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Western Hemisphere

Aon Buys USI for US$17 Billion to Take On the US Middle Market

The Editor

The Editor

— 4 min read
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Aon CEO Greg Case
Aon CEO Greg Case

Aon plc agreed on August 31, 2026, to acquire USI Insurance Services from KKR and its co-investors for US$17 billion in cash, in what becomes the largest insurance brokerage transaction of the year. USI, based in Valhalla, New York, is the tenth-largest insurance broker in the United States, with roughly US$3 billion in annual revenue, more than 10,500 employees and close to 200 offices. It sells property and casualty coverage, employee benefits, retirement products and personal risk services, mostly to midsize companies. The deal is expected to close in the fourth quarter of 2026, subject to regulatory approvals, and Aon plans to fund it entirely with new debt.

Aon, led by CEO Greg Case, valued the business at about 14.5 times synergized trailing adjusted EBITDA and expects roughly US$395 million in annual run-rate savings once the two organizations are fully integrated. USI Chairman and CEO Mike Sicard will become president of Aon plc and global CEO of its middle-market division, joining the company's executive committee. For KKR, which first invested in USI in 2017 at a valuation of about US$4.3 billion, the sale delivers roughly US$3.3 billion in expected after-tax proceeds, a 6.0x multiple on its 2017 equity and 3.4x on total capital invested. KKR is led by co-CEOs Joe Bae and Scott Nuttall, with partner Chris Harrington overseeing the USI investment.

Market Context

The transaction is the clearest sign yet that brokerage consolidation has moved up-market. Aon bought NFP for about US$13.4 billion in December 2023 at roughly 15 times EBITDA, targeting the same midsize corporate client base. Adding USI gives Aon a second large platform aimed at a US middle market the company sizes at more than US$40 billion in commissions and fees, or over a third of all US commercial property and casualty premium. That is the segment where organic growth has been strongest and where Marsh McLennan, Arthur J. Gallagher and Brown & Brown have been buying regional agencies at a steady clip for the better part of a decade.

The timing also says something about private equity. After a long stretch of muted exit activity, a reopened M&A market is letting buyout firms clear aging positions and return cash to their own investors. USI had been in KKR's portfolio for nine years, well past the typical hold period, and the exit lands as distributions have become the metric limited partners scrutinize most. Financing the purchase entirely with debt, meanwhile, puts Aon's leverage back under the microscope less than three years after the NFP deal stretched its balance sheet.

What Stands Out

"USI is a textbook case of partnership, patience and value creation that delivered an exceptional outcome for our shareholders and clients." — Joe Bae and Scott Nuttall, Co-CEOs, KKR

Regional Relevance

For the United States, the deal reshapes who insures the country's midsize employers. Companies in that band, too large for a local agency and too small for the bespoke attention the largest brokers give the Fortune 100, account for a disproportionate share of private-sector jobs, and their brokers effectively decide how they buy health benefits, cyber coverage and liability protection. Concentrating that advisory layer inside two or three global firms raises real questions about pricing and choice, and it is likely to attract attention from antitrust reviewers before the deal closes. Aon's pitch is that scale brings better data: the argument is that a broker with visibility into thousands of midsize risk profiles can price and place coverage more accurately than a regional shop can.

The deal also lands in a market where commercial insurance buyers have been squeezed by catastrophe losses, rising reinsurance costs and property rates that only recently began to soften. A broker with more negotiating weight can be an asset to clients in that environment, but the same scale gives Aon more leverage over the carriers it places business with, which reshuffles power across the whole distribution chain.

For the private markets, the sale is a marker of what a well-timed sponsor exit now looks like. KKR turned a 2017 platform investment into US$3.3 billion of after-tax proceeds and about US$2.00 per share of adjusted net income, a result that will be cited across the industry as evidence that patient, operationally intensive holds still work. It also confirms that strategic buyers, not other sponsors, are again willing to pay full multiples for scaled assets, which is the condition the exit backlog has been waiting on.

The Other Side

Can Aon absorb USI while it is still digesting NFP? Aon closed the NFP acquisition in 2024 and has not finished folding that business in. Layering a second, larger middle-market platform on top means running two integrations at once, and the US$395 million synergy target assumes overlapping functions come out cleanly. Broker integrations tend to leak producers, and USI's value is concentrated in the relationships its 10,500 employees hold, not in its systems.

Is an all-debt deal the right structure at this price? Funding US$17 billion entirely with borrowings pushes leverage higher at a company that has been working to bring it down. If middle-market organic growth slows or property rates keep softening, the interest burden becomes a fixed cost against a variable revenue line. Aon's answer is that the acquired earnings are immediately accretive, but that logic holds only while the acquired business grows.

Does more consolidation actually help the midsize buyer? Aon frames scale as a data advantage. Clients and regulators may see fewer independent alternatives, and a broker that also owns the analytics and the placement relationships has some conflicts to manage. Whether the promised pricing edge shows up in what midsize companies actually pay is the test that matters, and it will not be visible for several renewal cycles.

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