Aon issues $13.5 billion in notes; USI broker changes await closing

Aon’s subsidiaries issued $13.5 billion in notes on September 17, 2026, and Aon entered a $4 billion delayed-draw term-loan agreement the next day as it prepared its proposed $17 billion cash purchase of USI. The loan agreement makes borrowing available to Aon’s North American subsidiary at closing, subject to conditions. Aon’s proposed changes to USI producers’ placement and servicing work remain plans.

For USI producers, Aon and NFP teams, and middle-market clients, the practical question is how insurance placements and client service would be handled after a merger. Aon and USI signed their agreement on August 30. Aon said the firms would operate independently until closing, which it anticipated in the fourth quarter of 2026, subject to regulatory approvals and other conditions.

Financing and purchase price are different measures

The note issuance generated approximately $13.4008 billion in net proceeds. Six series totaling $11.5 billion are designated USI Acquisition Notes and carry a specified redemption provision if the deal fails. A separate $2 billion series due in 2056 does not carry that provision. The notes have been issued; that does not mean the purchase has closed or that their full face value has been paid to USI’s sellers.

The announced $17 billion cash purchase price is subject to adjustments and includes treatment of USI debt. Aon’s preliminary pro forma accounting describes approximately $12.5 billion in merger consideration, $3.8 billion in USI debt required to be repaid and $649 million associated with settlement of additional debt. Those figures are estimates rather than final closing amounts. Aon also arranged a $3 billion revolving commitment to replace two $1 billion facilities; that credit capacity is separate from the stated purchase price.

The proposed broker-work changes

In its August 31 investor presentation, Aon proposes extending Aon and NFP tools to USI producers, routing some excess-and-surplus placements through combined specialty or wholesale capabilities, and moving some administrative and servicing work to shared delivery. The presentation identifies potential changes in responsibilities. It does not establish that a client’s placement route or service team has changed.

USI’s audited statements report $2.971997 billion in 2025 total revenue from commissions, fees and other income. That historical revenue is distinct from insurance premiums placed and from Aon’s forecast of $395 million in annual run-rate adjusted-EBITDA synergy impact at full realization. Aon also estimates $160 million in transaction costs, $550 million in integration costs and up to $400 million in retention and performance incentives. Its pro forma statements exclude future synergies and integration costs, so they do not demonstrate that those projections have been achieved.

The next documented milestone is the proposed closing, which Aon anticipated in the fourth quarter of 2026 subject to the agreement’s conditions. Until then, the financing arrangements and the proposed distribution changes have different statuses: the notes are issued, the loan is conditional closing-date capacity, and the broker-work changes have not been established as operating practice.