Aon vs Coalition: Professional Liability / E&O Insurance

Coalition's MPL only comes as an add-on to an Active Cyber quote through appointed brokers; Aon works as a global broker and adviser for law, accounting and consulting firms and issues no policy itself.

Kearny Risk organizes these comparisons for firms whose advice, content or technology creates professional exposures.Research updated 2026-09-30

Aon describes tailored E&O placement for professional firms. Coalition offers MPL only as an add-on to Active Cyber Insurance and says it covers defense, settlements and judgments for professional-service errors.

What Are the Key Differences Between Aon and Coalition Professional Liability (E&O) Insurance?

Form and Coverage Scope

Aon says it tailors professional-liability structures for professional-service firms, with law, accounting and consulting among its named audiences. Coalition offers miscellaneous professional liability only as an addition to an Active Cyber Insurance quote, not as a standalone policy. It describes coverage for defense costs, settlements, judgments and expenses arising from errors, negligence, service failures or misstatements, on a duty-to-defend basis. A buyer should consider whether E&O must be tied to a cyber purchase. [1] [2]

Buyer Fit and Policy Terms

Coalition says its in-house claims team manages both MPL and cyber claims in one place, while its E&O form is placed with unaffiliated insurers and the current product page does not name the issuer. Aon also does not identify the carrier for a particular placement. Coalition’s add-on route uses a few extra application questions; Aon describes advisor-led placement. Compare the policy limits, state availability and whether cyber and E&O claims share any aggregate. [1] [2]

What Should You Confirm in Aon and Coalition Professional Liability (E&O) Insurance Quotes?

  • Ask Coalition which insurer issues MPL and whether it is available without buying Active Cyber. [1] [2]
  • Ask Aon for the application route, insurer and how E&O claims coordinate with cyber coverage. [1] [2]

Areas of coverage

Aon

  • role: Aon presents Professional Liability / E&O 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. Aon’s global professional-services practice page. This establishes a marketed brokerage/advisory offering, not policy issuance or account-specific placement.company-reportedSource ↗
  • eligibility: 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. Audience described for Aon’s global professional-services practice. It does not establish U.S. state availability or underwriting eligibility for a placement.company-reportedSource ↗
  • coverage: Aon describes professional liability as addressing professional-services firms’ liability exposure and says it tailors coverage structures to a firm’s needs. It identifies E&O as a commonly used name for professional-liability insurance; actual policy terms are not stated. 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.company-reportedSource ↗
  • 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. Company-reported advisory services on Aon’s global practice page; account-specific service scope is not stated.company-reportedSource ↗
  • 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. 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.not-foundSource ↗
  • limits: 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. Aon’s global practice page as reviewed 2026-09-30; no quote, bond form or issued policy was reviewed.not-disclosedSource ↗

Coalition

  • role: Coalition designs and distributes MPL as an add-on coverage that combines with certain Active Cyber Insurance policies, sold through appointed brokers. Miscellaneous Professional Liability product page as read on 2026-09-23.company-reportedSource ↗
  • eligibility: Coalition markets MPL to any business that performs professional services, naming examples such as consultants, marketing and PR firms, staffing firms, printers, interior decorators, photographers and videographers, and property managers. Miscellaneous Professional Liability product page as read on 2026-09-23.company-reportedSource ↗
  • coverage: Coalition says MPL covers defense costs, settlements, judgments, and other expenses from claims of errors and omissions in professional services, including negligence, failure to provide service, and misstatements about the service performed, on a duty-to-defend basis even when the business is not ultimately at fault. Miscellaneous Professional Liability product page as read on 2026-09-23; the issued policy controls actual terms.company-reportedSource ↗
  • insurer: Coalition's disclaimer page has named sections for admitted cyber, non-admitted cyber, and admitted executive risk, but no equivalent 'Admitted MPL' section, indicating MPL is placed on a non-admitted (surplus lines) basis with unaffiliated insurers the disclaimer does not name. U.S. Disclaimers page as read on 2026-09-23; the buyer's declarations page names the actual issuing insurer.not-disclosedSource ↗
  • application: Coalition sells MPL only as an addition to an Active Cyber Insurance quote, saying it takes just a few extra questions to add, rather than as a stand-alone policy. Miscellaneous Professional Liability product page as read on 2026-09-23.company-reportedSource ↗
  • claims: Coalition says its in-house claims team manages both MPL and cyber claims in one place, which it describes as a smoother, more coordinated process for the policyholder. Miscellaneous Professional Liability product page as read on 2026-09-23; speed and efficiency descriptions are company-reported and not independently verified.company-reportedSource ↗

Sources reviewed

  1. 01
    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

  2. 02
    Miscellaneous Professional Liability

    Coalition · Why Miscellaneous Professional Liability?; MPL Advantage; What does MPL cover?; What types of claims does MPL protect against?; What types of businesses could benefit from MPL?; Why does 'Duty to Defend' coverage matter? · accessed 2026-09-23

  3. 03
    U.S. Disclaimers

    Coalition · Non-Admitted Cyber; Admitted Cyber; Admitted Executive Risk (names Zurich American Insurance Company, NAIC 16535); no 'Admitted MPL' or 'Admitted Tech E&O' section appears on the page · accessed 2026-09-23

  4. 04
    Professional Liability – US Direct Errors and Omissions Insurance

    Hiscox Inc. specimen · About this Policy / Coverage for Claims Made Against You; I.A Insuring Agreement; I.B Defense; I.C Settlement; II.A Notice of Claims; II.C Optional Extended Reporting Period; III.A, III.K, III.M, III.R, III.S Exclusions; IV.A–B Limits and Deductible; VI.O Professional Services; VI.U Wrongful Act · accessed 2026-09-16

  5. 05
    Professional liability insurance

    Insurance Information Institute · Opening paragraphs (professional services/advice and E&O name); Claims not covered by general liability; What types of businesses need professional liability insurance?; What’s covered… and what’s not (claims-made versus occurrence, defense and judgments, non-financial/intentional limits, BOP/in-home exclusion) · accessed 2026-09-16

  6. 06
    FAQ: Professional liability insurance

    Texas Department of Insurance · What’s professional liability coverage?; What types of damages…; What’s general liability insurance?; Do I need professional liability… if I have general liability…?; Is professional liability insurance required?; Can a client require…?; What’s the difference between occurrence policies and claims-made policies · accessed 2026-09-16

  7. 07
    Get business insurance

    U.S. Small Business Administration · Six common types of business insurance table · accessed 2026-09-16

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