Catastrophe Aggregate Limit Exception in a Growth Push
Northbridge Specialty Insurance writes coastal US property catastrophe cover. Its board-approved risk appetite states that the 1-in-200 aggregate net probable maximum loss (PML) must not exceed 85% of available capital, with a hard ceiling of 95% requiring an explicit board risk committee exception. The current ratio is 82%. The underwriting team proposes a $60m-limit commercial portfolio in coastal Texas with an expected loss ratio of 55% and projected return on equity of 18%; the CRO calculates that writing it would lift the 1-in-200 ratio to 91%. The CEO argues that softening rates elsewhere make the growth essential and that reinsurance can be bought. However, the retro market is hard: excess-of-loss cover for the layer needed costs 2.5 times the modelled expected loss, and two rating agencies have placed the sector on negative outlook. The exception policy allows temporary breaches up to 95% only with a formal risk-reward case, board risk committee approval and a remediation plan. The next committee meeting is in ten days and the submission deadline for the account is in fourteen days.
1. As CRO, set out how you would advise the board risk committee on whether to approve the exception. Address the purpose and integrity of the limit, the quantitative trade-off, and the alternatives available.
Read the worked answer
Start from the limit's purpose: the 85% ceiling exists to protect policyholders and rating agency capital from a 1-in-200 event and to preserve strategic flexibility. A breach to 91% cuts the post-event buffer from 18% to 9% of capital, halving the headroom above the 100% regulatory line before any post-event capital raise. The incremental $60m limit contributes roughly 9 percentage points of PML; the 18% ROE only looks attractive if the cost of that risk is properly charged. At 2.5x expected loss, the retro cover needed to bring the ratio back to 85% would consume much of the projected margin. I would model the risk-adjusted return net of retro and net of the incremental cost of capital, and compare it with the return on the same capacity deployed elsewhere. The exception criteria should be tested: is the breach temporary, is there a clear remediation path, is it within the 95% hard ceiling, and is the risk-reward case positive after all costs? The rating agency negative outlook matters: a 91% ratio could invite a downgrade, raising the cost of capital for the whole book. Alternatives include writing a reduced share (say 40% of the $60m), seeking co-insurance, buying a cat bond or parametric cover, or declining and preserving capacity for better-priced opportunities. My advice would be to decline the full submission, but authorise a reduced participation of no more than $25m with a net PML impact of 3-4 points, subject to committee approval, and to review separately whether the 85% limit remains calibrated to the current cost of capital.
2. If the committee is minded to approve, specify the conditions, monitoring and reporting you would require, and explain how you would prevent the exception becoming a precedent.
Read the worked answer
If approval is given, I would require: (i) a hard cap on net PML at 88%, with automatic cession above that level; (ii) pre-agreed retro or parametric cover placed before binding, with its cost included in the risk-adjusted return; (iii) monthly monitoring against the limit, with escalation triggers at 86% and 87%; (iv) a remediation plan to return below 85% within two quarters through natural run-off or capital action; (v) explicit board risk committee sign-off and disclosure to rating agencies. To prevent precedent, the exception should be labelled one-off under the existing policy, subject to a higher hurdle rate (for example, risk-adjusted return above cost of capital plus 300bps), time-limited, and reported to the board with root cause. I would also separate the decision on this account from the broader question of whether the limit is correctly calibrated. If exceptions recur, the limit is wrong, not the business. Documenting the rationale lets future committees distinguish genuine value from commercial pressure.