Aon has agreed to acquire USI Insurance Services for $17 billion, creating a larger platform for serving midsized businesses and adding another major transaction to the rapidly consolidating insurance brokerage industry.
The cash deal will bring USI, one of the largest insurance brokerages in the United States, under Aon's global business. USI currently generates about $3 billion in annual revenue and employs more than 10,500 people across nearly 200 offices.
Aon expects the transaction to close in the fourth quarter of 2026, subject to regulatory approvals and other customary conditions. Until the deal closes, Aon and USI will continue to operate independently.
What are the key terms of the Aon-USI deal?
Aon will pay a total purchase price of $17 billion in cash to acquire USI from KKR and other shareholders. Aon calculates the net purchase price at approximately $16.7 billion after accounting for about $278 million in tax attributes.
The company plans to finance the acquisition with new debt raised across different maturities. Aon says it expects to maintain its current investment-grade credit ratings, although reducing debt will become a near-term capital priority.
Here are the central details:
- Total purchase price: $17 billion in cash
- Net purchase price: approximately $16.7 billion
- USI annual revenue: about $3 billion
- Expected closing: fourth quarter of 2026
- Funding: new debt, subject to market conditions
- Expected earnings impact: dilutive in 2027 and accretive from 2028
Both Aon's board and USI's board have unanimously approved the transaction.
Why Aon wants to acquire USI
The deal is designed to strengthen Aon's position in the U.S. middle market, which includes businesses that are often too large for small local brokers but do not have the scale or risk teams of the world's biggest corporations.
These companies still need help arranging property and casualty insurance, employee benefits, retirement services and specialized risk coverage. The segment is valuable because client relationships can extend across several products and renew over many years.
USI has built a significant presence in this market. Its services include commercial property and casualty coverage, employee benefits, personal risk, retirement solutions and specialized insurance programs.
Aon CEO Greg Case said the acquisition would expand the firm's middle-market footprint and increase its reach in the excess and surplus insurance segment. That part of the market covers risks that standard insurers may be unwilling or unable to write and has become one of the faster-growing areas of U.S. commercial insurance.
The deal builds on Aon's earlier NFP acquisition
USI is not Aon's first major attempt to expand in the middle market.
In 2024, Aon completed its acquisition of NFP in a deal valued at about $13 billion. NFP brought capabilities in middle-market property and casualty insurance, employee benefits, wealth management and retirement planning.
Buying USI would add another large brokerage network to that strategy. Aon expects the combined middle-market platform to provide greater access to data, insurance markets and specialist advice while spreading technology and administrative costs across a larger client base.
The transaction also shows how highly major brokers value distribution. Insurance brokerage businesses do not take on insurance risk in the same way as insurers. Instead, they advise clients, arrange coverage and earn commissions or fees. Their client relationships, renewal books and networks of experienced brokers can therefore be difficult and time-consuming to recreate organically.
What happens to USI's leadership?
USI Chairman and CEO Mike Sicard is expected to become president of Aon and global CEO of Aon's middle-market business after the acquisition closes. He will report to Greg Case.
Keeping USI's senior leadership involved may help Aon retain clients and employees during the integration. In brokerage deals, the value of the acquired company depends heavily on its client-facing teams and their long-standing relationships.
Aon and USI have said the companies share a collaborative operating culture. The practical challenge will be combining platforms and back-office functions without disrupting service for clients whose insurance and employee-benefit programs operate on fixed renewal schedules.
How much does Aon expect to gain from the acquisition?
Aon is targeting approximately $395 million in annual run-rate net adjusted EBITDA impact from revenue and cost synergies across the combined middle-market platform.
The company expects the deal to reduce adjusted earnings per share in 2027 before becoming accretive in 2028 and later years. That timeline reflects the cost of financing the acquisition as well as the time required to integrate the businesses and realize planned efficiencies.
The net purchase price represents about 14.5 times USI's synergized trailing 12-month adjusted EBITDA, according to Aon's transaction announcement. That valuation underlines both the quality of USI's business and the high prices buyers are willing to pay for large brokerage platforms.
However, projected synergies are not guaranteed. They depend on successful integration, client retention, cost management and the timing of regulatory approvals.
Why Aon is pausing share buybacks
Funding a $17 billion cash acquisition with debt changes Aon's immediate financial priorities.
The company does not expect to repurchase shares in the near term as it focuses on reducing leverage. Aon plans to continue funding a stable and growing dividend while balancing investment in the business with debt repayment.
Investors will watch how quickly Aon can lower leverage without slowing growth. They will also assess whether the eventual earnings contribution from USI is large enough to justify the acquisition price and financing costs.
What the sale means for KKR
The transaction represents a major exit for private-equity firm KKR, which became an investor in USI in 2017 and later increased its ownership.
Reuters reported that KKR expects a return of more than six times its original investment. The sale arrives as private-equity firms look for opportunities to return capital to investors after a period in which higher borrowing costs made large exits more difficult.
USI's rise in value also reflects the broader appeal of insurance distribution businesses. Brokerages can generate recurring revenue through annual renewals, and consolidation can create opportunities to add services or negotiate from a larger position in the insurance market.
Insurance brokerage consolidation is accelerating
The insurance brokerage sector remains fragmented despite several large transactions. Buyers have continued to pursue scale as corporate risks become more complex and clients demand expertise in areas such as cyber insurance, employee health costs and specialized liability coverage.
Recent large transactions have included Arthur J. Gallagher's acquisition of AssuredPartners and Brown & Brown's purchase of Accession Risk Management. Aon's move for USI places another significant brokerage platform inside one of the industry's biggest global groups.
Scale can give a broker more data, greater investment capacity and wider access to insurance markets. At the same time, large acquisitions bring execution risks, including cultural integration, employee retention and regulatory scrutiny.
The bottom line
Aon's $17 billion acquisition of USI is a major bet on the U.S. middle-market insurance business. The deal adds roughly $3 billion in annual revenue, more than 10,500 employees and a broad national office network to Aon's platform.
The acquisition is expected to close in the fourth quarter of 2026 and become accretive to adjusted earnings in 2028. Before then, Aon must secure approvals, finance the purchase and integrate a relationship-driven business without losing the people and clients that make USI valuable.
