.

For wealth-focused readers, the practical checklist is straightforward: watch the shareholder vote, track whether a higher bid appears before late August, and monitor regulatory clearance. The cash multiple is locked in the merger agreement at $55.00 per share if and when the deal completes — not before.

Bottom line: Grant Thornton’s $5 billion cash bid for CBIZ is the biggest accounting-sector takeover of its kind in more than a generation, and it would vault the buyer into clear No. 5 territory behind the Big Four. Investors now wait on the go-shop, the vote and regulators to see whether that headline becomes a closed deal.