Aon and Blackstone Funds Launch Cortina Reinsurance Syndicate

Aon announced on November 6, 2026 that it and funds managed by Blackstone had launched Cortina syndicate 1956, a new Lloyd’s syndicate intended to provide dedicated, multi-year reinsurance capacity and broaden the capital available to clients. QBE will act as managing agent.

Cortina received Lloyd’s Council’s in-principle approval on October 16, 2026. It is still working with Lloyd’s to complete the necessary “Making It Happen” actions before permission to underwrite can be granted. The intended start is January 1, 2027, subject to final Lloyd’s approval, so the launch establishes the vehicle and its partnerships but does not mean reinsurance underwriting has begun.

Client Economics Depend on Treaty Participation

The operating model is designed to bring long-term institutional capital into the market and pass structural efficiencies to cedents. Participating clients will receive those efficiencies through a dividend based on Cortina’s share of their reinsurance programs. The syndicate will offer following capacity on all eligible treaties under a defined framework, with the multi-year structure intended to provide stable capacity across renewal cycles.

The announcement defines participation through treaty shares rather than a monetary capital commitment. For participating clients, Cortina will write 3% of eligible property catastrophe excess-of-loss treaties arranged by Aon and 5% of all other eligible treaties arranged by Aon. The percentages establish the syndicate’s share of eligible business, but not the total monetary capacity behind it.

Cortina will complement traditional reinsurers through a conventional lead/follow approach. On each placement, it will follow the terms and claims decisions set by the lead reinsurer or reinsurers, leaving their underwriting role at the center of the program rather than replacing it. Within that arrangement, QBE’s managing-agent responsibilities cover Cortina’s underwriting and governance. The structure also provides clients with the financial security of a Lloyd’s syndicate carrying an A+ financial strength rating.

London Bridge 2 Connects the Capital to Lloyd’s

Blackstone president and chief operating officer Jon Gray said the partnership with Aon and QBE would broaden the capital pools available to reinsurance and strengthen resilience across market cycles, and that Blackstone remains a long-term investor in the sector.

QBE International CEO Jason Harris called Cortina “a first-of-its-kind model for reinsurance capacity at Lloyd’s,” saying it combines long-term institutional capital with stable, disciplined capacity while QBE Re maintains its focus on long-term partnerships.

Lloyd’s CEO Patrick Tiernan said the transaction uses its London Bridge 2 framework to connect new long-term capital with Lloyd’s underwriting and oversight standards, with the aim of creating long-term value for clients, investors and the marketplace.

The immediate open question is whether Cortina can complete the remaining Lloyd’s actions and convert in-principle approval into final permission in time for its intended January 2027 start. Until then, the treaty percentages and dividend define the proposed client proposition; final approval is what would allow that structure to begin supplying reinsurance capacity.