---
title: "At-Bay vs Heffernan Insurance Brokers Professional Liability (E&O) Insurance"
description: "At-Bay lists MPL as a named product with specific coverage features; Heffernan lists E&O as one line among general small-business coverages."
canonical: "https://spot.insure/compare/at-bay-vs-heffernan/professional-errors-omissions"
page-type: "line-comparison"
updated-at: "2026-09-23"
---

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# At-Bay vs Heffernan Insurance Brokers Professional Liability (E&O) Insurance

At-Bay lists MPL as a named product with specific coverage features; Heffernan lists E&O as one line among general small-business coverages.

## Research Scope and Use

Use this comparison to evaluate At-Bay and Heffernan Insurance Brokers 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

At-Bay dedicates a product page to Miscellaneous Professional Liability with specific coverage features like an 80/20 hammer clause. Heffernan lists errors and omissions as one line item within its general small-business coverage page, without a dedicated product page or listed coverage features. [3](https://www.at-bay.com/insurance/mpl/ "MPL Insurance: Coverage Highlights & Appetite") [10](https://www.heffins.com/business-insurance/small-business/ "Small Business Insurance")

## What Is At-Bay Insurance?

At-Bay offers Cyber, Tech E&O, and miscellaneous professional liability insurance through its disclosed insurance agency and surplus lines broker. Its Stance security services have policy eligibility conditions, with managed detection and response sold separately. [1](https://www.at-bay.com/insurance/ "Cyber, Tech E&O & Professional Liability Insurance") [2](https://www.at-bay.com/stance/ "At-Bay Stance")

[At-Bay profile](https://spot.insure/insurance-providers/at-bay)

## What Is Heffernan Insurance Brokers?

Heffernan Insurance Brokers is an independent, Walnut Creek–headquartered retail brokerage that arranges business insurance, employee benefits, and related services. Its technology practice markets to mid- and late-stage companies, including venture-funded and pre-IPO firms. [7](https://www.heffins.com/about-us/our-story/ "Our Story") [8](https://www.heffins.com/business-insurance/technology/ "Technology Company Insurance") [9](https://www.heffins.com/business-insurance/ "Heffernan Business Insurance Brokerage")

[Heffernan Insurance Brokers profile](https://spot.insure/insurance-providers/heffernan)

## 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. [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

### Dedicated Product Page Versus a Line-Item Mention

At-Bay dedicates a product page to Miscellaneous Professional Liability, listing features including automatic coverage for acquired subsidiaries, independent-contractor coverage, and disciplinary-proceedings defense. [3](https://www.at-bay.com/insurance/mpl/ "MPL Insurance: Coverage Highlights & Appetite") Heffernan covers the same ground in far fewer words, inside its general small-business coverage page:

Heffernan describes errors and omissions coverage as protecting against claims for problems with a company's product or service that result in a financial loss to a client. [10](https://www.heffins.com/business-insurance/small-business/ "Small Business Insurance") (Evidence: Company-reported; scope: Small Business Insurance page as read on 2026-09-23; the page does not list specific exclusions, claims-made versus occurrence form, or endorsements..)

Where At-Bay breaks MPL's features out one by one, Heffernan's single sentence is the whole of what its reviewed page says about the line. [3](https://www.at-bay.com/insurance/mpl/ "MPL Insurance: Coverage Highlights & Appetite")

### Who Each Business Serves

At-Bay's MPL page states eligibility for primary coverage for businesses of all revenue sizes, subject to state restrictions detailed in a separate appetite guide. [3](https://www.at-bay.com/insurance/mpl/ "MPL Insurance: Coverage Highlights & Appetite") Heffernan's small-business division says it serves sole proprietors through fast-growing companies across industries including construction, health care, hospitality, and technology, and will custom-design a package for industries not listed. [10](https://www.heffins.com/business-insurance/small-business/ "Small Business Insurance")

### How You Reach Each Company

At-Bay directs MPL submissions to underwriting by email or through its Broker Platform. [6](https://www.at-bay.com/brokers/platform/ "Broker Platform") Heffernan directs small-business buyers to contact its small-business division to request a quote, saying it will research and build a custom package for industries not already listed on its page. [10](https://www.heffins.com/business-insurance/small-business/ "Small Business Insurance")

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

- Ask Heffernan for the specific coverage terms and exclusions behind its one-sentence E&O description. [10](https://www.heffins.com/business-insurance/small-business/ "Small Business Insurance")
- Ask At-Bay for the insurer issuing your MPL policy, since the current page does not name one. [3](https://www.at-bay.com/insurance/mpl/ "MPL Insurance: Coverage Highlights & Appetite")
- Neither company publishes E&O limits on the reviewed pages; ask both for specific figures. [10](https://www.heffins.com/business-insurance/small-business/ "Small Business Insurance") [3](https://www.at-bay.com/insurance/mpl/ "MPL Insurance: Coverage Highlights & Appetite")
- Confirm whether Heffernan would custom-build your package or place a standard E&O form. [10](https://www.heffins.com/business-insurance/small-business/ "Small Business Insurance")
- Ask whether At-Bay's advertised $5 million ceiling and state restrictions apply to your business. [3](https://www.at-bay.com/insurance/mpl/ "MPL Insurance: Coverage Highlights & Appetite")

## Offering Details

| Criteria | At-Bay Miscellaneous Professional Liability (MPL) Insurance | Heffernan Professional Errors and Omissions Brokerage |
| --- | --- | --- |
| Role in This Line | At-Bay markets MPL as one of its own named insurance products, sold through its disclosed producer, At-Bay Insurance Services LLC, with the product page directed at "properly licensed insurance professionals" submitting business rather than at direct retail buyers. [3](https://www.at-bay.com/insurance/mpl/ "MPL Insurance: Coverage Highlights & Appetite") [4](https://www.at-bay.com/licenses/ "Licenses") (Evidence: Company-reported; scope: Current MPL product page and license disclosures; this describes the distribution channel, not who bears the underwriting risk..) | Heffernan lists errors and omissions among the coverages its small-business division places for clients, shopping the line with insurers rather than underwriting it. [10](https://www.heffins.com/business-insurance/small-business/ "Small Business Insurance") (Evidence: Company-reported; scope: Small Business Insurance page as read on 2026-09-23; no dedicated professional-E&O product page was found..) |
| Issuing Insurer | The current MPL product page does not name the insurer that issues the policy. A September 2023 press release named United Specialty Company in connection with MPL, but that historical reference does not establish the current issuing insurer for a new MPL quote. [3](https://www.at-bay.com/insurance/mpl/ "MPL Insurance: Coverage Highlights & Appetite") [5](https://www.at-bay.com/press_releases/at-bay-doubles-mpl/ "At-Bay Doubles Miscellaneous Professional Liability Appetite") (Evidence: Not found in reviewed sources; scope: Reviewed MPL page as of 2026-09-23 and the September 2023 press release; restates the existing provider fact that MPL's current issuer is unresolved, distinct from the August 2023 Cyber/Tech E&O transition to At-Bay Specialty Insurance Company paper..) | Not described in the reviewed sources. |
| Who It’s For | At-Bay says it provides primary MPL for businesses of all revenue sizes with limits up to $5 million, subject to state restrictions and eligibility requirements detailed in a separate MPL appetite guide. [3](https://www.at-bay.com/insurance/mpl/ "MPL Insurance: Coverage Highlights & Appetite") (Evidence: Company-reported; scope: Current MPL appetite paragraph; the linked appetite guide's specific eligibility requirements were not independently opened for this record..) | Heffernan's small-business division says it serves sole proprietors through fast-growing companies across industries including construction, food, health care, hospitality, nonprofits, real estate, technology, transportation, and vintners and growers, and will custom-design a package for industries not listed. [10](https://www.heffins.com/business-insurance/small-business/ "Small Business Insurance") (Evidence: Company-reported; scope: Small Business Insurance page as read on 2026-09-23; not exclusively E&O-specific, but describes the buyer base for the page listing this coverage..) |
| Coverage Features | At-Bay lists MPL coverage highlights including automatic coverage for acquired subsidiaries, claims-made-and-reported coverage, coverage for independent contractors, disciplinary-proceedings defense, a duty-to-defend contract, personal-injury coverage (including emotional distress), punitive damages where insurable, a professional-services definition written for each insured, and an 80/20 hammer clause. [3](https://www.at-bay.com/insurance/mpl/ "MPL Insurance: Coverage Highlights & Appetite") (Evidence: Company-reported; scope: Product-page coverage-highlights list; an 80/20 hammer clause is a settlement provision where the insurer pays 80% and the insured pays 20% of costs after the insured declines a recommended settlement. The issued policy and declarations control actual wording, limits and exclusions..) | Heffernan describes errors and omissions coverage as protecting against claims for problems with a company's product or service that result in a financial loss to a client. [10](https://www.heffins.com/business-insurance/small-business/ "Small Business Insurance") (Evidence: Company-reported; scope: Small Business Insurance page as read on 2026-09-23; the page does not list specific exclusions, claims-made versus occurrence form, or endorsements..) |
| Limits and Retentions | At-Bay publishes an MPL limit ceiling of up to $5 million, with state restrictions that are not detailed on the product page itself. [3](https://www.at-bay.com/insurance/mpl/ "MPL Insurance: Coverage Highlights & Appetite") (Evidence: Company-reported; scope: Current appetite paragraph; this is an advertised ceiling, not a guaranteed available limit for any specific applicant..) | The reviewed page does not publish limits, retentions, or premium ranges for errors and omissions coverage. [10](https://www.heffins.com/business-insurance/small-business/ "Small Business Insurance") (Evidence: Not publicly disclosed; scope: Small Business Insurance page as read on 2026-09-23..) |
| How to Apply | At-Bay directs MPL submissions to underwriting by email or through automatic quotes on its Broker Platform, which At-Bay describes as a workflow of creating a quote, customizing limits and retentions, and binding the policy. [3](https://www.at-bay.com/insurance/mpl/ "MPL Insurance: Coverage Highlights & Appetite") [6](https://www.at-bay.com/brokers/platform/ "Broker Platform") (Evidence: Company-reported; scope: Current submission instructions and the general broker-platform workflow description; MPL-specific automation details were not separately confirmed..) | Heffernan directs small-business buyers to contact the firm's small-business division to request a quote and says it will research and build a custom package for industries not already listed. [10](https://www.heffins.com/business-insurance/small-business/ "Small Business Insurance") (Evidence: Company-reported; scope: Small Business Insurance page as read on 2026-09-23..) |

## Full Comparison

- [At-Bay vs Heffernan Insurance Brokers](https://spot.insure/compare/at-bay-vs-heffernan): 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 E&O insurance addresses claims that a mistake in your advice or services caused a client financial loss.
- [At-Bay vs Heffernan Insurance Brokers Cyber Insurance](https://spot.insure/compare/at-bay-vs-heffernan/cyber)
- [Alliance Risk vs At-Bay Professional Liability (E&O) Insurance](https://spot.insure/compare/alliance-risk-vs-at-bay/professional-errors-omissions)
- [Alliance Risk vs Heffernan Insurance Brokers Professional Liability (E&O) Insurance](https://spot.insure/compare/alliance-risk-vs-heffernan/professional-errors-omissions)
- [At-Bay vs Beazley Professional Liability (E&O) Insurance](https://spot.insure/compare/at-bay-vs-beazley/professional-errors-omissions)
- [At-Bay vs CFC Professional Liability (E&O) Insurance](https://spot.insure/compare/at-bay-vs-cfc/professional-errors-omissions)
- [At-Bay vs Chubb Professional Liability (E&O) Insurance](https://spot.insure/compare/at-bay-vs-chubb/professional-errors-omissions)
- [At-Bay vs Coalition Professional Liability (E&O) Insurance](https://spot.insure/compare/at-bay-vs-coalition/professional-errors-omissions)

## Sources

### At-Bay

1. [Cyber, Tech E&O & Professional Liability Insurance](https://www.at-bay.com/insurance/). At-Bay; Product cards and agency disclosure. Accessed 2026-09-16.
2. [At-Bay Stance](https://www.at-bay.com/stance/). At-Bay; Real Protection Against Real Threats; Endpoint, Email, MXDR; footnotes 1 and 3–6. Accessed 2026-09-16.
3. [MPL Insurance: Coverage Highlights & Appetite](https://www.at-bay.com/insurance/mpl/). At-Bay; MPL Coverage Highlights list; MPL Appetite paragraph; Send us your submissions; "material on this page is intended for use solely by properly licensed insurance professionals". Accessed 2026-09-23.
4. [Licenses](https://www.at-bay.com/licenses/). At-Bay; Producer introduction; agency and surplus-lines footer naming At-Bay Insurance Services LLC. Accessed 2026-09-16.
5. [At-Bay Doubles Miscellaneous Professional Liability Appetite](https://www.at-bay.com/press_releases/at-bay-doubles-mpl/). At-Bay; September 28, 2023 release: final paragraph before Media Contacts. Accessed 2026-09-16.
6. [Broker Platform](https://www.at-bay.com/brokers/platform/). At-Bay; How it works: Create a quote, Customize your quote, Bind your policy, Manage renewals; FAQs. Accessed 2026-09-16.

### Heffernan Insurance Brokers

7. [Our Story](https://www.heffins.com/about-us/our-story/). Heffernan Insurance Brokers; Headquartered in Walnut Creek; nationwide presence; founded 1988; employee owned; niche practices including technology. Accessed 2026-09-16.
8. [Technology Company Insurance](https://www.heffins.com/business-insurance/technology/). Heffernan Insurance Brokers; Pre-IPO and venture-funded heading; mid to late stage specialization; global expansion copy; self-insurance strategies; Key Markets list; Why Heffernan broker history; Joseph Talmadge practice leader; FAQ. Accessed 2026-09-16.
9. [Heffernan Business Insurance Brokerage](https://www.heffins.com/business-insurance/). Heffernan Insurance Brokers; Forward-Thinking Business Insurance: basic coverages (general liability, commercial property and auto, workers’ compensation); corporate and executive protection (EPL, D&O, fiduciary responsibility, cyber, kidnap and ransom); alternative risk capabilities; claims, loss control and risk-management services; industry practice links including Technology and Claims Advocacy. Accessed 2026-09-16.
10. [Small Business Insurance](https://www.heffins.com/business-insurance/small-business/). Heffernan Insurance Brokers; The types of coverage we can provide include... Errors and omissions protects against claims for problems with your product or service that result in a financial loss; industries served list; Specialty Programs; contact for custom-designed packages. 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 2026-09-23. 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.

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