Marsh McLennan Agency vs 
WTW: How Do They Compare for Professional Liability (E&O) 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. 1,2
Read the Marsh McLennan Agency profile
Read the Marsh McLennan Agency Professional Liability (E&O) Insurance page
What Is WTW?
WTW is an insurance broker whose documented services include manufacturing risk-program design and specialist property and cargo programs. Its marketed property scope includes residential real-estate stakeholders and a separate integrated data-center program; other named capabilities vary in date and geography. 4,5,6,7,8
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. 10,11,12,13
Key Differences in Professional Liability (E&O) Insurance
Which Professional Work Is Named
WTW’s North American terms say it acts as an intermediary, seeks a formal insurer commitment after a client orders binding, and reviews policy documents against negotiated terms. MMA also describes arranging professional placement, but its overview does not spell out those binding and document-review steps; ask both teams who confirms the final policy matches the quote. 3 8
Placement Scope and Buying Route
WTW’s materials identify E&O in financial lines for residential real-estate stakeholders, while MMA names architects-and-engineers and lawyers professional lines. If your business is outside those named examples, request the exact practice and form rather than infer availability from a broad professional-liability label. 3 9
What to Confirm in Professional Liability (E&O) Insurance Quotes
Review Scores
These averages can combine ratings for different products, locations, and customer groups, including approximate BBB grade conversions. Read each review for the sources, scope, and calculation.
Marsh McLennan Agency
Review Score
2 rated sources
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.[8][9][1]
Read Marsh McLennan Agency reviewsWTW
Review Score
1 rated source
WTW has little useful review evidence for a business buyer. Its one counted score is 807 out of 1,000 from a 2017 J.D. Power study of large commercial brokers, and Trustpilot's 2.1 from 9 reviews isn't counted.[4][2]
Read WTW reviewsOffering Details
Marsh McLennan Agency vs WTW: Professional Liability (E&O) Insurance: documented features by provider
| Criteria | Marsh McLennan Agency professional errors omissions (official overview) | WTW Professional Errors and Omissions Brokerage |
|---|---|---|
| Role in This Line | Marsh McLennan Agency describes arranging professional errors omissions for the audience stated on the cited product page. 3Company-reported. 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. | Under WTW's North American Corporate Risk & Broking terms, WTW normally acts as the client's insurance intermediary for engagements governed by those terms. 9Company-reported. Terms for applicable North American Corporate Risk & Broking engagements. WTW also discloses separate insurer-side services in some arrangements; this does not determine the role in a specific engagement. |
| Issuing Insurer | Confirm in your quote. | The reviewed WTW sources do not identify an issuing insurer for a specific professional errors omissions placement. 9,8,7Not publicly disclosed. This is a gap in the cited marketing, annual-report, and brokerage materials; it does not mean WTW lacks insurer markets. Confirm the carrier on the quote and issued policy. |
| Who It’s For | Organizations seeking professional liability placement; source does not imply all professions share one policy. 3Company-reported. 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. |
| 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. 3Company-reported. 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. | WTW's FY2024 annual report describes professional-liability solutions within FINEX; its residential practice lists errors-and-omissions among financial lines for residential real-estate stakeholders. 8,7Company-reported. The report is historical and group-level; the residential E&O reference is segment-specific and based on retained official indexed text. Neither establishes current terms or eligibility outside that segment. |
| 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. 3Not publicly disclosed. Only the cited marketing page was reviewed for published limit and retention information; no policy-form entitlement is inferred. | The reviewed sources do not state a buyer-specific professional errors omissions limit, retention, or deductible. 9,8,7Not publicly disclosed. No limit or deductible is inferred from general marketing or WTW's brokerage role; the insurer's quote and issued forms control. |
| Risk Services | Confirm in your quote. | WTW's North American terms describe reviewing binders, policies, and endorsements against the terms negotiated with the insurer. 9Company-reported. Broker document-review process under the cited terms, when WTW handles this line's placement. It does not certify that a policy covers a claim or replace the issued wording. |
| 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. 3Company-reported. 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. | WTW's North American terms say an insurer quote is not confirmation of coverage; if the client orders binding, WTW seeks a formal insurer commitment, typically a binder. 9Company-reported. Applies to placements governed by the cited North American Corporate Risk & Broking terms. It does not establish a self-service quote route or promise coverage availability for this line. |
Full Comparison
More Marsh McLennan Agency vs WTW Comparisons
Other Professional Liability (E&O) Insurance Comparisons
Sources
Marsh McLennan Agency
- Who We Are. 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.
- Small Business Insurance Solutions. 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.
- Executive and Professional Liability | MMA. Marsh McLennan Agency; E&O, architects and engineers, and lawyers professional lines are named in the policy suite. Accessed 2026-09-30.
WTW
- Manufacturing. WTW; “How WTW can help manufacturers”; “How we serve our clients”; North America licensed-entity disclaimer. Accessed 2026-09-28.
- Digital Infrastructure Protector. WTW; Integrated policy coverage for building, operational property, marine and cargo under one policy; integrated data-center construction/operations; cyber and liability protection in broader solution; separate-policy preference caveat; capacity and North America licensed-entity disclaimer. Accessed 2026-09-29.
- Marine. WTW; “Our solutions” cargo brokerage; marine specialist count; claims advice and average-adjuster service; North America licensed-entity disclaimer. Accessed 2026-09-28.
- Residential | WTW. WTW; “Specialized insurance products”: lists property insurance and financial lines, including errors and omissions; inspected official indexed text 2026-09-29. Direct reader access failed; indexed page crawl was about five months old. Accessed 2026-09-29.
- WTW 2024 Form 10-K. U.S. Securities and Exchange Commission / Willis Towers Watson Public Limited Company; Part I, Item 1, FINEX and Surety business descriptions: the 2024 annual report identifies management and professional liability, employment practices, crime, cyber and M&A insurance solutions, and a global bond-placement team; indexed passages rechecked 2026-09-29. Accessed 2026-09-29.
- Corporate Risk & Broking Brokerage Terms, Conditions & Disclosures (Canada & US). WTW; Document dated 2025-06-01; pp. 4–6: broker/intermediary role, quote versus binding process, review of binders/policies/endorsements, claims reporting and affiliate disclosures. Reused from the current WTW provider source record after direct PDF retrieval was blocked. Accessed 2026-09-28.
Professional Liability (E&O) Insurance Guide
- FAQ: Professional liability insurance. Texas Department of Insurance; What’s professional liability coverage?; What types of damages…; What’s general liability insurance?; Do I need professional liability… if I have general liability…?; Is professional liability insurance required?; Can a client require…?; What’s the difference between occurrence policies and claims-made policies. Accessed 2026-09-16.
- Professional liability insurance. Insurance Information Institute; Opening paragraphs (professional services/advice and E&O name); Claims not covered by general liability; What types of businesses need professional liability insurance?; What’s covered… and what’s not (claims-made versus occurrence, defense and judgments, non-financial/intentional limits, BOP/in-home exclusion). Accessed 2026-09-16.
- Get business insurance. U.S. Small Business Administration; Six common types of business insurance table. Accessed 2026-09-16.
- Professional Liability – US Direct Errors and Omissions Insurance. Hiscox Inc. specimen; About this Policy / Coverage for Claims Made Against You; I.A Insuring Agreement; I.B Defense; I.C Settlement; II.A Notice of Claims; II.C Optional Extended Reporting Period; III.A, III.K, III.M, III.R, III.S Exclusions; IV.A–B Limits and Deductible; VI.O Professional Services; VI.U Wrongful Act. Accessed 2026-09-16.
