RenaissanceRe Holdings (RNR) concentration risks

The reinsurer's concentration profile spans three distinct dimensions — distribution, geography, and retrocession — and the combination creates a relatively concentrated risk footprint by disclosed standards. The most prominent exposure is on the distribution side: three brokerage firms, Aon plc, Marsh & McLennan Companies, Inc., and Arthur J. Gallagher, collectively accounted for 81.3% of gross premiums written. This is a high-share, dependency-type exposure, meaning a material portion of premium volume flows through a very small number of intermediaries whose terms, relationships, and competitive priorities are outside the company's direct control. The geographic dimension is medium-share and structural in character: a relatively large percentage of coverage exposures has been concentrated in natural disasters in the U.S. Southeast or West Coast. This reflects where the company chooses to deploy capital rather than reliance on any individual counterparty, and it moves with the frequency and severity of natural catastrophe activity in those regions rather than with any single buyer's behavior. Finally, a medium-share retrocessional exposure exists on the liability side: a large portion of the company's own reinsurance protection is concentrated with a relatively small number of reinsurers. This dependency means that in a large-loss scenario, recovery could be impaired if the retrocession panel itself were stressed. The three exposures — concentrated distribution, geographic peril clustering, and concentrated retrocession — compound each other in a severe catastrophe event, making that scenario the most relevant monitoring point.

For the engine’s reasoning on RNR’s current verdict — including which dimensions drove the score — see the per-dimension breakdown.

Concentration counts reflect items disclosed in each peer’s most recent 10-K; disclosed-size classification uses TrendMatrix’s internal 10-K extraction taxonomy.