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.

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. ^1,²

Read the At-Bay profile

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,^8,⁹

Read the Heffernan Insurance Brokers 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. ^11,^12,^13,¹⁴

Read the full coverage guide

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 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. ¹⁰Company-reported. 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

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 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

How You Reach Each Company

At-Bay directs MPL submissions to underwriting by email or through its Broker Platform. ⁶ 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

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
Ask At-Bay for the insurer issuing your MPL policy, since the current page does not name one. ³
Neither company publishes E&O limits on the reviewed pages; ask both for specific figures. ¹⁰ ³
Confirm whether Heffernan would custom-build your package or place a standard E&O form. ¹⁰
Ask whether At-Bay's advertised $5 million ceiling and state restrictions apply to your business. ³

Offering Details

At-Bay vs Heffernan Insurance Brokers Professional Liability (E&O) Insurance: documented features by provider

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. ^3,⁴Company-reported. 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. ¹⁰Company-reported. 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. ^3,⁵Not found in reviewed sources. 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. ³Company-reported. 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. ¹⁰Company-reported. 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. ³Company-reported. 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. ¹⁰Company-reported. 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. ³Company-reported. 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. ¹⁰Not publicly disclosed. 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. ^3,⁶Company-reported. 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. ¹⁰Company-reported. Small Business Insurance page as read on 2026-09-23.

Full Comparison

More At-Bay vs Heffernan Insurance Brokers Comparisons

Cyber Insurance

Other Professional Liability (E&O) Insurance Comparisons

Sources

At-Bay

Cyber, Tech E&O & Professional Liability Insurance. At-Bay; Product cards and agency disclosure. Accessed 2026-09-16.
At-Bay Stance. At-Bay; Real Protection Against Real Threats; Endpoint, Email, MXDR; footnotes 1 and 3–6. Accessed 2026-09-16.
MPL Insurance: Coverage Highlights & Appetite. 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.
Licenses. At-Bay; Producer introduction; agency and surplus-lines footer naming At-Bay Insurance Services LLC. Accessed 2026-09-16.
At-Bay Doubles Miscellaneous Professional Liability Appetite. At-Bay; September 28, 2023 release: final paragraph before Media Contacts. Accessed 2026-09-16.
Broker 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

Our Story. Heffernan Insurance Brokers; Headquartered in Walnut Creek; nationwide presence; founded 1988; employee owned; niche practices including technology. Accessed 2026-09-16.
Technology Company Insurance. 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.
Heffernan Business Insurance Brokerage. 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.
Small Business Insurance. 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

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.