---
title: "Marsh McLennan Agency vs Vouch: Professional Liability (E&O) Insurance"
description: "Vouch partner information distinguishes the Corix product from other Vouch placements."
canonical: "https://spot.insure/compare/marsh-mclennan-agency-vs-vouch/professional-errors-omissions"
page-type: "line-comparison"
updated-at: "2026-09-30"
comparison-pair: "marsh-mclennan-agency-vs-vouch"
provider-a: "marsh-mclennan-agency"
provider-b: "vouch"
coverage-line: "professional-errors-omissions"
---

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[Human-readable page](https://spot.insure/compare/marsh-mclennan-agency-vs-vouch/professional-errors-omissions)

## Agent Guide

**What this page is:** Focused comparison of Marsh McLennan Agency and Vouch 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 Vouch. 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 Vouch for Professional Liability (E&O) Insurance: how do they differ?
- Which is better for Professional Liability (E&O) Insurance, Marsh McLennan Agency or Vouch?
- What does Marsh McLennan Agency or Vouch 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 Vouch?

**Key facts:**
- Line: Professional Liability (E&O) Insurance. Providers: Marsh McLennan Agency and Vouch.
- 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:**
- [Marsh McLennan Agency vs Vouch](https://spot.insure/compare/marsh-mclennan-agency-vs-vouch) — 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)
- [Vouch profile](https://spot.insure/insurance-providers/vouch) — provider profile (evidence)
- [Marsh McLennan Agency vs Vouch Commercial Property Insurance](https://spot.insure/compare/marsh-mclennan-agency-vs-vouch/commercial-property) — 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 Vouch Professional Liability (E&O) Insurance](https://spot.insure/compare/aig-vs-vouch/professional-errors-omissions) — sibling comparison (other line, or other pair for this line)
- [Alliance Risk vs Vouch Professional Liability (E&O) Insurance](https://spot.insure/compare/alliance-risk-vs-vouch/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 Vouch Professional Liability (E&O) Insurance](https://spot.insure/compare/at-bay-vs-vouch/professional-errors-omissions) — sibling comparison (other line, or other pair for this line)
- [The Baldwin Group vs Vouch Professional Liability (E&O) Insurance](https://spot.insure/compare/baldwin-vs-vouch/professional-errors-omissions) — sibling comparison (other line, or other pair for this line)

# Marsh McLennan Agency vs Vouch: How Do They Compare for Professional Liability (E&O) Insurance?

Vouch partner information distinguishes the Corix product from other Vouch placements.

## Research Scope and Use

Use this comparison to evaluate Marsh McLennan Agency and Vouch 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

MMA names E&O, architects-and-engineers, and lawyers professional liability as professional lines. Vouch places E&O for professional-services clients and identifies Corix as one partner with a dedicated E&O product covering negligence, mistakes, or inadequate work that causes client financial loss. [3](https://www.marshmma.com/us/solutions/executive-and-professional-liability.html "Executive and Professional Liability | MMA") [9](https://www.corixinsurance.com/products/cyber-and-errors-omissions "Cyber and Errors & Omissions")

## 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 Vouch Insurance?

Vouch suits startups and growing companies that want an online application, advisor-led carrier comparisons and contract-requirement reviews; buyers seeking direct insurer purchase or instant quotes should compare digital carriers. [4](https://www.vouch.us/ "Vouch Homepage") [5](https://apply.vouch.us/ "Start a Vouch Application") [6](https://www.vouch.us/blog/how-having-carrier-options-in-one-place-helps-businesses-choose-smarter-coverage "Carrier Options in One Place") [7](https://www.vouch.us/services/contract-requirement-review "Contract Requirement Review")

[Vouch profile](https://spot.insure/insurance-providers/vouch)

## 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](https://www.tdi.texas.gov/commercial/pl-faq.html "FAQ: Professional liability insurance") [12](https://www.iii.org/article/professional-liability-insurance "Professional liability insurance") [13](https://www.sba.gov/counseling/launch-your-business/#business-insurance "Get business insurance") [14](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

### Which Professional Work Is Named

Vouch markets professional E&O to accounting and finance, architecture and engineering, IT and management consulting, and marketing agencies. MMA names architects-and-engineers and lawyers lines but does not detail the same sector list in its overview, so businesses in consulting or creative services should ask which specific placement fits. [3](https://www.marshmma.com/us/solutions/executive-and-professional-liability.html "Executive and Professional Liability | MMA") [8](https://www.vouch.us/professional-services "Insurance for Professional Services Firms")

### Placement Scope and Buying Route

Vouch’s own site routes prospects through an online Get Started flow, while Corix provides a downloadable application for brokers. MMA directs organizations to an adviser or specialist; ask each contact what information is needed before a quote. [3](https://www.marshmma.com/us/solutions/executive-and-professional-liability.html "Executive and Professional Liability | MMA") [8](https://www.vouch.us/professional-services "Insurance for Professional Services Firms")

## What to Confirm in Professional Liability (E&O) Insurance Quotes

- Would your Vouch quote use Corix’s E&O product, and which insurer and form would issue it? [8](https://www.vouch.us/professional-services "Insurance for Professional Services Firms")
- Which MMA professional line and application materials apply to your service and client contracts? [3](https://www.marshmma.com/us/solutions/executive-and-professional-liability.html "Executive and Professional Liability | MMA")

## Offering Details

| Criteria | Marsh McLennan Agency professional errors omissions (official overview) | Vouch Errors & Omissions Insurance |
| --- | --- | --- |
| 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..) | Vouch is a broker, not an insurer, for professional errors & omissions coverage. It lists Errors & Omissions among the core coverages it places for professional-services clients, and one of its named program partners, Corix, has a dedicated E&O product. [8](https://www.vouch.us/professional-services "Insurance for Professional Services Firms") [9](https://www.corixinsurance.com/products/cyber-and-errors-omissions "Cyber and Errors & Omissions") (Evidence: Company-reported; scope: Vouch's Professional Services page and Corix's cyber/E&O product page..) |
| Issuing Insurer | Confirm in your quote. | Corix's disclosures say its proprietary products, including its E&O line, are issued by State National Insurance Company or United Specialty Insurance Company. That names an insurer for Corix-branded E&O products specifically, not for every Vouch professional-liability placement. [10](https://www.corixinsurance.com/legal/disclosures "Legal Disclosures") (Evidence: Company-reported; scope: Corix disclosures page..) |
| 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..) | Vouch markets professional E&O to accounting and finance, architecture/engineering/construction, IT consulting, management consulting, and marketing and creative agency firms. [8](https://www.vouch.us/professional-services "Insurance for Professional Services Firms") (Evidence: Company-reported; scope: Vouch's Professional Services page; not an underwriting appetite guarantee for any specific applicant..) |
| 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..) | Corix describes E&O as protecting a business against claims of negligence, mistakes or inadequate work that cause a client financial loss in the provision of professional services, including legal defense costs and any damages awarded, even when the claim is ultimately groundless. [9](https://www.corixinsurance.com/products/cyber-and-errors-omissions "Cyber and Errors & Omissions") (Evidence: Company-reported; scope: Corix's cyber and E&O product page; actual insuring agreements and exclusions are set by the issued policy..) |
| 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..) | Neither the Vouch nor Corix pages publish E&O policy limits or retentions. [8](https://www.vouch.us/professional-services "Insurance for Professional Services Firms") [9](https://www.corixinsurance.com/products/cyber-and-errors-omissions "Cyber and Errors & Omissions") (Evidence: Not publicly disclosed; scope: Pages checked on 2026-09-23..) |
| 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..) | Corix's E&O product page offers a downloadable application and directs brokers to start an appointment process; Vouch's own site routes prospective buyers to its online "Get Started" application flow. [9](https://www.corixinsurance.com/products/cyber-and-errors-omissions "Cyber and Errors & Omissions") [8](https://www.vouch.us/professional-services "Insurance for Professional Services Firms") (Evidence: Company-reported; scope: Corix product page and Vouch site navigation..) |

## Full Comparison

- [Marsh McLennan Agency vs Vouch](https://spot.insure/compare/marsh-mclennan-agency-vs-vouch): 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 Vouch Commercial Property Insurance](https://spot.insure/compare/marsh-mclennan-agency-vs-vouch/commercial-property)
- [AIG vs Marsh McLennan Agency Professional Liability (E&O) Insurance](https://spot.insure/compare/aig-vs-marsh-mclennan-agency/professional-errors-omissions)
- [AIG vs Vouch Professional Liability (E&O) Insurance](https://spot.insure/compare/aig-vs-vouch/professional-errors-omissions)
- [Alliance Risk vs Vouch Professional Liability (E&O) Insurance](https://spot.insure/compare/alliance-risk-vs-vouch/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 Vouch Professional Liability (E&O) Insurance](https://spot.insure/compare/at-bay-vs-vouch/professional-errors-omissions)
- [The Baldwin Group vs Vouch Professional Liability (E&O) Insurance](https://spot.insure/compare/baldwin-vs-vouch/professional-errors-omissions)

## Sources

### 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.

### Vouch

4. [Vouch Homepage](https://www.vouch.us/). Vouch; Hero identifying Vouch as an insurance broker; Industries; Services; footer identifying Vouch Specialty and qualifying product availability. Accessed 2026-09-15.
5. [Start a Vouch Application](https://apply.vouch.us/). Vouch; Public first screen: legal business name, website/no-website option, address and location type, applicant role and contact fields, consent, and existing-customer sign-in. Accessed 2026-09-15.
6. [Carrier Options in One Place](https://www.vouch.us/blog/how-having-carrier-options-in-one-place-helps-businesses-choose-smarter-coverage). Vouch; 26 November 2025: Choice Without the Chaos; Clarity That Builds Confidence; One Relationship, Many Solutions; final producer/underwriting disclosure. Accessed 2026-09-15.
7. [Contract Requirement Review](https://www.vouch.us/services/contract-requirement-review). Vouch; Coverage that keeps your deals moving; Tailored to your contract; Effortless Experience (reviews and COIs). Accessed 2026-09-15.
8. [Insurance for Professional Services Firms](https://www.vouch.us/professional-services). Vouch; Expertise across professional services: Accounting & Finance, Architecture/Engineering/Construction, IT Consulting, Management Consulting, Marketing & Creative Agencies; Core coverages for Professional Services: Errors & Omissions, General Liability, Cyber Liability, Employment Practices Liability, Workers' Compensation. Accessed 2026-09-23.
9. [Cyber and Errors & Omissions](https://www.corixinsurance.com/products/cyber-and-errors-omissions). Corix Insurance; Errors & Omissions insurance provided by Corix helps protect businesses for claims of negligence, mistakes, or inadequate work that causes a financial loss to clients, in the provision of professional services. It includes legal defense costs and damages awarded, even when the claim is groundless.. Accessed 2026-09-23.
10. [Legal Disclosures](https://www.corixinsurance.com/legal/disclosures). Corix Insurance; Policies are issued by State National Insurance Company (NAIC# 12831) or United Specialty Insurance Company (NAIC#12537).. Accessed 2026-09-23.

### Professional Liability (E&O) Insurance Guide

11. [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.
12. [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.
13. [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.
14. [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.

## 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).

## Vouch Reviews

Review Score: 6.6 / 10 from 1 rated source, equally weighted.

Vouch’s four Trustpilot reviews are too few to establish consistent service quality. Ask for references and clarify support after placement.

- Trustpilot: Trustpilot TrustScore 3.3 (5 stars); 4 reviews. Self-selected consumer aggregate; product and business/personal scope may be mixed. Period: accessed 2026-09-25. Checked 2026-09-25. [Trustpilot result for Vouch](https://www.trustpilot.com/review/vouch.us)

Reviewed 2026-09-25. [Read the sourced review](https://spot.insure/insurance-providers/vouch/reviews).

## Agent and Developer Resources

- [Markdown page](https://spot.insure/compare/marsh-mclennan-agency-vs-vouch/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)