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Aon vs Markel Insurance

Aon markets a dedicated Middle Market practice for mid-sized organizations and says it serves growing businesses across North America. Markel’s U.S. small-business description names child care and enrichment, commercial and residential services, sports and fitness, and manufacturing. Both catalogues list Cyber liability, Workers’ compensation, General liability; compare the actual product, issuer and service route for your business before treating those labels as equivalent. 4,7,6,22,15,30

Introduction

Aon markets a dedicated Middle Market practice for mid-sized organizations and says it serves growing businesses across North America. For a business considering cyber liability, the practical difference is the entry point: Aon describes broker-arranged options for the requested product, while Markel distributes through wholesale and retail channels. Compare what fits your buying team and operations, then verify the actual product and terms. 4 15 7 6 30 14

Coverage Comparison

CoverageAonMarkel Insurance
Builders riskListed 14Aon names Construction Property/Builders Risk on its global construction page; confirm whether this line is offered for the buyer, state, and placement.Listed 35Markel builders risk
Cargo and transitListed 9Aon lists cargo placements in its global marine practice; U.S. eligibility, insurer, limits and policy terms are not stated on the reviewed page.Listed 34Markel cargo and transit coverage
Commercial autoListed 6Aon lists automobile liability within its global Professional Services Practice for law, accounting and consulting firms; U.S. availability and specific policy terms are not established.Not listed
Commercial propertyListed 8Aon describes commercial-property brokerage and risk management, with a U.S.-available analytics tool; tool availability does not establish state-specific insurance availability.Listed 33Markel commercial property
CrimeListed 6Aon lists crime within its global Professional Services Practice for law, accounting and consulting firms; U.S. availability and specific policy terms are not established.Listed 30Markel Cyber 360 eCrime component (standalone product not established)
Cyber liabilityListed 7,6Aon describes cyber insurance and related brokerage, analytics and claims support; confirm the producing entity, insurer, jurisdiction and policy terms for a U.S. placement.Listed 30Markel Cyber 360
Directors and officersListed 5Aon describes D&O brokerage and program services in a global practice; this does not identify the producer, insurer or state availability for a particular U.S. placement.Listed 32Markel private and nonprofit D&O
Employment practices liabilityListed 6Aon lists EPL for professional-services firms in a global practice; this does not establish eligibility for every U.S. employer or state.Listed 32Markel employment practices liability
Equipment breakdownNot listedListed 28Equipment-breakdown option within property coverage; standalone product not established
Fiduciary liabilityListed 6Aon lists fiduciary liability within its global Professional Services Practice for law, accounting and consulting firms; U.S. availability and specific policy terms are not established.Listed 32Markel fiduciary liability
General liabilityListed 14Aon lists general liability within construction liability coverage areas in its global construction practice; this does not establish a standalone or U.S.-available line.Listed 28Markel small-business casualty and property
Hired and non-owned autoNot listedListed 28Hired/non-owned auto option in small-business casualty; not commercial auto
Kidnap and ransomListed 6Aon lists kidnap and ransom within its global Professional Services Practice for law, accounting and consulting firms; U.S. availability and specific policy terms are not established.Not listed
Liquor liabilityNot listedListed 28Markel liquor liability
Management liabilityListed 6Aon describes management liability in its global Professional Services Practice as a partnership program for law, accounting and consulting firms, rather than a standalone line; U.S. availability and specific policy terms are not established.Listed 32Markel management liability
Media liabilityNot listedListed 30Markel Cyber 360 media liability component (standalone product not established)
Product liabilityNot listedListed 28Markel products liability
Professional errors and omissions (E&O)Listed 6Aon describes professional-liability/E&O services for law, accounting and consulting firms; a U.S. placement and any separate technology E&O terms remain to be confirmed.Listed 31Markel ProBiz miscellaneous E&O
Surety bondsListed 10Aon markets Commercial Surety globally and says availability depends on jurisdiction; the page does not establish U.S. placement availability.Listed 37Markel Surety bonds
Technology errors and omissions (E&O)Not listedListed 30Markel Cyber 360 technology professional liability component (standalone product not established)
Tools, equipment and inland marineNot listedListed 34Markel commercial inland marine
Umbrella and excess liabilityListed 14Aon lists umbrella and excess within construction liability coverage areas; ask whether either applies to your project and jurisdiction.Listed 36Markel excess casualty and umbrella
Workers’ compensationListed 14Aon lists workers compensation among global construction coverage areas; this does not establish state availability or a placement.Listed 29Markel Workers Compensation

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

Current Spot Scores

Each score uses the rubric for that provider’s documented role. Providers with more than one role may have a score for each.

Aon

Broker

Broker

6.7/ 10

Assessed provider: Aon. Scope: Aon group commercial insurance brokerage, assessed at brand level from Aon's published terms, its 2025 SEC filing, and U.S., U.K. and Irish regulator records. It does not assess a single producing entity, insurer or placement, and it is not a ruling on Aon's consulting or benefits businesses.

Provider assessment

Markel Insurance

Carrier

Carrier & MGA

7.1/ 10

Assessed entity: Markel Insurance Company. Scope: Markel Insurance Company (NAIC 38970, Illinois-domiciled) as an admitted U.S. commercial insurer, including its workers' compensation and liability lines. Other Markel insurers, Markel Group and the Lloyd's syndicates are context only, and it does not say which insurer will issue a given quote.

Provider assessment

Review Scores

These averages can combine ratings for different products, locations, and customer groups, including approximate BBB grade conversions. Read each review for the sources, scope, and calculation.

Aon

6.1/ 10

Review Score

3 rated sources

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.[4][6][7]

Read Aon reviews

Markel Insurance

7.5/ 10

Review Score

2 rated sources

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.[4][3]

Read Markel Insurance reviews

Key Differences Between Aon and Markel Insurance

Know Which Party Arranges the Policy

Aon’s U.S. Commercial Risk terms describe Commercial Risk Solutions U.S. as broker of record for certain insurance programs. Separate electronic-delivery terms name Aon Risk Services Companies, Inc. acting for itself and licensed brokerage subsidiaries to deliver arranged policies; the terms define an insurer as the policy issuer and risk bearer. For certain U.S. Commercial Risk programs, Aon says it consults with the client about market conditions, insurers to approach and program strategy, helps prepare underwriting information and applications, and obtains the client’s instructions to bind specific programs based on Aon’s proposal. The client signs applications that require a signature. Markel describes Markel Insurance as the insurance operations within Markel Group Inc., a Virginia holding company. Markel’s U.S. Wholesale and Specialty division distributes through wholesale and retail channels, with limited small-account binding authority; some direct marketing applies to certain admitted products and programs. 1 15

That difference matters if you want to work through an existing adviser, compare several insurers, or start from a self-service application. Ask whether your chosen producer can access the Aon product and the relevant Markel division for your state, and who is responsible for presenting the final terms. A brand name or online intake does not identify the insurer that will issue the policy. 1 15

Use Shared Lines to Frame the Quote

Both companies list Cyber liability, Workers’ compensation, General liability. The cyber liability description for Aon says “Aon describes cyber insurance and related brokerage, analytics and claims support; confirm the producing entity, insurer, jurisdiction and policy terms for a U.S. placement”; Markel’s listing describes “Markel Cyber 360.” The difference can matter: one description may place a line inside a broader product or limit it to a component, while the other describes a separate offer. Confirm the exact policy structure and wording on each quote. 7 6 30 14 29 28

Ask each respondent to name the exact product and form for cyber liability, then show how the proposal treats your revenue, services, locations, contracts and any physical operations. If the proposal places other lines separately, request a schedule that makes the separate policies and any intended coordination visible. Product names and catalogue entries alone cannot establish matched limits, exclusions or conditions.

Compare the Work After the Quote

The service arrangements also differ after submission:

Aon says it consults with clients before placing or renewing coverage and, where applicable, administers the insurer relationship for selected programs, including billing, data reporting and negotiated requirements. Markel describes commercial-agent portals for authorized users, including functions for listed lines; its U.S. account page separately lists documents, proof of insurance and payments for covered business products. 1 24 25

Confirm who handles certificates, midterm changes, billing, renewal information and claim notification for the policy you are considering. If Aon’s service is tied to an adviser or portal, ask whether your account and the proposed line qualify for it; do the same for the Markel product. Neither a group-wide service description nor a portal feature establishes a turnaround time or claim outcome. 1 24

What to Confirm in Quotes

  • Which exact product and policy form is proposed for cyber liability, and what limits, retentions, exclusions and endorsements apply to our operations?
  • Who is the licensed producer and which legal insurer would issue each policy in our state? Is the placement admitted or surplus lines?
  • What information and documents should we prepare, who will submit them, and what still needs underwriting approval before binding?
  • Who will service the policy after binding, and what account, renewal, certificate and claim-notification functions are available for this product?

Start with Aon if its stated customer focus or buying route matches how your team wants to arrange this line. Ask Markel for a proposal when one of its listed small-business or specialty classes fits the exposure. Compare the named insurer, policy structure, state route and account-service responsibilities before choosing between them. 4 22

Compare Services

What each provider documents about the services you may need

CriteriaAonMarkel Insurance
Business role

Aon’s U.S. Commercial Risk terms describe Commercial Risk Solutions U.S. as broker of record for certain insurance programs. Separate electronic-delivery terms name Aon Risk Services Companies, Inc. acting for itself and licensed brokerage subsidiaries to deliver arranged policies; the terms define an insurer as the policy issuer and risk bearer. These group-level descriptions do not identify the producer or authority for a particular placement. 1,2Company-reported. Company-reported U.S. Commercial Risk brokerage and electronic-delivery terms; certain programs only. No specific insured, licensed producer, appointment, policy issuer, state authority or placement was matched.

Markel describes Markel Insurance as the insurance operations within Markel Group Inc., a Virginia holding company. Markel Group's FY2025 filing identifies multiple underwriting subsidiaries. The insurer for a specific policy depends on the product, state and current quote or policy disclosures; Markel Insurance is not one standalone legal insurer. 15,16Company-reported. U.S. commercial-insurance identity and parent/business relationship; not a product-specific issuer assignment.

Customer focus

Aon markets a dedicated Middle Market practice for mid-sized organizations and says it serves growing businesses across North America. The reviewed page gives no numerical size cutoff and does not establish U.S.-only eligibility; Aon’s broader global client statement describes the parent’s client base, not this practice’s eligibility rules. 4,3Company-reported. Company-reported marketing page, North America; no numerical revenue, employee-count, state or U.S.-only eligibility definition is stated.

Markel's U.S. small-business page lists child care and enrichment, commercial and residential services, sports and fitness, and manufacturing among the segments it describes. Separately, its FY2025 filing describes Markel Insurance's global specialty business as underwriting hard-to-place risks; that wording is not specific to U.S. Wholesale and Specialty. 22,15Company-reported. Company-stated U.S. small-business examples and separate global business characterization; neither establishes eligibility.

Coverage lines
Application process

For certain U.S. Commercial Risk programs, Aon says it consults with the client about market conditions, insurers to approach and program strategy, helps prepare underwriting information and applications, and obtains the client’s instructions to bind specific programs based on Aon’s proposal. The client signs applications that require a signature. 1Company-reported. Company-reported contractual terms for certain U.S. Commercial Risk programs; not a universal workflow, online checkout claim, insurer role or guarantee that a quote can bind.

Markel's FY2025 filing says U.S. Wholesale and Specialty distributes through wholesale and retail channels on admitted and excess-and-surplus bases, including limited small-account binding authority. In 2025, 71% of this division's gross written premium was placed through wholesale brokers, 26% through retail agents and brokers, and the remainder through alternative channels. Certain admitted products and programs are marketed directly to consumers, but that does not establish online purchase or binding for every product. 15Company-reported. FY2025 Markel Insurance U.S. Wholesale and Specialty distribution; not the whole Markel Insurance business.

For workers' compensation, Markel directs applicants to submit an online application or contact an appointed agent to request a quote; the reviewed page does not establish that purchase and binding are completed online. 23Company-reported. Markel U.S. workers' compensation page only; route to request a quote.

Agencies can request a Markel appointment; Markel says appointments are made by affiliated insurer and product, and producers must hold the required state license. This is a producer onboarding route, not an insured's application path. 26Company-reported. Commercial agency appointment information; not retail purchase process.

Servicing and renewals

Aon says it consults with clients before placing or renewing coverage and, where applicable, administers the insurer relationship for selected programs, including billing, data reporting and negotiated requirements. The terms do not promise automatic renewal, a timetable, a specific market or a particular outcome. 1Company-reported. Company-reported terms for selected U.S. Commercial Risk programs; administration varies where applicable and may be changed by written agreement.

Markel describes agent portals for authorized commercial users to quote and bind listed lines and access account history, billing, claims details and policy documents. The page does not establish that every product supports every function. 24Company-reported. Commercial-agent portals; available functions vary by portal and product.

Markel's U.S. account page lists policy documents, proof-of-insurance downloads, payments and automatic payments for covered business products and directs customers with unlisted products to the agent on the policy. Renewal handling and renewal terms were not established in this review. 25Company-reported. Public portal description; not all products necessarily use the portal.

Sources

Aon Official Website

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

Markel Insurance Official Website

  1. Markel Group Inc. 2025 Form 10-K. 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.
  2. About us. Markel; Markel at a glance; description of Markel Insurance within Markel Group Inc. Accessed 2026-09-28.
  3. US Product Disclaimer. Markel; U.S. underwriting/entity and state-availability disclaimer; identifies Markel West Insurance Services, California license #2E11302, for certain non-admitted coverage. It does not state Markel Service national producer license #27585 or California DBA license #0645481. Accessed 2026-09-29.
  4. Insurance Programs. Markel; FAQ and legal disclaimer at page end; coverage by Markel insurers, Markel Service, Incorporated national producer license #27585 and California DBA license #0645481, and Markel West Insurance Services California license #2E11302 for certain non-admitted products. Accessed 2026-09-29.
  5. AM Best Affirms Credit Ratings of Markel Group Inc. and Its Subsidiaries. AM Best; Press release dated November 21, 2025; paragraphs naming ratings, rating rationale, and Markel North America Insurance Group members. Accessed 2026-09-28.
  6. North America Producer Compensation Disclosure. Markel; Base commissions, contingent compensation, business production/additional incentives, and Markel Specialty/Markel Service/insurer role statement. Accessed 2026-09-28.
  7. U.S. and Bermuda Claims Contacts. Markel; April 2026 claims-contact PDF footer: Markel West, Inc. d/b/a Markel West Insurance Services, California license #0D95581; coverage by one or more Markel insurers and non-admitted routes. Accessed 2026-09-29.
  8. Small Business Insurance. Markel; Small business products; Types of companies—Child care and enrichment, Commercial and residential services, Sports and fitness, Manufacturing. Accessed 2026-09-28.
  9. Workers Compensation Insurance. Markel; Introductory quote/application route; claims question and report-a-claim contact. Accessed 2026-09-28.
  10. Commercial Lines Agents & Broker Support. Markel; mPortal and Markel Online access; resources; digital distribution. Accessed 2026-09-28.
  11. My Account. Markel US; Online account portal capabilities; Business insurance; unlisted-product direction. Accessed 2026-09-28.
  12. Request appointment with Markel. Markel; Commercial and personal lines agency partner criteria; product-specific affiliate appointments; producer-license requirement. Accessed 2026-09-28.
  13. Markel Insurance Companies. Markel; Notice to California and Massachusetts Applicants and Insureds; U.S.-domiciled property and casualty insurer subsidiaries and affiliates; table of company names and market status (page states current as of 2024-04-01). Accessed 2026-09-28.
  14. Small Business Casualty and Property Insurance. Markel; What we offer; product/liability, property, general casualty, inland marine, excess umbrella, liquor liability, hired/non-owned auto, employee benefits liability, E&O and equipment breakdown references. Accessed 2026-09-29.
  15. Workers Compensation Insurance. Markel; Product overview and quote route; workers compensation/employers liability, eligible industries, claim and loss-control descriptions. Accessed 2026-09-29.
  16. Cyber Insurance Coverage. Markel; Markel Cyber 360; coverages available, cyber incident response, business interruption, privacy/security liability, media liability and technology professional liability. Accessed 2026-09-29.
  17. ProBiz | Professional Liability Coverage. Markel; What is Markel ProBiz; separate management liability and miscellaneous E&O; listed limits and qualifying business size. Accessed 2026-09-29.
  18. Private and Nonprofit Management Liability Insurance. Markel; What we offer; private/nonprofit segment; D&O, EPL, fiduciary and optional coverage sections. Accessed 2026-09-29.
  19. Commercial Property Insurance. Markel; Commercial property product summary and eligible risks. Accessed 2026-09-29.
  20. Commercial Inland Marine Insurance. Markel; What we offer; inland marine classes, cargo, contractors equipment, transportation and coverage structure. Accessed 2026-09-29.
  21. Builders Risk Insurance. Markel; Coverage features; construction projects and builders-risk scope. Accessed 2026-09-29.
  22. Excess Casualty Insurance. Markel; Excess and umbrella liability and admitted/non-admitted capabilities. Accessed 2026-09-29.
  23. Markel Surety. Markel; Products; contract bonds, commercial bonds, court and probate bonds. Accessed 2026-09-29.
  24. Markel Insurance Company Complaints. Better Business Bureau; Company complaints summary: 12 in last three years, 3 closed in last 12 months; complaint-category counts and displayed case examples; headquarters and corporate-owned locations. Accessed 2026-09-29.

Updated . 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. To suggest a correction, contact Spot with the page URL and supporting source.

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