The catastrophe reinsurance sector has experienced significant shifts in recent years, with aggregate excess-of-loss (XoL) coverage emerging as a key area of focus.
According to Guy Carpenter, market capacity for aggregate XoL protection has declined by more than 80% over the past five years, leaving a notable gap for high-frequency catastrophe loss years.
Randy Fuller (pictured above) of Guy Carpenter notes that many reinsurers have reduced support for lower-attaching programs and coverage for secondary perils, which has contributed to the current shortfall in aggregate XoL offerings.
This shift has led to catastrophe reinsurance programs being recalibrated, with attachment points now generally set at no less than a 1-in-10-year return period. Cedants’ occurrence retentions have increased by 50% to 100%, a trend that is also influencing the design of frequency protection covers.
Filling the aggregate XoL gap presents both a challenge and an opportunity for reinsurers. Guy Carpenter highlights that improved understanding of event frequency, driven by factors such as changing weather patterns, population growth, and inflation, is providing a stronger basis for evaluating frequency exposure.
As market conditions stabilize, reinsurers are expected to develop more effective and sustainable solutions to address frequency-driven volatility.
The specialty reinsurance market is also seeing a notable increase in stability and capital availability. Guy Carpenter previously reported that total dedicated reinsurance capital is projected to reach US$649 billion in 2025, continuing an upward trend.
Traditional reinsurance capital rose by 7% in 2024, supported by strong underwriting results, retained earnings, and higher investment yields. This influx of capital is contributing to a more competitive environment, which may help address gaps in aggregate XoL coverage and provide cedants with more options for risk transfer strategies.
There is also a growing demand for aggregate cover as coverage broadens, especially for secondary perils. New capacity is entering the market, notably from insurance-linked securities carriers, which is helping to diversify sources of capital and increase competition.
This trend is expected to put further pressure on retentions, pricing, and coverage terms at upcoming renewal cycles, making aggregate XoL an even more relevant solution for cedants seeking protection against frequency-driven losses.
Supporting aggregate XoL coverage offers reinsurers portfolio diversification benefits and can enhance relationships with cedants. Fuller states that underwriting frequency protection not only fills a market need but also complements peak peril occurrence-driven exposures.
As competition increases in traditional catastrophe programs, reinsurers that show flexibility in addressing cedants’ volatility challenges may see stronger, more durable partnerships.
Recent months have shown early signs of renewed interest in frequency protection. Guy Carpenter reports a notable rise in quoting activity for these coverages in the first half of 2025, with significant new capacity deployed into large global and U.S. national aggregate programs.
The demand is not limited to large buyers; regional and niche carriers are also seeking solutions to manage frequency-driven losses.
Innovation in parametric solutions and catastrophe modeling is enabling new ways to define triggers and deliver capacity efficiently. For cedants, aggregate XoL protection helps reduce earnings volatility and supports more stable capital planning.
For reinsurers, these structures provide an opportunity to deploy capital in a disciplined manner, meeting persistent demand in the market.
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