Aon Reinsurance Solutions

Aon Reinsurance Solutions is the reinsurance brokerage and advisory division of Aon plc, operating as one of the two dominant global reinsurance brokers by revenue. The unit places treaty and facultative reinsurance, structures insurance-linked securities (ILS), and provides analytics-driven risk transfer advisory to insurers and reinsurers worldwide across more than 80 countries.

The division traces its roots to 1973 and gained significant scale through Aon's 2008 acquisition of the Benfield Group, which created what was then branded as Aon Benfield. The division was rebranded as Aon Reinsurance Solutions as part of Aon's broader Aon United operating model. For full-year 2025, the division generated USD 2.793 billion in revenue -- a 5% increase over 2024's USD 2.656 billion -- with 6% organic revenue growth. Q4 2025 alone delivered USD 379 million in revenue with 8% organic growth, driven by double-digit expansion in insurance-linked securities and the Strategy and Technology Group.

A major 2025 milestone was the expansion of the Aon Client Treaty (ACT) into facultative reinsurance in September 2025, allowing business from Aon's USD 6 billion facultative portfolio to be placed through the pre-secured Lloyd's capacity facility. ACT maintained its 28.5% line size for 2026 and further expanded into Aviation and Space segments. For the April 1, 2026 renewal, global reinsurer capital reached a record USD 785 billion, creating favorable conditions for cedants and enabling double-digit rate reductions in key markets such as Asia Pacific.

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