Casualty sidecars: why long-tail risk has found a new class of capital

Casualty sidecars are moving from niche transactions to an increasingly important part of the reinsurance market.

As institutional investors seek new sources of long-term returns and cedants look to diversify their capital, casualty sidecars are creating opportunities for more strategic partnerships.

In a new article published by Intelligent Insurer during APCIA, Howden Re and Howden Capital Markets & Advisory share their perspectives on what's driving this growth and what it means for insurers, managing general agents (MGAs) and investors.

Carrie Byler, Head of US Casualty at Howden Re, highlights growing interest from cedants:

“The growth of the casualty ILS market is a constant topic with our clients. They may already be engaging with ILS capacity through cat bonds or other alternative vehicles, but are increasingly interested in understanding the casualty impact on both their individual portfolios and on the wider market. We expect that trend to continue into 2027.”

For MGAs, the opportunity extends beyond individual placements. As Kenneth Durbin, Managing Director, Programs at Howden Re, explains:

“Alternative capital is changing how larger MGAs buy reinsurance. Instead of placing programmes one by one, those with scale can now build a single, portfolio-level partnership. That is a more strategic relationship for the MGA, its carrier partners and its investors.”

Mitchell Rosenberg, Co-Head of Global ILS at Howden Capital Markets & Advisory (HCMA), points to a shift in investor thinking:

“We are seeing investor capital moving away from asking whether casualty belongs in their portfolio to asking how they should access it. That is an important evolution. The focus now is on finding the right underwriting partner and building a structure that works for both sides of the capital.”

Together, their perspectives highlight how the convergence of traditional reinsurance and institutional capital is creating new opportunities to build long-term partnerships and more diversified reinsurance programmes.