---
title: "Marsh McLennan Agency vs Simply Business: Professional Liability (E&O) Insurance"
description: "Simply Business listing gives example professions and quote route; MMA overview names professional lines."
canonical: "https://spot.insure/compare/marsh-mclennan-agency-vs-simply-business/professional-errors-omissions"
page-type: "line-comparison"
updated-at: "2026-09-30"
comparison-pair: "marsh-mclennan-agency-vs-simply-business"
provider-a: "marsh-mclennan-agency"
provider-b: "simply-business"
coverage-line: "professional-errors-omissions"
---

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

## Agent Guide

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

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

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

Simply Business listing gives example professions and quote route; MMA overview names professional lines.

## Research Scope and Use

Use this comparison to evaluate Marsh McLennan Agency and Simply Business 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

Marsh McLennan Agency identifies E&O and distinct architects-and-engineers and lawyers professional lines. Simply Business describes claims tied to professional work and lists attorney fees, court costs, settlements, and judgments as costs a policy may cover. [3](https://www.marshmma.com/us/solutions/executive-and-professional-liability.html "Executive and Professional Liability | MMA") [6](https://www.simplybusiness.com/business-insurance/professional-liability-insurance/ "Professional Liability Insurance Coverage")

## 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)

## Simply Business: Online Small-Business Insurance Marketplace

Simply Business describes a digital marketplace and licensed-producer service for small businesses. The policy and selected insurer determine coverage, fees, servicing and claims responsibilities. [4](https://www.simplybusiness.com/about-us/ "Our Small Business Insurance Story") [5](https://www.simplybusiness.com/terms-conditions/ "Terms of Service")

[Simply Business profile](https://spot.insure/insurance-providers/simply-business)

## 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

### Which Professional Work Is Named

Simply Business names consultants, IT professionals, real-estate agents, and bookkeepers as examples for E&O referrals; MMA names specialist professional lines including architects and engineers and lawyers. If your work spans a less typical profession, ask each about the specific class and form rather than treating the examples as eligibility guarantees. [3](https://www.marshmma.com/us/solutions/executive-and-professional-liability.html "Executive and Professional Liability | MMA") [6](https://www.simplybusiness.com/business-insurance/professional-liability-insurance/ "Professional Liability Insurance Coverage")

### Placement Scope and Buying Route

Simply Business describes an online process to answer business questions, compare quotes, and select a policy, subject to panel-member approval before binding. MMA asks organizations to contact an adviser or specialist, so the route differs before you see a bound offer. [3](https://www.marshmma.com/us/solutions/executive-and-professional-liability.html "Executive and Professional Liability | MMA") [5](https://www.simplybusiness.com/terms-conditions/ "Terms of Service")

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

- Does the Simply Business panel have an E&O option for your exact services, and which costs are covered by its wording? [6](https://www.simplybusiness.com/business-insurance/professional-liability-insurance/ "Professional Liability Insurance Coverage")
- Which MMA specialist will handle your profession, and what carrier, form, and binding steps apply? [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) | Professional liability (E&O) insurance through Simply Business |
| --- | --- | --- |
| 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..) | Confirm in your quote. |
| 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..) | Simply Business lists consultants, IT professionals, real-estate agents and bookkeepers among the business examples for which it can help find E&O coverage. The examples do not guarantee eligibility. [6](https://www.simplybusiness.com/business-insurance/professional-liability-insurance/ "Professional Liability Insurance Coverage") (Evidence: Company-reported; scope: Company-published professional-errors-omissions information for U.S. small businesses; availability and actual policy terms depend on the insurer, state and buyer..) |
| 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 page describes protection for claims tied to professional work and lists attorney fees, court costs, settlements and judgments as costs that may be covered; policy wording controls. [6](https://www.simplybusiness.com/business-insurance/professional-liability-insurance/ "Professional Liability Insurance Coverage") (Evidence: Company-reported; scope: Company-published professional-errors-omissions information for U.S. small businesses; availability and actual policy terms depend on the insurer, state and buyer..) |
| 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..) | Confirm in your quote. |
| 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 company describes an online flow to answer business questions, compare quotes and select a policy. Its Terms say an online quote is not guaranteed and binding requires panel-member approval. [6](https://www.simplybusiness.com/business-insurance/professional-liability-insurance/ "Professional Liability Insurance Coverage") [5](https://www.simplybusiness.com/terms-conditions/ "Terms of Service") (Evidence: Company-reported; scope: Company-published professional-errors-omissions information for U.S. small businesses; availability and actual policy terms depend on the insurer, state and buyer..) |

## Full Comparison

- [Marsh McLennan Agency vs Simply Business](https://spot.insure/compare/marsh-mclennan-agency-vs-simply-business): 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 Simply Business Commercial Property Insurance](https://spot.insure/compare/marsh-mclennan-agency-vs-simply-business/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 Simply Business Professional Liability (E&O) Insurance](https://spot.insure/compare/aig-vs-simply-business/professional-errors-omissions)
- [Alliance Risk vs Simply Business Professional Liability (E&O) Insurance](https://spot.insure/compare/alliance-risk-vs-simply-business/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 Simply Business Professional Liability (E&O) Insurance](https://spot.insure/compare/at-bay-vs-simply-business/professional-errors-omissions)
- [Beazley vs Simply Business Professional Liability (E&O) Insurance](https://spot.insure/compare/beazley-vs-simply-business/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.

### Simply Business

4. [Our Small Business Insurance Story](https://www.simplybusiness.com/about-us/). Simply Business; Opening description and audience; digital marketplace, business types and U.S. service.. Accessed 2026-09-29.
5. [Terms of Service](https://www.simplybusiness.com/terms-conditions/). Simply Business; Dated June 30, 2026; §1 lines 22–28; §8 lines 87–113; §10 lines 143–149; §19 line 211.. Accessed 2026-09-29.
6. [Professional Liability Insurance Coverage](https://www.simplybusiness.com/business-insurance/professional-liability-insurance/). Simply Business; Coverage lines 45–100; buyer examples lines 101–158; online quote steps lines 237–260.. Accessed 2026-09-29.

### 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.

## 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).

## Simply Business Reviews

Review Score: 5.7 / 10 from 4 rated sources, equally weighted.

Customers disagree about Simply Business. Trustpilot shows 4.3 out of 5 from 1,901 reviews, but BBB customers give it 1.95 from 20 reviews and ConsumerAffairs shows 1.0.

- Trustpilot: TrustScore 4.3 (out of 5); 1901 reviews. Simply Business US Trustpilot profile. Reviews are not tied to a specific insurance line or insurer. Period: profile accessed 2026-09-29; 419 in last 12 months. Checked 2026-09-29. [Simply Business US Reviews](https://www.trustpilot.com/review/simplybusiness.com)
- ConsumerAffairs: ConsumerAffairs header rating 1.0 (out of 5 (breakdown conflicts with review filters)); 148 reviews. ConsumerAffairs Simply Business page, broad business-insurance context; not line-specific. Period: page updated 2026-09-17; denominator unresolved. Checked 2026-09-29. [Simply Business Reviews](https://www.consumeraffairs.com/insurance/simply-business.html)
- BBB: BBB business grade B+ (BBB letter grade). BBB profile classifies Simply Business as an insurance agency; business grade, consumer-review average and complaint ledger are separate measures, none is line-specific. Period: profile accessed 2026-09-29. Checked 2026-09-29. [Simply Business BBB Business Profile](https://www.bbb.org/us/ma/boston/profile/insurance-agency/simply-business-0021-539591); [Simply Business BBB Complaints](https://www.bbb.org/us/ma/boston/profile/insurance-agency/simply-business-0021-539591/complaints); [Simply Business BBB Customer Reviews](https://www.bbb.org/us/ma/boston/profile/insurance-agency/simply-business-0021-539591/customer-reviews)
- BBB: BBB customer review average 1.95 (out of 5); 20 reviews. BBB customer-review average for the Simply Business profile (Boston, MA). Separate from the business grade. Period: BBB review page checked 2026-09-29. Checked 2026-09-29. [Simply Business BBB Customer Reviews](https://www.bbb.org/us/ma/boston/profile/insurance-agency/simply-business-0021-539591/customer-reviews)

Reviewed 2026-09-29. [Read the sourced review](https://spot.insure/insurance-providers/simply-business/reviews).

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