Cloud to chaos as cyber aggregation reshapes underwriting agenda

Cyber aggregation risk is no longer a theoretical concern for insurers. It is a growing, systemic exposure testing the limits of underwriting discipline. What once sat in the background has moved firmly into focus, as digital interdependence exposes portfolios to increasingly complex and correlated losses.

For Adelle Gruber (pictured), class underwriter at Brit Insurance, that shift has been gradual but unmistakable. "Cyber aggregation has always been something that has been, theoretically, in the back of people's minds," she said, describing a risk the market long understood but did not fully confront. The turning point came with the move from on-premises infrastructure to cloud-based systems, reshaping both resilience and exposure.