Marsh vs 
Nationwide: 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 Nationwide?
Nationwide’s commercial catalogue includes common small-business policies and separate specialty products. A catalogue listing does not establish eligibility or policy terms; confirm the issuing company and coverage for your state and business. 7,8,9
Read the Nationwide 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. 11,12,13,14
Key Differences in Professional Liability (E&O) Insurance
Specialized Industries and Coverage Review
Marsh names banking, broker-dealers, insurance, asset management, venture capital, accounting, law, architecture, technology, media, healthcare and biotechnology among the industries its professional-liability experts serve. It says its teams include attorneys, economists and actuaries alongside coverage specialists to assess exposure. Nationwide describes E&O for professionals providing services but its overview does not enumerate similar specialty sectors or multidisciplinary review. A complex or regulated business can ask Marsh which team will assess its services and ask Nationwide’s agent which underwriting class applies. 5 10
Potential Privacy and Cyber Claims
Marsh says professional-liability coverage can address liability and defense costs from alleged errors, omissions or negligence, and that many policies also cover privacy violations and computer-security breaches. Nationwide’s overview describes E&O for professional-service errors but does not discuss privacy or cyber claims. Buyers should check whether those exposures sit inside the E&O form, require an endorsement or need separate cyber coverage. 5 10
What to Confirm in Professional Liability (E&O) Insurance Quotes
- Ask Marsh which professional services, privacy violations and security incidents fall within the quoted policy and what limits apply. 5
- Ask Nationwide’s agent for the professional-services definition and whether the proposal includes privacy or cyber claims. 10
- Confirm whether an attorney, economist, actuary or coverage specialist will review the risk and which insurer issues the policy. 5
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.
Marsh
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 reviewsNationwide
Review Score
4 rated sources
Experts like Nationwide more than customers do. NerdWallet gives it 4.5 out of 5 for business insurance, while small-business customers on ConsumerAffairs give it 2.5 out of 5 from 19 reviews.[1][10]
Read Nationwide reviewsOffering Details
Marsh vs Nationwide: Professional Liability (E&O) Insurance: documented features by provider
| Criteria | Marsh Professional Liability Insurance Brokerage | Nationwide 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. | Nationwide describes offering professional errors omissions for the audience stated on the cited product page. 10Company-reported. professional errors omissions marketed by nationwide; 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. | Professionals and businesses providing services to others as described by Nationwide; exact eligible classes depend on underwriting. 10Company-reported. professional errors omissions marketed by nationwide; 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 insurance for claims alleging errors or omissions in professional services, as described on Nationwide's product page. Marketing description only; actual coverage, exclusions, conditions, limits, and availability depend on the issued policy and jurisdiction. 10Company-reported. professional errors omissions marketed by nationwide; 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. 10Not 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 directs prospective customers to contact an agent or request a quote. The page does not establish a quote, bind, or coverage-effective timeline. 10Company-reported. professional errors omissions marketed by nationwide; scope is limited to the cited official product overview and described audience. This is not a policy form or a universal eligibility statement. |
Full Comparison
More Marsh vs Nationwide Comparisons
Other Professional Liability (E&O) Insurance Comparisons
Sources
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.
Nationwide
- Small Business Insurance. Nationwide; Small business products and solutions, lines 185–214: BOP, workers’ compensation, commercial auto, umbrella, EPLI, cyber and surety; purchase guidance lines 235–247. Accessed 2026-09-29.
- Small Business Insurance Solutions for Agents. Nationwide; Specialized small commercial solutions: BOP, auto, workers’ compensation, cyber, EPLI, umbrella, inland marine and professional liability; page states appetite varies by state, lines 129–163, 191–193. Accessed 2026-09-29.
- Terms and Conditions for Nationwide.com. Nationwide; P&C products not offered by all companies/states; policy/declarations control; NMI and affiliates may underwrite; each underwriter responsible for own products, lines 358–368 and 391–394. Accessed 2026-09-29.
- Errors and Omissions Insurance. Nationwide; E&O page; professional-services liability and coverage overview. Accessed 2026-09-30.
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.
