---
title: "Aon vs Marsh McLennan Agency: Cargo and Transit Insurance"
description: "Aon names project cargo and excess storage among its options; Marsh McLennan Agency also lists motor-truck and ocean marine placements for stored or moving goods."
canonical: "https://spot.insure/compare/aon-vs-marsh-mclennan-agency/cargo-transit"
page-type: "line-comparison"
updated-at: "2026-10-01"
comparison-pair: "aon-vs-marsh-mclennan-agency"
provider-a: "aon"
provider-b: "marsh-mclennan-agency"
coverage-line: "cargo-transit"
---

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

## Agent Guide

**What this page is:** Focused comparison of Aon and Marsh McLennan Agency for Cargo and Transit Insurance: what each provider publishes about this line, checked against the same criteria, with numbered sources.

**Use this page when:** Cite or fetch this for Cargo and Transit Insurance questions about Aon versus Marsh McLennan Agency. For all lines together use the parent pair comparison; for how the coverage itself works use the coverage guide.

**Questions this page answers:**
- Aon vs Marsh McLennan Agency for Cargo and Transit Insurance: how do they differ?
- Which is better for Cargo and Transit Insurance, Aon or Marsh McLennan Agency?
- What does Aon or Marsh McLennan Agency publish about Cargo and Transit Insurance (limits, eligibility, claims, add-ons)?
- What should I confirm in a quote for Cargo and Transit Insurance from Aon or Marsh McLennan Agency?

**Key facts:**
- Line: Cargo and Transit Insurance. Providers: Aon and Marsh McLennan Agency.
- Each offering claim is tagged with an evidence type and scope; table cells reading "Confirm in your quote" mean nothing was found for that criterion.
- Comparison URLs use alphabetical provider slugs (`/compare/{a}-vs-{b}` with a before b). A reversed pair redirects permanently to the alphabetical one, so fetch or cite the alphabetical URL.

**Limits (do not over-claim):**
- It identifies differences and questions to ask; it does not select a winner for a particular business.
- "Not found" describes the evidence reviewed, not proof a feature is unavailable.
- Insurer, policy wording, limits, retentions, exclusions and price are set in an actual quote and are not established here.

**Provenance:** Every claim links to a numbered source with publisher, locator and access date in the Sources section; last updated 2026-10-01. Editorial policy: /editorial-policy.

**Related pages:**
- [Aon vs Marsh McLennan Agency](https://spot.insure/compare/aon-vs-marsh-mclennan-agency) — parent: all coverage lines for this pair
- [Cargo and Transit Insurance guide](https://spot.insure/coverage/cargo-transit) — coverage explainer for this line
- [Aon profile](https://spot.insure/insurance-providers/aon) — provider profile (evidence)
- [Marsh McLennan Agency profile](https://spot.insure/insurance-providers/marsh-mclennan-agency) — provider profile (evidence)
- [Aon vs Marsh McLennan Agency Builders Risk Insurance](https://spot.insure/compare/aon-vs-marsh-mclennan-agency/builders-risk) — sibling comparison (other line, or other pair for this line)
- [Aon vs Marsh McLennan Agency Commercial Auto Insurance](https://spot.insure/compare/aon-vs-marsh-mclennan-agency/commercial-auto) — sibling comparison (other line, or other pair for this line)
- [Aon vs Marsh McLennan Agency Commercial Property Insurance](https://spot.insure/compare/aon-vs-marsh-mclennan-agency/commercial-property) — sibling comparison (other line, or other pair for this line)
- [Aon vs Marsh McLennan Agency Crime Insurance](https://spot.insure/compare/aon-vs-marsh-mclennan-agency/crime) — sibling comparison (other line, or other pair for this line)
- [Aon vs Marsh McLennan Agency Cyber Insurance](https://spot.insure/compare/aon-vs-marsh-mclennan-agency/cyber) — sibling comparison (other line, or other pair for this line)
- [Aon vs Marsh McLennan Agency D&O Insurance](https://spot.insure/compare/aon-vs-marsh-mclennan-agency/directors-officers) — sibling comparison (other line, or other pair for this line)
- [Aon vs Marsh McLennan Agency Employment Practices Liability Insurance](https://spot.insure/compare/aon-vs-marsh-mclennan-agency/employment-practices) — sibling comparison (other line, or other pair for this line)
- [Aon vs Marsh McLennan Agency Fiduciary Liability Insurance](https://spot.insure/compare/aon-vs-marsh-mclennan-agency/fiduciary) — sibling comparison (other line, or other pair for this line)
- [Aon vs Marsh McLennan Agency General Liability Insurance](https://spot.insure/compare/aon-vs-marsh-mclennan-agency/general-liability) — sibling comparison (other line, or other pair for this line)
- [Aon vs Marsh McLennan Agency Kidnap and Ransom Insurance](https://spot.insure/compare/aon-vs-marsh-mclennan-agency/kidnap-ransom) — sibling comparison (other line, or other pair for this line)
- [Aon vs Marsh McLennan Agency Professional Liability (E&O) Insurance](https://spot.insure/compare/aon-vs-marsh-mclennan-agency/professional-errors-omissions) — sibling comparison (other line, or other pair for this line)
- [Aon vs Marsh McLennan Agency Surety Bonds](https://spot.insure/compare/aon-vs-marsh-mclennan-agency/surety-bonds) — sibling comparison (other line, or other pair for this line)
- [Aon vs Marsh McLennan Agency Workers’ Compensation Insurance](https://spot.insure/compare/aon-vs-marsh-mclennan-agency/workers-compensation) — sibling comparison (other line, or other pair for this line)
- [AIG vs Aon Cargo and Transit Insurance](https://spot.insure/compare/aig-vs-aon/cargo-transit) — sibling comparison (other line, or other pair for this line)
- [AIG vs Marsh McLennan Agency Cargo and Transit Insurance](https://spot.insure/compare/aig-vs-marsh-mclennan-agency/cargo-transit) — sibling comparison (other line, or other pair for this line)
- [Alliance Risk vs Aon Cargo and Transit Insurance](https://spot.insure/compare/alliance-risk-vs-aon/cargo-transit) — sibling comparison (other line, or other pair for this line)
- [Alliance Risk vs Marsh McLennan Agency Cargo and Transit Insurance](https://spot.insure/compare/alliance-risk-vs-marsh-mclennan-agency/cargo-transit) — sibling comparison (other line, or other pair for this line)
- [Amelia Risk vs Aon Cargo and Transit Insurance](https://spot.insure/compare/amelia-risk-vs-aon/cargo-transit) — sibling comparison (other line, or other pair for this line)
- [Amelia Risk vs Marsh McLennan Agency Cargo and Transit Insurance](https://spot.insure/compare/amelia-risk-vs-marsh-mclennan-agency/cargo-transit) — sibling comparison (other line, or other pair for this line)

# Aon vs Marsh McLennan Agency: How Do They Compare for Cargo and Transit Insurance?

Aon names project cargo and excess storage among its options; Marsh McLennan Agency also lists motor-truck and ocean marine placements for stored or moving goods.

## How to Use the Aon vs Marsh McLennan Agency Cargo and Transit Insurance Comparison

Use this comparison to evaluate Aon and Marsh McLennan Agency for Cargo and Transit Insurance against the same documented criteria. It identifies differences and questions to confirm; it does not select a winner for a particular business. Offering claims are what each provider publishes about this line unless marked otherwise. “Not found” describes the evidence reviewed, not proof that a feature is unavailable. Confirm the insurer, policy wording, limits, retentions, exclusions and cost in an actual quote.

## Aon vs Marsh McLennan Agency Cargo and Transit Insurance Summary

Aon lists General Cargo, Excess Storage, Stock Throughput, and Project Cargo/Marine Delay in Start-Up. Marsh McLennan Agency describes cargo stock-throughput, inland transit, motor-truck cargo, and ocean marine options. [3](https://www.aon.com/en/capabilities/risk-transfer/cargo-insurance "Cargo Insurance") [6](https://www.marshmma.com/us/solutions/cargo-theft-prevention.html "Cargo Insurance | MMA")

## What Is Aon?

Aon’s U.S. Commercial Risk terms describe brokerage for certain insurance programs, while its Middle Market page describes a dedicated practice for mid-sized organizations across North America. The public materials reviewed do not identify the licensed producer or insurer for a particular placement. Ask which entity will produce each line and which insurer will issue the policy; request jurisdiction details for the proposed placement and ask how compensation and claim notice work for your account. [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/capabilities/middle-market-clients "Middle Market Clients")

[Aon profile](https://spot.insure/insurance-providers/aon)

## What Is Marsh McLennan Agency?

Marsh McLennan Agency provides business insurance and employee health and benefits, alongside retirement, wealth, and private-client services across the United States and Canada. Its US small-business page lists six common coverage types and directs buyers to request a personalized quote by phone; the insurer and terms for a specific placement must be confirmed in the proposal. [4](https://www.marshmma.com/us/mma/about-us.html "Who We Are") [5](https://www.marshmma.com/us/solutions/small-business.html "Small Business Insurance Solutions")

[Marsh McLennan Agency profile](https://spot.insure/insurance-providers/marsh-mclennan-agency)

## What Is Cargo and Transit Insurance?

Cargo coverage fits a shipper protecting goods it owns or a carrier responsible for another party’s goods. The quote needs to match who bears the loss, the shipment route and storage stops. [7](https://www.insurance.ca.gov/01-consumers/105-type/95-guides/09-comm/commercialguide.cfm "Commercial Insurance Guide") [8](https://www.trade.gov/shipping-options "Shipping Options") [9](https://www.trade.gov/special-documents "Special Documents") [10](https://www.nationalunity.com/National/MotorTruckCargoLiability.pdf "Motor Truck Cargo Legal Liability Coverage")

## What Are the Key Differences Between Aon and Marsh McLennan Agency Cargo and Transit Insurance?

### Named Cargo Options

Aon’s cargo page names General Cargo, Excess Storage, Stock Throughput, and Project Cargo/Marine Delay in Start-Up. Marsh McLennan Agency’s overview names stock throughput, inland transit, motor-truck cargo, and ocean marine for goods in storage or transit. A business with both truck and ocean movements can use the MMA list to ask how the placements divide, while Aon’s named project-cargo option raises a separate question about construction shipments. Neither overview specifies the policy wording or which option fits a specific route. [3](https://www.aon.com/en/capabilities/risk-transfer/cargo-insurance "Cargo Insurance") [6](https://www.marshmma.com/us/solutions/cargo-theft-prevention.html "Cargo Insurance | MMA")

### Goods at Rest and in Motion

Marsh McLennan Agency lists stock throughput, inland transit, motor-truck cargo, and ocean marine for goods in storage or transit. Aon describes cargo during loading, unloading, storage, and transit, with Excess Storage and Project Cargo/Marine Delay among its options. A business moving inventory from warehouse to customer can use these named categories to test whether one placement covers each handoff; the offerings are descriptions, not policy wording. Ask for the locations, transit legs, and selected forms to be shown together in the proposal. [6](https://www.marshmma.com/us/solutions/cargo-theft-prevention.html "Cargo Insurance | MMA") [3](https://www.aon.com/en/capabilities/risk-transfer/cargo-insurance "Cargo Insurance")

## What Should You Confirm in Aon and Marsh McLennan Agency Cargo and Transit Insurance Quotes?

- Which MMA policy or policies would cover ocean, motor-truck, inland, and stock-throughput exposures, and what Aon form covers the same routes? [3](https://www.aon.com/en/capabilities/risk-transfer/cargo-insurance "Cargo Insurance") [6](https://www.marshmma.com/us/solutions/cargo-theft-prevention.html "Cargo Insurance | MMA")
- Which insurer and policy forms cover the same stock values at each warehouse and during each inland or ocean leg? [3](https://www.aon.com/en/capabilities/risk-transfer/cargo-insurance "Cargo Insurance") [6](https://www.marshmma.com/us/solutions/cargo-theft-prevention.html "Cargo Insurance | MMA")

## Aon vs Marsh McLennan Agency Cargo and Transit Insurance Compared

| Criteria | Aon Cargo and Transit brokerage and risk-advisory offering | Marsh McLennan Agency cargo transit (official overview) |
| --- | --- | --- |
| Role in This Line | Aon states it offers cargo insurance solutions and describes its role as cargo broker. The page does not name the carrier that would insure a particular shipment or account. [3](https://www.aon.com/en/capabilities/risk-transfer/cargo-insurance "Cargo Insurance") (Evidence: Company-reported; scope: Aon’s official global product/capability page. The statement is limited to Aon’s marketing of brokerage or advisory services, not policy issuance..) | Marsh McLennan Agency describes arranging cargo transit for the audience stated on the cited product page. [6](https://www.marshmma.com/us/solutions/cargo-theft-prevention.html "Cargo Insurance | MMA") (Evidence: Company-reported; scope: cargo transit marketed by marsh-mclennan-agency; scope is limited to the cited official product overview and described audience. This is not a policy form or a universal eligibility statement..) |
| Issuing Insurer | The reviewed page does not identify the insurer or the legal producing entity for a specific placement. Ask Aon to identify both for the quoted risk. [3](https://www.aon.com/en/capabilities/risk-transfer/cargo-insurance "Cargo Insurance") (Evidence: Not found in reviewed sources; scope: Aon’s global product/capability page reviewed 2026-09-30; no buyer quote, binder or policy was reviewed. This does not establish that no insurer or producing entity is available..) | Confirm in your quote. |
| Who It’s For | Aon addresses businesses across industries that move raw materials, components, finished goods and appliances by road, rail, sea or air, domestically and internationally. [3](https://www.aon.com/en/capabilities/risk-transfer/cargo-insurance "Cargo Insurance") (Evidence: Company-reported; scope: Audience stated by Aon on its global capability page; this does not establish a specific applicant’s eligibility or placement availability by U.S. state..) | Businesses storing or transporting goods; source discusses domestic and international supply chains. [6](https://www.marshmma.com/us/solutions/cargo-theft-prevention.html "Cargo Insurance | MMA") (Evidence: Company-reported; scope: cargo transit marketed by marsh-mclennan-agency; scope is limited to the cited official product overview and described audience. This is not a policy form or a universal eligibility statement..) |
| Coverage Features | Aon describes cargo insurance for physical loss or damage to goods during transportation and describes goods as protected during loading, unloading, storage and transit. Its listed options include General Cargo, Excess Storage, Stock Throughput and Project Cargo/Marine Delay in Start-Up. These are Aon’s product descriptions, not a guarantee that a buyer’s policy includes every category or peril. [3](https://www.aon.com/en/capabilities/risk-transfer/cargo-insurance "Cargo Insurance") (Evidence: Company-reported; scope: Aon’s broker-authored explanation of the insurance line. It does not establish an individual insured’s policy entitlement; the insurer’s form, endorsements and declarations control..) | The cited product page describes cargo stock-throughput, inland transit, motor-truck cargo, and ocean marine options for goods in storage or transit. Marketing description only; actual coverage, exclusions, conditions, limits, and availability depend on the issued policy and jurisdiction. [6](https://www.marshmma.com/us/solutions/cargo-theft-prevention.html "Cargo Insurance | MMA") (Evidence: Company-reported; scope: cargo transit marketed by marsh-mclennan-agency; scope is limited to the cited official product overview and described audience. This is not a policy form or a universal eligibility statement..) |
| Limits and Retentions | The reviewed page does not state a standard buyer-specific limit, retention or deductible for this placement. Confirm amounts, sublimits and conditions in the quote and issued policy. [3](https://www.aon.com/en/capabilities/risk-transfer/cargo-insurance "Cargo Insurance") (Evidence: Not publicly disclosed; scope: Aon’s global product/capability page reviewed 2026-09-30; no buyer quote or policy form was reviewed..) | The cited overview does not set a universal limit or retention for this line. Ask for the proposed policy form, limits, retentions, exclusions, and conditions in the quote. [6](https://www.marshmma.com/us/solutions/cargo-theft-prevention.html "Cargo Insurance | MMA") (Evidence: Not publicly disclosed; scope: Only the cited marketing page was reviewed for published limit and retention information; no policy-form entitlement is inferred..) |
| Risk Services | Aon describes cargo broking, risk consulting, claims management and a global network coordinating local expertise. These are brokerage and advisory services, not the insurer’s claim decision or a guarantee of recovery. [3](https://www.aon.com/en/capabilities/risk-transfer/cargo-insurance "Cargo Insurance") (Evidence: Company-reported; scope: Company-reported brokerage and advisory services. Account-specific service terms are not stated..) | Confirm in your quote. |
| How to Apply | Confirm in your quote. | The page invites organizations to contact a Marsh McLennan Agency adviser or specialist to discuss placement. The page does not establish a quote, bind, or coverage-effective timeline. [6](https://www.marshmma.com/us/solutions/cargo-theft-prevention.html "Cargo Insurance | MMA") (Evidence: Company-reported; scope: cargo transit marketed by marsh-mclennan-agency; scope is limited to the cited official product overview and described audience. This is not a policy form or a universal eligibility statement..) |

## Related Pages for Aon vs Marsh McLennan Agency Cargo and Transit

- [Aon vs Marsh McLennan Agency](https://spot.insure/compare/aon-vs-marsh-mclennan-agency): all coverage lines, business roles, service and claims.
- [What Is Cargo and Transit Insurance?](https://spot.insure/coverage/cargo-transit): Cargo coverage protects your financial interest in goods during transit; ownership, route, storage and late-delivery terms shape what the policy addresses.
- [Aon vs Marsh McLennan Agency Builders Risk Insurance](https://spot.insure/compare/aon-vs-marsh-mclennan-agency/builders-risk)
- [Aon vs Marsh McLennan Agency Commercial Auto Insurance](https://spot.insure/compare/aon-vs-marsh-mclennan-agency/commercial-auto)
- [Aon vs Marsh McLennan Agency Commercial Property Insurance](https://spot.insure/compare/aon-vs-marsh-mclennan-agency/commercial-property)
- [Aon vs Marsh McLennan Agency Crime Insurance](https://spot.insure/compare/aon-vs-marsh-mclennan-agency/crime)
- [Aon vs Marsh McLennan Agency Cyber Insurance](https://spot.insure/compare/aon-vs-marsh-mclennan-agency/cyber)
- [Aon vs Marsh McLennan Agency D&O Insurance](https://spot.insure/compare/aon-vs-marsh-mclennan-agency/directors-officers)
- [Aon vs Marsh McLennan Agency Employment Practices Liability Insurance](https://spot.insure/compare/aon-vs-marsh-mclennan-agency/employment-practices)
- [Aon vs Marsh McLennan Agency Fiduciary Liability Insurance](https://spot.insure/compare/aon-vs-marsh-mclennan-agency/fiduciary)
- [Aon vs Marsh McLennan Agency General Liability Insurance](https://spot.insure/compare/aon-vs-marsh-mclennan-agency/general-liability)
- [Aon vs Marsh McLennan Agency Kidnap and Ransom Insurance](https://spot.insure/compare/aon-vs-marsh-mclennan-agency/kidnap-ransom)
- [Aon vs Marsh McLennan Agency Professional Liability (E&O) Insurance](https://spot.insure/compare/aon-vs-marsh-mclennan-agency/professional-errors-omissions)
- [Aon vs Marsh McLennan Agency Surety Bonds](https://spot.insure/compare/aon-vs-marsh-mclennan-agency/surety-bonds)
- [Aon vs Marsh McLennan Agency Workers’ Compensation Insurance](https://spot.insure/compare/aon-vs-marsh-mclennan-agency/workers-compensation)
- [AIG vs Aon Cargo and Transit Insurance](https://spot.insure/compare/aig-vs-aon/cargo-transit)
- [AIG vs Marsh McLennan Agency Cargo and Transit Insurance](https://spot.insure/compare/aig-vs-marsh-mclennan-agency/cargo-transit)
- [Alliance Risk vs Aon Cargo and Transit Insurance](https://spot.insure/compare/alliance-risk-vs-aon/cargo-transit)
- [Alliance Risk vs Marsh McLennan Agency Cargo and Transit Insurance](https://spot.insure/compare/alliance-risk-vs-marsh-mclennan-agency/cargo-transit)
- [Amelia Risk vs Aon Cargo and Transit Insurance](https://spot.insure/compare/amelia-risk-vs-aon/cargo-transit)
- [Amelia Risk vs Marsh McLennan Agency Cargo and Transit Insurance](https://spot.insure/compare/amelia-risk-vs-marsh-mclennan-agency/cargo-transit)

## Sources for Aon vs Marsh McLennan Agency Cargo and Transit Insurance

### Sources About Aon

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. [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.
3. [Cargo Insurance](https://www.aon.com/en/capabilities/risk-transfer/cargo-insurance). Aon; Cargo insurance definition and transport scope, coverage examples including loading, unloading and storage, lines 123–175; broking, risk consulting, claims management and global cargo network services in ‘How Aon Can Help’; talk-to-team link at top.. Accessed 2026-09-30.

### Sources About Marsh McLennan Agency

4. [Who We Are](https://www.marshmma.com/us/mma/about-us.html). Marsh McLennan Agency; Lines 193-195: ‘a business of Marsh’ and company-listed service lines across US and Canada. This does not establish the legal entity for an account, corporate ownership chart, or insurer role.. Accessed 2026-09-29.
5. [Small Business Insurance Solutions](https://www.marshmma.com/us/solutions/small-business.html). Marsh McLennan Agency; Lines 205-207: small-business audience and call invitation; lines 224-249 list six coverage categories and short descriptions; line 264 is an embedded form whose function is not stated. No form submitted.. Accessed 2026-09-29.
6. [Cargo Insurance | MMA](https://www.marshmma.com/us/solutions/cargo-theft-prevention.html). Marsh McLennan Agency; Cargo insurance coverage; cargo stock throughput, inland transit, motor truck cargo, and ocean marine sections.. Accessed 2026-09-30.

### Sources for the Cargo and Transit Insurance Guide

7. [Commercial Insurance Guide](https://www.insurance.ca.gov/01-consumers/105-type/95-guides/09-comm/commercialguide.cfm). California Department of Insurance; Commercial Property; Inland Marine; What Should I Expect from a Broker-Agent. Accessed 2026-09-16.
8. [Shipping Options](https://www.trade.gov/shipping-options). International Trade Administration, U.S. Department of Commerce; Export Shipping Basics; Tips on International Shipping from U.S.; Working with Freight Forwarders. Accessed 2026-09-16.
9. [Special Documents](https://www.trade.gov/special-documents). International Trade Administration, U.S. Department of Commerce; Insurance Certificate bullet. Accessed 2026-09-16.
10. [Motor Truck Cargo Legal Liability Coverage](https://www.nationalunity.com/National/MotorTruckCargoLiability.pdf). American Association of Insurance Services, Inc.; hosted by National Unity; Coverage and Property Covered pp.1–2; Perils Excluded pp.6–7; Valuation p.8; How Much We Pay p.9; Transit definition p.13. Accessed 2026-09-16.

Updated 2026-10-01. Spot, a product of Tools for Enlightenment, publishes this research and works in the commercial insurance market. The comparison applies the same criteria to both providers. [Editorial policy](https://spot.insure/editorial-policy). To suggest a correction, [contact Spot](https://spot.insure/contact) with the page URL and supporting source.

## Aon Review Scores for 2026

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 McLennan Agency Review Scores for 2026

Review Score: 8.2 / 10 from 2 rated sources, equally weighted.

There are almost no public customer reviews of Marsh McLennan Agency (MMA). Trustpilot shows 3.2 out of 5, but from a single review, and BBB shows an A grade with four complaints closed in three years.

- Trustpilot: TrustScore 3.2 (out of 5); 1 reviews. Trustpilot profile for marshmma.com, MMA's own domain. Unclaimed; MMA has not invited reviews. Period: checked 2026-09-29. Checked 2026-09-29. [marshmma.com Trustpilot profile](https://www.trustpilot.com/review/marshmma.com)
- Trustpilot: TrustScore (Marsh brand) 1.3 (out of 5); 115 reviews. Trustpilot page for marsh.com, the global Marsh brand (mostly individual and non-US customers). This is a different entity from MMA. Period: checked 2026-09-29. Checked 2026-09-29. [Marsh Reviews](https://www.trustpilot.com/review/www.marsh.com)
- BBB: BBB business grade A. BBB San Diego-area profile for Marsh & McLennan Agency LLC (accredited). MMA has separate BBB profiles per office; Dayton and Schaumburg both show A+. Checked 2026-09-29. [Marsh & McLennan Agency LLC (San Diego) BBB](https://www.bbb.org/us/ca/san-diego/profile/insurance-services-office/marsh-mclennan-agency-llc-1126-3000103)
- BBB: Complaints 4. Same San Diego-area profile; zero customer reviews. No client-count denominator. Period: closed in the last three years (checked 2026-09-29). Checked 2026-09-29. [Marsh & McLennan Agency LLC — BBB Complaints](https://www.bbb.org/us/ca/san-diego/profile/insurance-services-office/marsh-mclennan-agency-llc-1126-3000103/complaints); [Marsh & McLennan Agency LLC — BBB Reviews](https://www.bbb.org/us/ca/san-diego/profile/insurance-services-office/marsh-mclennan-agency-llc-1126-3000103/customer-reviews)

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

## Agent and Developer Resources

- [Markdown page](https://spot.insure/compare/aon-vs-marsh-mclennan-agency/cargo-transit.md)
- [Developer resources](https://spot.insure/developers)
- [Public MCP server](https://spot.insure/mcp)
- [MCP server manifest](https://spot.insure/server.json)
- [OpenAPI description](https://spot.insure/openapi.json)
- [Public page index](https://spot.insure/llms.txt)