---
title: "Aon vs Marsh: Cyber Insurance"
description: "Aon describes reviewing cyber forms and claims support; Marsh McLennan Agency lists incident response, interruption, extortion and liability coverage, while Marsh offers excess capacity above $200 million."
canonical: "https://spot.insure/compare/aon-vs-marsh/cyber"
page-type: "line-comparison"
updated-at: "2026-09-30"
comparison-pair: "aon-vs-marsh"
provider-a: "aon"
provider-b: "marsh"
coverage-line: "cyber"
---

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/cyber)

## Agent Guide

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

**Key facts:**
- Line: Cyber 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
- [Cyber Insurance guide](https://spot.insure/coverage/cyber) — 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 Crime Insurance](https://spot.insure/compare/aon-vs-marsh/crime) — 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 Cyber Insurance](https://spot.insure/compare/aig-vs-aon/cyber) — sibling comparison (other line, or other pair for this line)
- [AIG vs Marsh Cyber Insurance](https://spot.insure/compare/aig-vs-marsh/cyber) — sibling comparison (other line, or other pair for this line)
- [Alliance Risk vs Aon Cyber Insurance](https://spot.insure/compare/alliance-risk-vs-aon/cyber) — sibling comparison (other line, or other pair for this line)
- [Alliance Risk vs Marsh Cyber Insurance](https://spot.insure/compare/alliance-risk-vs-marsh/cyber) — sibling comparison (other line, or other pair for this line)
- [Amelia Risk vs Aon Cyber Insurance](https://spot.insure/compare/amelia-risk-vs-aon/cyber) — sibling comparison (other line, or other pair for this line)
- [Amelia Risk vs Marsh Cyber Insurance](https://spot.insure/compare/amelia-risk-vs-marsh/cyber) — sibling comparison (other line, or other pair for this line)

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

Aon describes reviewing cyber forms and claims support; Marsh McLennan Agency lists incident response, interruption, extortion and liability coverage, while Marsh offers excess capacity above $200 million.

## Research Scope and Use

Use this comparison to evaluate Aon and Marsh for Cyber 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 says cyber terms vary and describes brokerage review and claims advocacy. Marsh McLennan Agency lists response costs, network interruption, ransomware and privacy liability; Marsh says its Cyber ECHO facility can provide over $200 million per client in excess capacity. [3](https://www.aon.com/en/capabilities/cyber-resilience "Cyber Risk") [11](https://www.marshmma.com/us/solutions/cyber.html "Cyber 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?

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 Cyber Insurance?

Cyber insurance can help pay covered response costs and claims against your business after a cyber incident. If your business relies on data, software or outside providers, compare response limits, vendor outages and approval rules. [12](https://www.ftc.gov/business-guidance/small-businesses/cybersecurity/cyber-insurance "Cyber Insurance") [13](https://www.aig.com/content/dam/aig/america-canada/us/documents/business/cyber/cyberedge-wording-sample-specimen-form.pdf "CyberEdge specimen policy")

## Key Differences in Cyber Insurance

### Core coverage and high-limit excess

Aon describes cyber as a placement with varying insurer terms and says its team reviews policy offerings. Marsh lists incident investigation and response costs, network interruption, extortion and ransomware payments, data restoration and security/privacy liability as core coverage. Separately, Marsh describes Cyber ECHO as providing over $200 million of excess capacity per client, with a free first reinstatement and paid second reinstatement for separate events. Buyers should distinguish primary terms from excess structure. [3](https://www.aon.com/en/capabilities/cyber-resilience "Cyber Risk") [11](https://www.marshmma.com/us/solutions/cyber.html "Cyber Insurance | MMA")

### Claims advocacy and buying process

Aon describes claims preparation and advocacy plus relationships with outside response providers under separate contracts. Marsh says Marsh specialists review claims, support litigation management and work with forensic accountants to prepare proof of loss. Marsh/MMA placements are advisor-led rather than self-serve. A buyer should map who advocates at each layer and whether the account will be serviced by Marsh or MMA. [3](https://www.aon.com/en/capabilities/cyber-resilience "Cyber Risk") [10](https://www.marsh.com/en/services/cyber-risk/expertise/claims-advocacy.html "Claims Advocacy")

## What to Confirm in Cyber Insurance Quotes

- Ask Marsh how Cyber ECHO attaches, which reinstatements apply and whether the proposed primary policy matches the listed core coverage. [3](https://www.aon.com/en/capabilities/cyber-resilience "Cyber Risk") [11](https://www.marshmma.com/us/solutions/cyber.html "Cyber Insurance | MMA")
- Ask Aon about separate response-vendor contracts; ask Marsh which team handles claims advocacy and the excess layer. [3](https://www.aon.com/en/capabilities/cyber-resilience "Cyber Risk") [11](https://www.marshmma.com/us/solutions/cyber.html "Cyber Insurance | MMA")

## Offering Details

| Criteria | Aon Cyber brokerage and risk-advisory offering | Marsh Cyber Insurance Brokerage |
| --- | --- | --- |
| Role in This Line | Aon describes cyber insurance brokerage and risk-advisory services. It is not identified as the risk-bearing insurer, and the global page does not name the carrier for a particular placement. [3](https://www.aon.com/en/capabilities/cyber-resilience "Cyber Risk") (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's cyber risk practice places and advises on cyber insurance brokerage; it does not underwrite the policies it places. [8](https://www.marsh.com/en/services/cyber-risk/expertise/cyber-insurance.html "Cyber Insurance") (Evidence: Company-reported; scope: Marsh corporate cyber insurance product page..)<br><br>Marsh McLennan Agency (MMA), Marsh's middle-market subsidiary, places cyber coverage and acts as a carrier liaison, combining placement with claims advocacy. [11](https://www.marshmma.com/us/solutions/cyber.html "Cyber Insurance | MMA") (Evidence: Company-reported; scope: MMA cyber solutions page..) |
| 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/cyber-resilience "Cyber Risk") (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..) | The reviewed pages do not name a specific cyber insurer for a standard placement. Marsh's Cyber ECHO excess facility lets clients choose underwriting from Lloyd's of London syndicates, company markets or Bermuda-based insurers, so the carrier varies by placement. [9](https://www.marsh.com/en/services/cyber-risk/expertise/cyber-echo.html "Cyber ECHO") (Evidence: Not publicly disclosed; scope: Cyber ECHO facility page, which covers excess layers rather than every primary policy Marsh places..) |
| Who It’s For | Aon describes cyber services for organizations managing cyber risk. Its global practice page does not publish a complete industry, revenue, security-control or state-by-state eligibility schedule. [3](https://www.aon.com/en/capabilities/cyber-resilience "Cyber Risk") (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..) | MMA says any company can benefit from cyber coverage, but prioritizes organizations that store significant customer data, run large customer databases or hold valuable digital assets. [11](https://www.marshmma.com/us/solutions/cyber.html "Cyber Insurance | MMA") (Evidence: Company-reported; scope: MMA cyber solutions FAQ; MMA describes its own client base as middle-market organizations generally..) |
| Coverage Features | Aon describes cyber insurance as one part of cyber risk financing and says it reviews policy offerings because terms and conditions vary. For professional-services firms, it discusses coordinating cyber and professional-liability coverage. This is brokerage guidance and does not establish the terms of any cyber policy. [3](https://www.aon.com/en/capabilities/cyber-resilience "Cyber Risk") (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..) | MMA lists incident investigation and response costs, network interruption/extra expense, extortion and ransomware payments, data restoration, and security and privacy liability as core cyber coverages, with media liability, privacy regulatory defense and reputation-based income loss available as additional coverages. [11](https://www.marshmma.com/us/solutions/cyber.html "Cyber Insurance | MMA") (Evidence: Company-reported; scope: MMA cyber solutions page; actual policy wording and insurer vary by placement..) |
| 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/cyber-resilience "Cyber Risk") (Evidence: Not publicly disclosed; scope: Aon’s global product/capability page reviewed 2026-09-30; no buyer quote or policy form was reviewed..) | Marsh says its Cyber ECHO excess facility can provide over $200 million of cyber capacity per client, with a free first reinstatement and a paid second reinstatement for separate cyber events within a policy year. [9](https://www.marsh.com/en/services/cyber-risk/expertise/cyber-echo.html "Cyber ECHO") (Evidence: Company-reported; scope: Cyber ECHO facility page; describes excess capacity Marsh can arrange, not a standard primary limit..) |
| Risk Services | Aon describes cyber claims advocacy and preparation and relationships with third-party incident-response providers. The retained official source notes that provider contracts are separate, no performance guarantee is made, and referral remuneration may occur; confirm the providers, scope and compensation applicable to a client. [3](https://www.aon.com/en/capabilities/cyber-resilience "Cyber Risk") (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. | You engage a named Marsh or MMA cyber specialist to design a placement; the reviewed pages describe advisor-led placement and risk analytics rather than an online self-serve quote. [8](https://www.marsh.com/en/services/cyber-risk/expertise/cyber-insurance.html "Cyber Insurance") [11](https://www.marshmma.com/us/solutions/cyber.html "Cyber Insurance | MMA") (Evidence: Company-reported; scope: Marsh and MMA cyber pages, which list dedicated cyber brokerage and placement leaders..) |
| Claims Support | Confirm in your quote. | Marsh's global claims and incident-management specialists review cyber claims, support litigation management and work with forensic accountants to prepare proof of loss, advocating with insurers on the client's behalf. [10](https://www.marsh.com/en/services/cyber-risk/expertise/claims-advocacy.html "Claims Advocacy") (Evidence: Company-reported; scope: Claims Advocacy expertise page; recovery outcomes described as company-reported and not independently verified..) |

## Full Comparison

- [Aon vs Marsh](https://spot.insure/compare/aon-vs-marsh): all coverage lines, business roles, service and claims.
- [What Is Cyber Insurance?](https://spot.insure/coverage/cyber): Cyber insurance can help pay covered breach response, data recovery, interruption and liability costs; vendor incidents and funds-transfer fraud need separate checks.
- [Aon vs Marsh Commercial Property Insurance](https://spot.insure/compare/aon-vs-marsh/commercial-property)
- [Aon vs Marsh Crime Insurance](https://spot.insure/compare/aon-vs-marsh/crime)
- [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 Cyber Insurance](https://spot.insure/compare/aig-vs-aon/cyber)
- [AIG vs Marsh Cyber Insurance](https://spot.insure/compare/aig-vs-marsh/cyber)
- [Alliance Risk vs Aon Cyber Insurance](https://spot.insure/compare/alliance-risk-vs-aon/cyber)
- [Alliance Risk vs Marsh Cyber Insurance](https://spot.insure/compare/alliance-risk-vs-marsh/cyber)
- [Amelia Risk vs Aon Cyber Insurance](https://spot.insure/compare/amelia-risk-vs-aon/cyber)
- [Amelia Risk vs Marsh Cyber Insurance](https://spot.insure/compare/amelia-risk-vs-marsh/cyber)

## 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. [Cyber Risk](https://www.aon.com/en/capabilities/cyber-resilience). Aon; Global cyber risk financing/insurance overview and brokerage practice; claims preparation and advocacy, incident response providers and referral remuneration disclosures, lines 194–230 as retained in Aon’s official source record; Professional Services Practice cyber cross-reference, lines 151–156.. 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. [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, Cyber ECHO; Rachel Lavender, US and Canada Cyber Brokerage Leader. Accessed 2026-09-23.
9. [Cyber ECHO](https://www.marsh.com/en/services/cyber-risk/expertise/cyber-echo.html). Marsh; New for 2026: over $200 million capacity; free first reinstatement and paid second reinstatement; one underwriting lead and two claims leads per panel; Lloyd's, company markets or Bermuda-based insurers. Accessed 2026-09-23.
10. [Claims Advocacy](https://www.marsh.com/en/services/cyber-risk/expertise/claims-advocacy.html). Marsh; Global claims specialists negotiating cyber coverage issues; proof of loss with forensic accountants. Accessed 2026-09-23.
11. [Cyber Insurance | MMA](https://www.marshmma.com/us/solutions/cyber.html). Marsh McLennan Agency; Benefits of Cyber: understand, mitigate, respond, recover; Cyber Coverage list (incident investigation and response, network interruption, extortion/ransomware, data restoration, security and privacy liability, additional coverages); FAQ: Who needs cyber insurance coverage?. Accessed 2026-09-23.

### Cyber Insurance Guide

12. [Cyber Insurance](https://www.ftc.gov/business-guidance/small-businesses/cybersecurity/cyber-insurance). Federal Trade Commission; Opening; First-Party and Third-Party Coverage; First-Party Coverage; Third-Party Coverage; What Should Your Cyber Insurance Policy Cover. Accessed 2026-09-16.
13. [CyberEdge specimen policy](https://www.aig.com/content/dam/aig/america-canada/us/documents/business/cyber/cyberedge-wording-sample-specimen-form.pdf). AIG; General Terms §§4–6, PDF pp.3–6; Security and Privacy §1 p.11, §2(l)/(p) p.14, §3 pp.15–18, exclusions p.18; Event Management §1 and §2(h), PDF pp.19–20. 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/cyber.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)