Marsh vs 
Marsh McLennan Agency: How Do They Compare for Professional Liability (E&O) Insurance?
What Is Marsh?
Marsh suits technology and larger businesses seeking specialist cyber placement or broad global risk advice; small firms wanting a quick standard quote should compare its MMA route or digital agencies. 1,2,3,4
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. 7,8
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. 10,11,12,13
Key Differences in Professional Liability (E&O) Insurance
Coverage Detail in the Published Overviews
Marsh describes professional liability for errors, omissions, or negligence and says many policies also cover privacy violations and computer-security breaches. Marsh McLennan Agency names E&O plus distinct architects-and-engineers and lawyers professional liability lines, but its overview does not spell out those extensions. That difference matters if a client allegation could involve both professional work and a privacy or security incident: ask Marsh whether the extension applies to the proposed form, and ask MMA whether the relevant policy includes it rather than assuming the line label settles the question. 5 9
Industry Focus and Specialist Support
Marsh lists professional-liability expertise across financial services, accounting, legal, architecture and engineering, media, technology, healthcare, and biotechnology. Its described team includes attorneys, economists, actuaries, and coverage specialists to assess exposure. MMA also names architects-and-engineers and lawyers lines and describes arranging placements for organizations, but its cited overview does not set out the same industry list or team disciplines. If you need a narrow specialty, compare the people and placement experience assigned to your account, not just the shared E&O label. 5 9
What to Confirm in Professional Liability (E&O) Insurance Quotes
Marsh 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.
Marsh Review Score
Review Score
2 rated sources
Marsh’s global Trustpilot profile has a poor 1.3/5 score. Treat it as a service warning to investigate with your proposed team; it does not isolate US commercial accounts.[2][4][7]
Read Marsh 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 reviewsMarsh vs Marsh McLennan Agency Professional Liability (E&O) Compared
Marsh vs Marsh McLennan Agency: Professional Liability (E&O) Insurance: documented features by provider
| Criteria | Marsh Professional Liability Insurance Brokerage | Marsh McLennan Agency professional errors omissions (official overview) |
|---|---|---|
| Role in This Line | Marsh's financial and professional liability practice places professional liability (errors and omissions) insurance; MMA also places E&O coverage within its executive and professional liability practice for middle-market clients. 5,6Company-reported. Marsh professional liability page and MMA executive and professional liability page. | Marsh McLennan Agency describes arranging professional errors omissions for the audience stated on the cited product page. 9Company-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. |
| Issuing Insurer | The reviewed pages do not name a specific professional liability insurer. 5,6Not publicly disclosed. Marsh professional liability page and MMA executive and professional liability page as read on 2026-09-23. | Confirm in your quote. |
| Who It’s For | Marsh names specialized industries its professional liability experts serve, including banking and broker/dealers, insurance companies and asset managers, merchant banking and venture capital, accountants, attorneys, architects and engineers, media and entertainment, technology, and healthcare and biotechnology. 5Company-reported. Marsh professional liability page, What We Offer section. | Organizations seeking professional liability placement; source does not imply all professions share one policy. 9Company-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 | Marsh says professional liability coverage can protect a company against liability and defense costs from a claim alleging an error, omission or negligence in performing professional services, and that many policies also cover privacy violations and computer security breaches. 5Company-reported. Marsh professional liability page opening description; illustrative policy description, not a specific policy form. | 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. 9Company-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 | Confirm in your quote. | 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. 9Not publicly disclosed. Only the cited marketing page was reviewed for published limit and retention information; no policy-form entitlement is inferred. |
| Risk Services | Marsh says it employs attorneys, economists and actuaries alongside coverage specialists to assess a client's professional liability exposure from multiple angles, given the complexity of these risks. 5Company-reported. Marsh professional liability page. | Confirm in your quote. |
| How to Apply | Confirm in your quote. | 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. 9Company-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 Marsh vs Marsh McLennan Agency
Professional Liability (E&O) Pages for Marsh and Marsh McLennan Agency
Other Coverage Lines Compared for Marsh vs Marsh McLennan Agency
Other Professional Liability (E&O) Insurance Provider Comparisons
Sources for Marsh vs Marsh McLennan Agency
Sources About Marsh
- Marsh | Leader in risk, strategy, people, and investments. Marsh; Hero and capability tiles; FAQ: What does Marsh do?; industries served; Is Marsh the same as Marsh McLennan? January 2026 brand change. Accessed 2026-09-16.
- Compensation guide for US clients. Marsh; US broking segments; broker role; retail commissions, client fees, wholesale, insurer consulting, contingent and supplemental commissions; Marsh LLC and Marsh USA LLC; page 3: broker role and Marsh & McLennan Agency segment; page 7: copyright © 2024 Marsh LLC. Accessed 2026-09-16.
- Marsh McLennan Agency (MMA). Marsh; Middle-market US organizations; wholly-owned subsidiary; business insurance, employee health and benefits, retirement, private client. Accessed 2026-09-16.
- Technology | Insurance Broking & Risk Management. Marsh; Opening Technology Practice description; practice links including data center insurance, fintech and Stratus; Talk to us. Accessed 2026-09-16.
- Professional liability. Marsh; Opening description; What We Offer: specialized industries served (banking, insurance/asset managers, merchant banking/venture capital, accountants/attorneys/architects/engineers, media/communications/entertainment, technology, healthcare/biotechnology). Accessed 2026-09-23.
- Expert Executive and Professional Liability Insurance. Marsh McLennan Agency; Our policies include D&O, E&O, EPL, commercial crime/fidelity, network security privacy risk/cyber, fiduciary, media liability, IP, architects and engineers, lawyers professional, and kidnap and ransom. Accessed 2026-09-23.
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.
