The mental model

A broker is a commercial insurance intermediary representing the buyer's interests in obtaining coverage. The broker's value is some combination of market access, technical expertise, claims advocacy, risk management consulting, and operational support. Compensation comes from commissions paid by carriers, fees paid by insureds, and (sometimes) supplemental compensation tied to volume or profitability of business placed with specific carriers.

The retail-versus-wholesale distinction is functional. Retail brokers face the insured directly; they are the insured's representative in the market. Wholesale brokers face the carrier; they are placed in the chain when the retail broker needs market access to specialty carriers, surplus lines markets, or capacity sources the retail broker does not have direct relationships with. The same firm can sometimes do both functions, particularly at the largest broker firms which operate retail and wholesale practices under different brand names. Understanding the broker side of the market is essential because the broker drives most placement decisions, controls most account information flow, and is the primary counterparty for carriers in the new and renewal cycle.

What retail brokers do

Retail brokers are the insured's primary insurance advisor. They sit between the insured and the carrier and perform a defined set of functions on each placement.

Account management

• Develop the submission package: assembling exposure data, supplementals, claim history, and narrative information.
• Identify markets to approach. For straightforward placements, the retail broker has direct relationships. For specialty or hard-to-place risks, the retail broker engages a wholesale broker.
• Coordinate quotes from carriers and present them to the insured.
• Bind the placement and issue policy documents.
• Service the account through the policy term: certificates, midterm changes, claim assistance.
• Lead the renewal process: marketing strategy, renewal submission, presenting renewal options.

Risk management consulting

Mid-market and large retail brokers offer consulting services beyond placement: claims analysis, loss control, contract review, retention modeling, captive feasibility, M&A insurance due diligence, transactional risk advisory. The largest brokers maintain dedicated practice groups for each of these areas.

Claims advocacy

When a claim arises, the retail broker advocates for the insured with the carrier's claims function. This includes coverage analysis, denial review, settlement coordination, and (in disputed claims) coordination with coverage counsel. Strong claims advocacy is one of the most-cited reasons insureds change brokers.

Specialization

Retail brokers segment by industry, by line of business, or both. A construction-specialty retail broker has deep expertise in builders risk, commercial auto for fleets, surety, and project-specific coverages. A technology-specialty broker focuses on cyber, technology E&O, and intellectual property coverage. Industry specialization is increasingly the primary competitive differentiator at the broker level.

What wholesale brokers do

Wholesale brokers operate between retail brokers and specialty or surplus lines carriers. The wholesale broker provides specialty market access and surplus lines compliance.

Why the wholesale layer exists

• Surplus lines compliance. Surplus lines brokers must hold specific licensing and operate the compliance flow described in Chapter 27. Most retail brokers do not have surplus lines licensing in all 50 states; they engage a wholesale broker who does.
• Specialty market access. Specialty carriers (Lloyd's syndicates, MGAs, specialty London markets, specialty-MGA-driven E&S markets) often deal exclusively with wholesale brokers. The retail broker who needs to access these markets engages a wholesale firm with the relationships.
• Technical expertise. Wholesale brokers focus on specific lines and develop deep expertise. The retail broker on a complex placement leverages the wholesale broker's technical knowledge of the line.
• Underwriting capacity. When a placement requires multiple markets layered or co-leading, the wholesale broker assembles the capacity stack across carriers the retail broker does not directly approach.

The wholesale revenue model

Wholesale brokers are compensated by commission paid by the carrier. The total commission on a placement is split between the retail broker and the wholesale broker, typically with the wholesale broker receiving 10-15% of premium and the retail broker receiving the balance. Splits are negotiable and vary by line and account size.

Specialization within wholesale

Wholesale brokers segment by line of business. Property catastrophe specialists, cyber specialists, environmental specialists, executive risk specialists. The largest wholesale brokers operate multiple line-specific practices under one roof.

The MGA channel

Wholesale brokers often have direct relationships with MGAs (covered in Chapter 25). For programs where an MGA holds binding authority, the wholesale broker can place business directly with the MGA, bypassing both the retail broker and the carrier as separate counterparties. This is common in programs where speed and underwriting agility matter more than market breadth.

The named firms

The brokerage market is heavily consolidated. The named firms drive most large-account placements globally.

The Big Three

• Marsh McLennan (Marsh). Largest global broker by revenue. Strong in large complex risk, captive consulting, and reinsurance (through Guy Carpenter).
• Aon. Second-largest global broker. Particularly strong in reinsurance brokerage, retirement and benefits, and human capital consulting (with Aon Reed Stenhouse acquired through prior consolidation).
• WTW (Willis Towers Watson). Third-largest global broker after the merger of Willis Group and Towers Watson. Strong in reinsurance, retirement consulting, and corporate risk consulting.

The next tier

• Arthur J. Gallagher. Aggressive consolidator that has grown to challenge the top three on commercial accounts. Particularly strong mid-market, retail, and program business.
• Brown & Brown. Strong U.S. retail and wholesale operation, with Hull and Company on the wholesale side.
• Lockton. Largest privately held broker. Distinctive culture, strong producer-owned model, mid-market and large-account focus.
• HUB International, Acrisure, Alliant, USI. Significant U.S.-focused retail brokers, often growing through PE-backed acquisitions.
• NFP, Risk Strategies, BRP Group, IMA Financial. Mid-tier brokers with strong specialty practices.

Wholesale named firms

• Amwins. Largest U.S. wholesale broker by revenue.
• RT Specialty (RT-CFC). Second-largest U.S. wholesale, RT Specialty under Truist (formerly Ryan Specialty before that broader RSG umbrella restructured).
• Ryan Specialty Holdings. Public wholesale and MGA holding company; one of the largest specialty broker and underwriting platforms in the U.S.
• CRC Group, Burns & Wilcox, Worldwide Facilities, BMS U.S., Hull & Company. Other major wholesale firms.

London brokers

• Marsh, Aon, WTW, Gallagher. The U.S. global firms operate substantial London market businesses.
• BMS, Howden, Lockton London, McGill and Partners. Major Lloyd's-focused London brokers with global reach.
• Miller, Price Forbes (Ardonagh), Tysers, Ed Broking. Mid-tier Lloyd's brokers, several with U.S. operations.

Compensation and conflicts

Broker compensation is structurally complex and historically contested.

Standard commission

The base compensation is commission paid by the carrier as a percentage of premium. Commission rates vary by line: lower on commodity property and casualty (typically 10-15%), higher on specialty lines (15-20% or more). The carrier expense load includes the commission, so the insured ultimately pays it through the premium.

Fee arrangements

For large accounts, the broker frequently moves to a fee-based compensation model. The carrier pays a reduced commission (or no commission), and the insured pays the broker a defined fee for services. Fee arrangements provide compensation transparency and align broker incentives toward service rather than volume.

Contingent commissions

Supplemental compensation paid by carriers to brokers based on the volume, growth, and (sometimes) loss ratio of business placed with that carrier. Contingent commissions create alignment between broker and carrier that potentially conflicts with the insured's interests, particularly when the broker is incented to place business with a less competitive carrier to satisfy a contingent commission target.

The Spitzer settlements

In 2004-2005, New York Attorney General Eliot Spitzer pursued the major brokers (Marsh, Aon, Willis, Gallagher) over contingent commission arrangements that were alleged to compromise broker independence. Settlements with the largest firms required disclosure of contingent compensation and (initially) commitments to refrain from accepting contingent commissions on certain business. Over time, those commitments largely expired, and contingent commissions are again widespread, but disclosure requirements have remained.

Other forms of supplemental compensation

• Override commissions. Higher-than-standard commission rates on specific volume or business types.
• Profit-sharing. Commissions tied to the loss ratio of business placed.
• Service fees. Fees paid by carriers for specific services (claims handling, premium accounting, billing).
• Investment income on float. Brokers hold premium funds in trust between collection and remittance to carriers; investment income on these funds is broker income, regulated by state insurance laws.

Binding authority and the broker

For some lines and some accounts, the broker holds binding authority delegated by the carrier. The mechanism is the binding authority agreement, also called an MGA or MGU agreement when the broker assumes underwriting authority.

Binding broker structure

The carrier delegates the authority to bind risks within defined parameters: limits, lines of business, eligible classes, geographic territory, premium thresholds. The binding broker can quote and bind business on the carrier's paper without referring each risk to the carrier's underwriting team.

Why this exists

For high-volume, low-individual-premium business (small commercial property, specific specialty programs, certain personal lines), the carrier's direct underwriting cost would exceed the per-policy economics. Delegating to a binding broker scales the operation. The binding broker is responsible for class adherence, appetite, and pre-bind underwriting; the carrier monitors the book through bordereaux reporting and audit.

Operational considerations

• The binding broker maintains underwriting documentation for every bound risk.
• Premium and claim bordereaux flow to the carrier on a defined cycle.
• Audit-and-oversight provisions allow the carrier to inspect the broker's underwriting practices.
• Limit exceedances or appetite violations are reportable events.

The MGA / wholesale overlap

Many wholesale brokers operate MGA-style binding facilities alongside their non-binding brokerage business. The same firm can place business as a wholesale broker (no binding authority) on one account and as a binding broker on another. The internal segregation and licensing differ; from the retail broker's perspective, the experience can look similar.

London brokers and the placement chain

The London market has its own placement chain conventions, distinct from how a U.S. wholesale placement works.

The producing broker

The retail broker who controls the relationship with the insured is the producing broker. For a U.S.-led placement going to London, the producing broker is typically a U.S. retail or wholesale firm.

The placing broker

The London-based broker who actually places the business at Lloyd's or the company market is the placing broker. For most U.S. business, the producing broker engages a London-based placing broker (often a London affiliate of the same brokerage firm) to walk the slip around the boxes.

The broking process

The placing broker prepares the Market Reform Contract (MRC, the standardized slip format), takes it physically or electronically to the lead underwriter, negotiates terms, and then walks the slip around the following market until full subscription is obtained. Each underwriter signs for a specific percentage participation. The lead underwriter's terms typically govern, with following underwriters taking the lead's pricing and conditions in most cases.

The bureau system

Premium and claims accounting in London goes through Xchanging Insurance Services (now operated by DXC Technology), which handles bureau accounting for Lloyd's syndicates and London company market participants. Brokers and underwriters submit transactional data to the bureau, which manages central settlement, accounting, and claims processing. The bureau system is a substantial operational infrastructure that has no direct U.S. analog.

Consolidation and the brokerage cycle

The brokerage industry has consolidated dramatically over the past two decades, with M&A activity continuing at a high pace.

The drivers

• Scale economics. Larger brokers obtain better terms from carriers, build larger specialty practices, and absorb compliance costs more efficiently.
• Technology investment. Modern brokerage requires substantial technology investment in agency management systems, analytics, claims management, and customer-facing tools. Larger firms can afford the investment.
• PE capital. Private equity has been a substantial buyer of broker firms over the past 15 years, deploying capital in roll-up strategies. Hub International, Acrisure, BroadStreet Partners, Risk Strategies, NFP all have PE ownership.
• Specialty acquisitions. Major brokers acquire specialty firms to add capability (technology, cyber, environmental, transactional risk).

Implications for carriers

Carrier-broker relationships are now negotiated at scale. The largest brokers manage carrier panels, restrict markets that don't perform on their platforms, and aggregate book pricing leverage. A regional carrier may be excluded from major broker panels if it can't demonstrate breadth and capability across multiple lines and territories. The result is increasing market concentration on the carrier side as well, partly driven by broker dynamics.

Implications for insureds

Sophisticated insureds increasingly negotiate the terms of their broker relationship as carefully as the terms of their insurance program. RFP processes for broker selection are common at the large-account level. Insureds compare brokers on team capabilities, service commitments, fee transparency, and dedicated specialty practices.

Where IDP earns its keep

The broker is the carrier's primary information feed. Submission packages, mid-term updates, claim notices, renewal data, certificates, all originate at or pass through the broker. Broker-generated documents follow firm-specific templates that vary across the broker landscape, and the format inconsistency is one of the largest operational drags on carrier underwriting and operations functions.