Aon Acquires USI for $17B, Dominates Middle Market

In a significant move to solidify its dominance in the U.S. insurance brokerage arena, Aon plc has agreed to acquire USI Insurance Services for a substantial $17 billion. This strategic maneuver, set to close in late 2026, aims to forge what the companies are calling the preeminent platform for the expansive and dynamic U.S. middle-market segment. The acquisition from sellers including private equity giant KKR, marks a pivotal expansion for Aon, building on its recent acquisition of NFP earlier in 2024.

USI Insurance Services, currently the tenth-largest broker in the United States, brings approximately $3 billion in annual revenue and a workforce exceeding 10,500 professionals spread across nearly 200 offices nationwide. The Valhalla, New York-based firm offers a comprehensive suite of services, including property and casualty, employee benefits, personal risk management, and retirement solutions, catering specifically to mid-sized enterprises. This integration is expected to significantly bolster Aon's direct engagement with the U.S. middle market, a sector valued at over $40 billion, and enhance its access to the lucrative Excess & Surplus (E&S) lines, which account for a quarter of all U.S. commercial P&C premiums.

The strategic rationale behind this blockbuster deal extends beyond market share. Aon anticipates substantial operational efficiencies and revenue enhancements, projecting $395 million in annual run-rate net adjusted EBITDA from combined synergies. The acquisition price reflects a valuation of roughly 14.5 times the synergized trailing twelve-month adjusted EBITDA of USI. This transaction is anticipated to boost Aon's adjusted earnings per share starting in 2028, demonstrating a clear long-term value creation strategy. The deal's structure also emphasizes Aon's commitment to enhancing its data analytics and AI-driven solution development capabilities.

Greg Case, Chief Executive Officer of Aon, articulated the vision, stating, "The combination with USI will create the leading U.S. middle-market platform, deepening our contextual advantage and enabling Aon to accelerate organic growth." Complementing this, Mike Sicard, Chairman and CEO of USI, will transition to President of Aon plc and global CEO of Middle Market, joining the executive leadership team. Sicard expressed enthusiasm for the integration, calling it an "energizing next chapter."

Financing for this substantial acquisition will be secured through new debt instruments across various maturities, contingent on prevailing market conditions. Aon has indicated its intention to maintain its current investment-grade credit ratings, holding Baa2 from Moody's and A- from S&P. The company's capital allocation priorities will focus on de-leveraging, with no near-term share repurchases planned, balancing debt reduction with consistent dividend payouts and strategic growth investments.

This acquisition underscores Aon's aggressive strategy to expand its footprint in the U.S. insurance brokerage sector. Following the earlier acquisition of NFP and other targeted initiatives, the integration of USI Insurance Services represents a concentrated effort to build an unparalleled offering for the vital U.S. middle-market businesses, a segment critical to the nation's economic engine.