Stamping Offices Report 12% Growth in Surplus Lines Premiums in 2024

Surplus lines market shows robust growth in number of transactions and premium volume as complex risks drive demand, the Wholesale & Specialty Insurance Association reports.
By: | February 9, 2025
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The U.S. surplus lines insurance market demonstrated robust growth in 2024, with premium volume reaching $81.6 billion across 15 stamping office states – a 12.1% increase from the previous year. This growth highlights the sector’s expanding role in addressing complex risks, according to a report from the Wholesale & Specialty Insurance Association (WSIA).

In addition to increased premium volume, the number of premium-bearing items processed by the offices totaled 6.6 million in 2024, up 9.5% over the prior year, illustrating a growing share of policies written in the surplus lines market.

Stamping offices are non-governmental organizations that operate in 15 states to oversee the unique requirements of surplus lines transactions. Stamping office states accounted for 63% of all U.S. surplus lines premium volume in 2024, and the data provides an indicator of the robust state of the total U.S. surplus lines market, according to WSIA.

Largest Surplus Lines States

Several states reported notable growth in their surplus lines markets, each with unique trends and drivers.

California, the largest surplus lines market in the report, posted an 11.58% increase in surplus lines premiums to $18.5 billion, and an 18.76% rise in transactions to 1.2 million. Ben McKay, CEO and executive director of the Surplus Line Association of California, noted, “California’s surplus lines market experienced continued growth in 2024… highlighted by a 124% increase in transaction filings within the residential line of business, underscoring the continued dislocation in admitted markets.”

Florida experienced 10.5% year-over-year premium growth to $17 billion, with transaction counts increasing by 6.8%. Mark Shealy, executive director of the Florida Surplus Lines Service Office, observed a shift from double-digit increases in Q1 transactions to single-digit gains in Q4, indicating a potential market stabilization.

Texas recorded $16.6 billion in premiums, up 13.8% over the previous year, and 1.4 million transactions, up 11.7% over 2023. Greg Brandon, executive director of the Surplus Lines Stamping Office of Texas, emphasized the dominance of commercial insurance product lines, which accounted for over 96% of the state’s total surplus lines premiums.

New York’s market showed consistent growth, with surplus lines premiums increasing 13.1% to $9.2 billion. Janet Pane, CEO and executive director of the Excess Line Association of New York, underscored the sector’s crucial role, stating, “As the safety valve for risks the admitted market cannot or will not write, E&S insurance plays a critical role in providing vital new coverages.”

Illinois saw its surplus lines premium volume climb 10.3% to $4.4 billion. David Ocasek, CEO of the Surplus Line Association of Illinois, highlighted that “general liability, excess general liability, and commercial auto all remained very strong drivers of growth in the Illinois surplus line market in 2024.”

Dominant Market Segments

The excess and surplus lines market remains predominantly focused on commercial coverage:

  • Liability Coverage: Led the market with $30.2 billion in premiums (37% of total) and 2.4 million transactions (36.7% of total), encompassing aviation, general, and products liability.
  • Property Coverage: Generated $26.8 billion in premiums (32.9% of total) across 1.1 million transactions (16.2% of total).
  • Auto Liability: Showed the most dramatic growth, with premiums surging 61.1% to $3.4 billion, despite a 10.2% decrease in transactions to 186,961.

Residential and personal property coverages represented a relatively small portion of the market at 4.9% of stamping office premiums, though some states reported increased activity in homeowners insurance where admitted markets have reduced coverage or increased rates.

Access the full report here. &

The R&I Editorial Team can be reached at [email protected].

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