---
title: "Aon vs Markel Insurance: Umbrella and Excess Liability Insurance"
description: "Aon describes project risk advice for construction placements; Markel Insurance describes small-business umbrella excess that adds limits above primary policies subject to underlying coverage and risk review."
canonical: "https://spot.insure/compare/aon-vs-markel/umbrella-excess"
page-type: "line-comparison"
updated-at: "2026-09-30"
comparison-pair: "aon-vs-markel"
provider-a: "aon"
provider-b: "markel"
coverage-line: "umbrella-excess"
---

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-markel/umbrella-excess)

## Agent Guide

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

**Key facts:**
- Line: Umbrella and Excess Liability Insurance. Providers: Aon and Markel Insurance.
- 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 Markel Insurance](https://spot.insure/compare/aon-vs-markel) — parent: all coverage lines for this pair
- [Umbrella and Excess Liability Insurance guide](https://spot.insure/coverage/umbrella-excess) — coverage explainer for this line
- [Aon profile](https://spot.insure/insurance-providers/aon) — provider profile (evidence)
- [Markel Insurance profile](https://spot.insure/insurance-providers/markel) — provider profile (evidence)
- [Aon vs Markel Insurance Commercial Property Insurance](https://spot.insure/compare/aon-vs-markel/commercial-property) — sibling comparison (other line, or other pair for this line)
- [Aon vs Markel Insurance Crime Insurance](https://spot.insure/compare/aon-vs-markel/crime) — sibling comparison (other line, or other pair for this line)
- [Aon vs Markel Insurance Cyber Insurance](https://spot.insure/compare/aon-vs-markel/cyber) — sibling comparison (other line, or other pair for this line)
- [Aon vs Markel Insurance D&O Insurance](https://spot.insure/compare/aon-vs-markel/directors-officers) — sibling comparison (other line, or other pair for this line)
- [Aon vs Markel Insurance Employment Practices Liability Insurance](https://spot.insure/compare/aon-vs-markel/employment-practices) — sibling comparison (other line, or other pair for this line)
- [Aon vs Markel Insurance Fiduciary Liability Insurance](https://spot.insure/compare/aon-vs-markel/fiduciary) — sibling comparison (other line, or other pair for this line)
- [Aon vs Markel Insurance General Liability Insurance](https://spot.insure/compare/aon-vs-markel/general-liability) — sibling comparison (other line, or other pair for this line)
- [Aon vs Markel Insurance Management Liability Insurance](https://spot.insure/compare/aon-vs-markel/management-liability) — sibling comparison (other line, or other pair for this line)
- [Aon vs Markel Insurance Professional Liability (E&O) Insurance](https://spot.insure/compare/aon-vs-markel/professional-errors-omissions) — sibling comparison (other line, or other pair for this line)
- [Aon vs Markel Insurance Workers’ Compensation Insurance](https://spot.insure/compare/aon-vs-markel/workers-compensation) — sibling comparison (other line, or other pair for this line)
- [AIG vs Markel Insurance Umbrella and Excess Liability Insurance](https://spot.insure/compare/aig-vs-markel/umbrella-excess) — sibling comparison (other line, or other pair for this line)
- [Amelia Risk vs Markel Insurance Umbrella and Excess Liability Insurance](https://spot.insure/compare/amelia-risk-vs-markel/umbrella-excess) — sibling comparison (other line, or other pair for this line)
- [Aon vs Kinro Umbrella and Excess Liability Insurance](https://spot.insure/compare/aon-vs-kinro/umbrella-excess) — sibling comparison (other line, or other pair for this line)
- [Aon vs Liberty Mutual Umbrella and Excess Liability Insurance](https://spot.insure/compare/aon-vs-liberty-mutual/umbrella-excess) — sibling comparison (other line, or other pair for this line)
- [Aon vs Mylo Umbrella and Excess Liability Insurance](https://spot.insure/compare/aon-vs-mylo/umbrella-excess) — sibling comparison (other line, or other pair for this line)
- [Aon vs Nationwide Umbrella and Excess Liability Insurance](https://spot.insure/compare/aon-vs-nationwide/umbrella-excess) — sibling comparison (other line, or other pair for this line)

# Aon vs Markel Insurance: How Do They Compare for Umbrella and Excess Liability Insurance?

Aon describes project risk advice for construction placements; Markel Insurance describes small-business umbrella excess that adds limits above primary policies subject to underlying coverage and risk review.

## Research Scope and Use

Use this comparison to evaluate Aon and Markel Insurance for Umbrella and Excess Liability 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 describes project risk advice for construction placements; Markel Insurance describes small-business umbrella excess that adds limits above primary policies subject to underlying coverage and risk review. [3](https://www.aon.com/en/capabilities/risk-transfer/construction-and-infrastructure-insurance-and-risk-management "Construction and Infrastructure Insurance and Risk Management") [6](https://www.markel.com/us/commercial/small-business/small-business-casualty-and-property "Small Business Casualty and Property 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)

## Markel Insurance: Specialty Business and Products

Markel Insurance is Markel Group's specialty and small-business insurance business, with offerings across packages, workers' compensation, cyber, professional and management liability, property, marine, and surety. Products use different insurers and distribution routes, so compare the issuer and terms shown on the specific quote. [4](https://www.markel.com/about-us "About us") [5](https://www.sec.gov/Archives/edgar/data/1096343/000109634326000020/mkl-20251231.htm "Markel Group Inc. 2025 Form 10-K")

[Markel Insurance profile](https://spot.insure/insurance-providers/markel)

## What Is Umbrella and Excess Liability Insurance?

Umbrella or excess insurance adds liability limits above the policies named in the quote after a covered claim exhausts their limits. It may fit if a contract sets higher limits; check which primary policies are listed and any gaps between them. [7](https://www.iii.org/publication/insuring-your-business-small-business-owners-guide-to-insurance/specific-coverages/liability-insurance "Liability Insurance") [8](https://www.insurance.ca.gov/01-consumers/105-type/95-guides/09-comm/commercialguide.cfm "Commercial Insurance Guide") [9](https://www.insurance.ca.gov/0200-industry/0050-renew-license/0200-requirements/casualty/lines-of-ins.cfm "Lines of Insurance") [10](https://www.coverdash.com/coverage "Coverage Hub") [11](https://kinro.com/products "Products")

## Key Differences in Umbrella and Excess Liability Insurance

### Construction Project Scope and Small Business Appetite

Aon frames its umbrella and excess work within a global construction practice serving contractors, owners, developers and project professionals. Markel Insurance describes umbrella excess for small-business risks within its casualty appetite, with a placement depending on underlying coverage and risk review. A construction buyer should establish whether its account fits Markel Insurance’s stated small-business scope or needs Aon’s project-focused market approach. [3](https://www.aon.com/en/capabilities/risk-transfer/construction-and-infrastructure-insurance-and-risk-management "Construction and Infrastructure Insurance and Risk Management") [6](https://www.markel.com/us/commercial/small-business/small-business-casualty-and-property "Small Business Casualty and Property Insurance")

### Additional Limits Above Primary Policies

Markel Insurance describes excess umbrella liability as additional limits beyond primary policies, subject to the underlying coverage and issued terms. Aon lists umbrella and excess as separate construction coverage areas but does not publish an attachment point or policy form. Compare the proposed Markel Insurance layer and any Aon placement against the same underlying schedule and contract limit. [3](https://www.aon.com/en/capabilities/risk-transfer/construction-and-infrastructure-insurance-and-risk-management "Construction and Infrastructure Insurance and Risk Management") [6](https://www.markel.com/us/commercial/small-business/small-business-casualty-and-property "Small Business Casualty and Property Insurance")

### Starting a Placement

Markel Insurance invites prospective customers or brokers to contact its team; the page does not state a binding timeline. Aon describes a global construction team and market access, but not a step-by-step submission route. Ask both who will negotiate the attachment and which terms remain subject to carrier review. [3](https://www.aon.com/en/capabilities/risk-transfer/construction-and-infrastructure-insurance-and-risk-management "Construction and Infrastructure Insurance and Risk Management") [6](https://www.markel.com/us/commercial/small-business/small-business-casualty-and-property "Small Business Casualty and Property Insurance")

## What to Confirm in Umbrella and Excess Liability Insurance Quotes

- Ask Markel Insurance whether the business and project fit its small-business casualty appetite and request the underlying requirements. [6](https://www.markel.com/us/commercial/small-business/small-business-casualty-and-property "Small Business Casualty and Property Insurance")
- Ask Aon for the proposed carrier, attachment point, limit and form. [3](https://www.aon.com/en/capabilities/risk-transfer/construction-and-infrastructure-insurance-and-risk-management "Construction and Infrastructure Insurance and Risk Management")

## Offering Details

| Criteria | Aon Umbrella and Excess Liability brokerage and risk-advisory offering | Markel umbrella excess (official overview) |
| --- | --- | --- |
| Role in This Line | Aon says its global construction practice designs and places risk solutions and uses broking experience and a global network across construction insurance lines. For umbrella and excess liability, this is evidence of Aon’s brokered market offering; the page does not identify the insurer for a buyer’s placement. [3](https://www.aon.com/en/capabilities/risk-transfer/construction-and-infrastructure-insurance-and-risk-management "Construction and Infrastructure Insurance and Risk Management") (Evidence: Company-reported; scope: Aon’s global construction and infrastructure practice page. This establishes a marketed brokerage/advisory offering, not policy issuance or account-specific placement..) | Markel describes offering umbrella excess for the audience stated on the cited product page. [6](https://www.markel.com/us/commercial/small-business/small-business-casualty-and-property "Small Business Casualty and Property Insurance") (Evidence: Company-reported; scope: umbrella excess marketed by markel; 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 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/construction-and-infrastructure-insurance-and-risk-management "Construction and Infrastructure Insurance and Risk Management") (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..) | Confirm in your quote. |
| Who It’s For | Aon describes its global construction and infrastructure practice as serving contractors, owners, developers, engineers, architects, designers, financiers and investors, and says it works with organizations of varied sizes and complexity. [3](https://www.aon.com/en/capabilities/risk-transfer/construction-and-infrastructure-insurance-and-risk-management "Construction and Infrastructure Insurance and Risk Management") (Evidence: Company-reported; scope: Audience described for Aon’s global construction and infrastructure practice. It does not establish U.S. state availability or underwriting eligibility for a placement..) | Small-business risks within the page's casualty appetite; an umbrella placement depends on underlying coverage and risk review. [6](https://www.markel.com/us/commercial/small-business/small-business-casualty-and-property "Small Business Casualty and Property Insurance") (Evidence: Company-reported; scope: umbrella excess marketed by markel; 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 lists Umbrella and Excess Liability as separate coverage areas within construction liability. The page does not specify an attachment point, underlying policy, limits or terms for a particular placement. [3](https://www.aon.com/en/capabilities/risk-transfer/construction-and-infrastructure-insurance-and-risk-management "Construction and Infrastructure Insurance and Risk Management") (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..) | The cited product page describes excess umbrella liability providing additional limits beyond primary policies, subject to the underlying coverage and policy terms. Marketing description only; actual coverage, exclusions, conditions, limits, and availability depend on the issued policy and jurisdiction. [6](https://www.markel.com/us/commercial/small-business/small-business-casualty-and-property "Small Business Casualty and Property Insurance") (Evidence: Company-reported; scope: umbrella excess marketed by markel; 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 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/construction-and-infrastructure-insurance-and-risk-management "Construction and Infrastructure Insurance and Risk Management") (Evidence: Not publicly disclosed; scope: Aon’s global practice page as reviewed 2026-09-30; no quote, bond form or issued policy 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.markel.com/us/commercial/small-business/small-business-casualty-and-property "Small Business Casualty and Property Insurance") (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 project risk-advisory services to understand project-specific risks and develop risk-transfer, management or mitigation strategies. It also describes a global construction team and market access. These are company-reported brokerage and advisory services, not coverage benefits. [3](https://www.aon.com/en/capabilities/risk-transfer/construction-and-infrastructure-insurance-and-risk-management "Construction and Infrastructure Insurance and Risk Management") (Evidence: Company-reported; scope: Company-reported advisory services on Aon’s global practice page; account-specific service scope is not stated..) | Confirm in your quote. |
| How to Apply | Confirm in your quote. | The page invites prospective customers or brokers to contact Markel or the named underwriting team. The page does not establish a quote, bind, or coverage-effective timeline. [6](https://www.markel.com/us/commercial/small-business/small-business-casualty-and-property "Small Business Casualty and Property Insurance") (Evidence: Company-reported; scope: umbrella excess marketed by markel; scope is limited to the cited official product overview and described audience. This is not a policy form or a universal eligibility statement..) |

## Full Comparison

- [Aon vs Markel Insurance](https://spot.insure/compare/aon-vs-markel): all coverage lines, business roles, service and claims.
- [What Is Umbrella and Excess Liability Insurance?](https://spot.insure/coverage/umbrella-excess): Umbrella or excess insurance can add liability limits above selected underlying policies when a covered claim exceeds them; compare the schedule and any gaps.
- [Aon vs Markel Insurance Commercial Property Insurance](https://spot.insure/compare/aon-vs-markel/commercial-property)
- [Aon vs Markel Insurance Crime Insurance](https://spot.insure/compare/aon-vs-markel/crime)
- [Aon vs Markel Insurance Cyber Insurance](https://spot.insure/compare/aon-vs-markel/cyber)
- [Aon vs Markel Insurance D&O Insurance](https://spot.insure/compare/aon-vs-markel/directors-officers)
- [Aon vs Markel Insurance Employment Practices Liability Insurance](https://spot.insure/compare/aon-vs-markel/employment-practices)
- [Aon vs Markel Insurance Fiduciary Liability Insurance](https://spot.insure/compare/aon-vs-markel/fiduciary)
- [Aon vs Markel Insurance General Liability Insurance](https://spot.insure/compare/aon-vs-markel/general-liability)
- [Aon vs Markel Insurance Management Liability Insurance](https://spot.insure/compare/aon-vs-markel/management-liability)
- [Aon vs Markel Insurance Professional Liability (E&O) Insurance](https://spot.insure/compare/aon-vs-markel/professional-errors-omissions)
- [Aon vs Markel Insurance Workers’ Compensation Insurance](https://spot.insure/compare/aon-vs-markel/workers-compensation)
- [AIG vs Markel Insurance Umbrella and Excess Liability Insurance](https://spot.insure/compare/aig-vs-markel/umbrella-excess)
- [Amelia Risk vs Markel Insurance Umbrella and Excess Liability Insurance](https://spot.insure/compare/amelia-risk-vs-markel/umbrella-excess)
- [Aon vs Kinro Umbrella and Excess Liability Insurance](https://spot.insure/compare/aon-vs-kinro/umbrella-excess)
- [Aon vs Liberty Mutual Umbrella and Excess Liability Insurance](https://spot.insure/compare/aon-vs-liberty-mutual/umbrella-excess)
- [Aon vs Mylo Umbrella and Excess Liability Insurance](https://spot.insure/compare/aon-vs-mylo/umbrella-excess)
- [Aon vs Nationwide Umbrella and Excess Liability Insurance](https://spot.insure/compare/aon-vs-nationwide/umbrella-excess)

## 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. [Construction and Infrastructure Insurance and Risk Management](https://www.aon.com/en/capabilities/risk-transfer/construction-and-infrastructure-insurance-and-risk-management). Aon; Construction client audience and global placement role, lines 123–126; offering descriptions lines 135–156; coverage-area taxonomy lines 167–195; contact link lines 120–122. Global practice page; no U.S. state or account-specific placement schedule.. Accessed 2026-09-30.

### Markel Insurance

4. [About us](https://www.markel.com/about-us). Markel; Markel at a glance; description of Markel Insurance within Markel Group Inc.. Accessed 2026-09-28.
5. [Markel Group Inc. 2025 Form 10-K](https://www.sec.gov/Archives/edgar/data/1096343/000109634326000020/mkl-20251231.htm). U.S. Securities and Exchange Commission; filed by Markel Group Inc.; Cover page; Part I, Item 1 Business—Markel Insurance, U.S. Wholesale and Specialty, Programs and Solutions; Part II, Item 7/8 for group and segment risks. Accessed 2026-09-28.
6. [Small Business Casualty and Property Insurance](https://www.markel.com/us/commercial/small-business/small-business-casualty-and-property). Markel; Excess umbrella section; added liability limits beyond primary policies.. Accessed 2026-09-30.

### Umbrella and Excess Liability Insurance Guide

7. [Liability Insurance](https://www.iii.org/publication/insuring-your-business-small-business-owners-guide-to-insurance/specific-coverages/liability-insurance). Insurance Information Institute; Heading Umbrella Liability Insurance; sentence Umbrella Liability—also known as Excess Liability Insurance; underlying policies listed with limits; typically GL, auto and employers’ liability; starts when a covered loss exhausts the primary per occurrence limit; Most umbrella policies exclude EPL, professional liability, product recall, workers compensation, asbestos, pollution, war and terrorism. Accessed 2026-09-16.
8. [Commercial Insurance Guide](https://www.insurance.ca.gov/01-consumers/105-type/95-guides/09-comm/commercialguide.cfm). California Department of Insurance; Commercial Umbrella; excess over a basic liability policy; auto/CGL/WC or any liability policy can be covered; may respond if basic policy not in force or for gaps; SIR when no underlying. Accessed 2026-09-16.
9. [Lines of Insurance](https://www.insurance.ca.gov/0200-industry/0050-renew-license/0200-requirements/casualty/lines-of-ins.cfm). California Department of Insurance; Umbrella or Excess Liability Policy: excess limits over existing liability; may provide additional coverages not provided by underlying policies. Accessed 2026-09-16.
10. [Coverage Hub](https://www.coverdash.com/coverage). Coverdash; Excess & Specialty: Umbrella; Excess Liability. Accessed 2026-09-16.
11. [Products](https://kinro.com/products). Kinro; 09 Umbrella/Excess: additional limits above scheduled underlying policies; when to review; reviewed with. 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).

## Markel Insurance Reviews

Review Score: 7.5 / 10 from 2 rated sources, equally weighted.

There is little public customer feedback on Markel. Trustpilot shows 2.5 out of 5 from just 5 reviews, and BBB lists 12 complaints closed in the last three years.

- J.D. Power: Commercial Lines Insurers agent satisfaction score 726 (out of 1,000). 2022 commercial-lines independent-agent satisfaction study and 2025 small-commercial customer study; these use different populations and measures Period: 2022. Checked 2026-09-29. [2025 U.S. Small Commercial Insurance Study](https://www.jdpower.com/business/press-releases/2025-us-small-commercial-insurance-study); [2022 U.S. Independent Agent Satisfaction Study](https://www.jdpower.com/sites/default/files/file/2022-10/2022134%20U.S.%20Independent%20Agent.pdf)
- Trustpilot: TrustScore 2.5 (out of 5); 5 reviews. Trustpilot brand-level page for markel.com. It mixes products and is not mapped to one legal insurer. Checked 2026-09-29. [Markel Reviews](https://www.trustpilot.com/review/markel.com)
- BBB: BBB business grade A+. BBB business profile for Markel Insurance Company headquarters/corporate-owned locations; review and complaint submissions may include other products and affiliates Checked 2026-09-29. [Markel Insurance Company Business Profile](https://www.bbb.org/us/va/glen-allen/profile/insurance-companies/markel-insurance-company-0603-4017547); [Markel Insurance Company Complaints](https://www.bbb.org/us/va/glen-allen/profile/insurance-companies/markel-insurance-company-0603-4017547/complaints)
- BBB: Complaints 12; 12 reviews. BBB profile for Markel Insurance Company; complaints may include other Markel products and affiliates and BBB says not all submissions are displayed. Period: last 3 years, as displayed 2026-09-29. Checked 2026-09-29. [Markel Insurance Company Complaints](https://www.bbb.org/us/va/glen-allen/profile/insurance-companies/markel-insurance-company-0603-4017547/complaints)

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

## Agent and Developer Resources

- [Markdown page](https://spot.insure/compare/aon-vs-markel/umbrella-excess.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)