--- title: "Markel Insurance vs Marsh McLennan Agency: Professional Liability (E&O) Insurance" description: "Compare Markel's miscellaneous E&O and $2 million stated maximum with Marsh McLennan Agency's adviser-led specialist placements." canonical: "https://spot.insure/compare/markel-vs-marsh-mclennan-agency/professional-errors-omissions" page-type: "line-comparison" updated-at: "2026-09-30" comparison-pair: "markel-vs-marsh-mclennan-agency" provider-a: "markel" provider-b: "marsh-mclennan-agency" 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/markel-vs-marsh-mclennan-agency/professional-errors-omissions) ## Agent Guide **What this page is:** Focused comparison of Markel Insurance and Marsh McLennan Agency 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 Markel Insurance versus Marsh McLennan Agency. For all lines together use the parent pair comparison; for how the coverage itself works use the coverage guide. **Questions this page answers:** - Markel Insurance vs Marsh McLennan Agency for Professional Liability (E&O) Insurance: how do they differ? - Which is better for Professional Liability (E&O) Insurance, Markel Insurance or Marsh McLennan Agency? - What does Markel Insurance or Marsh McLennan Agency 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 Markel Insurance or Marsh McLennan Agency? **Key facts:** - Line: Professional Liability (E&O) Insurance. Providers: Markel Insurance and Marsh McLennan Agency. - 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 2026-09-30. Editorial policy: /editorial-policy. **Related pages:** - [Markel Insurance vs Marsh McLennan Agency](https://spot.insure/compare/markel-vs-marsh-mclennan-agency) — 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 - [Markel Insurance profile](https://spot.insure/insurance-providers/markel) — provider profile (evidence) - [Marsh McLennan Agency profile](https://spot.insure/insurance-providers/marsh-mclennan-agency) — provider profile (evidence) - [Markel Insurance vs Marsh McLennan Agency Builders Risk Insurance](https://spot.insure/compare/markel-vs-marsh-mclennan-agency/builders-risk) — sibling comparison (other line, or other pair for this line) - [Markel Insurance vs Marsh McLennan Agency Cargo and Transit Insurance](https://spot.insure/compare/markel-vs-marsh-mclennan-agency/cargo-transit) — sibling comparison (other line, or other pair for this line) - [Markel Insurance vs Marsh McLennan Agency Commercial Property Insurance](https://spot.insure/compare/markel-vs-marsh-mclennan-agency/commercial-property) — sibling comparison (other line, or other pair for this line) - [Markel Insurance vs Marsh McLennan Agency Crime Insurance](https://spot.insure/compare/markel-vs-marsh-mclennan-agency/crime) — sibling comparison (other line, or other pair for this line) - [Markel Insurance vs Marsh McLennan Agency Cyber Insurance](https://spot.insure/compare/markel-vs-marsh-mclennan-agency/cyber) — sibling comparison (other line, or other pair for this line) - [Markel Insurance vs Marsh McLennan Agency D&O Insurance](https://spot.insure/compare/markel-vs-marsh-mclennan-agency/directors-officers) — sibling comparison (other line, or other pair for this line) - [Markel Insurance vs Marsh McLennan Agency Employment Practices Liability Insurance](https://spot.insure/compare/markel-vs-marsh-mclennan-agency/employment-practices) — sibling comparison (other line, or other pair for this line) - [Markel Insurance vs Marsh McLennan Agency Fiduciary Liability Insurance](https://spot.insure/compare/markel-vs-marsh-mclennan-agency/fiduciary) — sibling comparison (other line, or other pair for this line) - [Markel Insurance vs Marsh McLennan Agency Media Liability Insurance](https://spot.insure/compare/markel-vs-marsh-mclennan-agency/media) — sibling comparison (other line, or other pair for this line) - [Markel Insurance vs Marsh McLennan Agency Workers’ Compensation Insurance](https://spot.insure/compare/markel-vs-marsh-mclennan-agency/workers-compensation) — sibling comparison (other line, or other pair for this line) - [AIG vs Markel Insurance Professional Liability (E&O) Insurance](https://spot.insure/compare/aig-vs-markel/professional-errors-omissions) — 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) - [Alliance Risk vs Markel Insurance Professional Liability (E&O) Insurance](https://spot.insure/compare/alliance-risk-vs-markel/professional-errors-omissions) — sibling comparison (other line, or other pair for this line) - [Aon vs Markel Insurance Professional Liability (E&O) Insurance](https://spot.insure/compare/aon-vs-markel/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) - [At-Bay vs Markel Insurance Professional Liability (E&O) Insurance](https://spot.insure/compare/at-bay-vs-markel/professional-errors-omissions) — sibling comparison (other line, or other pair for this line) # Markel Insurance vs Marsh McLennan Agency: How Do They Compare for Professional Liability (E&O) Insurance? Compare Markel's miscellaneous E&O and $2 million stated maximum with Marsh McLennan Agency's adviser-led specialist placements. ## Research Scope and Use Use this comparison to evaluate Markel Insurance and Marsh McLennan Agency 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. ## Summary Markel targets small-business miscellaneous E&O with a $2 million stated maximum; Marsh McLennan Agency lists E&O alongside specialist lines such as architects and engineers and lawyers liability. [3](https://www.markel.com/us/commercial/professional-and-management-liability/probiz "ProBiz | Professional Liability Coverage") [6](https://www.marshmma.com/us/solutions/executive-and-professional-liability.html "Executive and Professional Liability | MMA") ## Markel Insurance: Specialty Business and Products Markel Insurance is Markel Group's specialty and small-business insurance business, with offerings across packages, workers' compensation, cyber, professional and management liability, property, marine, and surety. Products use different insurers and distribution routes, so compare the issuer and terms shown on the specific quote. [1](https://www.markel.com/about-us "About us") [2](https://www.sec.gov/Archives/edgar/data/1096343/000109634326000020/mkl-20251231.htm "Markel Group Inc. 2025 Form 10-K") [Markel Insurance profile](https://spot.insure/insurance-providers/markel) ## 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](https://www.marshmma.com/us/mma/about-us.html "Who We Are") [5](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 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](https://www.tdi.texas.gov/commercial/pl-faq.html "FAQ: Professional liability insurance") [8](https://www.iii.org/article/professional-liability-insurance "Professional liability insurance") [9](https://www.sba.gov/counseling/launch-your-business/#business-insurance "Get business insurance") [10](https://www.hiscox.com/documents/pl-sample-policy-wording.pdf "Professional Liability – US Direct Errors and Omissions Insurance") ## Key Differences in Professional Liability (E&O) Insurance ### General E&O and specialist lines Markel describes miscellaneous E&O for small businesses in selected industries, with revenue scope up to $5 million and a $2 million product-page maximum. Marsh McLennan Agency names E&O and specialist professional-liability lines, including architects and engineers and lawyers liability, while noting these are not one shared policy. Licensed firms should check whether they need a specialty form rather than miscellaneous E&O, then compare actual limits. [3](https://www.markel.com/us/commercial/professional-and-management-liability/probiz "ProBiz | Professional Liability Coverage") [6](https://www.marshmma.com/us/solutions/executive-and-professional-liability.html "Executive and Professional Liability | MMA") ### How a placement begins Markel invites prospective customers or brokers to contact its team. MMA directs organizations to an adviser or specialist to discuss placement; its overview does not itemize covered E&O claims or establish quote and bind timing. The consultation can identify which specialist product fits, but the quote and issued wording determine coverage. [3](https://www.markel.com/us/commercial/professional-and-management-liability/probiz "ProBiz | Professional Liability Coverage") [6](https://www.marshmma.com/us/solutions/executive-and-professional-liability.html "Executive and Professional Liability | MMA") ## What to Confirm in Professional Liability (E&O) Insurance Quotes - Ask Markel which services and revenue bands qualify and request its policy limit and exclusions. - Ask MMA whether your profession needs a specialist form, who will issue the policy and how its terms differ from miscellaneous E&O. ## Offering Details | Criteria | Markel professional errors omissions (official overview) | Marsh McLennan Agency professional errors omissions (official overview) | | --- | --- | --- | | Role in This Line | Markel describes offering professional errors omissions for the audience stated on the cited product page. [3](https://www.markel.com/us/commercial/professional-and-management-liability/probiz "ProBiz | Professional Liability Coverage") (Evidence: Company-reported; scope: professional errors omissions marketed by markel; scope is limited to the cited official product overview and described audience. This is not a policy form or a universal eligibility statement..) | Marsh McLennan Agency describes arranging professional errors omissions for the audience stated on the cited product page. [6](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..) | | Who It’s For | Small businesses in ProBiz's targeted industries; source describes businesses up to $5 million revenue for the miscellaneous E&O product. [3](https://www.markel.com/us/commercial/professional-and-management-liability/probiz "ProBiz | Professional Liability Coverage") (Evidence: Company-reported; scope: professional errors omissions marketed by markel; scope is limited to the cited official product overview and described audience. This is not a policy form or a universal eligibility statement..) | Organizations seeking professional liability placement; source does not imply all professions share one policy. [6](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..) | | Coverage Features | The cited product page describes miscellaneous E&O for covered claims arising from professional services, with the page describing separate E&O and management-liability products. Marketing description only; actual coverage, exclusions, conditions, limits, and availability depend on the issued policy and jurisdiction. [3](https://www.markel.com/us/commercial/professional-and-management-liability/probiz "ProBiz | Professional Liability Coverage") (Evidence: Company-reported; scope: professional errors omissions marketed by markel; 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 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. [6](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..) | | Limits and Retentions | For its miscellaneous E&O product, Markel states coverage up to $2 million; this is a product-page maximum, not a promise that every applicant or quote receives that amount. [3](https://www.markel.com/us/commercial/professional-and-management-liability/probiz "ProBiz | Professional Liability Coverage") (Evidence: Company-reported; scope: Markel ProBiz miscellaneous E&O marketing page; class, underwriting, policy terms, and actual quoted limit control..) | 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. [6](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..) | | How to Apply | The page invites prospective customers or brokers to contact Markel or the named underwriting team. The page does not establish a quote, bind, or coverage-effective timeline. [3](https://www.markel.com/us/commercial/professional-and-management-liability/probiz "ProBiz | Professional Liability Coverage") (Evidence: Company-reported; scope: professional errors omissions marketed by markel; 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 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. [6](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..) | ## Full Comparison - [Markel Insurance vs Marsh McLennan Agency](https://spot.insure/compare/markel-vs-marsh-mclennan-agency): 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. - [Markel Insurance vs Marsh McLennan Agency Builders Risk Insurance](https://spot.insure/compare/markel-vs-marsh-mclennan-agency/builders-risk) - [Markel Insurance vs Marsh McLennan Agency Cargo and Transit Insurance](https://spot.insure/compare/markel-vs-marsh-mclennan-agency/cargo-transit) - [Markel Insurance vs Marsh McLennan Agency Commercial Property Insurance](https://spot.insure/compare/markel-vs-marsh-mclennan-agency/commercial-property) - [Markel Insurance vs Marsh McLennan Agency Crime Insurance](https://spot.insure/compare/markel-vs-marsh-mclennan-agency/crime) - [Markel Insurance vs Marsh McLennan Agency Cyber Insurance](https://spot.insure/compare/markel-vs-marsh-mclennan-agency/cyber) - [Markel Insurance vs Marsh McLennan Agency D&O Insurance](https://spot.insure/compare/markel-vs-marsh-mclennan-agency/directors-officers) - [Markel Insurance vs Marsh McLennan Agency Employment Practices Liability Insurance](https://spot.insure/compare/markel-vs-marsh-mclennan-agency/employment-practices) - [Markel Insurance vs Marsh McLennan Agency Fiduciary Liability Insurance](https://spot.insure/compare/markel-vs-marsh-mclennan-agency/fiduciary) - [Markel Insurance vs Marsh McLennan Agency Media Liability Insurance](https://spot.insure/compare/markel-vs-marsh-mclennan-agency/media) - [Markel Insurance vs Marsh McLennan Agency Workers’ Compensation Insurance](https://spot.insure/compare/markel-vs-marsh-mclennan-agency/workers-compensation) - [AIG vs Markel Insurance Professional Liability (E&O) Insurance](https://spot.insure/compare/aig-vs-markel/professional-errors-omissions) - [AIG vs Marsh McLennan Agency Professional Liability (E&O) Insurance](https://spot.insure/compare/aig-vs-marsh-mclennan-agency/professional-errors-omissions) - [Alliance Risk vs Markel Insurance Professional Liability (E&O) Insurance](https://spot.insure/compare/alliance-risk-vs-markel/professional-errors-omissions) - [Aon vs Markel Insurance Professional Liability (E&O) Insurance](https://spot.insure/compare/aon-vs-markel/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) - [At-Bay vs Markel Insurance Professional Liability (E&O) Insurance](https://spot.insure/compare/at-bay-vs-markel/professional-errors-omissions) ## Sources ### Markel Insurance 1. [About us](https://www.markel.com/about-us). Markel; Markel at a glance; description of Markel Insurance within Markel Group Inc.. Accessed 2026-09-28. 2. [Markel Group Inc. 2025 Form 10-K](https://www.sec.gov/Archives/edgar/data/1096343/000109634326000020/mkl-20251231.htm). U.S. Securities and Exchange Commission; filed by Markel Group Inc.; Cover page; Part I, Item 1 Business—Markel Insurance, U.S. Wholesale and Specialty, Programs and Solutions; Part II, Item 7/8 for group and segment risks. Accessed 2026-09-28. 3. [ProBiz | Professional Liability Coverage](https://www.markel.com/us/commercial/professional-and-management-liability/probiz). Markel; Miscellaneous E&O; types of covered professional-service errors; ProBiz target classes and process.. Accessed 2026-09-30. ### Marsh McLennan Agency 4. [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. 5. [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. 6. [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. ### Professional Liability (E&O) Insurance Guide 7. [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. 8. [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. 9. [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. 10. [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 2026-09-30. 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. ## Markel Insurance Reviews Review Score: 7.5 / 10 from 2 rated sources, equally weighted. There is little public customer feedback on Markel. Trustpilot shows 2.5 out of 5 from just 5 reviews, and BBB lists 12 complaints closed in the last three years. - J.D. Power: Commercial Lines Insurers agent satisfaction score 726 (out of 1,000). 2022 commercial-lines independent-agent satisfaction study and 2025 small-commercial customer study; these use different populations and measures Period: 2022. Checked 2026-09-29. [2025 U.S. Small Commercial Insurance Study](https://www.jdpower.com/business/press-releases/2025-us-small-commercial-insurance-study); [2022 U.S. Independent Agent Satisfaction Study](https://www.jdpower.com/sites/default/files/file/2022-10/2022134%20U.S.%20Independent%20Agent.pdf) - Trustpilot: TrustScore 2.5 (out of 5); 5 reviews. Trustpilot brand-level page for markel.com. It mixes products and is not mapped to one legal insurer. Checked 2026-09-29. [Markel Reviews](https://www.trustpilot.com/review/markel.com) - BBB: BBB business grade A+. BBB business profile for Markel Insurance Company headquarters/corporate-owned locations; review and complaint submissions may include other products and affiliates Checked 2026-09-29. [Markel Insurance Company Business Profile](https://www.bbb.org/us/va/glen-allen/profile/insurance-companies/markel-insurance-company-0603-4017547); [Markel Insurance Company Complaints](https://www.bbb.org/us/va/glen-allen/profile/insurance-companies/markel-insurance-company-0603-4017547/complaints) - BBB: Complaints 12; 12 reviews. BBB profile for Markel Insurance Company; complaints may include other Markel products and affiliates and BBB says not all submissions are displayed. Period: last 3 years, as displayed 2026-09-29. Checked 2026-09-29. [Markel Insurance Company Complaints](https://www.bbb.org/us/va/glen-allen/profile/insurance-companies/markel-insurance-company-0603-4017547/complaints) Reviewed 2026-09-29. [Read the sourced review](https://spot.insure/insurance-providers/markel/reviews). ## Marsh McLennan Agency Reviews 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). ## Agent and Developer Resources - [Markdown page](https://spot.insure/compare/markel-vs-marsh-mclennan-agency/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)