Global Insurance Broker Aon Acquires USI Insurance Services for Approximately $17 Billion from KKR and Others
Global insurance broker Aon has agreed to acquire USI Insurance Services for approximately $17 billion, with sellers including private equity firm KKR and other shareholders, to expand its insurance and benefits business for mid-sized companies in the U.S. Reports from Reuters indicate that this transaction is one of the largest insurance mergers and acquisitions in recent years.
USI, headquartered in Valhalla, New York, has annual revenues of about $3 billion, over 10,500 employees, and nearly 200 offices, serving mid-sized companies with property liability, employee benefits, personal risk, and retirement plans, ranking about tenth among U.S. brokers. KKR and the Caisse de dépôt et placement du Québec acquired USI from Onex in 2017 for approximately $4.3 billion, including debt, and KKR subsequently increased its stake to become the largest shareholder.
Aon CEO Greg Case stated that the acquisition will significantly strengthen their presence in the mid-market and expand their excess and surplus insurance channels. In 2024, Aon had previously acquired NFP in the same field for $13 billion. The transaction is expected to close in the fourth quarter of 2026, enhancing adjusted earnings per share by 2028, with annualized synergies of approximately $395 million. The funding will primarily come from debt, with no plans for stock buybacks in the near term, prioritizing debt repayment. USI CEO Mike Sicard will serve as Aon's president and head of the global mid-market platform.
The Financial Times reported that KKR has approximately $3.3 billion in post-tax cash, relative to its own investment of about $1 billion, resulting in a multiple of about 3.4 times, and is expected to enhance adjusted net income by about $2 billion. Following the announcement, KKR's stock price rose, while Aon's stock fell by more than 7% at one point.
Market mechanisms indicate that the buyer is acquiring strategic capital to access the mid-market client network and excess insurance channels, while the seller is exiting after holding for eight years. This event is driven by industry consolidation, with funds flowing from Aon bond investors to KKR's balance sheet; benefiting Aon's mid-market line that is expanding its brokerage commission platform, while putting pressure on the valuation anchors of independent brokers who have not yet sold within the same client group.
Source: Public Information
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Mid-market insurance companies are not known for catastrophe models, but for network density and benefits consulting renewals. Aon already has large global clients but lacks brokers at the doorstep of U.S. mid-sized companies. Acquiring a $3 billion revenue network for $17 billion is akin to repeating the 2024 NFP acquisition. The stock initially fell as the market priced in leverage and integration risks.
The capital path involves private equity using its own funds with leverage for eight years, then selling to a strategic buyer for cash. KKR entered at $4.3 billion in 2017 and is exiting at $17 billion in 2026, with multiples derived from the recurring commissions of insurance brokerage, not from one-time underwriting payouts. Money flows from Aon’s bond issuance into KKR, which then becomes ammunition for subsequent transactions according to company strategy. Financial shareholders like CDPQ are also exiting simultaneously.
The benchmark is Marsh's acquisitions of peers and private equity rolling regional brokers into national platforms to sell to public companies. Insurance intermediaries are at a stage where "large brokers use balance sheets to acquire networks": underwriting cycles fluctuate, but brokerage commissions remain relatively stable, making private equity willing to hold long-term and strategic buyers willing to pay a premium. The increasing proportion of excess and surplus insurance represents a new growth line for hard-to-place risks.
Structurally, this belongs to capital concentration. The mechanism is: when mid-sized companies' policies and benefit plans are sufficiently standardized, networks can be packaged and priced. Whoever can replicate consulting content across more client managers' desks can thicken the commission pool. Sellers seek exit multiples, while buyers aim for earnings per share in 2028.
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- Recurring commissions are easier for private equity to sell at a markup than one-time underwriting.
- Large brokers buy networks, not a new insurance license.
- Stocks often fall first, indicating the market is pricing in leverage and integration risks.