Aon is a global professional services firm that provides risk, retirement and health solutions and reinsurance brokerage and advisory services. Reinsurance market dynamics report Casualty reinsurance demand is broadly flat for mid-2026 renewals, while pricing conditions remain favorable in the U.S. and international markets due to increasing capacity and continued competition.
Aon noted that demand for casualty reinsurance was generally unchanged, with insurers largely maintaining existing net retention and focusing on improving program structures rather than expanding purchases.
The firm observed that recent portfolio consolidation activity in previous years has led some cedants to re-evaluate their reinsurance purchases with a focus on efficiency and value. While net retention rates are generally stable, Aon highlighted that some insurers continue to explore alternative structures and insurance-linked securities solutions to manage cost pressures and diversify sources of reinsurance capital.
Aon reports that capacity in the U.S. and international casualty markets is adequate and growing, supported by the return of traditional reinsurers and continued interest from third-party capital providers.
In the U.S., Aon highlighted increased participation from reinsurers looking to participate in casualty insurance programs, along with disciplined underwriting and account-specific target growth. Internationally, Aon noted, competition remains strong, with higher oversubscription levels for lower-risk ventures, while more complex projects and those in the U.S. attract a more selective but well-capitalized market.
Pricing conditions at mid-year renewal were generally favorable, according to Aon. U.S. casualty excess loss pricing was down approximately 5% to 10%, while international XL pricing was essentially flat to down 10%. The pro-rata arrangement also reflects favorable market conditions, with commission splits across the two regions broadly flat to up 1% supported by continued demand for quota share structures as insurers seek to manage volatility and optimize returns.
Aon said overall terms and conditions remained stable and there was no material tightening in the middle of the year. Utilization of the quota share structure has improved as insurers respond to weak base rate conditions in parts of the market and seek more flexible capital and yield management solutions, the company added.
The company also highlighted continued strong demand for traditional reinsurance solutions, including loss portfolio transfer and adverse development protection. These transactions are used more widely as capital management tools, particularly following mergers and acquisitions or changes in strategic direction, and current market conditions are supported by strong capabilities and an active competitive environment.
In Financials and Professionals, Aon reported overall stable to slightly improving reinsurance performance in the Directors and Officers business, supported by underlying market stability and increased capacity. Aon further pointed out that the trading liabilities unit is in a period of adjustment after adverse losses outside standard warranty and indemnity coverage, and tighter controls on managing general agents may affect future capacity and reinsurance demand.
Aon concluded that the mid-2026 casualty reinsurance profile is driven by flat demand, increased capacity and generally favorable pricing, providing cedants with flexibility as they prepare for the upcoming 1/1 renewal season.
Alex Chittock, head of international casualty at Aon Re, commented: “The international casualty reinsurance position remains strong, with ample capacity and diverse demand across classes and structures, giving cedants room to design programs that fit their changing portfolios.”
“U.S. casualty underwriters are seeking credit for the improvements they have made in underwriting, pricing, segmentation and claims processing, and rightly so. Reinsurers are recognizing these improvements by adding capacity,” added Nick Nudo, head of U.S. casualty reinsurance at Aon.
