Aon vs Gallagher: Professional Liability / E&O Insurance

Gallagher Small Business takes E&O quotes by online form, advisor phone line or callback for small firms, while Aon puts its brokerage and advisory effort toward law, accounting and consulting firms.

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

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

Coverage and Policy Design

Aon says it tailors professional-liability structures for law, accounting and consulting firms but does not list policy triggers. Gallagher arranges E&O with partner carriers and says it can address negligence, personal injury, copyright infringement, punitive damages, and claims involving past work, temporary staff or contractors. Those examples give service businesses concrete wording to check against the policy, although Gallagher’s page does not name the issuing insurer. [1] [2]

Buying Route and Terms

Gallagher recommends E&O for service businesses across technology, accounting, tax, healthcare, legal and other professions, and provides an online form, advisor phone line and callback option. Aon names a narrower professional-services audience and describes advisory placement. Neither reviewed record publishes limits or deductibles. Gallagher says insurers are selective and may request detailed underwriting information, so prepare operational and claims details before comparing quote timing and terms. [1] [2]

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

  • Ask Gallagher which listed claim categories are included by the carrier and what limits and deductible apply. [1] [2]
  • Ask Aon about eligible professions, underwriting information and the quote route for your firm. [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 ↗

Gallagher

  • role: Gallagher Small Business arranges errors and omissions (E&O) coverage with partner carriers rather than underwriting the policy itself. Gallagher Small Business's direct-to-small-business E&O product page.company-reportedSource ↗
  • coverage: Gallagher describes E&O as protecting against client charges of negligence or injury tied to professional services, covering losses, attorney fees and court costs regardless of fault, and specifically responding to alleged or actual negligence, personal injury, copyright infringement, punitive damages, and claims against past work, temporary staff or independent contractors. Product page coverage description; the issued policy and its exclusions control. Note this record excludes medical malpractice, which the page treats as a separate specialized coverage covered under its own line.company-reportedSource ↗
  • eligibility: Gallagher recommends E&O for small businesses that provide a specific professional service, naming technology, insurance, accounting, tax, wealth management and legal services, and lists doctors, lawyers, accountants, nurses, caregivers, counselors, social workers and engineers as example professionals; it also notes that many client contracts require carrying E&O. Product page eligibility and recommended-professions lists; actual acceptance depends on underwriting.company-reportedSource ↗
  • coverage: Gallagher's small-business team says the E&O market has seen consistent rate increases that have started to moderate, driven by higher claim frequency, litigation costs and a more litigious environment, and that insurers are more selective and require more detailed underwriting information. Product page market-commentary section; a general market view, not a quote for any specific business.company-reportedSource ↗
  • insurer: The E&O product page does not name the insurer that would issue a given business's policy. Checked the E&O product page on 2026-09-23.not-disclosedSource ↗
  • limits: The E&O product page does not publish limits, deductibles or premiums; it directs prospective buyers to request a quote instead. Checked the E&O product page on 2026-09-23.not-disclosedSource ↗
  • application: Gallagher offers an online quote form, a small business advisor phone line (1-833-292-9441, Monday through Friday, 8 a.m. to 5 p.m., continental U.S.), and a scheduled callback request to start an E&O quote. Product page "Get Covered Now" section.company-reportedSource ↗

Aon describes tailored E&O structures through a professional-services practice. Gallagher Small Business lists negligence, copyright and past-work allegations and offers multiple quote routes.

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
    Errors and Omissions Insurance

    Gallagher Small Business · What is Errors and Omissions Insurance?; Do you need Errors and Omissions insurance?; Recommended for professionals including; E&O trends; An E&O policy protects you from; Consider this claim scenario; Get Covered Now · accessed 2026-09-23

  3. 03
    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

  4. 04
    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

  5. 05
    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

  6. 06
    Get business insurance

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

Ask Kearny Risk to help relate this comparison to your services and contracts.

Contact Kearny Risk