Aon is nearing a roughly $17 billion deal to acquire USI Insurance Services from KKR, a potential transaction that would sharply expand the global insurance broker’s presence among midsize U.S. businesses.
The proposed acquisition, valued at about $17 billion including debt, could be announced as soon as Monday, August 31 if negotiations are completed. No definitive transaction has been publicly announced, meaning the terms could still change or talks could end without an agreement.
AON-USI DEAL: KEY DETAILS
Buyer: Aon plc
Target: USI Insurance Services
Largest shareholder: KKR
Reported value: About $17 billion, including debt
USI annual revenue: Roughly $3 billion
Possible announcement: As early as Monday, August 31
Status: Advanced negotiations; not yet a completed deal
Why Aon wants USI Insurance
USI is a major U.S. insurance brokerage and consulting company headquartered in Valhalla, New York. Its businesses include property and casualty insurance, employee benefits, personal risk and other risk-management services.
The company generates roughly $3 billion in annual revenue and has grown to more than 10,000 employees and over 200 offices. That nationwide footprint would give Aon substantially greater access to middle-market businesses.
The strategy is familiar. Aon completed its acquisition of NFP in 2024 in a transaction valued at roughly $13 billion, expanding its middle-market insurance, benefits, wealth and retirement businesses.
According to the Wall Street Journal report on the Aon-USI negotiations, the proposed transaction is expected to increase Aon’s earnings per share as soon as 2028, according to a person familiar with the matter.
USI’s value has surged under KKR
KKR’s history with USI dates to 2017, when KKR and Canadian investment group CDPQ acquired the brokerage from Onex in a transaction valuing it at approximately $4.3 billion including debt.
At the time, USI employed more than 4,400 people across about 140 offices. KKR later increased its investment, committing more than $1 billion of additional equity in 2023 as part of a transaction that made it USI’s largest shareholder.
A $17 billion enterprise value would be almost four times USI’s 2017 valuation. That difference is not KKR’s direct profit because additional investment, ownership changes and debt must be taken into account.
How big is the deal for Aon?
Aon has a market capitalization of roughly $75 billion, putting the size of the proposed acquisition into perspective. The reported $17 billion enterprise value is equivalent to nearly 23% of Aon’s market value.
But $17 billion does not necessarily represent the cash Aon would pay USI’s shareholders. Because the figure includes debt, investors will need the final equity purchase price and financing details before they can fully assess the transaction.
If announced, attention will focus on how Aon finances the acquisition, the amount of USI debt assumed or refinanced, expected synergies and whether the deal can deliver the projected earnings benefits.
Why KKR may be selling now
KKR has recently accelerated asset realizations, and a USI sale would represent a major exit after nearly a decade of involvement with the company.
The potential transaction comes as large private-capital deals return to focus, including the Apollo and Atlantic Aviation deal discussions, another multibillion-dollar transaction attracting attention across private markets.
Deal activity is also extending across financial services. The Vanguard and Altruist $4 billion deal provides another example of how major financial companies are pursuing acquisitions as competition for technology, clients and distribution platforms intensifies.
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Could regulators scrutinize Aon’s acquisition?
Regulatory approval could become another important issue if a definitive agreement is signed. Aon previously abandoned its proposed combination with Willis Towers Watson in 2021 after U.S. regulators challenged that transaction on competition grounds.
The USI deal would require a separate assessment and the previous case does not predict the outcome. Still, Aon’s scale and USI’s substantial U.S. brokerage operation could put competition review on investors’ radar.
What it could mean for USI employees and clients
USI employees will be looking for details about leadership, offices, jobs and whether the USI brand would remain after an acquisition. Clients may also want clarity about whether their existing brokers and service relationships would change.
No integration plan has been announced because the proposed transaction has not been confirmed.
The immediate question is whether Aon, KKR and USI reach a final agreement and announce it Monday. Until then, this remains a reported potential acquisition, not a completed $17 billion takeover.
If a deal is confirmed, the final price, financing, expected earnings impact, regulatory conditions and closing timetable will determine how investors judge Aon’s latest major expansion into U.S. insurance brokerage.
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