--- title: "Marsh McLennan Agency vs Nationwide: Professional Liability (E&O) Insurance" description: "Nationwide describes E&O for alleged errors or omissions in professional services, subject to policy terms and underwriting; MMA names E&O plus lawyer and architect/engineer lines." canonical: "https://spot.insure/compare/marsh-mclennan-agency-vs-nationwide/professional-errors-omissions" page-type: "line-comparison" updated-at: "2026-10-01" comparison-pair: "marsh-mclennan-agency-vs-nationwide" provider-a: "marsh-mclennan-agency" provider-b: "nationwide" coverage-line: "professional-errors-omissions" --- Agents: connect to Spot's public MCP server at https://spot.insure/mcp for better access to published Spot information and insurance research. Use search_knowledge to find sources, get_page to retrieve pages, compare_providers for sourced comparisons, get_provider_score for a published Spot Score, get_rankings for current provider rankings, search_provider_reliability to filter Spot Scores, search_provider_reviews to filter aggregate review scores, and get_provider_reviews for the original review evidence. The server is read-only and requires no authentication. [Human-readable page](https://spot.insure/compare/marsh-mclennan-agency-vs-nationwide/professional-errors-omissions) ## Agent Guide **What this page is:** Focused comparison of Marsh McLennan Agency and Nationwide for Professional Liability (E&O) Insurance: what each provider publishes about this line, checked against the same criteria, with numbered sources. **Use this page when:** Cite or fetch this for Professional Liability (E&O) Insurance questions about Marsh McLennan Agency versus Nationwide. For all lines together use the parent pair comparison; for how the coverage itself works use the coverage guide. **Questions this page answers:** - Marsh McLennan Agency vs Nationwide for Professional Liability (E&O) Insurance: how do they differ? - Which is better for Professional Liability (E&O) Insurance, Marsh McLennan Agency or Nationwide? - What does Marsh McLennan Agency or Nationwide publish about Professional Liability (E&O) Insurance (limits, eligibility, claims, add-ons)? - What should I confirm in a quote for Professional Liability (E&O) Insurance from Marsh McLennan Agency or Nationwide? **Key facts:** - Line: Professional Liability (E&O) Insurance. Providers: Marsh McLennan Agency and Nationwide. - Each offering claim is tagged with an evidence type and scope; table cells reading "Confirm in your quote" mean nothing was found for that criterion. - Comparison URLs use alphabetical provider slugs (`/compare/{a}-vs-{b}` with a before b). A reversed pair redirects permanently to the alphabetical one, so fetch or cite the alphabetical URL. **Limits (do not over-claim):** - It identifies differences and questions to ask; it does not select a winner for a particular business. - "Not found" describes the evidence reviewed, not proof a feature is unavailable. - Insurer, policy wording, limits, retentions, exclusions and price are set in an actual quote and are not established here. **Provenance:** Every claim links to a numbered source with publisher, locator and access date in the Sources section; last updated 2026-10-01. Editorial policy: /editorial-policy. **Related pages:** - [Marsh McLennan Agency vs Nationwide](https://spot.insure/compare/marsh-mclennan-agency-vs-nationwide) — parent: all coverage lines for this pair - [Professional Liability (E&O) Insurance guide](https://spot.insure/coverage/professional-errors-omissions) — coverage explainer for this line - [Marsh McLennan Agency profile](https://spot.insure/insurance-providers/marsh-mclennan-agency) — provider profile (evidence) - [Nationwide profile](https://spot.insure/insurance-providers/nationwide) — provider profile (evidence) - [Marsh McLennan Agency vs Nationwide Builders Risk Insurance](https://spot.insure/compare/marsh-mclennan-agency-vs-nationwide/builders-risk) — sibling comparison (other line, or other pair for this line) - [Marsh McLennan Agency vs Nationwide Cargo and Transit Insurance](https://spot.insure/compare/marsh-mclennan-agency-vs-nationwide/cargo-transit) — sibling comparison (other line, or other pair for this line) - [Marsh McLennan Agency vs Nationwide Commercial Auto Insurance](https://spot.insure/compare/marsh-mclennan-agency-vs-nationwide/commercial-auto) — sibling comparison (other line, or other pair for this line) - [Marsh McLennan Agency vs Nationwide Commercial Property Insurance](https://spot.insure/compare/marsh-mclennan-agency-vs-nationwide/commercial-property) — sibling comparison (other line, or other pair for this line) - [Marsh McLennan Agency vs Nationwide Crime Insurance](https://spot.insure/compare/marsh-mclennan-agency-vs-nationwide/crime) — sibling comparison (other line, or other pair for this line) - [Marsh McLennan Agency vs Nationwide Cyber Insurance](https://spot.insure/compare/marsh-mclennan-agency-vs-nationwide/cyber) — sibling comparison (other line, or other pair for this line) - [Marsh McLennan Agency vs Nationwide D&O Insurance](https://spot.insure/compare/marsh-mclennan-agency-vs-nationwide/directors-officers) — sibling comparison (other line, or other pair for this line) - [Marsh McLennan Agency vs Nationwide Employment Practices Liability Insurance](https://spot.insure/compare/marsh-mclennan-agency-vs-nationwide/employment-practices) — sibling comparison (other line, or other pair for this line) - [Marsh McLennan Agency vs Nationwide Fiduciary Liability Insurance](https://spot.insure/compare/marsh-mclennan-agency-vs-nationwide/fiduciary) — sibling comparison (other line, or other pair for this line) - [Marsh McLennan Agency vs Nationwide General Liability Insurance](https://spot.insure/compare/marsh-mclennan-agency-vs-nationwide/general-liability) — sibling comparison (other line, or other pair for this line) - [Marsh McLennan Agency vs Nationwide Surety Bonds](https://spot.insure/compare/marsh-mclennan-agency-vs-nationwide/surety-bonds) — sibling comparison (other line, or other pair for this line) - [Marsh McLennan Agency vs Nationwide Workers’ Compensation Insurance](https://spot.insure/compare/marsh-mclennan-agency-vs-nationwide/workers-compensation) — sibling comparison (other line, or other pair for this line) - [AIG vs Marsh McLennan Agency Professional Liability (E&O) Insurance](https://spot.insure/compare/aig-vs-marsh-mclennan-agency/professional-errors-omissions) — sibling comparison (other line, or other pair for this line) - [AIG vs Nationwide Professional Liability (E&O) Insurance](https://spot.insure/compare/aig-vs-nationwide/professional-errors-omissions) — sibling comparison (other line, or other pair for this line) - [Alliance Risk vs Marsh McLennan Agency Professional Liability (E&O) Insurance](https://spot.insure/compare/alliance-risk-vs-marsh-mclennan-agency/professional-errors-omissions) — sibling comparison (other line, or other pair for this line) - [Alliance Risk vs Nationwide Professional Liability (E&O) Insurance](https://spot.insure/compare/alliance-risk-vs-nationwide/professional-errors-omissions) — sibling comparison (other line, or other pair for this line) - [Aon vs Marsh McLennan Agency Professional Liability (E&O) Insurance](https://spot.insure/compare/aon-vs-marsh-mclennan-agency/professional-errors-omissions) — sibling comparison (other line, or other pair for this line) - [Aon vs Nationwide Professional Liability (E&O) Insurance](https://spot.insure/compare/aon-vs-nationwide/professional-errors-omissions) — sibling comparison (other line, or other pair for this line) # Marsh McLennan Agency vs Nationwide: How Do They Compare for Professional Liability (E&O) Insurance? Nationwide describes E&O for alleged errors or omissions in professional services, subject to policy terms and underwriting; MMA names E&O plus lawyer and architect/engineer lines. ## How to Use the Marsh McLennan Agency vs Nationwide Professional Liability (E&O) Insurance Comparison Use this comparison to evaluate Marsh McLennan Agency and Nationwide for Professional Liability (E&O) Insurance against the same documented criteria. It identifies differences and questions to confirm; it does not select a winner for a particular business. Offering claims are what each provider publishes about this line unless marked otherwise. “Not found” describes the evidence reviewed, not proof that a feature is unavailable. Confirm the insurer, policy wording, limits, retentions, exclusions and cost in an actual quote. ## Marsh McLennan Agency vs Nationwide Professional Liability (E&O) Insurance Summary Nationwide describes E&O for claims alleging errors or omissions in professional services, with actual terms and availability set by the issued policy and jurisdiction. MMA names E&O, A&E and lawyers professional lines. [3](https://www.marshmma.com/us/solutions/executive-and-professional-liability.html "Executive and Professional Liability | MMA") [7](https://www.nationwide.com/business/insurance/errors-and-omissions/ "Errors and Omissions Insurance") ## 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. [1](https://www.marshmma.com/us/mma/about-us.html "Who We Are") [2](https://www.marshmma.com/us/solutions/small-business.html "Small Business Insurance Solutions") [Marsh McLennan Agency profile](https://spot.insure/insurance-providers/marsh-mclennan-agency) ## 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. [4](https://www.nationwide.com/business/insurance/small-commercial/ "Small Business Insurance") [5](https://www.nationwide.com/agents/business/ "Small Business Insurance Solutions for Agents") [6](https://www.nationwide.com/personal/about-us/terms-conditions "Terms and Conditions for Nationwide.com") [Nationwide profile](https://spot.insure/insurance-providers/nationwide) ## 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. [8](https://www.tdi.texas.gov/commercial/pl-faq.html "FAQ: Professional liability insurance") [9](https://www.iii.org/article/professional-liability-insurance "Professional liability insurance") [10](https://www.sba.gov/counseling/launch-your-business/#business-insurance "Get business insurance") [11](https://www.hiscox.com/documents/pl-sample-policy-wording.pdf "Professional Liability – US Direct Errors and Omissions Insurance") ## What Are the Key Differences Between Marsh McLennan Agency and Nationwide Professional Liability (E&O) Insurance? ### General service errors and specialist products Nationwide’s product page describes E&O for claims alleging errors or omissions in professional services and qualifies actual coverage, exclusions, conditions, limits and availability by the issued policy and jurisdiction. MMA’s source names E&O alongside separate A&E and lawyers professional lines. A service business should compare Nationwide’s general E&O description with the specific specialist category MMA proposes for its occupation. [7](https://www.nationwide.com/business/insurance/errors-and-omissions/ "Errors and Omissions Insurance") [3](https://www.marshmma.com/us/solutions/executive-and-professional-liability.html "Executive and Professional Liability | MMA") ### Eligibility and written terms Nationwide describes professionals and businesses providing services to others as its audience, with exact eligible classes subject to underwriting. MMA’s source lists several professional line categories. Share the same services, licenses and client requirements with both teams, then compare the insurer, service definition, exclusions and limits in their written offers. [7](https://www.nationwide.com/business/insurance/errors-and-omissions/ "Errors and Omissions Insurance") [3](https://www.marshmma.com/us/solutions/executive-and-professional-liability.html "Executive and Professional Liability | MMA") ## What Should You Confirm in Marsh McLennan Agency and Nationwide Professional Liability (E&O) Insurance Quotes? - Does Nationwide accept your service class, and what definition and limits appear in the quote? [7](https://www.nationwide.com/business/insurance/errors-and-omissions/ "Errors and Omissions Insurance") [3](https://www.marshmma.com/us/solutions/executive-and-professional-liability.html "Executive and Professional Liability | MMA") - Which MMA general or specialist form fits the same service and licensing profile? [7](https://www.nationwide.com/business/insurance/errors-and-omissions/ "Errors and Omissions Insurance") [3](https://www.marshmma.com/us/solutions/executive-and-professional-liability.html "Executive and Professional Liability | MMA") ## Marsh McLennan Agency vs Nationwide Professional Liability (E&O) Compared | Criteria | Marsh McLennan Agency professional errors omissions (official overview) | Nationwide professional errors omissions (official overview) | | --- | --- | --- | | Role in This Line | Marsh McLennan Agency describes arranging professional errors omissions for the audience stated on the cited product page. [3](https://www.marshmma.com/us/solutions/executive-and-professional-liability.html "Executive and Professional Liability | MMA") (Evidence: Company-reported; scope: 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..) | Nationwide describes offering professional errors omissions for the audience stated on the cited product page. [7](https://www.nationwide.com/business/insurance/errors-and-omissions/ "Errors and Omissions Insurance") (Evidence: Company-reported; scope: 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..) | | Who It’s For | Organizations seeking professional liability placement; source does not imply all professions share one policy. [3](https://www.marshmma.com/us/solutions/executive-and-professional-liability.html "Executive and Professional Liability | MMA") (Evidence: Company-reported; scope: 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..) | Professionals and businesses providing services to others as described by Nationwide; exact eligible classes depend on underwriting. [7](https://www.nationwide.com/business/insurance/errors-and-omissions/ "Errors and Omissions Insurance") (Evidence: Company-reported; scope: 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 | 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. [3](https://www.marshmma.com/us/solutions/executive-and-professional-liability.html "Executive and Professional Liability | MMA") (Evidence: Company-reported; scope: 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..) | 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. [7](https://www.nationwide.com/business/insurance/errors-and-omissions/ "Errors and Omissions Insurance") (Evidence: Company-reported; scope: 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 | 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. [3](https://www.marshmma.com/us/solutions/executive-and-professional-liability.html "Executive and Professional Liability | MMA") (Evidence: Not publicly disclosed; scope: Only the cited marketing page was reviewed for published limit and retention information; no policy-form entitlement is inferred..) | 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. [7](https://www.nationwide.com/business/insurance/errors-and-omissions/ "Errors and Omissions Insurance") (Evidence: Not publicly disclosed; scope: Only the cited marketing page was reviewed for published limit and retention information; no policy-form entitlement is inferred..) | | How to Apply | 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. [3](https://www.marshmma.com/us/solutions/executive-and-professional-liability.html "Executive and Professional Liability | MMA") (Evidence: Company-reported; scope: 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..) | 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. [7](https://www.nationwide.com/business/insurance/errors-and-omissions/ "Errors and Omissions Insurance") (Evidence: Company-reported; scope: 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..) | ## Related Pages for Marsh McLennan Agency vs Nationwide - [Marsh McLennan Agency vs Nationwide](https://spot.insure/compare/marsh-mclennan-agency-vs-nationwide): all coverage lines, business roles, service and claims. - [What Is Professional Errors and Omissions (E&O) Insurance?](https://spot.insure/coverage/professional-errors-omissions): Professional liability can help pay covered defense costs and losses when a client says your advice or service caused financial harm; check services and reporting terms. - [Marsh McLennan Agency vs Nationwide Builders Risk Insurance](https://spot.insure/compare/marsh-mclennan-agency-vs-nationwide/builders-risk) - [Marsh McLennan Agency vs Nationwide Cargo and Transit Insurance](https://spot.insure/compare/marsh-mclennan-agency-vs-nationwide/cargo-transit) - [Marsh McLennan Agency vs Nationwide Commercial Auto Insurance](https://spot.insure/compare/marsh-mclennan-agency-vs-nationwide/commercial-auto) - [Marsh McLennan Agency vs Nationwide Commercial Property Insurance](https://spot.insure/compare/marsh-mclennan-agency-vs-nationwide/commercial-property) - [Marsh McLennan Agency vs Nationwide Crime Insurance](https://spot.insure/compare/marsh-mclennan-agency-vs-nationwide/crime) - [Marsh McLennan Agency vs Nationwide Cyber Insurance](https://spot.insure/compare/marsh-mclennan-agency-vs-nationwide/cyber) - [Marsh McLennan Agency vs Nationwide D&O Insurance](https://spot.insure/compare/marsh-mclennan-agency-vs-nationwide/directors-officers) - [Marsh McLennan Agency vs Nationwide Employment Practices Liability Insurance](https://spot.insure/compare/marsh-mclennan-agency-vs-nationwide/employment-practices) - [Marsh McLennan Agency vs Nationwide Fiduciary Liability Insurance](https://spot.insure/compare/marsh-mclennan-agency-vs-nationwide/fiduciary) - [Marsh McLennan Agency vs Nationwide General Liability Insurance](https://spot.insure/compare/marsh-mclennan-agency-vs-nationwide/general-liability) - [Marsh McLennan Agency vs Nationwide Surety Bonds](https://spot.insure/compare/marsh-mclennan-agency-vs-nationwide/surety-bonds) - [Marsh McLennan Agency vs Nationwide Workers’ Compensation Insurance](https://spot.insure/compare/marsh-mclennan-agency-vs-nationwide/workers-compensation) - [AIG vs Marsh McLennan Agency Professional Liability (E&O) Insurance](https://spot.insure/compare/aig-vs-marsh-mclennan-agency/professional-errors-omissions) - [AIG vs Nationwide Professional Liability (E&O) Insurance](https://spot.insure/compare/aig-vs-nationwide/professional-errors-omissions) - [Alliance Risk vs Marsh McLennan Agency Professional Liability (E&O) Insurance](https://spot.insure/compare/alliance-risk-vs-marsh-mclennan-agency/professional-errors-omissions) - [Alliance Risk vs Nationwide Professional Liability (E&O) Insurance](https://spot.insure/compare/alliance-risk-vs-nationwide/professional-errors-omissions) - [Aon vs Marsh McLennan Agency Professional Liability (E&O) Insurance](https://spot.insure/compare/aon-vs-marsh-mclennan-agency/professional-errors-omissions) - [Aon vs Nationwide Professional Liability (E&O) Insurance](https://spot.insure/compare/aon-vs-nationwide/professional-errors-omissions) ## Sources for Marsh McLennan Agency vs Nationwide ### Sources About Marsh McLennan Agency 1. [Who We Are](https://www.marshmma.com/us/mma/about-us.html). 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. 2. [Small Business Insurance Solutions](https://www.marshmma.com/us/solutions/small-business.html). 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. 3. [Executive and Professional Liability | MMA](https://www.marshmma.com/us/solutions/executive-and-professional-liability.html). Marsh McLennan Agency; E&O, architects and engineers, and lawyers professional lines are named in the policy suite.. Accessed 2026-09-30. ### Sources About Nationwide 4. [Small Business Insurance](https://www.nationwide.com/business/insurance/small-commercial/). 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. 5. [Small Business Insurance Solutions for Agents](https://www.nationwide.com/agents/business/). 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. 6. [Terms and Conditions for Nationwide.com](https://www.nationwide.com/personal/about-us/terms-conditions). 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. 7. [Errors and Omissions Insurance](https://www.nationwide.com/business/insurance/errors-and-omissions/). Nationwide; E&O page; professional-services liability and coverage overview.. Accessed 2026-09-30. ### Sources for the Professional Liability (E&O) Insurance Guide 8. [FAQ: Professional liability insurance](https://www.tdi.texas.gov/commercial/pl-faq.html). 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. 9. [Professional liability insurance](https://www.iii.org/article/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. 10. [Get business insurance](https://www.sba.gov/counseling/launch-your-business/#business-insurance). U.S. Small Business Administration; Six common types of business insurance table. Accessed 2026-09-16. 11. [Professional Liability – US Direct Errors and Omissions Insurance](https://www.hiscox.com/documents/pl-sample-policy-wording.pdf). 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. Updated 2026-10-01. Spot, a product of Tools for Enlightenment, publishes this research and works in the commercial insurance market. The comparison applies the same criteria to both providers. [Editorial policy](https://spot.insure/editorial-policy). To suggest a correction, [contact Spot](https://spot.insure/contact) with the page URL and supporting source. ## Marsh McLennan Agency Review Scores for 2026 Review Score: 8.2 / 10 from 2 rated sources, equally weighted. 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. - Trustpilot: TrustScore 3.2 (out of 5); 1 reviews. Trustpilot profile for marshmma.com, MMA's own domain. Unclaimed; MMA has not invited reviews. Period: checked 2026-09-29. Checked 2026-09-29. [marshmma.com Trustpilot profile](https://www.trustpilot.com/review/marshmma.com) - Trustpilot: TrustScore (Marsh brand) 1.3 (out of 5); 115 reviews. Trustpilot page for marsh.com, the global Marsh brand (mostly individual and non-US customers). This is a different entity from MMA. Period: checked 2026-09-29. Checked 2026-09-29. [Marsh Reviews](https://www.trustpilot.com/review/www.marsh.com) - BBB: BBB business grade A. BBB San Diego-area profile for Marsh & McLennan Agency LLC (accredited). MMA has separate BBB profiles per office; Dayton and Schaumburg both show A+. Checked 2026-09-29. [Marsh & McLennan Agency LLC (San Diego) BBB](https://www.bbb.org/us/ca/san-diego/profile/insurance-services-office/marsh-mclennan-agency-llc-1126-3000103) - BBB: Complaints 4. Same San Diego-area profile; zero customer reviews. No client-count denominator. Period: closed in the last three years (checked 2026-09-29). Checked 2026-09-29. [Marsh & McLennan Agency LLC — BBB Complaints](https://www.bbb.org/us/ca/san-diego/profile/insurance-services-office/marsh-mclennan-agency-llc-1126-3000103/complaints); [Marsh & McLennan Agency LLC — BBB Reviews](https://www.bbb.org/us/ca/san-diego/profile/insurance-services-office/marsh-mclennan-agency-llc-1126-3000103/customer-reviews) Reviewed 2026-09-29. [Read the sourced review](https://spot.insure/insurance-providers/marsh-mclennan-agency/reviews). ## Nationwide Review Scores for 2026 Review Score: 7.8 / 10 from 4 rated sources, equally weighted. 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. - NerdWallet: NerdWallet rating 4.5 (out of 5). NerdWallet's editorial small-business review of Nationwide, updated 2026-06-03. It is an expert score, not a customer average. The page header shows 4.5 and a partner card on the same page shows 4.0; the 4.5 is the review's own headline rating. Period: review updated 2026-06-03. Checked 2026-09-29. [Nationwide Business Insurance Review 2026](https://www.nerdwallet.com/business/insurance/learn/nationwide-business-insurance) - J.D. Power: 2025 Small Commercial satisfaction index 707 (out of 1,000); 2848 reviews. 2025 U.S. Small Commercial Insurance Study: 2,848 U.S. businesses with 50 or fewer employees, fielded Mar-May 2025. Nationwide scored 707 against a study average of 698. A 2026 study was published 2026-08-20 (average 713); Nationwide's 2026 score was not found. Period: 2025 study. Checked 2026-09-29. [2025 U.S. Small Commercial Insurance Study](https://www.jdpower.com/sites/default/files/file/2025-08/2025092%20U.S.%20Small%20Commercial%20Insurance%20Study.pdf); [U.S. Small Commercial Insurance Study](https://www.jdpower.com/business/u-s-small-commercial-insurance-study/); [Rates, Digital Support Boost Small Business Insurance Customer Satisfaction: JD Power](https://www.carriermanagement.com/news/2026/08/20/291242.htm) - Trustpilot: TrustScore 1.3 (out of 5); 261 reviews. Nationwide's main Trustpilot page. It mixes personal and commercial customers; it cannot be separated. The page text says 1.3 out of 5 while an embedded badge image text said 1.5; we use the visible text score. Period: 69 reviews in the prior 12 months (checked 2026-09-29). Checked 2026-09-29. [Nationwide Reviews](https://www.trustpilot.com/review/nationwide.com) - ConsumerAffairs: ConsumerAffairs auto average 1.5 (out of 5); 1091 reviews. ConsumerAffairs Nationwide personal auto page (1,091 reviews displayed). Personal auto, not commercial. Period: checked 2026-09-29. Checked 2026-09-29. [Nationwide Auto Insurance Reviews](https://www.consumeraffairs.com/insurance/nationwide_auto.html) - ConsumerAffairs: ConsumerAffairs rating 2.5 (out of 5); 19 reviews. ConsumerAffairs Nationwide Small Business Insurance page; unclaimed profile; small-business customers. Screenshot captured 2026-09-29. Period: page updated Aug. 14, 2026; captured 2026-09-29. Checked 2026-09-29. [Nationwide Small Business Insurance Reviews](https://www.consumeraffairs.com/insurance/nationwide-small-business-insurance.html) - BBB: BBB business grade A+. BBB Nationwide profile at the Columbus, Ohio headquarters (BBB Accredited). Covers all Nationwide products, not just commercial. Checked 2026-09-29. [Nationwide BBB Complaints Profile](https://www.bbb.org/us/oh/columbus/profile/insurance-companies/nationwide-0302-2388/complaints) - BBB: Complaints 111. Same BBB headquarters profile; all Nationwide products, no premium denominator. BBB warns complaint details may be incomplete. The page also shows 269 customer reviews but no star average. Period: closed in the last three years (checked 2026-09-29). Checked 2026-09-29. [Nationwide BBB customer reviews](https://www.bbb.org/us/oh/columbus/profile/insurance-companies/nationwide-0302-2388/customer-reviews) Reviewed 2026-09-29. [Read the sourced review](https://spot.insure/insurance-providers/nationwide/reviews). ## Agent and Developer Resources - [Markdown page](https://spot.insure/compare/marsh-mclennan-agency-vs-nationwide/professional-errors-omissions.md) - [Developer resources](https://spot.insure/developers) - [Public MCP server](https://spot.insure/mcp) - [MCP server manifest](https://spot.insure/server.json) - [OpenAPI description](https://spot.insure/openapi.json) - [Public page index](https://spot.insure/llms.txt)