---
title: "Aon vs Marsh: Crime Insurance"
description: "Aon identifies professional-service firms for its crime practice, while Marsh lists employee, third-party and cyber-enabled fraud exposures and complex placement experience."
canonical: "https://spot.insure/compare/aon-vs-marsh/crime"
page-type: "line-comparison"
updated-at: "2026-09-30"
comparison-pair: "aon-vs-marsh"
provider-a: "aon"
provider-b: "marsh"
coverage-line: "crime"
---

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/crime)

## Agent Guide

**What this page is:** Focused comparison of Aon and Marsh for Crime 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 Crime Insurance questions about Aon versus Marsh. 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 for Crime Insurance: how do they differ?
- Which is better for Crime Insurance, Aon or Marsh?
- What does Aon or Marsh publish about Crime Insurance (limits, eligibility, claims, add-ons)?
- What should I confirm in a quote for Crime Insurance from Aon or Marsh?

**Key facts:**
- Line: Crime Insurance. Providers: Aon and Marsh.
- 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 2026-09-30. Editorial policy: /editorial-policy.

**Related pages:**
- [Aon vs Marsh](https://spot.insure/compare/aon-vs-marsh) — parent: all coverage lines for this pair
- [Crime Insurance guide](https://spot.insure/coverage/crime) — coverage explainer for this line
- [Aon profile](https://spot.insure/insurance-providers/aon) — provider profile (evidence)
- [Marsh profile](https://spot.insure/insurance-providers/marsh) — provider profile (evidence)
- [Aon vs Marsh Commercial Property Insurance](https://spot.insure/compare/aon-vs-marsh/commercial-property) — sibling comparison (other line, or other pair for this line)
- [Aon vs Marsh Cyber Insurance](https://spot.insure/compare/aon-vs-marsh/cyber) — sibling comparison (other line, or other pair for this line)
- [Aon vs Marsh D&O Insurance](https://spot.insure/compare/aon-vs-marsh/directors-officers) — sibling comparison (other line, or other pair for this line)
- [Aon vs Marsh Employment Practices Liability Insurance](https://spot.insure/compare/aon-vs-marsh/employment-practices) — sibling comparison (other line, or other pair for this line)
- [Aon vs Marsh Fiduciary Liability Insurance](https://spot.insure/compare/aon-vs-marsh/fiduciary) — sibling comparison (other line, or other pair for this line)
- [Aon vs Marsh Kidnap and Ransom Insurance](https://spot.insure/compare/aon-vs-marsh/kidnap-ransom) — sibling comparison (other line, or other pair for this line)
- [Aon vs Marsh Management Liability Insurance](https://spot.insure/compare/aon-vs-marsh/management-liability) — sibling comparison (other line, or other pair for this line)
- [Aon vs Marsh Professional Liability (E&O) Insurance](https://spot.insure/compare/aon-vs-marsh/professional-errors-omissions) — sibling comparison (other line, or other pair for this line)
- [Aon vs Marsh Workers’ Compensation Insurance](https://spot.insure/compare/aon-vs-marsh/workers-compensation) — sibling comparison (other line, or other pair for this line)
- [AIG vs Aon Crime Insurance](https://spot.insure/compare/aig-vs-aon/crime) — sibling comparison (other line, or other pair for this line)
- [AIG vs Marsh Crime Insurance](https://spot.insure/compare/aig-vs-marsh/crime) — sibling comparison (other line, or other pair for this line)
- [Alliance Risk vs Aon Crime Insurance](https://spot.insure/compare/alliance-risk-vs-aon/crime) — sibling comparison (other line, or other pair for this line)
- [Alliance Risk vs Marsh Crime Insurance](https://spot.insure/compare/alliance-risk-vs-marsh/crime) — sibling comparison (other line, or other pair for this line)
- [Aon vs The Baldwin Group Crime Insurance](https://spot.insure/compare/aon-vs-baldwin/crime) — sibling comparison (other line, or other pair for this line)
- [Aon vs Beazley Crime Insurance](https://spot.insure/compare/aon-vs-beazley/crime) — sibling comparison (other line, or other pair for this line)

# Aon vs Marsh: How Do They Compare for Crime Insurance?

Aon identifies professional-service firms for its crime practice, while Marsh lists employee, third-party and cyber-enabled fraud exposures and complex placement experience.

## Research Scope and Use

Use this comparison to evaluate Aon and Marsh for Crime 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.

## Summary

Aon names law, accounting and consulting firms as its practice audience. Marsh describes crime policies addressing employee and third-party fraud, hacking, social engineering and tangible-asset theft, and says its specialists handle placements ranging from about $10 million to $110 million. [3](https://www.aon.com/en/capabilities/risk-transfer/professional-services-practice "Professional Services Practice") [8](https://www.marsh.com/en/services/financial-professional-liability/expertise/commercial-crime-insurance.html "Commercial crime insurance")

## 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?

Marsh suits technology and larger businesses seeking specialist cyber placement or broad global risk advice; small firms wanting a quick standard quote should compare its MMA route or digital agencies. [4](https://www.marsh.com/en/home.html "Marsh | Leader in risk, strategy, people, and investments") [5](https://www.marsh.com/content/dam/marsh/Documents/PDF/US-en/us-client-compensation-guide.pdf "Compensation guide for US clients") [6](https://www.marsh.com/en/services/marsh-mclennan-agency.html "Marsh McLennan Agency (MMA)") [7](https://www.marsh.com/en/industries/technology.html "Technology | Insurance Broking & Risk Management")

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

## What Is Crime Insurance?

Crime insurance can help reimburse specified business losses from theft and fraud, including employee theft and forgery. Compare those protections separately and ask whether a payment sent after an impersonation scam is covered. [10](https://www.insurance.ca.gov/01-consumers/105-type/95-guides/09-comm/commercialguide.cfm "Commercial Insurance Guide") [11](https://www.travelers.com/business-insurance/professional-liability-insurance/apps-forms/crime-non-financial-institutions "Crime Non-Financial Applications and Forms") [12](https://asset.trvstatic.com/download/assets/cri-3001.pdf/98f30f1063c911eeb2f1deb19c93b21f "Crime Terms and Conditions") [13](https://www.chubb.com/us-en/business-insurance/social-engineering-fraud-coverage-for-crime-insurance.html "Social Engineering Fraud Insurance") [14](https://asset.trvstatic.com/download/assets/cri-1100w-ind.pdf/9aa2577663c911ee91291279531924d3 "Commercial Crime Coverage Application")

## Key Differences in Crime Insurance

### Crime exposures and placement scope

Aon lists Crime among the coverages its Professional Services Practice helps arrange or advise on. Marsh names employee fraud, third-party fraud, collusion, hacking, social engineering and tangible-asset theft, while noting ransomware is usually excluded even though direct stolen funds may be addressed. Marsh reports experience with complex placements around $10 million to $110 million; that range describes placement experience, not a published standard limit for your account. [3](https://www.aon.com/en/capabilities/risk-transfer/professional-services-practice "Professional Services Practice") [8](https://www.marsh.com/en/services/financial-professional-liability/expertise/commercial-crime-insurance.html "Commercial crime insurance")

### Advisory process and top-up options

Aon describes professional-services risk advice using industry insight, data and tools. Marsh says its crime team provides market and risk education through placement and renewal and can arrange infill or top-up social-engineering cover above an existing program. Buyers with a current crime tower can ask Marsh about that specific excess layer; Aon’s reviewed source describes broader advisory decisions. [3](https://www.aon.com/en/capabilities/risk-transfer/professional-services-practice "Professional Services Practice") [8](https://www.marsh.com/en/services/financial-professional-liability/expertise/commercial-crime-insurance.html "Commercial crime insurance")

## What to Confirm in Crime Insurance Quotes

- Ask Marsh how ransomware, social-engineering and direct funds theft are treated in the proposed wording, and whether an excess layer attaches as expected. [3](https://www.aon.com/en/capabilities/risk-transfer/professional-services-practice "Professional Services Practice") [8](https://www.marsh.com/en/services/financial-professional-liability/expertise/commercial-crime-insurance.html "Commercial crime insurance")
- Ask Aon for its proposed crime terms; ask either broker to name insurer, total limit, attachment point, retention and renewal service. [3](https://www.aon.com/en/capabilities/risk-transfer/professional-services-practice "Professional Services Practice") [8](https://www.marsh.com/en/services/financial-professional-liability/expertise/commercial-crime-insurance.html "Commercial crime insurance")

## Offering Details

| Criteria | Aon Crime brokerage and risk-advisory offering | Marsh Commercial Crime Insurance Brokerage |
| --- | --- | --- |
| Role in This Line | Aon presents Crime as a line its Professional Services Practice helps arrange or advise on for professional-service firms. Aon is describing a global brokerage and advisory service, not issuing the underlying policy. The producing legal entity and carrier for any particular placement are not named on this page. [3](https://www.aon.com/en/capabilities/risk-transfer/professional-services-practice "Professional Services Practice") (Evidence: Company-reported; scope: Aon’s global professional-services practice page. This establishes a marketed brokerage/advisory offering, not policy issuance or account-specific placement..) | Marsh's financial and professional liability practice places commercial crime insurance; Marsh McLennan Agency (MMA), the middle-market subsidiary, also places crime coverage bundled with fidelity as part of its executive and professional liability practice. [8](https://www.marsh.com/en/services/financial-professional-liability/expertise/commercial-crime-insurance.html "Commercial crime insurance") [9](https://www.marshmma.com/us/solutions/executive-and-professional-liability.html "Expert Executive and Professional Liability Insurance") (Evidence: Company-reported; scope: Marsh corporate commercial crime page and MMA executive and professional liability page..) |
| Issuing Insurer | The reviewed practice page does not name the insurer or producing legal entity for a specific placement. Ask for both on the quote and binder. [3](https://www.aon.com/en/capabilities/risk-transfer/professional-services-practice "Professional Services Practice") (Evidence: Not found in reviewed sources; scope: Aon’s global practice page as reviewed 2026-09-30; no state-specific placement schedule or buyer quote was reviewed. This does not establish that Aon cannot arrange a placement..) | The reviewed pages do not name a specific crime insurer. Marsh says definitions and extensions for crime coverage differ across insurers and that it works to secure coverage aligned with a client's risks, implying the carrier varies by placement. [8](https://www.marsh.com/en/services/financial-professional-liability/expertise/commercial-crime-insurance.html "Commercial crime insurance") (Evidence: Not publicly disclosed; scope: Commercial crime insurance page as read on 2026-09-23..) |
| Who It’s For | Aon identifies law, accounting and consulting firms as the audience for its global Professional Services Practice. That audience scope does not establish eligibility for every firm or other business. [3](https://www.aon.com/en/capabilities/risk-transfer/professional-services-practice "Professional Services Practice") (Evidence: Company-reported; scope: Audience described for Aon’s global professional-services practice. It does not establish U.S. state availability or underwriting eligibility for a placement..) | Confirm in your quote. |
| Coverage Features | Aon lists Crime as a coverage area within its professional-services practice. The page does not describe covered dishonest acts, insured property, policy conditions or bond forms. [3](https://www.aon.com/en/capabilities/risk-transfer/professional-services-practice "Professional Services Practice") (Evidence: Company-reported; scope: Aon’s marketing description of the brokerage/coverage area. The page is not the insurer’s policy form and does not establish an insured's entitlement to coverage..) | Marsh lists employee white-collar fraud (including fidelity losses from trusted employees), third-party fraud, collusion, hacking or computer-related crime, social engineering fraud, and tangible asset theft as risks a commercial crime policy can address. It notes that crime policies usually exclude ransomware, though most cover direct financial losses from funds stolen by hackers. [8](https://www.marsh.com/en/services/financial-professional-liability/expertise/commercial-crime-insurance.html "Commercial crime insurance") (Evidence: Company-reported; scope: Commercial crime insurance page; the page is Marsh's global/UK financial-professional-liability practice content and cites a UK-based crime leader, so figures and coverage descriptions may not reflect a US-specific program..) |
| Limits and Retentions | The reviewed page does not state a buyer-specific limit, retention, deductible or other placement terms. Confirm these in the quote, bond or issued policy. [3](https://www.aon.com/en/capabilities/risk-transfer/professional-services-practice "Professional Services Practice") (Evidence: Not publicly disclosed; scope: Aon’s global practice page as reviewed 2026-09-30; no quote, bond form or issued policy was reviewed..) | Marsh says its team has experience handling complex crime placements ranging from about $10 million to $110 million (also stated in GBP as £10 million to £100 million elsewhere on the page), but does not publish standard limits, retentions or premiums for a specific placement. [8](https://www.marsh.com/en/services/financial-professional-liability/expertise/commercial-crime-insurance.html "Commercial crime insurance") (Evidence: Company-reported; scope: Commercial crime insurance page; a description of Marsh's placement experience range, not a quoted limit for any individual buyer..) |
| Risk Services | Aon says its professional-services advisors use industry knowledge, insights, data and tools to support risk-management and human-capital decisions. This is a company-described advisory service, not a claim outcome or policy benefit. [3](https://www.aon.com/en/capabilities/risk-transfer/professional-services-practice "Professional Services Practice") (Evidence: Company-reported; scope: Company-reported advisory services on Aon’s global practice page; account-specific service scope is not stated..) | Marsh says it provides insights on emerging crime risks, claim examples, market conditions and product education throughout renewal and placement, and offers infill and top-up social engineering cover in excess of a client's existing program. [8](https://www.marsh.com/en/services/financial-professional-liability/expertise/commercial-crime-insurance.html "Commercial crime insurance") (Evidence: Company-reported; scope: Commercial crime insurance page, Why Marsh section..) |
| How to Apply | Confirm in your quote. | You engage Marsh's crime specialists (Marsh corporate or MMA) directly to identify crime exposure and place coverage; the reviewed pages describe advisor-led placement rather than an online quote tool. [8](https://www.marsh.com/en/services/financial-professional-liability/expertise/commercial-crime-insurance.html "Commercial crime insurance") [9](https://www.marshmma.com/us/solutions/executive-and-professional-liability.html "Expert Executive and Professional Liability Insurance") (Evidence: Company-reported; scope: Commercial crime insurance and MMA executive and professional liability pages..) |

## Full Comparison

- [Aon vs Marsh](https://spot.insure/compare/aon-vs-marsh): all coverage lines, business roles, service and claims.
- [What Is Crime Insurance?](https://spot.insure/coverage/crime): Crime insurance addresses specified theft and fraud losses; employee theft, forgery, funds-transfer fraud and impersonation payments can have separate terms.
- [Aon vs Marsh Commercial Property Insurance](https://spot.insure/compare/aon-vs-marsh/commercial-property)
- [Aon vs Marsh Cyber Insurance](https://spot.insure/compare/aon-vs-marsh/cyber)
- [Aon vs Marsh D&O Insurance](https://spot.insure/compare/aon-vs-marsh/directors-officers)
- [Aon vs Marsh Employment Practices Liability Insurance](https://spot.insure/compare/aon-vs-marsh/employment-practices)
- [Aon vs Marsh Fiduciary Liability Insurance](https://spot.insure/compare/aon-vs-marsh/fiduciary)
- [Aon vs Marsh Kidnap and Ransom Insurance](https://spot.insure/compare/aon-vs-marsh/kidnap-ransom)
- [Aon vs Marsh Management Liability Insurance](https://spot.insure/compare/aon-vs-marsh/management-liability)
- [Aon vs Marsh Professional Liability (E&O) Insurance](https://spot.insure/compare/aon-vs-marsh/professional-errors-omissions)
- [Aon vs Marsh Workers’ Compensation Insurance](https://spot.insure/compare/aon-vs-marsh/workers-compensation)
- [AIG vs Aon Crime Insurance](https://spot.insure/compare/aig-vs-aon/crime)
- [AIG vs Marsh Crime Insurance](https://spot.insure/compare/aig-vs-marsh/crime)
- [Alliance Risk vs Aon Crime Insurance](https://spot.insure/compare/alliance-risk-vs-aon/crime)
- [Alliance Risk vs Marsh Crime Insurance](https://spot.insure/compare/alliance-risk-vs-marsh/crime)
- [Aon vs The Baldwin Group Crime Insurance](https://spot.insure/compare/aon-vs-baldwin/crime)
- [Aon vs Beazley Crime Insurance](https://spot.insure/compare/aon-vs-beazley/crime)

## Sources

### 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. [Professional Services Practice](https://www.aon.com/en/capabilities/risk-transfer/professional-services-practice). Aon; Named professional-services audiences and global advisory role, lines 125–128; line offerings and explanations lines 131–190; contact link lines 120–122. Global practice page; no U.S. state or account-specific placement schedule.. Accessed 2026-09-30.

### Marsh

4. [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.
5. [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.
6. [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.
7. [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.
8. [Commercial crime insurance](https://www.marsh.com/en/services/financial-professional-liability/expertise/commercial-crime-insurance.html). Marsh; Opening positioning; The crime risks businesses cannot ignore; What does commercial crime insurance cover? (employee white-collar fraud, third-party fraud, collusion, hacking, social engineering fraud, tangible asset theft); Why Marsh: complex crime placements up to $110 million. Accessed 2026-09-23.
9. [Expert Executive and Professional Liability Insurance](https://www.marshmma.com/us/solutions/executive-and-professional-liability.html). Marsh McLennan Agency; Our policies include D&O, E&O, EPL, commercial crime/fidelity, network security privacy risk/cyber, fiduciary, media liability, IP, architects and engineers, lawyers professional, and kidnap and ransom. Accessed 2026-09-23.

### Crime Insurance Guide

10. [Commercial Insurance Guide](https://www.insurance.ca.gov/01-consumers/105-type/95-guides/09-comm/commercialguide.cfm). California Department of Insurance; Crime. Accessed 2026-09-16.
11. [Crime Non-Financial Applications and Forms](https://www.travelers.com/business-insurance/professional-liability-insurance/apps-forms/crime-non-financial-institutions). Travelers; Opening paragraph; Sample Policy Forms. Accessed 2026-09-16.
12. [Crime Terms and Conditions](https://asset.trvstatic.com/download/assets/cri-3001.pdf/98f30f1063c911eeb2f1deb19c93b21f). The Travelers Companies, Inc.; I.A–G, printed/PDF pages 1–4; III.RR, printed/PDF p.13; V.B.1–2, printed/PDF pp.18–20; Consideration, printed/PDF p.1; III.P p.8; V.A.3 pp.16–17; V.A.4 p.17; V.B.3 p.20; I.A.3 p.1; III.C p.7; III.S pp.8–9; III.II and III.KK p.12; III.QQ p.13; V.A.5 pp.17–18 (printed/PDF pages); IV.J–O, printed/PDF pages 14–15. Accessed 2026-09-16.
13. [Social Engineering Fraud Insurance](https://www.chubb.com/us-en/business-insurance/social-engineering-fraud-coverage-for-crime-insurance.html). Chubb; Opening; coverage highlights. Accessed 2026-09-16.
14. [Commercial Crime Coverage Application](https://asset.trvstatic.com/download/assets/cri-1100w-ind.pdf/9aa2577663c911ee91291279531924d3). Travelers Casualty and Surety Company of America; I–III pages 1–2; IX–XI pages 3–4; V–VII, printed/PDF pages 2–3. 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. 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 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).

## Agent and Developer Resources

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