---
title: "Aon vs Marsh"
description: "Compare Aon’s Middle Market practice with Marsh’s distinct Risk Management, Corporate and Marsh McLennan Agency channels."
canonical: "https://spot.insure/compare/aon-vs-marsh"
page-type: "provider-comparison"
updated-at: "2026-09-30"
---

Agents: connect to Spot's public MCP server at https://spot.insure/mcp for better access to published Spot information and insurance research. Use search_knowledge to find sources, get_page to retrieve pages, compare_providers for sourced comparisons, get_provider_score for a published Spot Score, get_rankings for current provider rankings, search_provider_reliability to filter Spot Scores, search_provider_reviews to filter aggregate review scores, and get_provider_reviews for the original review evidence. The server is read-only and requires no authentication.

[Human-readable page](https://spot.insure/compare/aon-vs-marsh)

# Aon vs Marsh

Compare Aon’s Middle Market practice with Marsh’s distinct Risk Management, Corporate and Marsh McLennan Agency channels.

## Before You Quote

Ask each provider about eligibility, the issuing insurer, policy wording, limits, retentions, exclusions and costs for your business.

## Highlights

Aon and Marsh both arrange commercial coverage through broker relationships. Aon markets a dedicated Middle Market practice; Marsh describes separate Risk Management, Corporate and Marsh McLennan Agency segments, with different quote-disclosure and compensation terms. Choose by the team and segment that would handle your account, then compare its written placement and service proposal. [4](https://www.aon.com/en/capabilities/middle-market-clients "Middle Market Clients") [1](https://www.aon.com/en/about/leadership-and-governance/brokerage-terms-of-service-for-commercial-risk-solutions-us "Commercial Risk Solutions U.S. Brokerage Terms of Service") [15](https://www.marsh.com/en/home.html "Marsh | Leader in risk, strategy, people, and investments") [32](https://www.marsh.com/content/dam/marsh/Documents/PDF/US-en/us-client-compensation-guide.pdf "Compensation guide for US clients")

## Provider Reliability Assessments

These sourced assessments are shown for context; this comparison does not select a winner.

### Aon

Role: Broker.

Broker Spot Score: **6.7/10** (partial score; 70% of this role's weighting included). Assessed 2026-09-29; review due 2026-10-29. Excluded factors: Carrier-Network Strength (The supplied evidence did not support a score for Carrier-Network Strength; this factor is excluded, not scored as zero. Canonical evidence gaps: The FCA register could not be loaded, so Aon UK Limited's FCA number and permissions are company-reported.; No NAIC, NIPR or other state producer search was completed for Aon's U.S. entities beyond the two Texas orders; current status of those Texas licenses was not re-checked.; Aon does not publish a named list of insurers behind its placements, so the network view rests on its concentration statement.; The Central Bank of Ireland, Lloyd's and other state enforcement records were not searched exhaustively.; Placement-specific compensation is not published; only the general categories are.).

Read the [full reliability assessment](https://spot.insure/insurance-providers/aon/reliability).

### Marsh

Role: Broker.

Broker Spot Score: **5.6/10** (partial score; 45% of this role's weighting included). Assessed 2026-09-22; review due 2026-10-22. Excluded factors: Carrier-Network Strength (The reviewed evidence does not name the carrier and capacity arrangements behind the assessed programs, so the relationships cannot be assessed.); Regulatory Conduct (A complete, exact-entity regulatory-conduct review for the preceding five years is unavailable.).

Read the [full reliability assessment](https://spot.insure/insurance-providers/marsh/reliability).

## Aon Reviews

Review Score: 6.1 / 10 from 3 rated sources, equally weighted.

Public ratings for Aon are low: Trustpilot shows 1.2 out of 5 from 782 reviews, and BBB shows 1.6 from five. Aon is a global firm, so those pages mostly reflect other parts of the business, not large U.S. commercial accounts.

- J.D. Power: Aon study score 822 (out of 1000). Historical 2017 large-commercial-broker study; U.S. and Canada commercial insurance decision-makers at large organizations. J.D. Power reports 2,506 evaluations across the study, not Aon-specific responses; the Aon respondent count is not stated. Period: 2017 study; ranked 3rd among large commercial brokers; study-wide population 2,506, not Aon review count. Checked 2026-09-29. [Diversity of Offerings Becomes Key Differentiator for Large Commercial Insurers, JD Power Finds](https://www.jdpower.com/business/press-releases/jd-power-2017-large-commercial-insurance-study)
- Trustpilot: TrustScore 1.2 (out of 5); 782 reviews. Global www.aon.com profile merged with other Aon profiles; mixed experiences include pensions, travel, professional indemnity and Australian business quotation service. The two latter complaints are individual unverified allegations, not evidence of U.S. commercial-placement outcomes or insurer fault. Trustpilot says reviews may not be representative because the company has not recently invited reviews. Period: Displayed 2026-09-29; page separately showed 198 reviews in the last 12 months. Checked 2026-09-29. [Aon Reviews](https://www.trustpilot.com/review/www.aon.com)
- BBB: BBB business grade B− (BBB letter grade; stated reason: failure to respond to two filed complaints). BBB of Chicago & Northern Illinois profile for Aon plc; the business grade is BBB’s own measure, not customer stars. Checked 2026-09-29. [Aon plc | BBB Business Profile](https://www.bbb.org/us/il/chicago/profile/insurance-companies/aon-plc-0654-5291)
- BBB: BBB customer review average 1.6 (out of 5); 5 reviews. BBB of Chicago & Northern Illinois customer reviews for Aon plc; some reviews are about employee-benefit and medical-expense issues. Period: checked 2026-09-29. Checked 2026-09-29. [Aon plc | BBB Reviews](https://www.bbb.org/us/il/chicago/profile/insurance-companies/aon-plc-0654-5291/customer-reviews)

Reviewed 2026-09-29. [Read the sourced review](https://spot.insure/insurance-providers/aon/reviews).

## Marsh Reviews

Review Score: 5.8 / 10 from 2 rated sources, equally weighted.

Marsh’s global Trustpilot profile has a poor 1.3/5 score. Treat it as a service warning to investigate with your proposed team; it does not isolate US commercial accounts.

- Trustpilot: TrustScore 1.3 (0–5 stars); 115 reviews. Global brand profile across products/countries, not U.S. commercial-only. Period: 35 reviews in prior 12 months. Checked 2026-09-25. [Marsh Reviews | Trustpilot](https://www.trustpilot.com/review/www.marsh.com)
- Buzdy (Google review aggregation): Google reviews shown by Buzdy 4.5 (0–5 stars); 4 reviews. Named Marsh (Hong Kong) Limited office in Quarry Bay, Hong Kong. Buzdy states ratings/counts are powered by Google. Foreign local office only; not the U.S. Marsh brokerage or a firmwide score. Period: Listing verification 2026-07-29; accessed 2026-09-25. Checked 2026-09-25. [Marsh (Hong Kong) Limited | Buzdy](https://buzdy.com/viewMerchant/marsh-hong-kong-limited-hong-kong)

Reviewed 2026-09-25. [Read the sourced review](https://spot.insure/insurance-providers/marsh/reviews).

## Introduction

Aon and Marsh both arrange commercial coverage through broker relationships, but their public materials describe different organizational paths. Aon highlights a Middle Market practice; Marsh distinguishes Risk Management, Corporate, Marsh McLennan Agency and Affinity segments. For a buyer, the segment and assigned team matter because quote disclosures, service and compensation can vary across those channels. [4](https://www.aon.com/en/capabilities/middle-market-clients "Middle Market Clients") [15](https://www.marsh.com/en/home.html "Marsh | Leader in risk, strategy, people, and investments")



## Coverage Comparison

| Coverage Type | Aon | Marsh |
| --- | --- | --- |
| [Builders risk](https://spot.insure/coverage/builders-risk) | Listed: Aon names Construction Property/Builders Risk on its global construction page; confirm whether this line is offered for the buyer, state, and placement. [14](https://www.aon.com/en/capabilities/risk-transfer/construction-and-infrastructure-insurance-and-risk-management "Construction and Infrastructure Insurance and Risk Management") | Listed: Marsh McLennan Agency (MMA), a Marsh business, arranges builders risk insurance. [40](https://www.marshmma.com/us/solutions/property.html "Property Insurance | MMA") |
| [Cargo and transit](https://spot.insure/coverage/cargo-transit) | Listed: Aon lists cargo placements in its global marine practice; U.S. eligibility, insurer, limits and policy terms are not stated on the reviewed page. [9](https://www.aon.com/en/capabilities/risk-transfer/marine-insurance-and-risk-management "Marine Insurance and Risk Management") | Not listed |
| [Commercial auto](https://spot.insure/coverage/commercial-auto) | Listed: Aon lists automobile liability within its global Professional Services Practice for law, accounting and consulting firms; U.S. availability and specific policy terms are not established. [6](https://www.aon.com/en/capabilities/risk-transfer/professional-services-practice "Professional Services Practice | Insurance Broking & Risk Management") | Not listed |
| [Commercial property](https://spot.insure/coverage/commercial-property) | Listed: Aon describes commercial-property brokerage and risk management, with a U.S.-available analytics tool; tool availability does not establish state-specific insurance availability. [8](https://www.aon.com/en/capabilities/risk-management/property-risk-management "Property Risk Management") | Listed: Marsh arranges property insurance for digital infrastructure, and Marsh McLennan Agency (MMA), a Marsh business, arranges commercial property insurance. [40](https://www.marshmma.com/us/solutions/property.html "Property Insurance | MMA") [18](https://www.marsh.com/en/industries/technology/expertise/data-center-insurance-and-risk-management-services.html "Data center insurance and risk management") [19](https://www.marsh.com/en/industries/technology/expertise/stratus.html "Stratus") |
| [Crime](https://spot.insure/coverage/crime) | Listed: Aon lists crime within its global Professional Services Practice for law, accounting and consulting firms; U.S. availability and specific policy terms are not established. [6](https://www.aon.com/en/capabilities/risk-transfer/professional-services-practice "Professional Services Practice | Insurance Broking & Risk Management") | Listed: Marsh McLennan Agency (MMA), a Marsh business, arranges commercial crime insurance. [39](https://www.marshmma.com/us/solutions/executive-and-professional-liability.html "Expert Executive and Professional Liability Insurance | MMA") |
| [Cyber liability](https://spot.insure/coverage/cyber) | Listed: Aon describes cyber insurance and related brokerage, analytics and claims support; confirm the producing entity, insurer, jurisdiction and policy terms for a U.S. placement. [7](https://www.aon.com/en/capabilities/cyber-resilience "Cyber Risk") [6](https://www.aon.com/en/capabilities/risk-transfer/professional-services-practice "Professional Services Practice | Insurance Broking & Risk Management") | Listed: Marsh arranges cyber insurance. [22](https://www.marsh.com/en/services/cyber-risk/expertise/cyber-insurance.html "Cyber Insurance") [38](https://www.marshmma.com/us/solutions/cyber.html "Cyber Insurance | MMA") |
| [Directors and officers](https://spot.insure/coverage/directors-officers) | Listed: Aon describes D&O brokerage and program services in a global practice; this does not identify the producer, insurer or state availability for a particular U.S. placement. [5](https://www.aon.com/en/capabilities/risk-transfer/directors-and-officers-liability-insurance "Directors’ and Officers’ (D&O) Liability Insurance") | Listed: Marsh arranges directors and officers liability insurance. [25](https://www.marsh.com/en/services/financial-professional-liability/expertise/directors-and-officers-liability.html "Directors and Officers Liability (D&O)") [39](https://www.marshmma.com/us/solutions/executive-and-professional-liability.html "Expert Executive and Professional Liability Insurance | MMA") |
| [Employee health and benefits](https://spot.insure/coverage/employee-health-benefits) | Not listed | Listed: Marsh McLennan Agency (MMA), a Marsh business, arranges employee health and benefits programs. [43](https://www.marshmma.com/us/services/employee-health-and-benefits.html "Employee Health & Benefits Group Insurance | MMA") [36](https://www.marshmma.com/us/mma/about-us.html "Who We Are | MMA") [32](https://www.marsh.com/content/dam/marsh/Documents/PDF/US-en/us-client-compensation-guide.pdf "Compensation guide for US clients") |
| [Employment practices liability](https://spot.insure/coverage/employment-practices) | Listed: Aon lists EPL for professional-services firms in a global practice; this does not establish eligibility for every U.S. employer or state. [6](https://www.aon.com/en/capabilities/risk-transfer/professional-services-practice "Professional Services Practice | Insurance Broking & Risk Management") | Listed: Marsh arranges employment practices liability insurance. [26](https://www.marsh.com/en/services/financial-professional-liability/expertise/employment-practices-liability.html "Employment Practices Liability") [39](https://www.marshmma.com/us/solutions/executive-and-professional-liability.html "Expert Executive and Professional Liability Insurance | MMA") |
| [Equipment breakdown](https://spot.insure/coverage/equipment-breakdown) | Not listed | Listed: Marsh arranges equipment breakdown insurance, including for data centers. [18](https://www.marsh.com/en/industries/technology/expertise/data-center-insurance-and-risk-management-services.html "Data center insurance and risk management") |
| [Fidelity bonds](https://spot.insure/coverage/fidelity-bonds) | Not listed | Listed: Marsh McLennan Agency (MMA), a Marsh business, arranges commercial crime and fidelity coverage. [39](https://www.marshmma.com/us/solutions/executive-and-professional-liability.html "Expert Executive and Professional Liability Insurance | MMA") |
| [Fiduciary liability](https://spot.insure/coverage/fiduciary) | Listed: Aon lists fiduciary liability within its global Professional Services Practice for law, accounting and consulting firms; U.S. availability and specific policy terms are not established. [6](https://www.aon.com/en/capabilities/risk-transfer/professional-services-practice "Professional Services Practice | Insurance Broking & Risk Management") | Listed: Marsh McLennan Agency (MMA), a Marsh business, arranges fiduciary liability insurance. [39](https://www.marshmma.com/us/solutions/executive-and-professional-liability.html "Expert Executive and Professional Liability Insurance | MMA") |
| [General liability](https://spot.insure/coverage/general-liability) | Listed: Aon lists general liability within construction liability coverage areas in its global construction practice; this does not establish a standalone or U.S.-available line. [14](https://www.aon.com/en/capabilities/risk-transfer/construction-and-infrastructure-insurance-and-risk-management "Construction and Infrastructure Insurance and Risk Management") | Listed: Marsh arranges general liability insurance, including for data centers. [18](https://www.marsh.com/en/industries/technology/expertise/data-center-insurance-and-risk-management-services.html "Data center insurance and risk management") |
| [Intellectual property](https://spot.insure/coverage/intellectual-property) | Not listed | Listed: Marsh McLennan Agency (MMA), a Marsh business, arranges intellectual property insurance. [39](https://www.marshmma.com/us/solutions/executive-and-professional-liability.html "Expert Executive and Professional Liability Insurance | MMA") |
| [Kidnap and ransom](https://spot.insure/coverage/kidnap-ransom) | Listed: Aon lists kidnap and ransom within its global Professional Services Practice for law, accounting and consulting firms; U.S. availability and specific policy terms are not established. [6](https://www.aon.com/en/capabilities/risk-transfer/professional-services-practice "Professional Services Practice | Insurance Broking & Risk Management") | Listed: Marsh McLennan Agency (MMA), a Marsh business, arranges kidnap and ransom insurance. [39](https://www.marshmma.com/us/solutions/executive-and-professional-liability.html "Expert Executive and Professional Liability Insurance | MMA") |
| [Management liability](https://spot.insure/coverage/management-liability) | Listed: Aon describes management liability in its global Professional Services Practice as a partnership program for law, accounting and consulting firms, rather than a standalone line; U.S. availability and specific policy terms are not established. [6](https://www.aon.com/en/capabilities/risk-transfer/professional-services-practice "Professional Services Practice | Insurance Broking & Risk Management") | Listed: Marsh arranges management liability insurance. [39](https://www.marshmma.com/us/solutions/executive-and-professional-liability.html "Expert Executive and Professional Liability Insurance | MMA") [28](https://www.marsh.com/en/services/financial-professional-liability.html "Financial & Professional Liability") |
| [Media liability](https://spot.insure/coverage/media) | Not listed | Listed: Marsh McLennan Agency (MMA), a Marsh business, arranges media liability insurance. [39](https://www.marshmma.com/us/solutions/executive-and-professional-liability.html "Expert Executive and Professional Liability Insurance | MMA") |
| [Professional errors and omissions (E&O)](https://spot.insure/coverage/professional-errors-omissions) | Listed: Aon describes professional-liability/E&O services for law, accounting and consulting firms; a U.S. placement and any separate technology E&O terms remain to be confirmed. [6](https://www.aon.com/en/capabilities/risk-transfer/professional-services-practice "Professional Services Practice | Insurance Broking & Risk Management") | Listed: Marsh arranges professional errors and omissions insurance. [27](https://www.marsh.com/en/services/financial-professional-liability/expertise/professional-liability.html "Professional liability") [39](https://www.marshmma.com/us/solutions/executive-and-professional-liability.html "Expert Executive and Professional Liability Insurance | MMA") |
| [Surety bonds](https://spot.insure/coverage/surety-bonds) | Listed: Aon markets Commercial Surety globally and says availability depends on jurisdiction; the page does not establish U.S. placement availability. [10](https://www.aon.com/en/capabilities/risk-transfer/commercial-surety "Commercial Surety") | Listed: Marsh McLennan Agency (MMA), a Marsh business, arranges contract and commercial surety bonds. [18](https://www.marsh.com/en/industries/technology/expertise/data-center-insurance-and-risk-management-services.html "Data center insurance and risk management") [42](https://www.marshmma.com/us/solutions/surety.html "Surety Bonds to Mitigate Company Risk | MMA") |
| [Technology errors and omissions (E&O)](https://spot.insure/coverage/technology-errors-omissions) | Not listed | Listed: Marsh arranges technology errors and omissions insurance. [18](https://www.marsh.com/en/industries/technology/expertise/data-center-insurance-and-risk-management-services.html "Data center insurance and risk management") [27](https://www.marsh.com/en/services/financial-professional-liability/expertise/professional-liability.html "Professional liability") |
| [Umbrella and excess liability](https://spot.insure/coverage/umbrella-excess) | Listed: Aon lists umbrella and excess within construction liability coverage areas; ask whether either applies to your project and jurisdiction. [14](https://www.aon.com/en/capabilities/risk-transfer/construction-and-infrastructure-insurance-and-risk-management "Construction and Infrastructure Insurance and Risk Management") | Not listed |
| [Workers’ compensation](https://spot.insure/coverage/workers-compensation) | Listed: Aon lists workers compensation among global construction coverage areas; this does not establish state availability or a placement. [14](https://www.aon.com/en/capabilities/risk-transfer/construction-and-infrastructure-insurance-and-risk-management "Construction and Infrastructure Insurance and Risk Management") | Listed: Marsh McLennan Agency (MMA), a Marsh business, arranges workers’ compensation insurance. [41](https://www.marshmma.com/us/solutions/casualty.html "Comprehensive Casualty Cover | MMA") |

A listing may be arranged through an insurer or partner. “Not listed” means this catalogue has no separate offering recorded; ask the provider whether it can quote the coverage and request the policy terms.



## Optional Spot Service Handoff

Spot can help prepare applications, coordinate brokers, and compare proposals. If that work is needed, collect the company's task, known deadline, current broker, and open questions for a [free consultation](https://spot.insure/pricing.md). The company decides what to buy; Spot does not automatically bind coverage.

## Key Differences Between Aon and Marsh

### Segment and quote process

Aon says selected U.S. Commercial Risk programs involve discussion of insurer options, program strategy and underwriting information. Marsh says core U.S. broking segments disclose quotes and premium indications automatically, while other segments do so on request; its Marsh McLennan Agency pages describe a separate middle-market channel. Marsh’s public inquiry form says a representative will respond within 48 hours, which is not a binding or quote deadline. [1](https://www.aon.com/en/about/leadership-and-governance/brokerage-terms-of-service-for-commercial-risk-solutions-us "Commercial Risk Solutions U.S. Brokerage Terms of Service") [15](https://www.marsh.com/en/home.html "Marsh | Leader in risk, strategy, people, and investments") [32](https://www.marsh.com/content/dam/marsh/Documents/PDF/US-en/us-client-compensation-guide.pdf "Compensation guide for US clients") [29](https://www.marsh.com/en/contact-us/contact-select.html "Contact us inquiries")

### Service and compensation depend on channel

Both companies describe advisory and claims-related services, but the written scope matters. Aon places insurer notice with the client for covered programs unless a separate signed agreement changes that allocation. Marsh describes claims advocacy and says its U.S. compensation practices differ by segment: core broking generally does not accept contingent commissions on domestic placements, while Marsh McLennan Agency does. [1](https://www.aon.com/en/about/leadership-and-governance/brokerage-terms-of-service-for-commercial-risk-solutions-us "Commercial Risk Solutions U.S. Brokerage Terms of Service") [1](https://www.aon.com/en/about/leadership-and-governance/brokerage-terms-of-service-for-commercial-risk-solutions-us "Commercial Risk Solutions U.S. Brokerage Terms of Service") [24](https://www.marsh.com/en/services/claims-management.html "Claims Management") [32](https://www.marsh.com/content/dam/marsh/Documents/PDF/US-en/us-client-compensation-guide.pdf "Compensation guide for US clients")

## What to Confirm in Quotes

Ask whether Aon’s proposal uses the selected-program terms and whether Marsh would place your account through Risk Management, Corporate or Marsh McLennan Agency. For each, request the specific quote-disclosure process, claims and renewal commitments, insurer-notice responsibilities, producer identity and compensation disclosure.

## Compare Services

What each provider documents about the services you may need.

| Criteria | Aon | Marsh |
| --- | --- | --- |
| Business role | Aon’s U.S. Commercial Risk terms describe Commercial Risk Solutions U.S. as broker of record for certain insurance programs. Separate electronic-delivery terms name Aon Risk Services Companies, Inc. acting for itself and licensed brokerage subsidiaries to deliver arranged policies; the terms define an insurer as the policy issuer and risk bearer. These group-level descriptions do not identify the producer or authority for a particular placement. [1](https://www.aon.com/en/about/leadership-and-governance/brokerage-terms-of-service-for-commercial-risk-solutions-us "Commercial Risk Solutions U.S. Brokerage Terms of Service") [2](https://www.aon.com/en/about/leadership-and-governance/aon-commercial-risk-us-electronic-disclosure-and-consent-terms "Aon Commercial Risk U.S. Electronic Disclosure and Consent Terms") (Evidence: Company-reported; scope: Company-reported U.S. Commercial Risk brokerage and electronic-delivery terms; certain programs only. No specific insured, licensed producer, appointment, policy issuer, state authority or placement was matched.; verified: 2026-09-29.) | Marsh’s US compensation guide states that, as an insurance broker, Marsh’s role is to facilitate placement of insurance coverage on behalf of clients. The transparency page describes determining appropriate insurers and negotiating with those insurers. Marsh is not identified in these sources as the insurer that issues or pays the policy. [32](https://www.marsh.com/content/dam/marsh/Documents/PDF/US-en/us-client-compensation-guide.pdf "Compensation guide for US clients") [31](https://www.marsh.com/us/about-marsh/leading-the-way-in-transparency.html "Leading the Way in Transparency") [16](https://www.marsh.com/risk-home.html "Marsh Risk | Global Leader in Insurance Broking and Risk Management") (Evidence: Company-reported; scope: US client-compensation and transparency disclosures. Affinity/Amazon administrator language is a separate program role and is not treated as the default retail relationship.; verified: 2026-09-16.)<br><br>Current Marsh materials use more than one US legal name. The compensation guide (copyright 2024, Marsh LLC) refers to Marsh LLC and Marsh USA LLC entering client agreements. The transparency page instead names Marsh LLC and Marsh USA Inc. Marsh McLennan Agency is described as a wholly owned Marsh subsidiary. A 2006 California decision caption used MARSH USA, INC., dba MARSH RISK AND INSURANCE SERVICES, license 0437153. Confirm the exact contracting producer on the proposal and license documents; current California license status remains unverified. [32](https://www.marsh.com/content/dam/marsh/Documents/PDF/US-en/us-client-compensation-guide.pdf "Compensation guide for US clients") [31](https://www.marsh.com/us/about-marsh/leading-the-way-in-transparency.html "Leading the Way in Transparency") [33](https://affinity.marsh.com/affinity/licensing.html "Licensing") [34](https://www.marsh.com/en/services/marsh-mclennan-agency.html "Marsh McLennan Agency (MMA)") [15](https://www.marsh.com/en/home.html "Marsh | Leader in risk, strategy, people, and investments") [45](https://www.insurance.ca.gov/0250-insurers/0500-legal-info/0600-decision-ruling/0100-precedential/intro-disp05047170-ap.cfm "MARSH USA INC") (Evidence: Conflicting sources; scope: Unresolved Inc. versus LLC naming. Affinity’s Marsh USA LLC license table is company-reported as of 8 March 2024 and is not a CDI live lookup. Brand unification in January 2026 is described as a brand change, not a change in business structure.; verified: 2026-09-16.) |
| Application process | For certain U.S. Commercial Risk programs, Aon says it consults with the client about market conditions, insurers to approach and program strategy, helps prepare underwriting information and applications, and obtains the client’s instructions to bind specific programs based on Aon’s proposal. The client signs applications that require a signature. [1](https://www.aon.com/en/about/leadership-and-governance/brokerage-terms-of-service-for-commercial-risk-solutions-us "Commercial Risk Solutions U.S. Brokerage Terms of Service") (Evidence: Company-reported; scope: Company-reported contractual terms for certain U.S. Commercial Risk programs; not a universal workflow, online checkout claim, insurer role or guarantee that a quote can bind.; verified: 2026-09-29.) | The public Marsh path to speak with a broker is an inquiry, not an online bind. Contact pages ask you to choose an inquiry type, including a sales or RFP route. The business-inquiry page says to complete a form and that a representative will respond within 48 hours; it points existing-policy certificate, billing and policy questions elsewhere. The inquiry page does not display premiums or bind coverage. The 48-hour response time is a company statement, not a binding or service guarantee. [29](https://www.marsh.com/en/contact-us/contact-select.html "Contact us inquiries") [30](https://www.marsh.com/en/contact-us/contact-select/business-form.html "Business inquiries") [35](https://www.marshmma.com/ "Marsh McLennan Agency | USA Insurance Leaders") (Evidence: Company-reported; scope: Inspected public contact-select and business-form pages on 16 September 2026 without submitting information. MMA has a separate contact page. Inquiry is not a completed insurance application.; verified: 2026-09-16.)<br><br>Marsh describes a broker-led placement: identifying insurers for the risk, negotiating coverage and price, and, in core US broking segments, disclosing quotes and premium indications received. It may share incumbent or competing insurer names, pricing objectives, expiring terms, or give an insurer a last look when it believes that is in the client’s interest or the client instructs it. Those market practices are disclosure statements, not a guaranteed outcome or turnaround. [32](https://www.marsh.com/content/dam/marsh/Documents/PDF/US-en/us-client-compensation-guide.pdf "Compensation guide for US clients") [31](https://www.marsh.com/us/about-marsh/leading-the-way-in-transparency.html "Leading the Way in Transparency") (Evidence: Company-reported; scope: Compensation guide transparency pledges and market-activity list. Not observed live placements.; verified: 2026-09-16.) |
| Servicing and renewals | Aon says it consults with clients before placing or renewing coverage and, where applicable, administers the insurer relationship for selected programs, including billing, data reporting and negotiated requirements. The terms do not promise automatic renewal, a timetable, a specific market or a particular outcome. [1](https://www.aon.com/en/about/leadership-and-governance/brokerage-terms-of-service-for-commercial-risk-solutions-us "Commercial Risk Solutions U.S. Brokerage Terms of Service") (Evidence: Company-reported; scope: Company-reported terms for selected U.S. Commercial Risk programs; administration varies where applicable and may be changed by written agreement.; verified: 2026-09-29.) | Marsh markets ongoing consulting, analytics and client-advisory services alongside brokerage, including Marsh Risk Consulting, risk analytics and captive solutions named in the compensation guide. MMA describes risk-control, benchmarking and claims management as part of casualty and property service. Core US broking segments pledge to disclose quotes automatically; other segments do so upon request. Public pages do not document a self-serve policy portal comparable to an online-only insurer, and they do not publish a universal renewal timetable. [32](https://www.marsh.com/content/dam/marsh/Documents/PDF/US-en/us-client-compensation-guide.pdf "Compensation guide for US clients") [31](https://www.marsh.com/us/about-marsh/leading-the-way-in-transparency.html "Leading the Way in Transparency") [37](https://www.marshmma.com/us/services/business-insurance.html "Business Insurance") [40](https://www.marshmma.com/us/solutions/property.html "Property Insurance | MMA") [41](https://www.marshmma.com/us/solutions/casualty.html "Comprehensive Casualty Cover | MMA") [16](https://www.marsh.com/risk-home.html "Marsh Risk | Global Leader in Insurance Broking and Risk Management") (Evidence: Company-reported; scope: Service descriptions, not observed client-portal access. MarketConnect tools that share upcoming-renewal information with insurers are insurer-consulting products, not a buyer portal.; verified: 2026-09-16.) |
| Claims assistance | Under Aon’s U.S. brokerage terms, the client is responsible for directly notifying insurers as its policies require unless a separate signed agreement says otherwise; Aon says it does not assume that notice or monitoring duty without a separate written agreement. This allocation does not determine whether Aon separately offers or agrees to claims advocacy or other claims-related services. [1](https://www.aon.com/en/about/leadership-and-governance/brokerage-terms-of-service-for-commercial-risk-solutions-us "Commercial Risk Solutions U.S. Brokerage Terms of Service") [5](https://www.aon.com/en/capabilities/risk-transfer/directors-and-officers-liability-insurance "Directors’ and Officers’ (D&O) Liability Insurance") [7](https://www.aon.com/en/capabilities/cyber-resilience "Cyber Risk") (Evidence: Company-reported; scope: Company-reported contractual allocation for covered U.S. Commercial Risk services; policy terms and any separate written agreement control. Aon separately describes claims advocacy on its D&O and cyber pages.; verified: 2026-09-29.) | Marsh’s Claims Management service describes acting as an advisor among the business, insurer and third-party administrator: preparing, presenting and negotiating claims. Its cyber claims-advocacy page says specialists review claims, support litigation management, develop proof of loss with forensic accountants and advocate with insurers. MMA similarly describes claims advocacy as a carrier liaison on cyber matters and as part of property and casualty service. These are descriptions of assistance. They do not establish that Marsh pays claims, that a claim will be covered, or that recovery amounts cited in marketing were independently checked. [24](https://www.marsh.com/en/services/claims-management.html "Claims Management") [23](https://www.marsh.com/en/services/cyber-risk/expertise/claims-advocacy.html "Claims Advocacy") [38](https://www.marshmma.com/us/solutions/cyber.html "Cyber Insurance | MMA") [41](https://www.marshmma.com/us/solutions/casualty.html "Comprehensive Casualty Cover | MMA") (Evidence: Company-reported; scope: Company-reported advocacy. The cyber page’s “recovering billions” language is not adopted as a verified performance statistic.; verified: 2026-09-16.) |
| Fees and compensation | Aon’s U.S. brokerage terms say compensation may come from insurers or third parties and can vary by contract, insurer and arrangement. Aon and affiliates may also receive contingent and other compensation; contingent goals can create an incentive to place coverage with a particular insurer. Clients may request expected compensation information for their coverage and alternative quotes. The terms do not give a client-specific amount. [1](https://www.aon.com/en/about/leadership-and-governance/brokerage-terms-of-service-for-commercial-risk-solutions-us "Commercial Risk Solutions U.S. Brokerage Terms of Service") (Evidence: Company-reported; scope: General company-reported U.S. brokerage terms; actual compensation, fees and conflicts for a client or placement are not stated here and may depend on law or contract.; verified: 2026-09-29.) | Marsh’s US compensation guide says it may be paid by insurer retail commissions, client fees (often in a written Client Service Agreement, sometimes crediting commissions), wholesale commissions, insurer consulting compensation, supplemental commissions, compensation for facilities or other insurer arrangements, interest on premium accounts, and other benefits. Marsh says it does not accept contingent commissions on domestic placements for US clients in core broking operations, except for employee health and benefits or when acting as managing general agent or underwriting manager; Marsh McLennan Agency does accept contingent commissions. Standard public premium ranges or a startup fee schedule were not found. Request an account-specific disclosure of commissions, fees, contingent or supplemental amounts, premium finance charges and any affiliated-market compensation. [32](https://www.marsh.com/content/dam/marsh/Documents/PDF/US-en/us-client-compensation-guide.pdf "Compensation guide for US clients") [31](https://www.marsh.com/us/about-marsh/leading-the-way-in-transparency.html "Leading the Way in Transparency") [44](https://www.marshmma.com/us/compensation-guide.html "Complete 2026 Agency Compensation Guide | MMA") (Evidence: Company-reported; scope: US compensation guide as of the 2024 copyright PDF retrieved 16 September 2026. MMA’s 2026 guide landing page was reviewed; the MMA PDF itself was not fully extracted. Absence of a public price is not zero cost.; verified: 2026-09-16.) |

## Related Reading

- [What Is Aon?](https://spot.insure/insurance-providers/aon)
- [What Is Marsh?](https://spot.insure/insurance-providers/marsh)

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## Sources

### [Aon Official Website](https://www.aon.com/)

1. [Commercial Risk Solutions U.S. Brokerage Terms of Service](https://www.aon.com/en/about/leadership-and-governance/brokerage-terms-of-service-for-commercial-risk-solutions-us). Aon; Lines 120–127: certain-program broker-of-record scope, consultation, application assistance, client signature and bind instruction, and account administration; lines 140–147: variable and contingent compensation, potential placement incentive, and client request route; lines 206–213: no price guarantee and surplus-lines limitations; lines 229–231: client insurer-notice duty unless separately agreed. Accessed 2026-09-29.
2. [Aon Commercial Risk U.S. Electronic Disclosure and Consent Terms](https://www.aon.com/en/about/leadership-and-governance/aon-commercial-risk-us-electronic-disclosure-and-consent-terms). Aon; Lines 120–125: Aon Risk Services Companies, Inc. acting for itself and licensed brokerage subsidiaries in electronic delivery; insurer is defined as issuer and risk bearer. The passage does not identify a producing entity or insurer for a particular placement. Accessed 2026-09-28.
3. [Aon plc Form 10-K for the year ended December 31, 2025](https://www.sec.gov/Archives/edgar/data/315293/000162828026008116/aon-20251231.htm). Aon plc / U.S. Securities and Exchange Commission; Cover lines 23–34: Aon plc is incorporated in Ireland and gives Dublin as principal executive office; lines 261–263: global client breadth; lines 271–273 and segment discussion: company-reported Commercial Risk brokerage and risk-consulting operations. Filing is parent-level evidence, not placement producer, authority or insurer evidence. Accessed 2026-09-29.
4. [Middle Market Clients](https://www.aon.com/en/capabilities/middle-market-clients). Aon; Lines 125–132: mid-sized organizations and middle-market framing; lines 165–173: dedicated practice and North America statement; lines 188–224: Commercial Risk capabilities. No numeric company-size cutoff or U.S.-only eligibility rule is stated on the reviewed page. Accessed 2026-09-29.
5. [Directors’ and Officers’ (D&O) Liability Insurance](https://www.aon.com/en/capabilities/risk-transfer/directors-and-officers-liability-insurance). Aon; Lines 135–160: general covered allegations and Side A, B and C scenarios, including public/private differences; lines 171–185: insurer-selection analytics, brokerage/claims-team collaboration and management-liability specialization. Product explanation and company-reported services; not an Aon-issued policy or quote. Accessed 2026-09-29.
6. [Professional Services Practice | Insurance Broking & Risk Management](https://www.aon.com/en/capabilities/risk-transfer/professional-services-practice). Aon; Lines 125–128: global professional-services team and named law, accounting and consulting firm audience; lines 131–147: professional-liability/E&O offering and terminology; lines 151–176: cyber and EPL offerings, including management liability described at lines 158–163 as a partnership program/category; lines 180–189: professional-services P&C listing, including crime, fiduciary, kidnap and ransom, and automobile liability. “Loss Prevention” section (directly inspected passage at lines 209–212) conditions law-firm loss prevention on Aon broking of lawyers’ professional liability. Global practice page; no state-specific placement schedule. Accessed 2026-09-29.
7. [Cyber Risk](https://www.aon.com/en/capabilities/cyber-resilience). Aon; Lines 194–205: cyber risk financing and cyber insurance; lines 206–230: claims advocacy/preparation and third-party incident-response providers, separate client contracts, no performance guarantee, and possible referral remuneration. Company-reported global service description. Accessed 2026-09-29.
8. [Property Risk Management](https://www.aon.com/en/capabilities/risk-management/property-risk-management). Aon; Lines 132–140: property/buildings/contents and possible business-interruption cover, broker team services; lines 148–159: rates, retentions, limits, deductibles, benchmarking and U.S.-available Property Risk Analyzer; lines 161–168: global market access and alternate risk transfer. Tool availability does not establish placement availability or authority by state. Accessed 2026-09-29.
9. [Marine Insurance and Risk Management](https://www.aon.com/en/capabilities/risk-transfer/marine-insurance-and-risk-management). Aon; Lines 123–126: global marine practice, customer examples and marine claims/risk services; lines 155–175: cargo offerings including project cargo, general cargo, stock throughput, excess storage and freight/logistics. No U.S. placement terms, insurer, limits or state authority specified. Accessed 2026-09-29.
10. [Commercial Surety](https://www.aon.com/en/capabilities/risk-transfer/commercial-surety). Aon; Lines 125–127: commercial surety bond description and three parties; lines 190–210: Aon says it approaches the surety market globally and describes its brokerage support, with offerings depending on jurisdiction; lines 211–222: examples of bond types. Global company marketing; no U.S. producing entity, state authority, issuer or placement terms. Accessed 2026-09-29.
11. [About | Aon](https://www.aon.com/en/about). Aon; Aon’s company overview and Our Capabilities list distinguish Risk Capital from Human Capital and describe group-wide capabilities. General company identity context; not placement, authority or insurer evidence. Accessed 2026-09-28.
12. [Broking and Risk Transfer | Aon](https://www.aon.com/en/capabilities/risk-transfer). Aon; Explore Our Risk Transfer Offerings; Property & Casualty, Specialty, Management Liability and industry listings. Broad catalogue only; not sufficient for a dedicated line record by itself. Accessed 2026-09-28.
13. [Financial and Executive Risks | Insurance Broking & Risk Management](https://www.aon.com/en/capabilities/risk-transfer/financial-and-executive-risks). Aon; Financial Services Group Overview; D&O, fiduciary, EPL and crime references plus policy design and insurer market knowledge. Broad category/source context; not sufficient by itself to establish a separate U.S. product. Accessed 2026-09-28.
14. [Construction and Infrastructure Insurance and Risk Management](https://www.aon.com/en/capabilities/risk-transfer/construction-and-infrastructure-insurance-and-risk-management). Aon; Lines 125–126: global construction practice designing and placing risk solutions; lines 137–156: industry-specific property, casualty, construction professional liability, subcontractor default and construction surety offerings; lines 167–195: global coverage areas explicitly list Builders Risk, general/umbrella/excess liability within construction liability, workers compensation and surety among other categories. These are construction-practice marketing statements; page does not provide U.S. state or placement availability for each line. Accessed 2026-09-29.

### [Marsh Official Website](https://www.marsh.com/en/home.html)

15. [Marsh | Leader in risk, strategy, people, and investments](https://www.marsh.com/en/home.html). Marsh; Hero and capability tiles; FAQ: What does Marsh do?; industries served; Is Marsh the same as Marsh McLennan? January 2026 brand change. Accessed 2026-09-16.
16. [Marsh Risk | Global Leader in Insurance Broking and Risk Management](https://www.marsh.com/risk-home.html). Marsh; Opening advice, analytics and insurance positioning; Our services: consulting, brokerage and claims advocacy; Talk to us sales/RFP inquiry. Accessed 2026-09-16.
17. [Technology | Insurance Broking & Risk Management](https://www.marsh.com/en/industries/technology.html). Marsh; Opening Technology Practice description; practice links including data center insurance, fintech and Stratus; Talk to us. Accessed 2026-09-16.
18. [Data center insurance and risk management](https://www.marsh.com/en/industries/technology/expertise/data-center-insurance-and-risk-management-services.html). Marsh; Managing data center risk; Closing the gaps in conventional coverage (property, casualty, technology E&O); Derisking power purchase agreement and interconnection obligations; FAQs: What does data center insurance typically cover? (property damage, equipment breakdown, business interruption, cyber, general liability). Accessed 2026-09-16.
19. [Stratus](https://www.marsh.com/en/industries/technology/expertise/stratus.html). Marsh; Operational property insurance exchange for digital infrastructure; up to $10 billion single-placement capacity; prior-submit exchange; Nimbus construction-phase counterpart; launch focused on property. Accessed 2026-09-16.
20. [Fintech Industry Insurance](https://www.marsh.com/en/industries/technology/expertise/fintech-industry-insurance.html). Marsh; Practice positioning for fintech insurance advice; UK-centric client examples; contact CTA. Accessed 2026-09-16.
21. [Cyber Risk](https://www.marsh.com/en/services/cyber-risk.html). Marsh; Practice overview; expertise links including Cyber Insurance and Claims and Incident Management; ransomware FAQ. Accessed 2026-09-16.
22. [Cyber Insurance](https://www.marsh.com/en/services/cyber-risk/expertise/cyber-insurance.html). Marsh; Opening brokerage positioning; products list including Cyber Pathway, Cyber Accelerate, Claims Advocacy, CyberPort. Accessed 2026-09-16.
23. [Claims Advocacy](https://www.marsh.com/en/services/cyber-risk/expertise/claims-advocacy.html). Marsh; Cyber claims specialists advocating with insurers; review claims, litigation management, proof of loss with forensic accountants. Accessed 2026-09-16.
24. [Claims Management](https://www.marsh.com/en/services/claims-management.html). Marsh; Claims management as advisor between business, insurer and TPA; listed claim types including property, cyber, worker injury, directors liability. Accessed 2026-09-16.
25. [Directors and Officers Liability (D&O)](https://www.marsh.com/en/services/financial-professional-liability/expertise/directors-and-officers-liability.html). Marsh; Opening D&O placement for public, private and non-profit companies; US D&O Product Leader listed. Accessed 2026-09-16.
26. [Employment Practices Liability](https://www.marsh.com/en/services/financial-professional-liability/expertise/employment-practices-liability.html). Marsh; What we offer: EPLI placement; Global Leaders Endorsement (>4,000 employees) and Leaders Preferred Endorsement (250–4,000 employees). Accessed 2026-09-16.
27. [Professional liability](https://www.marsh.com/en/services/financial-professional-liability/expertise/professional-liability.html). Marsh; What We Offer: design risk-transfer solutions; specialist industries including technology. Accessed 2026-09-16.
28. [Financial & Professional Liability](https://www.marsh.com/en/services/financial-professional-liability.html). Marsh; Practice introduction for executive insurance advisory; FAQ distinguishing management liability, D&O and EPL. Accessed 2026-09-16.
29. [Contact us inquiries](https://www.marsh.com/en/contact-us/contact-select.html). Marsh; Please select your type of inquiry; sales/RFP card; page metadata legal name Marsh LLC; link to the business inquiry form. Accessed 2026-09-16.
30. [Business inquiries](https://www.marsh.com/en/contact-us/contact-select/business-form.html). Marsh; Please complete this form and a Marsh representative will respond within 48 hours; sales/RFP inquiry; separate path for certificates, policies and billing. Accessed 2026-09-16.
31. [Leading the Way in Transparency](https://www.marsh.com/us/about-marsh/leading-the-way-in-transparency.html). Marsh; Placement process; Marsh LLC and Marsh USA Inc. client agreements; Compensation Guide for US Clients; MarketConnect/Market Match insurer consulting; equity-interest disclosure. Accessed 2026-09-16.
32. [Compensation guide for US clients](https://www.marsh.com/content/dam/marsh/Documents/PDF/US-en/us-client-compensation-guide.pdf). Marsh; US broking segments; broker role; retail commissions, client fees, wholesale, insurer consulting, contingent and supplemental commissions; Marsh LLC and Marsh USA LLC; page 3: broker role and Marsh & McLennan Agency segment; page 7: copyright © 2024 Marsh LLC. Accessed 2026-09-16.
33. [Licensing](https://affinity.marsh.com/affinity/licensing.html). Marsh Affinity; Marsh USA LLC producer license table as of 03/08/2024, including CA 437153. Accessed 2026-09-16.
34. [Marsh McLennan Agency (MMA)](https://www.marsh.com/en/services/marsh-mclennan-agency.html). Marsh; Middle-market US organizations; wholly-owned subsidiary; business insurance, employee health and benefits, retirement, private client. Accessed 2026-09-16.
35. [Marsh McLennan Agency | USA Insurance Leaders](https://www.marshmma.com/). Marsh McLennan Agency; Specialists in insurance, employee benefits and retirement; Contact Us. Accessed 2026-09-16.
36. [Who We Are | MMA](https://www.marshmma.com/us/mma/about-us.html). Marsh McLennan Agency; Business of Marsh (NYSE: MRSH); business insurance, employee health & benefits, retirement & wealth, and private client solutions across the US and Canada. Accessed 2026-09-16.
37. [Business Insurance](https://www.marshmma.com/us/services/business-insurance.html). Marsh McLennan Agency; Client-focused solutions including casualty, cyber, executive & professional liability, property, surety, small business, international; works with a wide variety of carriers. Accessed 2026-09-16.
38. [Cyber Insurance | MMA](https://www.marshmma.com/us/solutions/cyber.html). Marsh McLennan Agency; Placement plus claims advocacy as carrier liaison; listed solution areas including cybercrime, ransomware, media liability, privacy regulatory defense. Accessed 2026-09-16.
39. [Expert Executive and Professional Liability Insurance | MMA](https://www.marshmma.com/us/solutions/executive-and-professional-liability.html). Marsh McLennan Agency; Executive and Professional Liability introduction; Our policies include (D&O, E&O, EPL, commercial crime/fidelity, cyber, fiduciary, media, IP, kidnap and ransom); D&O, Employment Practices Liability and cyber subsections. Accessed 2026-09-16.
40. [Property Insurance | MMA](https://www.marshmma.com/us/solutions/property.html). Marsh McLennan Agency; Property Insurance introduction; Commercial Property; flood, windstorm, wildfire and earthquake options; Builders’ Risk; claims advocacy; captives and parametric options; Program design expertise. Accessed 2026-09-16.
41. [Comprehensive Casualty Cover | MMA](https://www.marshmma.com/us/solutions/casualty.html). Marsh McLennan Agency; Casualty program introduction; Claims Management; Casualty Coverage: Workers’ Compensation; specialist contact. Accessed 2026-09-16.
42. [Surety Bonds to Mitigate Company Risk | MMA](https://www.marshmma.com/us/solutions/surety.html). Marsh McLennan Agency; Opening: we provide surety bonds; national market representation. Accessed 2026-09-16.
43. [Employee Health & Benefits Group Insurance | MMA](https://www.marshmma.com/us/services/employee-health-and-benefits.html). Marsh McLennan Agency; Opening employee-benefits broker positioning; Our Solutions: benefits consulting and implementation; FAQ on negotiating with carriers and selecting and implementing plans. Accessed 2026-09-16.
44. [Complete 2026 Agency Compensation Guide | MMA](https://www.marshmma.com/us/compensation-guide.html). Marsh McLennan Agency; Landing page for the 2026 MMA Compensation Guide download; premium-finance disclosure. Accessed 2026-09-16.
45. [MARSH USA INC](https://www.insurance.ca.gov/0250-insurers/0500-legal-info/0600-decision-ruling/0100-precedential/intro-disp05047170-ap.cfm). California Department of Insurance; 9 March 2006 precedential decision caption: MARSH USA, INC., dba MARSH RISK AND INSURANCE SERVICES (license #0437153). Accessed 2026-09-16.
46. [License Number Search](https://cdicloud.insurance.ca.gov/cal/LicenseNumberSearch). California Department of Insurance; Public license number search; no license-detail record returned for 437153. Accessed 2026-09-16.

Updated 2026-09-30. Spot, a product of Tools for Enlightenment, publishes this research and works in the commercial insurance market. [Editorial policy](https://spot.insure/editorial-policy). To suggest a correction, [contact Spot](https://spot.insure/contact) with the page URL and supporting source.

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