The outstanding market for collateralized reinsurance sidecar structures has continued to grow at pace thanks to investor interest in the structures, with the latest estimate from Aon Securities putting invested capital in sidecar vehicles at a new high of $19.6 billion.
Aon’s latest estimate shows growth in both property and casualty reinsurance sidecars in the second-half of 2025, resulting in a new record size for the collateralized sidecar marketplace.
Previously, Aon Securities data shows that reinsurance sidecars reached a new record high of $17 billion as of June 30th 2025, representing around 70% expansion of this segment of the ILS market in just one year.
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