Aon to acquire USI to establish the premier U.S. middle-market platform

• Builds on the successful acquisition of NFP to advance leading platform in the large and growing U.S. middle market
• Extends Aon’s differentiated capabilities to provide better choice, superior solutions and greater value for clients
• Expands Aon’s access to the Excess & Surplus (E&S) segment, among the fastest-growing areas in U.S. commercial insurance
• Enhances Aon’s industry-leading data platform, deepening its context advantage
• Following the close of the transaction, USI Chairman and CEO Mike Sicard will serve as President of Aon plc and global CEO of Middle Market for the firm
• Purchase price of $17.0 billion; transaction expected to deliver $395 million in annual run-rate net adjusted EBITDA impact from revenue and cost synergies across the combined middle-market platform and to be accretive to adjusted EPS in 2028
• Aon to host conference call to discuss transaction on August 31, 2026, at 8:00 AM ET

DUBLIN, Aug. 31, 2026 /PRNewswire/ — Aon plc (NYSE: AON), a leading global professional services firm, today announced the signing of a definitive agreement to acquire USI from KKR and other shareholders for a total purchase price of $17.0 billion. The transaction establishes the premier platform in the large and growing U.S. middle-market segment, building on the success of Aon’s acquisition of NFP in 2024.

USI, a leading provider of property & casualty, employee benefit, personal risk and retirement solutions for the middle market, is the tenth largest U.S. insurance broker with approximately $3 billion in annual revenue and more than 10,500 team members across nearly 200 U.S. offices. Powered by its proprietary USI ONE® platform for analytics, networked resources and strategic planning to inform and advise clients, USI is highly complementary with Aon’s one-firm, Aon United strategy and global Aon Business Services operating and technology engine.

“In a time of rising complexity and volatility, creating better outcomes for clients across their risk and people challenges requires a combination of capabilities and expertise supported by proprietary data, analytics and technology,” said Greg Case, President and CEO of Aon. “Through the successful execution of our 3×3 Plan to accelerate our Aon United strategy, we have significantly strengthened our firm to build the industry’s most differentiated model: what we call our context advantage.”

Case added: “Combining with USI will establish the premier U.S. middle-market platform, deepen our context advantage and position Aon to accelerate organic growth. Building on the success of our acquisition of NFP, USI will substantially enhance our middle-market footprint and expand access for our firm in the E&S segment to deliver content, capabilities and expertise to a broader client base, while enabling client leaders to expand relationships and win new business. Our combined data platform will generate richer insight, advance the development of innovative, AI-driven solutions and expand the universe of insurable risk, while further reinforcing the context advantage that differentiates Aon. For nearly two decades, Mike Sicard has built and led a high-performing and integrated team, and I am excited about the opportunities we will create together for our clients, colleagues and shareholders.”

Following the close of the transaction, USI Chairman and CEO Mike Sicard will serve as President of Aon plc and global CEO of Middle Market, reporting to Case, and join the Aon Executive Committee.

“Joining Aon represents a truly energizing next chapter for our firm and an opportunity to accelerate our momentum as part of the Aon United platform,” said Sicard. “Our firms share strong, one-firm cultures with a deep commitment to working together to bring the best of our capabilities to clients. I look forward to leading Aon’s middle-market platform and uniting the strengths of USI, NFP and Aon to deliver a new standard of content, capabilities and service to our clients.”

Compelling Strategic and Financial Rationale

• Establishes the leading platform in the large and growing U.S. middle-market segment. The addition of USI substantially enhances Aon’s presence in the more than $40 billion U.S. middle-market segment. The middle-market segment represents more than one third of U.S. commercial P&C direct written premium. The acquisition will also extend Aon’s capabilities across health, talent and Human Capital advisory offerings to provide better choice, superior solutions and greater value for clients.
• Expands Aon’s direct access to the E&S segment, distributed through Managing General Agents, Managing General Underwriters and Wholesalers. USI’s emerging wholesale capabilities will strengthen Aon’s ability to meet a wider range of client needs and meaningfully participate in the E&S segment, among the fastest-growing areas in U.S. commercial insurance, representing 26% of U.S. commercial P&C premiums.
• Enhances Aon’s industry-leading data platform, deepening its context advantage. The transaction will expand Aon’s data ecosystem and augment the firm’s proprietary data flow, fidelity and analytics to generate richer insights and deliver differentiated, AI-enabled solutions and drive better client outcomes.
• Unites organizations with shared one-firm mindsets and proven leadership teams, facilitating a faster, more seamless integration and greater value capture. Powered by its proprietary USI ONE® platform for analytics, USI is highly complementary with Aon’s one-firm, Aon United strategy and global Aon Business Services operating and technology engine. With experienced leadership across USI, NFP and Aon, the combined firm will be well positioned to capture the unique value of its middle-market platform.
• Creates compelling long-term shareholder value with significant synergies, enhanced growth opportunities and larger addressable markets. The combination is expected to accelerate organic growth across Aon’s middle-market platform by enhancing client access to value-added capabilities. Building on the firm’s demonstrated success in integrating NFP, Aon has a clear path to deliver approximately $395 million in annual run-rate net adjusted EBITDA impact from identified revenue and cost synergies across the combined middle-market platform. Aon expects the acquisition to be accretive to adjusted EPS in 2028 and thereafter.

Transaction Details

The purchase price for USI is $17.0 billion, or $16.7 billion on a net basis, which reflects approximately $278 million of certain tax attributes. The net purchase price represents approximately 14.5x on a synergized trailing twelve-month adjusted EBITDA basis.

Aon expects to fund the transaction, as well as related transaction expenses and other costs, with new debt raised across a range of maturities, subject to market conditions.

The firm expects to maintain its current rating of Baa2 with Moody’s and A- with S&P. Aon will continue to execute its disciplined capital allocation strategy, prioritizing de-leveraging, funding a stable and growing dividend and balancing investments for growth with return of excess capital. Consistent with this strategy, the firm does not expect to repurchase shares in the near-term as it prioritizes debt repayment.

The transaction has been unanimously approved by the Board of Directors of Aon and the Board of Directors of USI. Closing of the transaction is subject to customary conditions, including regulatory approvals, and is expected to occur in the fourth quarter of 2026. Aon and USI will continue to operate independently until the closing date.