---
title: "Aon vs Gallagher: Professional Liability (E&O) Insurance"
description: "Aon tailors E&O placement for professional firms; Gallagher lists specific claim categories and offers online, phone and callback quote routes."
canonical: "https://spot.insure/compare/aon-vs-gallagher/professional-errors-omissions"
page-type: "line-comparison"
updated-at: "2026-09-30"
comparison-pair: "aon-vs-gallagher"
provider-a: "aon"
provider-b: "gallagher"
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/aon-vs-gallagher/professional-errors-omissions)

## Agent Guide

**What this page is:** Focused comparison of Aon and Gallagher 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 Aon versus Gallagher. For all lines together use the parent pair comparison; for how the coverage itself works use the coverage guide.

**Questions this page answers:**
- Aon vs Gallagher for Professional Liability (E&O) Insurance: how do they differ?
- Which is better for Professional Liability (E&O) Insurance, Aon or Gallagher?
- What does Aon or Gallagher 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 Aon or Gallagher?

**Key facts:**
- Line: Professional Liability (E&O) Insurance. Providers: Aon and Gallagher.
- 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:**
- [Aon vs Gallagher](https://spot.insure/compare/aon-vs-gallagher) — 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
- [Aon profile](https://spot.insure/insurance-providers/aon) — provider profile (evidence)
- [Gallagher profile](https://spot.insure/insurance-providers/gallagher) — provider profile (evidence)
- [Aon vs Gallagher Commercial Property Insurance](https://spot.insure/compare/aon-vs-gallagher/commercial-property) — sibling comparison (other line, or other pair for this line)
- [Aon vs Gallagher Crime Insurance](https://spot.insure/compare/aon-vs-gallagher/crime) — sibling comparison (other line, or other pair for this line)
- [Aon vs Gallagher Cyber Insurance](https://spot.insure/compare/aon-vs-gallagher/cyber) — sibling comparison (other line, or other pair for this line)
- [Aon vs Gallagher D&O Insurance](https://spot.insure/compare/aon-vs-gallagher/directors-officers) — sibling comparison (other line, or other pair for this line)
- [Aon vs Gallagher Employment Practices Liability Insurance](https://spot.insure/compare/aon-vs-gallagher/employment-practices) — sibling comparison (other line, or other pair for this line)
- [Aon vs Gallagher Fiduciary Liability Insurance](https://spot.insure/compare/aon-vs-gallagher/fiduciary) — sibling comparison (other line, or other pair for this line)
- [Aon vs Gallagher General Liability Insurance](https://spot.insure/compare/aon-vs-gallagher/general-liability) — sibling comparison (other line, or other pair for this line)
- [Aon vs Gallagher Kidnap and Ransom Insurance](https://spot.insure/compare/aon-vs-gallagher/kidnap-ransom) — sibling comparison (other line, or other pair for this line)
- [Aon vs Gallagher Workers’ Compensation Insurance](https://spot.insure/compare/aon-vs-gallagher/workers-compensation) — sibling comparison (other line, or other pair for this line)
- [AIG vs Aon Professional Liability (E&O) Insurance](https://spot.insure/compare/aig-vs-aon/professional-errors-omissions) — sibling comparison (other line, or other pair for this line)
- [AIG vs Gallagher Professional Liability (E&O) Insurance](https://spot.insure/compare/aig-vs-gallagher/professional-errors-omissions) — sibling comparison (other line, or other pair for this line)
- [Alliance Risk vs Aon Professional Liability (E&O) Insurance](https://spot.insure/compare/alliance-risk-vs-aon/professional-errors-omissions) — sibling comparison (other line, or other pair for this line)
- [Alliance Risk vs Gallagher Professional Liability (E&O) Insurance](https://spot.insure/compare/alliance-risk-vs-gallagher/professional-errors-omissions) — sibling comparison (other line, or other pair for this line)
- [Aon vs At-Bay Professional Liability (E&O) Insurance](https://spot.insure/compare/aon-vs-at-bay/professional-errors-omissions) — sibling comparison (other line, or other pair for this line)
- [Aon vs The Baldwin Group Professional Liability (E&O) Insurance](https://spot.insure/compare/aon-vs-baldwin/professional-errors-omissions) — sibling comparison (other line, or other pair for this line)

# Aon vs Gallagher: How Do They Compare for Professional Liability (E&O) Insurance?

Aon tailors E&O placement for professional firms; Gallagher lists specific claim categories and offers online, phone and callback quote routes.

## Research Scope and Use

Use this comparison to evaluate Aon and Gallagher 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

Aon describes tailored E&O structures through a professional-services practice. Gallagher Small Business lists negligence, copyright and past-work allegations and offers multiple quote routes. [3](https://www.aon.com/en/capabilities/risk-transfer/professional-services-practice "Professional Services Practice") [9](https://www.gallaghersmallbusiness.com/insurance-products/professional-liability-eo/ "Errors and Omissions Insurance")

## What Is Aon?

Aon’s U.S. Commercial Risk terms describe brokerage for certain insurance programs, while its Middle Market page describes a dedicated practice for mid-sized organizations across North America. The public materials reviewed do not identify the licensed producer or insurer for a particular placement. Ask which entity will produce each line and which insurer will issue the policy; request jurisdiction details for the proposed placement and ask how compensation and claim notice work for your account. [1](https://www.aon.com/en/about/leadership-and-governance/brokerage-terms-of-service-for-commercial-risk-solutions-us "Commercial Risk Solutions U.S. Brokerage Terms of Service") [2](https://www.aon.com/en/capabilities/middle-market-clients "Middle Market Clients")

[Aon profile](https://spot.insure/insurance-providers/aon)

## What Is Gallagher?

Gallagher’s technology specialists serve startups through global enterprises, while its executive-risk team supports IPO and M&A needs; small firms seeking one simple digital quote should compare online agencies. [4](https://www.ajg.com/industries/technology-insurance/ "Technology Insurance") [5](https://www.gallaghersmallbusiness.com/technology-services/ "Insurance for Technology & IT Businesses") [6](https://www.ajg.com/insurance/executive-and-financial-risk-insurance/ "Executive and Financial Risk Insurance") [7](https://www.gallaghersmallbusiness.com/legal-information/ "Legal Information") [8](https://www.ajg.com/merger-partners/woodruff-sawyer-is-now-gallagher/ "Woodruff Sawyer Is Now Gallagher")

[Gallagher profile](https://spot.insure/insurance-providers/gallagher)

## 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](https://www.tdi.texas.gov/commercial/pl-faq.html "FAQ: Professional liability insurance") [11](https://www.iii.org/article/professional-liability-insurance "Professional liability insurance") [12](https://www.sba.gov/counseling/launch-your-business/#business-insurance "Get business insurance") [13](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

### Coverage and Policy Design

Aon says it tailors professional-liability structures for law, accounting and consulting firms but does not list policy triggers. Gallagher arranges E&O with partner carriers and says it can address negligence, personal injury, copyright infringement, punitive damages, and claims involving past work, temporary staff or contractors. Those examples give service businesses concrete wording to check against the policy, although Gallagher’s page does not name the issuing insurer. [3](https://www.aon.com/en/capabilities/risk-transfer/professional-services-practice "Professional Services Practice") [9](https://www.gallaghersmallbusiness.com/insurance-products/professional-liability-eo/ "Errors and Omissions Insurance")

### Buying Route and Terms

Gallagher recommends E&O for service businesses across technology, accounting, tax, healthcare, legal and other professions, and provides an online form, advisor phone line and callback option. Aon names a narrower professional-services audience and describes advisory placement. Neither reviewed record publishes limits or deductibles. Gallagher says insurers are selective and may request detailed underwriting information, so prepare operational and claims details before comparing quote timing and terms. [3](https://www.aon.com/en/capabilities/risk-transfer/professional-services-practice "Professional Services Practice") [9](https://www.gallaghersmallbusiness.com/insurance-products/professional-liability-eo/ "Errors and Omissions Insurance")

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

- Ask Gallagher which listed claim categories are included by the carrier and what limits and deductible apply. [3](https://www.aon.com/en/capabilities/risk-transfer/professional-services-practice "Professional Services Practice") [9](https://www.gallaghersmallbusiness.com/insurance-products/professional-liability-eo/ "Errors and Omissions Insurance")
- Ask Aon about eligible professions, underwriting information and the quote route for your firm. [3](https://www.aon.com/en/capabilities/risk-transfer/professional-services-practice "Professional Services Practice") [9](https://www.gallaghersmallbusiness.com/insurance-products/professional-liability-eo/ "Errors and Omissions Insurance")

## Offering Details

| Criteria | Aon Professional Liability / E&O brokerage and risk-advisory offering | Gallagher Small Business Errors and Omissions Insurance |
| --- | --- | --- |
| Role in This Line | Aon presents Professional Liability / E&O as a line its Professional Services Practice helps arrange or advise on for professional-service firms. Aon is describing a global brokerage and advisory service, not issuing the underlying policy. The producing legal entity and carrier for any particular placement are not named on this page. [3](https://www.aon.com/en/capabilities/risk-transfer/professional-services-practice "Professional Services Practice") (Evidence: Company-reported; scope: Aon’s global professional-services practice page. This establishes a marketed brokerage/advisory offering, not policy issuance or account-specific placement..) | Gallagher Small Business arranges errors and omissions (E&O) coverage with partner carriers rather than underwriting the policy itself. [9](https://www.gallaghersmallbusiness.com/insurance-products/professional-liability-eo/ "Errors and Omissions Insurance") (Evidence: Company-reported; scope: Gallagher Small Business's direct-to-small-business E&O product page..) |
| Issuing Insurer | The reviewed practice page does not name the insurer or producing legal entity for a specific placement. Ask for both on the quote and binder. [3](https://www.aon.com/en/capabilities/risk-transfer/professional-services-practice "Professional Services Practice") (Evidence: Not found in reviewed sources; scope: Aon’s global practice page as reviewed 2026-09-30; no state-specific placement schedule or buyer quote was reviewed. This does not establish that Aon cannot arrange a placement..) | The E&O product page does not name the insurer that would issue a given business's policy. [9](https://www.gallaghersmallbusiness.com/insurance-products/professional-liability-eo/ "Errors and Omissions Insurance") (Evidence: Not publicly disclosed; scope: Checked the E&O product page on 2026-09-23..) |
| Who It’s For | Aon identifies law, accounting and consulting firms as the audience for its global Professional Services Practice. That audience scope does not establish eligibility for every firm or other business. [3](https://www.aon.com/en/capabilities/risk-transfer/professional-services-practice "Professional Services Practice") (Evidence: Company-reported; scope: Audience described for Aon’s global professional-services practice. It does not establish U.S. state availability or underwriting eligibility for a placement..) | Gallagher recommends E&O for small businesses that provide a specific professional service, naming technology, insurance, accounting, tax, wealth management and legal services, and lists doctors, lawyers, accountants, nurses, caregivers, counselors, social workers and engineers as example professionals; it also notes that many client contracts require carrying E&O. [9](https://www.gallaghersmallbusiness.com/insurance-products/professional-liability-eo/ "Errors and Omissions Insurance") (Evidence: Company-reported; scope: Product page eligibility and recommended-professions lists; actual acceptance depends on underwriting..) |
| Coverage Features | Aon describes professional liability as addressing professional-services firms’ liability exposure and says it tailors coverage structures to a firm’s needs. It identifies E&O as a commonly used name for professional-liability insurance; actual policy terms are not stated. [3](https://www.aon.com/en/capabilities/risk-transfer/professional-services-practice "Professional Services Practice") (Evidence: Company-reported; scope: Aon’s marketing description of the brokerage/coverage area. The page is not the insurer’s policy form and does not establish an insured's entitlement to coverage..) | Gallagher describes E&O as protecting against client charges of negligence or injury tied to professional services, covering losses, attorney fees and court costs regardless of fault, and specifically responding to alleged or actual negligence, personal injury, copyright infringement, punitive damages, and claims against past work, temporary staff or independent contractors. [9](https://www.gallaghersmallbusiness.com/insurance-products/professional-liability-eo/ "Errors and Omissions Insurance") (Evidence: Company-reported; scope: Product page coverage description; the issued policy and its exclusions control. Note this record excludes medical malpractice, which the page treats as a separate specialized coverage covered under its own line..)<br><br>Gallagher's small-business team says the E&O market has seen consistent rate increases that have started to moderate, driven by higher claim frequency, litigation costs and a more litigious environment, and that insurers are more selective and require more detailed underwriting information. [9](https://www.gallaghersmallbusiness.com/insurance-products/professional-liability-eo/ "Errors and Omissions Insurance") (Evidence: Company-reported; scope: Product page market-commentary section; a general market view, not a quote for any specific business..) |
| Limits and Retentions | The reviewed page does not state a buyer-specific limit, retention, deductible or other placement terms. Confirm these in the quote, bond or issued policy. [3](https://www.aon.com/en/capabilities/risk-transfer/professional-services-practice "Professional Services Practice") (Evidence: Not publicly disclosed; scope: Aon’s global practice page as reviewed 2026-09-30; no quote, bond form or issued policy was reviewed..) | The E&O product page does not publish limits, deductibles or premiums; it directs prospective buyers to request a quote instead. [9](https://www.gallaghersmallbusiness.com/insurance-products/professional-liability-eo/ "Errors and Omissions Insurance") (Evidence: Not publicly disclosed; scope: Checked the E&O product page on 2026-09-23..) |
| Risk Services | Aon says its professional-services advisors use industry knowledge, insights, data and tools to support risk-management and human-capital decisions. This is a company-described advisory service, not a claim outcome or policy benefit. [3](https://www.aon.com/en/capabilities/risk-transfer/professional-services-practice "Professional Services Practice") (Evidence: Company-reported; scope: Company-reported advisory services on Aon’s global practice page; account-specific service scope is not stated..) | Confirm in your quote. |
| How to Apply | Confirm in your quote. | Gallagher offers an online quote form, a small business advisor phone line (1-833-292-9441, Monday through Friday, 8 a.m. to 5 p.m., continental U.S.), and a scheduled callback request to start an E&O quote. [9](https://www.gallaghersmallbusiness.com/insurance-products/professional-liability-eo/ "Errors and Omissions Insurance") (Evidence: Company-reported; scope: Product page "Get Covered Now" section..) |

## Full Comparison

- [Aon vs Gallagher](https://spot.insure/compare/aon-vs-gallagher): 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.
- [Aon vs Gallagher Commercial Property Insurance](https://spot.insure/compare/aon-vs-gallagher/commercial-property)
- [Aon vs Gallagher Crime Insurance](https://spot.insure/compare/aon-vs-gallagher/crime)
- [Aon vs Gallagher Cyber Insurance](https://spot.insure/compare/aon-vs-gallagher/cyber)
- [Aon vs Gallagher D&O Insurance](https://spot.insure/compare/aon-vs-gallagher/directors-officers)
- [Aon vs Gallagher Employment Practices Liability Insurance](https://spot.insure/compare/aon-vs-gallagher/employment-practices)
- [Aon vs Gallagher Fiduciary Liability Insurance](https://spot.insure/compare/aon-vs-gallagher/fiduciary)
- [Aon vs Gallagher General Liability Insurance](https://spot.insure/compare/aon-vs-gallagher/general-liability)
- [Aon vs Gallagher Kidnap and Ransom Insurance](https://spot.insure/compare/aon-vs-gallagher/kidnap-ransom)
- [Aon vs Gallagher Workers’ Compensation Insurance](https://spot.insure/compare/aon-vs-gallagher/workers-compensation)
- [AIG vs Aon Professional Liability (E&O) Insurance](https://spot.insure/compare/aig-vs-aon/professional-errors-omissions)
- [AIG vs Gallagher Professional Liability (E&O) Insurance](https://spot.insure/compare/aig-vs-gallagher/professional-errors-omissions)
- [Alliance Risk vs Aon Professional Liability (E&O) Insurance](https://spot.insure/compare/alliance-risk-vs-aon/professional-errors-omissions)
- [Alliance Risk vs Gallagher Professional Liability (E&O) Insurance](https://spot.insure/compare/alliance-risk-vs-gallagher/professional-errors-omissions)
- [Aon vs At-Bay Professional Liability (E&O) Insurance](https://spot.insure/compare/aon-vs-at-bay/professional-errors-omissions)
- [Aon vs The Baldwin Group Professional Liability (E&O) Insurance](https://spot.insure/compare/aon-vs-baldwin/professional-errors-omissions)

## Sources

### Aon

1. [Commercial Risk Solutions U.S. Brokerage Terms of Service](https://www.aon.com/en/about/leadership-and-governance/brokerage-terms-of-service-for-commercial-risk-solutions-us). Aon; Lines 120–127: certain-program broker-of-record scope, consultation, application assistance, client signature and bind instruction, and account administration; lines 140–147: variable and contingent compensation, potential placement incentive, and client request route; lines 206–213: no price guarantee and surplus-lines limitations; lines 229–231: client insurer-notice duty unless separately agreed.. Accessed 2026-09-29.
2. [Middle Market Clients](https://www.aon.com/en/capabilities/middle-market-clients). Aon; Lines 125–132: mid-sized organizations and middle-market framing; lines 165–173: dedicated practice and North America statement; lines 188–224: Commercial Risk capabilities. No numeric company-size cutoff or U.S.-only eligibility rule is stated on the reviewed page.. Accessed 2026-09-29.
3. [Professional Services Practice](https://www.aon.com/en/capabilities/risk-transfer/professional-services-practice). Aon; Named professional-services audiences and global advisory role, lines 125–128; line offerings and explanations lines 131–190; contact link lines 120–122. Global practice page; no U.S. state or account-specific placement schedule.. Accessed 2026-09-30.

### Gallagher

4. [Technology Insurance](https://www.ajg.com/industries/technology-insurance/). Gallagher; Introduction; Solutions and coverages for the technology industry: Technology errors and omissions including cyber, Intellectual property insurance, Product liability, Employee benefits; Data-driven insights; global network. Accessed 2026-09-16.
5. [Insurance for Technology & IT Businesses](https://www.gallaghersmallbusiness.com/technology-services/). Gallagher Small Business; Protection for IT Professionals & Their Technology-Based Businesses; recommended coverage menu, including Surety Bond Programs; Connect With An Advisor. Accessed 2026-09-16.
6. [Executive and Financial Risk Insurance](https://www.ajg.com/insurance/executive-and-financial-risk-insurance/). Gallagher; Opening (insurance broking and placement); three key services; Directors and Officers; IPO and direct listings; Employment Practices; Fiduciary; Employee Dishonesty (Crime) and Fidelity Bond; Kidnap, Ransom and Extortion; M&A Transactional Insurance. Accessed 2026-09-16.
7. [Legal Information](https://www.gallaghersmallbusiness.com/legal-information/). Gallagher Small Business; Producer identification immediately above Quick Links. Accessed 2026-09-16.
8. [Woodruff Sawyer Is Now Gallagher](https://www.ajg.com/merger-partners/woodruff-sawyer-is-now-gallagher/). Gallagher; Opening; Executive and Financial Risk consulting; Continued access to client portals; contact form. Accessed 2026-09-16.
9. [Errors and Omissions Insurance](https://www.gallaghersmallbusiness.com/insurance-products/professional-liability-eo/). Gallagher Small Business; What is Errors and Omissions Insurance?; Do you need Errors and Omissions insurance?; Recommended for professionals including; E&O trends; An E&O policy protects you from; Consider this claim scenario; Get Covered Now. Accessed 2026-09-23.

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

10. [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.
11. [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.
12. [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.
13. [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.

## Aon Reviews

Review Score: 6.1 / 10 from 3 rated sources, equally weighted.

Public ratings for Aon are low: Trustpilot shows 1.2 out of 5 from 782 reviews, and BBB shows 1.6 from five. Aon is a global firm, so those pages mostly reflect other parts of the business, not large U.S. commercial accounts.

- J.D. Power: Aon study score 822 (out of 1000). Historical 2017 large-commercial-broker study; U.S. and Canada commercial insurance decision-makers at large organizations. J.D. Power reports 2,506 evaluations across the study, not Aon-specific responses; the Aon respondent count is not stated. Period: 2017 study; ranked 3rd among large commercial brokers; study-wide population 2,506, not Aon review count. Checked 2026-09-29. [Diversity of Offerings Becomes Key Differentiator for Large Commercial Insurers, JD Power Finds](https://www.jdpower.com/business/press-releases/jd-power-2017-large-commercial-insurance-study)
- Trustpilot: TrustScore 1.2 (out of 5); 782 reviews. Global www.aon.com profile merged with other Aon profiles; mixed experiences include pensions, travel, professional indemnity and Australian business quotation service. The two latter complaints are individual unverified allegations, not evidence of U.S. commercial-placement outcomes or insurer fault. Trustpilot says reviews may not be representative because the company has not recently invited reviews. Period: Displayed 2026-09-29; page separately showed 198 reviews in the last 12 months. Checked 2026-09-29. [Aon Reviews](https://www.trustpilot.com/review/www.aon.com)
- BBB: BBB business grade B− (BBB letter grade; stated reason: failure to respond to two filed complaints). BBB of Chicago & Northern Illinois profile for Aon plc; the business grade is BBB’s own measure, not customer stars. Checked 2026-09-29. [Aon plc | BBB Business Profile](https://www.bbb.org/us/il/chicago/profile/insurance-companies/aon-plc-0654-5291)
- BBB: BBB customer review average 1.6 (out of 5); 5 reviews. BBB of Chicago & Northern Illinois customer reviews for Aon plc; some reviews are about employee-benefit and medical-expense issues. Period: checked 2026-09-29. Checked 2026-09-29. [Aon plc | BBB Reviews](https://www.bbb.org/us/il/chicago/profile/insurance-companies/aon-plc-0654-5291/customer-reviews)

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

## Gallagher Reviews

Review Score: 9.3 / 10 from 3 rated sources, equally weighted.

Gallagher has strong Trustpilot feedback and a favorable historical large-commercial survey result. Neither directly measures today’s US small-business service.

- J.D. Power: Broker satisfaction rank/score 2nd / 855 (Rank / 1,000-point score). 2017 US/Canada large-commercial broker study; participating organizations had at least $100m annual revenue or operating budget; not small-business-specific. Period: 2017 study. Checked 2026-09-25. [JD Power 2017 Large Commercial Insurance Study](https://www.jdpower.com/business/press-releases/jd-power-2017-large-commercial-insurance-study)
- Trustpilot: TrustScore 4.6 (5 stars); 8190 reviews. Global Arthur J. Gallagher & Co. brand profile; mixed countries and insurance lines, not US commercial-only. Period: 976 reviews in prior 12 months; observed 2026-09-25. Checked 2026-09-25. [Gallagher Reviews | Trustpilot](https://www.trustpilot.com/review/www.ajg.com)
- BBB: BBB grade A+ (BBB letter grade). BBB corporate headquarters profile for Gallagher, Rolling Meadows, Illinois. Checked 2026-09-25. [Gallagher | BBB Business Profile](https://www.bbb.org/us/il/rolling-meadows/profile/insurance-companies/gallagher-0654-23000270)

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

## Agent and Developer Resources

- [Markdown page](https://spot.insure/compare/aon-vs-gallagher/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)