Key Takeaways :
* $17 billion acquisition: Aon will acquire USI in an all-cash transaction, with the deal expected to close in **Q4 2026**.
* Major KKR exit : KKR expects approximately $3.3 billion of after-tax proceeds and around $2 billion of adjusted net income from the transaction.
* USI scale: USI generates approximately $3 billion in annual revenue, employs more than 10,500 people and operates nearly 200 U.S. offices.
* Aon expands its middle-market position: The acquisition follows Aon's $13 billion purchase of NFP in 2024 and strengthens its presence across middle-market insurance and excess & surplus lines.
Full Briefing : Aon's $17 billion acquisition of USI is one of the largest recent transactions in insurance brokerage and continues the industry's consolidation around scaled platforms. USI gives Aon greater reach across the U.S. middle market, including property and casualty, employee benefits, personal risk and retirement services.
For KKR, however, the transaction is equally significant. KKR originally invested in USI in 2017, when the company was valued at roughly $4.3 billion. Over the investment period, KKR expanded USI's scale and capabilities before exiting at a substantially higher valuation. KKR says the transaction represents approximately 6x the original equity it invested and 3.4x the total KKR balance-sheet capital invested over the life of the investment.
Aon expects approximately $395 million of annual run-rate adjusted EBITDA impact from revenue and cost synergies, while USI CEO Mike Sicard is expected to become Aon's president and global CEO of its middle-market business.
The executive signal: the transaction illustrates how scale is becoming increasingly valuable in fragmented professional-services markets, while private-equity owners are finding opportunities to monetize mature assets as strategic buyers seek larger, more integrated platforms.
Most organisational structures are built to solve immediate operational constraints rather than anticipating future complexity. When companies double in headcount, communication channels grow exponentially, creating latency and friction that compound faster than revenue.

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