Aon’s latest Reinsurance Market Dynamics report for mid-year 2025 shows that conditions continued to shift in favor of buyers, with increased flexibility in terms and conditions and expanded coverage options.
Despite overall price moderation, renewal outcomes were mixed, with reinsurers differentiating based on loss experience and performance.
The June 1 and July 1 renewals, critical periods for markets including the US, Latin America, Australia, and New Zealand, occurred amid a competitive landscape. Despite an active first half for natural catastrophe losses, capacity from traditional reinsurers, insurance-linked securities (ILS) markets, and new entrants exceeded demand.
Reinsurance capacity was sufficient to meet a nearly 10% global increase in demand for property catastrophe limits. This demand was influenced by depopulation at Florida’s Citizens Property Insurance Corporation, inflation, model revisions, and updated catastrophe exposure views. Recent wildfires in the US and floods in Brazil contributed to insurers reassessing loss exposure and adjusting protection strategies.
Global reinsurance capital reached US$720 billion in the first quarter of 2025, up from US$715 billion in 2024, driven largely by retained earnings. Two-thirds of reinsurers tracked by Aon reported double-digit annualized return on equity for the first quarter.
The catastrophe bond market continued its expansion, reaching record issuance of over US$16.8 billion during the first half of 2025. This included the two largest catastrophe bond transactions ever recorded, each exceeding US$1.5 billion.
The scale of these deals reflects growing investor appetite for alternative reinsurance solutions and the increasing use of capital markets to manage peak catastrophe risk. Aon noted that this influx of ILS capital contributed to the competitive pricing environment, particularly in the middle layers of catastrophe programs where such capital is most active.
Casualty reinsurance renewals remained relatively stable earlier in the year. Aon reported that insurers in this segment entered renewals with favorable conditions due to prior underwriting discipline and strong base pricing.
Although some reinsurers have withdrawn from certain lines within the US market, others have increased participation, resulting in steady capacity overall. Reinsurers remain cautious about litigation risk, loss development, and emerging exposures, but continued to engage with clients demonstrating robust risk management practices. High interest rates and expectations for tort reform have also helped sustain reinsurer interest in well-performing books.
As insurers navigate this environment, interest in alternative capital and non-traditional structures continues to grow. Aon reported a surge in demand for facultative reinsurance, structured solutions, automated facilities, and parametric products that offer flexibility in volatile conditions. These approaches are increasingly being used to complement traditional placements and build resilience.
Aon also highlighted the use of alternative capital to create competitive tension, particularly for programs with clean loss experience or diversified geographic exposure. Such capital sources are being actively considered not just for catastrophe protection but also to manage emerging risks, including cyber.
The property catastrophe segment saw increased supply and competitive pricing across all regions. Reinsurers showed more appetite for lower layers of risk, and discussions resumed around products such as aggregate covers. Competition was strongest in middle layers where ILS capital was active.
US, Australian, and New Zealand placements without losses achieved low double-digit risk-adjusted rate reductions. However, accounts with loss histories saw rates remain flat or increase. Latin America and the Caribbean saw moderate decreases, as pricing in the region began to ease from previous highs.
Florida and non-loss-affected US regional insurers also reported improved renewals, reflecting portfolio adjustments and legislative changes that have influenced reinsurer confidence.
While conditions improved, Aon noted persistent volatility. Ongoing geopolitical conflicts and trade tensions raise the potential for inflation and supply chain disruption. Social inflation, cyber risk, and extreme weather continue to challenge both insurers and reinsurers.
Forecasters expect an above-average North Atlantic hurricane season. Global insured losses from natural catastrophes in Q1 2025 totaled approximately US$60 billion, the second highest Q1 total on record, with US$40 billion linked to California wildfires. Additional severe weather outbreaks in May could make the first half of the year the second costliest ever recorded.
At mid-year, Aon placed a stop loss reinsurance cover designed to protect a client from cumulative cyber losses across multiple insureds, underscoring the expanding role of innovative structures in managing systemic risk.
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