Global Catastrophe Reinsurance Broking Landscape
The catastrophe reinsurance broking market is dominated by four global players — Aon Reinsurance Solutions, Guy Carpenter (soon rebranding as Marsh Re), Gallagher Re, and Howden Re — which together command over 85% of placed premium. Below these sit a tier of independent and specialist firms that compete on analytics, market access, and niche expertise.
Market Structure and Concentration
Catastrophe reinsurance is the most broker-intermediated class in the reinsurance market, with approximately 65% of all placements flowing through intermediaries. The top two brokers — Aon and Guy Carpenter — each place over $30 billion in property reinsurance premiums annually. Their scale provides unmatched leverage with reinsurer panels, particularly at January 1 and mid-year renewal dates when the bulk of property catastrophe treaties are placed.
Specialist vs. Full-Service Brokers
| Category | Examples | Differentiator |
|---|---|---|
| Global Full-Service | Aon, Guy Carpenter, Gallagher Re, Howden Re | Scale, analytics platforms, ILS capabilities |
| Mid-Market Independent | Lockton Re, BMS Re, Acrisure Re, UIB | Agility, senior-level attention, specialty focus |
| Niche / Regional | Holborn, Alliant Re | Deep client relationships, US-focused expertise |
Key Capabilities to Evaluate
- Catastrophe Modeling
- Leading brokers maintain in-house cat modeling teams using vendor models (RMS, AIR, CoreLogic) and proprietary views of risk. Aon's Impact Forecasting unit offers 135+ probabilistic models across 90 territories.
- ILS and Capital Markets
- Brokers with capital markets desks can access alternative capacity through cat bonds, sidecars, and industry loss warranties (ILWs). Howden Re's ILS team has participated in over 50 cat bond transactions.
- Retrocession Access
- For reinsurers seeking to offload peak cat exposure, broker retrocession desks provide access to ILS funds, collateralized reinsurers, and traditional retrocessionaires.
Recent Market Dynamics
The catastrophe reinsurance market has undergone significant consolidation. TigerRisk merged with Howden Re in 2022, while Capsicum was fully absorbed into Gallagher Re. Guy Carpenter is set to rebrand as Marsh Re by 2027. Meanwhile, independent challengers like Lockton Re have grown rapidly — reporting 29% revenue growth in 2024 — by attracting senior talent from larger incumbents and offering a more entrepreneurial broking model.