Aon Raises $13.5bn Bond Sale to Finance USI Insurance Services Acquisition
Aon plc has raised $13.5 billion from a high-grade bond offering to help fund its planned acquisition of USI Insurance Services, marking one of the biggest M&A financing deals to come to market in 2026. Investors placed as much as $65 billion of orders on the sale, with the longest maturity drawing the most demand. Aon is also expected to sell a $4 billion term loan as part of the deal financing, according to a S&P Global Ratings note. The transaction came to market even as borrowing costs rose, with both credit and equity markets reacting to wider macro pressures. Aon is one of the world's largest insurance brokers; USI provides insurance brokerage and consulting services to businesses and individuals. The bond sale landed during one of the busiest periods of the year for the US investment-grade market.
Why this matters
A $13.5bn bond raise to fund a single acquisition signals that strategic buyers are willing to absorb materially higher financing costs rather than delay large-scale consolidation in the insurance broking sector. The $65bn order book, nearly five times cover, confirms deep institutional appetite for investment-grade M&A debt even as rates rise globally. The deal sets a 2026 benchmark for leveraged acquisition financing and will be watched closely by other would-be acquirers stress-testing whether debt markets remain open at scale. For the insurance distribution market, Aon-USI consolidation compresses the competitive landscape and accelerates client renegotiation of broker mandates.
On the Ground
The transaction activates a broad team of practice groups: M&A counsel on deal structuring and regulatory approvals, debt capital markets lawyers on the bond documentation, and banking teams on the term loan facility. Competition counsel will need to assess whether the combination of two large US insurance brokers triggers antitrust review. A trainee on this matter would assist with due diligence document review, cap table and financing condition tracking, and preparation of regulatory filing checklists.
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