Aon Nears $17 Billion Deal for KKR-Backed Broker USI Insurance

In one of the largest insurance brokerage transactions in years, Aon is nearing an agreement to acquire USI Insurance Services for roughly $17 billion, according to a report published Tuesday. The deal would fold one of the largest privately held brokers in the United States into the global professional services firm.

USI Insurance is currently backed by private equity firm KKR, which took a majority stake in the company in 2017. A completed sale at the reported valuation would give KKR and other investors an exit from a business that has expanded steadily across commercial insurance, employee benefits, and risk management services.

Aon, a global broker that advises clients on insurance, reinsurance, and human capital, has pursued scale through acquisitions before. The firm previously attempted a roughly $30 billion merger with rival Willis Towers Watson, a plan abandoned in 2021 after regulators in the United States moved to block it on competition grounds.

The USI transaction would rank among the sector’s biggest since that failed combination, and it points to renewed appetite for consolidation among the largest brokerages. Buyers have been drawn to middle-market insurance advisory businesses, which generate steady fee income and hold deep relationships with small and mid-sized corporate clients.

For the companies’ clients, the practical question is continuity of service and pricing. USI serves a wide base of businesses that rely on it to place coverage and manage benefits programs, and any integration would test how smoothly two large advisory operations can be merged without disrupting those accounts.

Large brokerage tie-ups have drawn scrutiny in recent years, as regulators weigh whether fewer independent players reduce competition for corporate insurance buyers. Aon’s earlier experience with the Willis deal shows how antitrust review can reshape or unwind even advanced agreements. This latest move joins a run of major private-equity-linked exits, echoing other large take-private and ownership transitions reshaping corporate portfolios.

Neither Aon nor USI has confirmed final terms, and the reported figure could shift before any announcement. Talks at this stage can still collapse over price, financing, or due diligence.

If completed, the acquisition would broaden Aon’s footprint in the American middle market and hand KKR a return on a nearly decade-long investment. Clients, employees, and regulators will watch closely to see whether the combined firm expands choice or narrows it as the deal moves toward formal review.

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