Insureon vs 
Marsh McLennan Agency: How Do They Compare for Professional Liability (E&O) Insurance?
What is Insureon?
Insureon describes a small-business insurance agency and broker route with online quote entry and agent support. Its pages market several coverage types, but do not establish which insurer, policy form, state availability, or eligibility applies to a particular buyer. 1,2
Read the Insureon Professional Liability (E&O) Insurance page
What Is Marsh McLennan Agency?
Marsh McLennan Agency provides business insurance and employee health and benefits, alongside retirement, wealth, and private-client services across the United States and Canada. Its US small-business page lists six common coverage types and directs buyers to request a personalized quote by phone; the insurer and terms for a specific placement must be confirmed in the proposal. 4,5
Read the Marsh McLennan Agency profile
Read the Marsh McLennan Agency Professional Liability (E&O) Insurance page
What Is Professional Errors and Omissions (E&O) Insurance?
Professional liability can help pay defense costs and covered losses when a client says your advice or service caused financial harm. If customers rely on your work, list every service you provide and check the claims-made reporting and prior-work terms. 7,8,9,10
Key Differences in Professional Liability (E&O) Insurance
When a Specialist Form Applies
Marsh McLennan Agency’s reviewed page presents professional liability as a set of placements and names specialist lines for architects and engineers and lawyers rather than one universal form. Insureon describes E&O for service businesses, with specific professions and carrier appetite determined through the application. A licensed firm should ask whether a specialty form is required; a company with several professional services should have Insureon identify how the carrier classifies each one. 6 3
Profession-Specific Wording
The Marsh McLennan Agency overview describes E&O and those named specialist lines but does not treat them as a single form or set universal terms. Insureon’s overview also leaves detailed terms to the quote. Ask each adviser which professional-services definition and policy wording is proposed for your profession, and whether a separate specialty policy is needed. 6 3
Adviser-Led Placement
Marsh McLennan Agency invites organizations to contact an adviser or specialist, while Insureon offers an online quote request. Neither reviewed page publishes universal limits or an issuing insurer for a particular account. Compare named insurers, forms, limits, retentions, and exclusions in the actual proposals. 6 3
What to Confirm in Professional Liability (E&O) Insurance Quotes
Insureon and Marsh McLennan Agency Review Scores for 2026
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.
Insureon Review Score
Review Score
4 rated sources
Insureon's ratings are split. Trustpilot shows 4.5 out of 5 from 2,401 reviews, while ConsumerAffairs shows 1.0 from 344.[1][2]
Read Insureon reviewsMarsh McLennan Agency Review Score
Review Score
2 rated sources
There are almost no public customer reviews of Marsh McLennan Agency (MMA). Trustpilot shows 3.2 out of 5, but from a single review, and BBB shows an A grade with four complaints closed in three years.[8][9][1]
Read Marsh McLennan Agency reviewsInsureon vs Marsh McLennan Agency Professional Liability (E&O) Compared
Insureon vs Marsh McLennan Agency: Professional Liability (E&O) Insurance: documented features by provider
| Criteria | Insureon Professional Liability / E&O Insurance | Marsh McLennan Agency professional errors omissions (official overview) |
|---|---|---|
| Role in This Line | Insureon markets Professional Liability, also called Errors & Omissions, through its small-business quote channel. 3Company-reported. Insureon’s public marketing page and quote route documents this description. It does not establish the issuing insurer for an individual quote, exact state or provincial availability, the policy form, complete exclusions, or terms offered to a particular buyer; confirm those in the quote and policy documents. | Marsh McLennan Agency describes arranging professional errors omissions for the audience stated on the cited product page. 6Company-reported. professional errors omissions marketed by marsh-mclennan-agency; scope is limited to the cited official product overview and described audience. This is not a policy form or a universal eligibility statement. |
| Who It’s For | The page addresses service businesses exposed to client claims; the eligible professions and carrier appetite depend on the application and quote. 3Company-reported. Insureon’s public marketing page and quote route documents this description. It does not establish the issuing insurer for an individual quote, exact state or provincial availability, the policy form, complete exclusions, or terms offered to a particular buyer; confirm those in the quote and policy documents. | Organizations seeking professional liability placement; source does not imply all professions share one policy. 6Company-reported. professional errors omissions marketed by marsh-mclennan-agency; 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 | The page describes client claims over alleged mistakes or unsatisfactory professional work; it does not establish policy-specific retroactive dates, exclusions or limits. 3Company-reported. Insureon’s public marketing page and quote route documents this description. It does not establish the issuing insurer for an individual quote, exact state or provincial availability, the policy form, complete exclusions, or terms offered to a particular buyer; confirm those in the quote and policy documents. | The cited product page describes E&O and named specialist professional lines, including architects and engineers and lawyers professional liability; the overview does not treat them as one form. Marketing description only; actual coverage, exclusions, conditions, limits, and availability depend on the issued policy and jurisdiction. 6Company-reported. professional errors omissions marketed by marsh-mclennan-agency; 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 cited public overview does not establish the limits, deductibles, exclusions or form terms that would apply to a specific buyer. 3Not publicly disclosed. Ask for the quote and specimen or issued policy forms before treating a listed feature as covered. | 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. 6Not publicly disclosed. Only the cited marketing page was reviewed for published limit and retention information; no policy-form entitlement is inferred. |
| How to Apply | The cited Insureon product page provides an online quote request path; that route does not identify the insurer or guarantee that a quote will be offered or bound. 3Company-reported. Insureon’s public marketing page and quote route documents this description. It does not establish the issuing insurer for an individual quote, exact state or provincial availability, the policy form, complete exclusions, or terms offered to a particular buyer; confirm those in the quote and policy documents. | The page invites organizations to contact a Marsh McLennan Agency adviser or specialist to discuss placement. The page does not establish a quote, bind, or coverage-effective timeline. 6Company-reported. professional errors omissions marketed by marsh-mclennan-agency; scope is limited to the cited official product overview and described audience. This is not a policy form or a universal eligibility statement. |
Related Pages for Insureon vs Marsh McLennan Agency
Professional Liability (E&O) Pages for Insureon and Marsh McLennan Agency
Other Coverage Lines Compared for Insureon vs Marsh McLennan Agency
Other Professional Liability (E&O) Insurance Provider Comparisons
Sources for Insureon vs Marsh McLennan Agency
Sources About Insureon
- How Insureon Works. Insureon; Agent/broker and carrier roles (L82-88); application and advertised quote/payment route (L89-97); human support (L98-101). Accessed 2026-09-28.
- General Liability Insurance - Get Online Quotes. Insureon; Coverage/product overview; illustrative third-party claims; quote CTA. Accessed 2026-09-29.
- Professional Liability Insurance - Get Online Quotes. Insureon; Product definition L67-L89; quote CTA and target users on page. Accessed 2026-09-29.
Sources About Marsh McLennan Agency
- Who We Are. Marsh McLennan Agency; Lines 193-195: ‘a business of Marsh’ and company-listed service lines across US and Canada. This does not establish the legal entity for an account, corporate ownership chart, or insurer role. Accessed 2026-09-29.
- Small Business Insurance Solutions. Marsh McLennan Agency; Lines 205-207: small-business audience and call invitation; lines 224-249 list six coverage categories and short descriptions; line 264 is an embedded form whose function is not stated. No form submitted. Accessed 2026-09-29.
- Executive and Professional Liability | MMA. Marsh McLennan Agency; E&O, architects and engineers, and lawyers professional lines are named in the policy suite. Accessed 2026-09-30.
Sources for the Professional Liability (E&O) Insurance Guide
- 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.
- 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.
- Get business insurance. U.S. Small Business Administration; Six common types of business insurance table. Accessed 2026-09-16.
- 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.
