Insurers Eye $153B Opportunity in U.S. Middle-Market Businesses

Conning's 2025 Middle Market Study highlights a substantial growth opportunity for property and casualty insurers within the middle-market business segment in the U.S., with direct premiums written estimated between $153 billion and $168 billion. Middle-market firms, defined as businesses with 50 to 999 employees and generating $10 million to $1 billion in annual revenue, constitute a diverse group where 73% have fewer than 150 employees but contribute less than half of the segment's total revenue. This segment is increasingly attractive to insurers due to limited prospects in national accounts and high price competition in small commercial business sectors. Insurers have tended to overlook the middle market, but it represents a unique space with elevated risk exposures compared to smaller firms, yet without the sophisticated risk management capabilities common in larger enterprises. This gap indicates a need for insurers to provide tailored risk assessment and coverage solutions. Conning emphasizes the necessity for insurers to deliver highly customized insurance products that reflect the varied complexities of mid-sized businesses to remain competitive. The role of agents and brokers is pivotal in this segment, as they act as frontline risk assessors and information conduits to insurers. Effective engagement with agents and brokers who possess comprehensive business expertise is critical for insurers to accurately evaluate and price the risks inherent to middle-market firms. A strong insurer-agent partnership is therefore fundamental to capitalizing on this opportunity. Middle-market firms, especially those at the upper end of the size and revenue scale, represent significant premium potential. Insurers are encouraged to deepen market penetration strategies targeting these firms to leverage the sizeable premium opportunities they offer. The study suggests that focusing efforts on this segment could diversify insurers' business portfolios and enhance growth prospects in a competitive market environment.