Beyond the Cycle: How Structural Shifts Are Reshaping the Excess Casualty Market
For decades, insurance professionals have framed market conditions in terms of cycles, as in hard markets giving way to soft, and back again. But in today’s excess casualty environment, that framing no longer captures the full picture. Underlying market dynamics now point to structural changes that are expected to persist, rather than the temporary conditions associated with a typical market cycle.
The result is a marketplace where underwriting discipline, attachment strategy and portfolio construction matter more than ever. For risk managers and brokers building coverage towers, understanding these structural shifts has become essential to securing quality protection at sustainable pricing.
“Excess casualty is not simply in another market phase,” said Dawn Brost, SVP Brokerage Excess Casualty at Nationwide E&S Wholesale. “The structure of the market has changed because loss severity, litigation behavior, capital costs, and reinsurance economics have all shifted in a more durable way.”
A Market Shaped by Severity, Litigation and Capital Efficiency

Dawn Brost, SVP Brokerage Excess Casualty, Nationwide E&S Wholesale
The primary forces shaping pricing and capacity today are persistent loss severity, social inflation, reinsurance costs and a sharper focus on capital efficiency. According to Brost, pricing decisions are increasingly tied to where a layer attaches, how much limit is being deployed, the underlying quality of the primary program and the volatility profile of the industry being underwritten.
“We are underwriting that primary program and those underlying carriers and structures more than ever before, including that pricing metric,” Brost said.
Capacity decisions have also become more surgical. Carriers are evaluating class of business, venue, auto exposure, claim history, broker quality and whether the structure supports long-term profitability. A sharper distinction has emerged between supported excess and unsupported excess.
“If the underlying pricing, coverage, or claims posture is not credible, excess markets will either reduce capacity, move attachment, tighten terms, or walk away altogether,” Brost said.
Litigation trends are a major driver behind this discipline. While nuclear verdicts capture headlines, Brost noted that the bigger issue is a steady elevation of settlement values, broader theories of liability and more aggressive plaintiff tactics. Severity continues to outpace what many buyers grew accustomed to over the last decade.
Reinsurance economics act as a governor on capacity and pricing. When the cost of protecting volatility rises, carriers become more selective about layers, classes and geographies. “This doesn’t mean capacity is disappearing,” Brost said. “However, it does mean capacity is more differentiated and more conditional on the structure and quality of risk.”
Building Better Towers from the Ground Up
For clients seeking to navigate this environment, Brost emphasized that the best outcomes start with the primary layer. Brokers should focus on the overall structure of the coverage tower as an integrated risk financing strategy rather than a stack of interchangeable parts.
“Is the primary layer carrying enough of the predictable loss activity so that the excess layers can perform in the way they’re intended?” Brost said. “If the attachment points are too low or if underlying terms are too broad relative to the risk, that gap is going to show up in the form of reduced excess capacity, tougher pricing, or narrower terms.”
Brost recommends clients focus on three priorities when arranging coverage:
- Align retention and limit purchasing with actual severity potential. The primary should manage volatility and frequency, while excess attachment points should reflect where the severity curve may land. Realistic attachment expectations and clear underwriting information lead to better terms.
- Evaluate carrier specialization at every layer. As risks become more complex, the underwriting and claims expertise of each carrier in the tower matters. “We carefully evaluate who is writing the account and whether they have both the underwriting and claims expertise in that specific space,” Brost said. “This ensures that we have confidence that, should coverage be triggered, we’re stacking our tower with the right specialized carriers applicable to that risk.”
- Understand pricing drop-off points. Most coverage towers have a pricing drop-off, but carriers don’t always agree on where it should occur. The first excess layers often remain within the working layer and require pricing strength that matches exposure.
“We don’t want to run the risk of underpricing higher attachment points, thinking we’re in a great spot and the volatility is not there,” Brost said. Nationwide is leaning into claims specialization, actuarial studies and AI tools to determine where pricing should shift.
Brost also cautioned against common misconceptions. More markets quoting a risk doesn’t necessarily mean the market is softening — capacity remains selective, class-specific and conditional. Excess carriers also don’t view layers the same way; where a layer attaches and how it fits the rest of the tower varies enormously by carrier.
“The best way to address these misconceptions is to be transparent about how we think,” Brost said. “We consider attachment quality, underlying adequacy, pricing adequacy, the hazard, the venue, and the portfolio fit.”
Emerging Exposures on the Horizon
Looking ahead, risk managers should be monitoring exposures that are reshaping the casualty landscape. Brost highlighted two areas of particular focus: data centers and artificial intelligence.
Data centers are impacting the marketplace across multiple lines — from property coverage during construction, to first-party property once established, to third-party casualty for ongoing operations. “This emerging risk is affecting our industry quite broadly across all different types of product lines,” Brost said.
AI presents an even more complex challenge, influencing both how insurance business is conducted and how coverage triggers may apply. “Where does cyber liability stop and start, and where does E&O ultimately stop and start with these coverage triggers?” Brost said. Professional lines can also be drawn into the mix.
Addressing these emerging risks requires carriers to evolve their expertise — maintaining deep specialization while remaining adaptable enough to capture new exposures as they develop.
The broader theme is that the pressures shaping today’s market are not cyclical but climbing. Litigation influence, inflation, severity trends and plaintiff strategies for finding gaps in coverage show no signs of decreasing.
“When thinking about our industry from an excess position structure versus cycles, we focus on disciplined capacity, not indiscriminate capacity,” Brost said. “We emphasize capital efficiency through underwriting specialization — specifically, how we’re deploying that capital. It’s not so much about whether capacity is available, but where the capacity is willing to sit in these coverage towers.”
For clients and brokers navigating this environment, the path forward lies in transparent communication, integrated tower strategies and partnerships with carriers committed to sustained participation rather than opportunistic plays. &

