Brokers put Hurricane Isaias insured losses in the mid-single-digit billions and see little effect on 1 January renewals

Business Insurance reported on 9 October that reinsurance brokers expected Hurricane Isaias to produce insured losses in the mid-single-digit billions of dollars. Gallagher Re, quoted in that report, said Isaias was the first storm to make a US mainland landfall since Milton struck Florida in 2024. Al Jazeera, citing the National Hurricane Center, reported that Isaias came ashore near Destin, Florida, on 9 October with maximum sustained winds of 105 mph and then became post-tropical over southern Alabama; more than 664,000 customers in Florida and Alabama had no power early on 10 October.

Before landfall, brokers and analysts converged on a similar loss range. Gallagher Re and Marsh Re both projected losses in the mid-single-digit billions. Artemis reported that BMS Group raised its expected range to $4bn to $6bn, from $3bn to $5bn the day before, and said losses should stay below $10bn. Gallagher Re's estimate includes private insurers and claims paid by the National Flood Insurance Program.

The estimates were sensitive to the final path. Marsh Re said small changes in track and intensity would "significantly change loss outcomes": a more westerly track would push losses higher into Mobile Bay, and a more easterly one would reduce them. Twelve Securis, quoted by Artemis, said a stronger outcome similar to Hurricane Opal, with insured losses above $10bn, could not be excluded but was less likely.

On market impact, Gallagher Re said the event is unlikely to influence 1 January renewal discussions in a meaningful way, because reinsurance capital is abundant. BMS said the storm does not seem to affect current capacity materially. Artemis expected outstanding catastrophe bonds to be largely safe from direct losses at this size of event. It said aggregate covers could see their deductibles eroded, which uses up retention but is not in itself a payment, that some parametric arrangements were exposed, and that some losses could reach reinsurance capital through lower layers, quota shares and sidecars.

Exposure counts are not loss figures. Moody's identified 31,659 commercial properties in Alabama, Florida and Mississippi, with a value of $71.8bn, that had a better than even chance of damaging winds. We found no post-landfall estimate from a catastrophe modelling firm at the time of writing; the broker figures above were made before the storm came ashore.