Coalition vs Marsh Professional Liability (E&O) Insurance

Coalition bundles professional liability only with its own cyber quote; Marsh brokers it for specialized industries with in-house specialists.

What Is Coalition Insurance?

Coalition offers cyber insurance and technology E&O alongside cyber risk-management services. Its U.S. products are distributed through insurance producers, with separate admitted and surplus-lines routes and an executive-risk product suite. ^1,^2,^3,⁴

Read the Coalition profile

What Is Marsh?

Marsh is a global insurance broker and risk advisor. In the United States it places coverage through core Marsh teams and through Marsh McLennan Agency for many middle-market buyers, including technology, cyber, property, casualty and benefits programs. ^7,^8,^9,¹⁰

Read the Marsh profile

What Is Professional Errors and Omissions (E&O) Insurance?

Professional errors and omissions (E&O) insurance, also called professional liability insurance, addresses claims that professional services or advice caused a client financial loss. What's covered depends on the services actually scheduled in the policy, not the product label alone. ^13,^14,^15,¹⁶

Read the full coverage guide

Key Differences in Professional Liability (E&O) Insurance

One Company's Add-On Versus a Broker's Placement

Coalition designs and sells Miscellaneous Professional Liability itself as an add-on to its own Active Cyber Insurance quote. Marsh, including its Marsh McLennan Agency division, instead places professional liability coverage with outside insurers it does not name on either reviewed page. ⁵ ¹¹

Industry Focus

Coalition markets MPL to any business performing professional services, naming consultants, marketing and PR firms, staffing firms, printers and property managers. Marsh's professional liability practice instead names specialized industries it serves, including banking and broker/dealers, insurance companies and asset managers, merchant banking and venture capital, and healthcare and biotechnology. ⁵ ¹¹

In-House Expertise Versus In-House Claims Handling

Coalition says its in-house claims team manages both MPL and cyber claims in one place, describing a coordinated process for the policyholder. Marsh instead says it employs attorneys, economists and actuaries alongside coverage specialists to assess a client's professional liability exposure before a policy is placed, a pre-placement service rather than a claims-handling one. ⁵ ¹¹

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

Ask Coalition whether MPL is available without also buying Active Cyber Insurance, since the reviewed page describes it only as an add-on. ⁵
Ask Marsh which insurer it's proposing to place your professional liability policy with. ¹¹
Ask Coalition which insurer would issue the MPL policy, since its disclaimer page has no named "Admitted MPL" section. ⁶
Confirm whether your industry fits Coalition's cyber-linked eligibility or Marsh's specialized-industry placement instead. ⁵ ¹¹

Offering Details

Coalition vs Marsh Professional Liability (E&O) Insurance: documented features by provider

Criteria	Coalition Miscellaneous Professional Liability (MPL)	Marsh Professional Liability Insurance Brokerage
Role in This Line	Coalition designs and distributes MPL as an add-on coverage that combines with certain Active Cyber Insurance policies, sold through appointed brokers. ⁵Company-reported. Miscellaneous Professional Liability product page as read on 2026-09-23.	Marsh's financial and professional liability practice places professional liability (errors and omissions) insurance; MMA also places E&O coverage within its executive and professional liability practice for middle-market clients. ^11,¹²Company-reported. Marsh professional liability page and MMA executive and professional liability page.
Issuing Insurer	Coalition's disclaimer page has named sections for admitted cyber, non-admitted cyber, and admitted executive risk, but no equivalent 'Admitted MPL' section, indicating MPL is placed on a non-admitted (surplus lines) basis with unaffiliated insurers the disclaimer does not name. ⁶Not publicly disclosed. U.S. Disclaimers page as read on 2026-09-23; the buyer's declarations page names the actual issuing insurer.	The reviewed pages do not name a specific professional liability insurer. ^11,¹²Not publicly disclosed. Marsh professional liability page and MMA executive and professional liability page as read on 2026-09-23.
Who It’s For	Coalition markets MPL to any business that performs professional services, naming examples such as consultants, marketing and PR firms, staffing firms, printers, interior decorators, photographers and videographers, and property managers. ⁵Company-reported. Miscellaneous Professional Liability product page as read on 2026-09-23.	Marsh names specialized industries its professional liability experts serve, including banking and broker/dealers, insurance companies and asset managers, merchant banking and venture capital, accountants, attorneys, architects and engineers, media and entertainment, technology, and healthcare and biotechnology. ¹¹Company-reported. Marsh professional liability page, What We Offer section.
Coverage Features	Coalition says MPL covers defense costs, settlements, judgments, and other expenses from claims of errors and omissions in professional services, including negligence, failure to provide service, and misstatements about the service performed, on a duty-to-defend basis even when the business is not ultimately at fault. ⁵Company-reported. Miscellaneous Professional Liability product page as read on 2026-09-23; the issued policy controls actual terms.	Marsh says professional liability coverage can protect a company against liability and defense costs from a claim alleging an error, omission or negligence in performing professional services, and that many policies also cover privacy violations and computer security breaches. ¹¹Company-reported. Marsh professional liability page opening description; illustrative policy description, not a specific policy form.
Risk Services	Not described in the reviewed sources.	Marsh says it employs attorneys, economists and actuaries alongside coverage specialists to assess a client's professional liability exposure from multiple angles, given the complexity of these risks. ¹¹Company-reported. Marsh professional liability page.
How to Apply	Coalition sells MPL only as an addition to an Active Cyber Insurance quote, saying it takes just a few extra questions to add, rather than as a stand-alone policy. ⁵Company-reported. Miscellaneous Professional Liability product page as read on 2026-09-23.	Not described in the reviewed sources.
Claims Support	Coalition says its in-house claims team manages both MPL and cyber claims in one place, which it describes as a smoother, more coordinated process for the policyholder. ⁵Company-reported. Miscellaneous Professional Liability product page as read on 2026-09-23; speed and efficiency descriptions are company-reported and not independently verified.	Not described in the reviewed sources.

Full Comparison

More Coalition vs Marsh Comparisons

Other Professional Liability (E&O) Insurance Comparisons

Sources

Coalition

Tech E&O Insurance Coverage. Coalition; Who needs Technology Errors & Omissions coverage? (organizations that provide a technology product or service for a fee); Combine Technology Errors & Omissions coverage with Active Cyber Insurance; Coalition Advantage. Accessed 2026-09-16.
U.S. Producer Compensation. Coalition; Insurance Producers; Base Commission; Contingent Commission; Business Production Incentive Programs; Non-Insurance Products. Accessed 2026-09-16.
Are there any differences between Coalition’s admitted and surplus lines products? Coalition; Cyber insurance coverage offered by Coalition: Coverage availability; Coverage offering. Accessed 2026-09-16.
Executive Risks. Coalition; FAQ: What type of businesses do you protect?, What limits do you offer? and What resources do you have for policyholders?; Product Offering: D&O, EPL, fiduciary, crime. Accessed 2026-09-16.
Miscellaneous Professional Liability. Coalition; Why Miscellaneous Professional Liability?; MPL Advantage; What does MPL cover?; What types of claims does MPL protect against?; What types of businesses could benefit from MPL?; Why does 'Duty to Defend' coverage matter? Accessed 2026-09-23.
U.S. Disclaimers. Coalition; Non-Admitted Cyber; Admitted Cyber; Admitted Executive Risk (names Zurich American Insurance Company, NAIC 16535); no 'Admitted MPL' or 'Admitted Tech E&O' section appears on the page. Accessed 2026-09-23.

Marsh

Marsh | Leader in risk, strategy, people, and investments. Marsh; Hero and capability tiles; FAQ: What does Marsh do?; industries served; Is Marsh the same as Marsh McLennan? January 2026 brand change. Accessed 2026-09-16.
Compensation guide for US clients. Marsh; US broking segments; broker role; retail commissions, client fees, wholesale, insurer consulting, contingent and supplemental commissions; Marsh LLC and Marsh USA LLC; page 3: broker role and Marsh & McLennan Agency segment; page 7: copyright © 2024 Marsh LLC. Accessed 2026-09-16.
Marsh McLennan Agency (MMA). Marsh; Middle-market US organizations; wholly-owned subsidiary; business insurance, employee health and benefits, retirement, private client. Accessed 2026-09-16.
Technology | Insurance Broking & Risk Management. Marsh; Opening Technology Practice description; practice links including data center insurance, fintech and Stratus; Talk to us. Accessed 2026-09-16.
Professional liability. Marsh; Opening description; What We Offer: specialized industries served (banking, insurance/asset managers, merchant banking/venture capital, accountants/attorneys/architects/engineers, media/communications/entertainment, technology, healthcare/biotechnology). Accessed 2026-09-23.
Expert Executive and Professional Liability Insurance. Marsh McLennan Agency; Our policies include D&O, E&O, EPL, commercial crime/fidelity, network security privacy risk/cyber, fiduciary, media liability, IP, architects and engineers, lawyers professional, and kidnap and ransom. Accessed 2026-09-23.

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.