Summary
Global insurance broker Aon has agreed to acquire USI Insurance Services from private equity firm KKR in an all-cash deal worth roughly $17 billion. The transaction marks one of the largest private equity exits in the insurance sector and significantly expands Aon’s reach into the US middle-market segment.
A Landmark Deal in Insurance Brokerage
Global insurance and consulting giant Aon has agreed to acquire USI Insurance Services from private equity firm KKR and other shareholders in an all-cash transaction valued at approximately $17 billion. The deal, confirmed Monday after days of speculation following a weekend report from The Wall Street Journal, ranks among the largest transactions in the insurance brokerage industry this year and represents a major private equity exit for KKR.
USI, headquartered in Valhalla, New York, is the tenth-largest insurance broker in the United States, generating roughly $3 billion in annual revenue and employing more than 10,500 people across nearly 200 offices nationwide. The firm specializes in property and casualty insurance, employee benefits, personal risk management, and retirement consulting for mid-sized businesses — precisely the segment Aon has been aggressively targeting in recent years.
Building on the NFP Playbook
The USI acquisition follows a similar strategic move by Aon two years earlier, when it acquired middle-market insurance broker NFP for $13 billion. Combined, the two deals signal a clear and deliberate strategy: rather than competing primarily for the largest multinational corporate clients, Aon is building out a dedicated platform to serve mid-sized businesses at scale, a segment executives believe offers substantial room for growth.
Aon’s chief executive framed the acquisition as a step toward establishing what he called the premier US middle-market platform, one designed to deepen the company’s competitive advantage and accelerate organic growth. USI’s chairman and chief executive, Mike Sicard, will take on an expanded role at Aon following the deal’s close, serving as president of Aon and global chief executive of its middle-market segment, reporting directly to Aon’s top leadership.
The Numbers Behind the Deal
Aon expects to fund the acquisition entirely through new debt issued across a range of maturities, while maintaining its investment-grade credit rating. The company has signaled it does not plan to repurchase shares in the near term, prioritizing debt repayment instead. Aon projects the deal will boost adjusted earnings per share starting in 2028 and expects to generate approximately $395 million in annual run-rate net adjusted earnings from combined revenue and cost synergies once the integration is complete.
For KKR, the sale represents a significant and highly profitable exit. The firm first invested in USI in 2017 alongside Canadian pension fund Caisse de dépôt et placement du Québec, paying roughly 1 billion in additional capital to become USI’s largest shareholder. At the agreed sale price, KKR expects to realize approximately $3.3 billion in after-tax proceeds — a return several multiples above its original investment. Under KKR’s ownership, USI nearly tripled its revenue and completed more than 90 bolt-on acquisitions, substantially expanding its footprint and service offerings.
Part of a Broader Wave of Private Equity Exits
The USI sale continues a run of successful exits for KKR, which reported a record $1.29 billion in asset sales during its most recent quarter. Other recent divestitures include its data-center cooling business and the commercial and defense aerospace unit of a specialty pump manufacturer. Analysts note that after several years of subdued dealmaking, private equity firms have found increasingly favorable conditions to sell mature portfolio companies to strategic buyers, and the USI transaction stands as one of the sector’s clearest examples so far this year.
The deal also bucks a broader trend in insurance brokerage M&A, where private equity firms have more often been buyers of agencies and consultancies rather than sellers to large strategic players. That makes the transaction notable not just for its size, but for what it may signal about shifting dynamics in an industry that has consolidated rapidly over the past decade.
What Happens Next
The transaction remains subject to regulatory approval and is expected to close in the fourth quarter of 2026. Once completed, it will meaningfully expand Aon’s presence in the excess-and-surplus insurance market through USI’s wholesale capabilities, while giving the combined company access to an expanded base of roughly 200,000 middle-market clients across the United States.
Industry observers will be watching closely to see whether the deal accelerates further consolidation among mid-sized insurance brokers, as competitors weigh how to respond to Aon’s rapidly expanding middle-market footprint. For now, the acquisition cements Aon’s position as one of the most aggressive consolidators in an insurance brokerage sector that shows little sign of slowing its pace of dealmaking.
