E&S stands for excess and surplus lines, and it is a fast-growing part of the U.S. property and casualty market. The NAIC reports that U.S. surplus lines premium grew 12.2% in 2024 to $131 billion, representing 12% of all U.S. property and casualty premium.
That growth makes E&S increasingly important to retail agents, but the name itself can be confusing. “Excess” and “surplus lines” describe related ideas, with surplus lines doing most of the work in explaining how this market operates.
“Excess” means coverage above another limit
In insurance generally, excess coverage provides limits above a stated amount, usually after an underlying policy or retained amount has been exhausted. It can add capacity when one insurer will not provide the full limit an account needs. Not every E&S policy is excess coverage, however: an E&S insurer can also write the primary property, liability or professional policy.
Surplus lines
Surplus lines insurance is specialized property and casualty coverage written by eligible non-admitted insurers when the needed coverage is not available from the admitted market. “Non-admitted” means the carrier is not licensed as an admitted insurer in the state where the risk is located. It does not mean the carrier is unregulated.
The insurer is regulated in its domiciliary jurisdiction, while the transaction is regulated in the insured’s home state and handled through licensed surplus lines professionals.
The opportunity
Admitted carriers write against filed products, rates and underwriting rules. That framework is efficient when an account fits the product already on the shelf. It becomes restrictive when a risk is unusual, severe, new or changing faster than a standard product can accommodate.
Access to E&S expands a retail brokerage’s placement horizon. Instead of ending the search when admitted appetite runs out, the broker can reach specialist insurers with greater rate-and-form flexibility for a particular account. That can create viable options for unusual operations, difficult loss histories, catastrophe-exposed property and coverage requests that do not fit a standard product.
For the retail broker, that wider horizon can mean retaining a client as its risk changes, competing for accounts that other agencies cannot place and finding coverage that fits the exposure more closely. E&S is not automatically broader or less expensive, and surplus lines is not synonymous with bad risk. It gives the broker more ways to solve the client’s problem when the right structure is not available in the admitted market.
The challenge
The same flexibility that makes a surplus lines placement possible also creates complexity. Policies may differ materially in wording and exclusions, the total price can include taxes and fees, state filing rules apply and guaranty-fund protection generally does not apply if the non-admitted insurer becomes insolvent.
The apparent solution is for the retail brokerage to obtain its own surplus lines license. For most retail brokerages, that is the wrong answer: it turns an occasional E&S need into a standing compliance function without creating the carrier relationships or specialist knowledge needed to place the account.
Requirements vary by state. In California, for example, a resident business entity needs a $50,000 bond and at least one California resident endorsee. For an agency that only encounters E&S accounts periodically, the license can create more burden than useful access.
Enter the wholesale broker
The wholesale broker is built to provide what the retail agency should not have to build for itself: surplus lines licensing, market relationships, placement expertise and the process around them.
The retail agent keeps the insured relationship. The wholesaler takes the specialized E&S work off the agency’s desk and connects the account to markets it could not efficiently reach alone. Our separate guide explains where a retail broker, wholesale broker and MGA differ.
Nomos matches submissions in-house against the carrier relationships most likely to consider them, identifies what is missing and keeps the retail agent informed as the account moves. The goal is to make the E&S market usable: get the risk to a credible market, make the tradeoffs clear and return an answer the agent can use with the insured.
E&S insurance is the part of the commercial market built for exceptions. A good wholesale broker makes that market accessible and understandable. Our guide to what an insurance wholesaler should do for a retail agent explains that service standard in more detail.
