Aon Buys USI Insurance From KKR for $17 Billion, Doubling Down on Middle Market

Aon agreed on August 31 to acquire USI Insurance Services from KKR and other shareholders for $17 billion in cash, the company confirmed in an 8-K filed with the SEC the same day. The purchase follows Aon's $13 billion acquisition of NFP in 2024 and pushes the Dublin-headquartered broker further into U.S. middle-market insurance, a segment it values at more than $40 billion.

According to a press release reviewed by Business Wire, Aon will fund the transaction entirely through new debt and does not plan to repurchase shares while it pays that debt down. The company said it expects to stay investment-grade, holding Baa2 at Moody's and A- at S&P. BofA Securities and Citi are advising Aon; Cravath, Swaine and Moore is handling legal work.

The price works out to roughly 14.5 times USI's synergized trailing-twelve-month adjusted EBITDA, net of about $278 million in tax attributes, according to Insurance Business magazine. Aon projects $395 million in annual run-rate net adjusted EBITDA from cost and revenue synergies across the combined platform, and said the deal will add to adjusted earnings per share in 2028. That's a two-year wait. The market appeared skeptical from the start: Aon's stock had already slipped 5.6 percent from its July earnings-day close to $355.40 by the Friday before the deal was confirmed, according to CNBC.

USI is the tenth-largest U.S. insurance broker, generating roughly $3 billion in annual revenue from more than 10,500 employees across nearly 200 offices, according to the Insurance Journal. The Valhalla, New York-based firm covers property and casualty, employee benefits, personal risk, and retirement products for mid-sized businesses. Aon also cited USI's wholesale capabilities as a way into the excess and surplus market, which accounts for 26 percent of U.S. commercial property and casualty premiums.

For KKR, the exit is a clean win. The firm and Canadian pension fund Caisse de depot et placement du Quebec bought USI in 2017 for $4.3 billion including debt, according to Insurance Business. Under KKR's ownership, USI nearly tripled its revenue and completed more than 90 acquisitions, per a KKR statement. As the deal's largest shareholder, KKR expects to recognize approximately $3.3 billion in after-tax proceeds, generating a 3.4 times return on balance-sheet capital, according to the Claims Journal. KKR said the transaction will put its 2026 adjusted net income well ahead of earlier guidance.

USI's chairman and CEO Mike Sicard will move to Aon as president and global CEO of middle market, reporting to Aon CEO Greg Case. The two firms will operate separately until close, which both sides target for the fourth quarter of 2026, pending regulatory approval.

The deal lands inside a wider surge in PE exits. The Claims Journal noted that Apollo Global Management separately struck a $4.1 billion deal on the same day to sell Kelvion, a German cooling-equipment maker it had held for just eight months. KKR's private equity assets under management have roughly doubled since 2020, and the firm raised a record $23 billion for its latest Americas buyout fund earlier this year, per the Claims Journal.

The synergy math Aon is offering investors is specific, which is useful. What it doesn't tell you is how much of the $395 million is cost-cutting versus genuine revenue growth, or what the integration drag looks like on a platform that already absorbed NFP less than two years ago. Forward guidance from a CEO on an acquisition call deserves the same scrutiny as forward guidance anywhere else.

Sources cited:
- SEC Form 8-K, Aon plc (FY2026) (https://www.sec.gov/Archives/edgar/data/0000315293/000119312526375328/d108801dex991.htm)
- Yahoo Finance / Reuters (https://finance.yahoo.com/markets/stocks/articles/aon-acquires-usi-insurance-services-120021010.html)
- CNBC (https://www.cnbc.com/2026/08/30/aon-usi-17-billion-deal-talks.html)
- Insurance Journal (https://www.insurancejournal.com/news/national/2026/08/31/883334.htm)
- Insurance Business (https://www.insurancebusinessmag.com/us/news/benefits/aon-strikes-17-billion-deal-for-usi-doubling-down-on-the-middle-market-587920.aspx)
- Claims Journal (https://www.claimsjournal.com/news/national/2026/08/31/339866.htm)
- Business Wire (KKR press release) (https://www.businesswire.com/news/home/20260831081134/en/KKR-To-Sell-USI-to-Aon-plc-in-$17-Billion-Transaction)