---
title: "At-Bay vs Harper Professional Liability (E&O) Insurance"
description: "Harper markets the same policy under two catalog names; At-Bay's MPL is one distinctly named product with published coverage highlights."
canonical: "https://spot.insure/compare/at-bay-vs-harper/professional-errors-omissions"
page-type: "line-comparison"
updated-at: "2026-09-23"
---

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

Harper markets the same policy under two catalog names; At-Bay's MPL is one distinctly named product with published coverage highlights.

## Research Scope and Use

Use this comparison to evaluate At-Bay and Harper 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

Harper lists the identical policy under two catalog entries, Professional Liability and Errors and Omissions, saying it is the same coverage named differently by industry. At-Bay markets Miscellaneous Professional Liability as a single, distinctly named product with its own listed coverage features. [10](https://www.harperinsure.com/coverages/errors-and-omissions "Errors and Omissions Insurance") [11](https://www.harperinsure.com/coverages "What We Cover") [3](https://www.at-bay.com/insurance/mpl/ "MPL Insurance: Coverage Highlights & Appetite")

## 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 Harper Insurance?

Harper is a commercial insurance brokerage for businesses with complex risks. Its specialists use AI tools to gather information, seek quotes from insurers and help customers manage coverage. [7](https://www.harperinsure.com/sms-terms "Text Messaging Terms and Conditions") [8](https://www.harperinsure.com/insurance-insights/harper-45m-funding-announcement "We're Announcing $47M to Build the Insurance Company Every Business Deserves")

[Harper profile](https://spot.insure/insurance-providers/harper)

## 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. [12](https://www.tdi.texas.gov/commercial/pl-faq.html "FAQ: Professional liability insurance") [13](https://www.iii.org/article/professional-liability-insurance "Professional liability insurance") [14](https://www.sba.gov/counseling/launch-your-business/#business-insurance "Get business insurance") [15](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

### One Product, Two Names Versus One Named Product

At-Bay names Miscellaneous Professional Liability (MPL) as a single product with its own dedicated page and coverage-highlights list, including a duty-to-defend contract and an 80/20 hammer clause. [3](https://www.at-bay.com/insurance/mpl/ "MPL Insurance: Coverage Highlights & Appetite") Harper's catalog structure looks different:

Harper markets the identical policy under two catalogue entries, "Professional Liability" and "Errors and Omissions"; the E&O page states it is the same policy, just named what a given industry calls it. [10](https://www.harperinsure.com/coverages/errors-and-omissions "Errors and Omissions Insurance") [11](https://www.harperinsure.com/coverages "What We Cover") (Evidence: Company-reported; scope: Coverage directory listing plus the E&O page's own description; a naming convention Harper states about itself, not a distinction between two products..)

Where At-Bay's catalog has one MPL entry, a buyer searching Harper's site for either professional liability or E&O lands on the same product. [3](https://www.at-bay.com/insurance/mpl/ "MPL Insurance: Coverage Highlights & Appetite")

### How Each Company Describes Its Role in Placing the Policy

Harper describes reading a policy's exclusions line by line before a client buys, framing this as a differentiator since two E&O policies with the same limit can respond differently to the same claim. [9](https://www.harperinsure.com/coverages/professional-liability "Professional Liability Insurance") At-Bay routes MPL submissions through its own disclosed producer, At-Bay Insurance Services LLC, rather than describing a policy-review service performed for the end client. [3](https://www.at-bay.com/insurance/mpl/ "MPL Insurance: Coverage Highlights & Appetite") [4](https://www.at-bay.com/licenses/ "Licenses")

### What Neither Page Discloses

Harper's reviewed pages name pricing drivers like services performed and contract size but do not name the issuing insurer or publish limit figures for professional liability or E&O. [9](https://www.harperinsure.com/coverages/professional-liability "Professional Liability Insurance") At-Bay's current MPL page also does not name the insurer that would issue a new policy. [3](https://www.at-bay.com/insurance/mpl/ "MPL Insurance: Coverage Highlights & Appetite")

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

- Ask Harper whether a specific client-contract requirement changes which of its two catalog entries applies to you. [10](https://www.harperinsure.com/coverages/errors-and-omissions "Errors and Omissions Insurance")
- Neither company names the issuing insurer on the reviewed pages; ask both directly. [9](https://www.harperinsure.com/coverages/professional-liability "Professional Liability Insurance") [3](https://www.at-bay.com/insurance/mpl/ "MPL Insurance: Coverage Highlights & Appetite")
- Ask At-Bay for its published $5 million limit ceiling and any state restrictions on your business. [3](https://www.at-bay.com/insurance/mpl/ "MPL Insurance: Coverage Highlights & Appetite")
- Ask Harper for the specific limit and premium your contract's E&O requirement calls for. [9](https://www.harperinsure.com/coverages/professional-liability "Professional Liability Insurance")
- Confirm whether At-Bay requires a licensed broker to submit MPL business on your behalf. [3](https://www.at-bay.com/insurance/mpl/ "MPL Insurance: Coverage Highlights & Appetite")

## Offering Details

| Criteria | At-Bay Miscellaneous Professional Liability (MPL) Insurance | Harper Professional Liability Insurance |
| --- | --- | --- |
| 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..) | Harper places professional liability coverage as a broker, writing the policy around the applicant's actual services rather than underwriting it, and describes a specialist handling the placement. [9](https://www.harperinsure.com/coverages/professional-liability "Professional Liability Insurance") (Evidence: Company-reported; scope: Professional liability page introduction and 'Why Harper' section..)<br><br>Harper markets the identical policy under two catalogue entries, "Professional Liability" and "Errors and Omissions"; the E&O page states it is the same policy, just named what a given industry calls it. [10](https://www.harperinsure.com/coverages/errors-and-omissions "Errors and Omissions Insurance") [11](https://www.harperinsure.com/coverages "What We Cover") (Evidence: Company-reported; scope: Coverage directory listing plus the E&O page's own description; a naming convention Harper states about itself, not a distinction between two products..) |
| 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..) | The reviewed pages name pricing drivers (services performed, revenue, contract size) but do not name the issuing insurer or publish specific limit, retention or premium figures for this line. [9](https://www.harperinsure.com/coverages/professional-liability "Professional Liability Insurance") [10](https://www.harperinsure.com/coverages/errors-and-omissions "Errors and Omissions Insurance") (Evidence: Not publicly disclosed; scope: Checked both the professional-liability and errors-and-omissions pages on 2026-09-23; neither names a carrier or a limit figure..) |
| 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..) | Harper targets consultants, agencies, tech firms and licensed professionals whose work product is advice, design or a decision, since general liability doesn't cover a client claiming that work caused a financial loss. [9](https://www.harperinsure.com/coverages/professional-liability "Professional Liability Insurance") (Evidence: Company-reported; scope: Professional liability page introduction and FAQ distinguishing it from general liability..) |
| 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..) | Harper describes coverage for errors and omissions in the work itself, negligence allegations about professional judgment, and legal defense costs, with limits it says are matched to the client contracts that require the policy. [9](https://www.harperinsure.com/coverages/professional-liability "Professional Liability Insurance") [10](https://www.harperinsure.com/coverages/errors-and-omissions "Errors and Omissions Insurance") (Evidence: Company-reported; scope: Professional liability page's four coverage tiles; the E&O page adds that claims often surface a year or more after the work was delivered. The issued policy and its exclusions control actual scope..) |
| 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..) | Not described in the reviewed sources. |
| Risk Services | Not described in the reviewed sources. | Harper says it reads a policy's exclusions line by line before a client buys, because two E&O policies with the same limit can respond very differently to the same claim. [9](https://www.harperinsure.com/coverages/professional-liability "Professional Liability Insurance") (Evidence: Company-reported; scope: Professional liability page 'We know this' section; a described review practice, not an independently verified outcome..) |
| 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..) | You request a quote online or by phone; if a client contract requires E&O, Harper says it places coverage matching that requirement and issues the certificate the same day. [9](https://www.harperinsure.com/coverages/professional-liability "Professional Liability Insurance") (Evidence: Company-reported; scope: Professional liability page quote form and FAQ 'My client contract requires E&O. What now?'..) |

## Full Comparison

- [At-Bay vs Harper](https://spot.insure/compare/at-bay-vs-harper): 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 Harper Cyber Insurance](https://spot.insure/compare/at-bay-vs-harper/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 Harper Professional Liability (E&O) Insurance](https://spot.insure/compare/alliance-risk-vs-harper/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.

### Harper

7. [Text Messaging Terms and Conditions](https://www.harperinsure.com/sms-terms). Harper Global Enterprises Inc.; Effective August 24, 2026; sections 1–3 (entity, consent and service messages), 5 (message costs), 9 (delivery) and 11 (coverage confirmation). Accessed 2026-09-15.
8. [We're Announcing $47M to Build the Insurance Company Every Business Deserves](https://www.harperinsure.com/insurance-insights/harper-45m-funding-announcement). Harper / Dakotah Rice; February 26, 2026 article: brokerage identity; AI-assisted submissions and follow-ups; 24–48-hour coverage statement; more than 165 underwriters; plans for additional direct appointments. Accessed 2026-09-15.
9. [Professional Liability Insurance](https://www.harperinsure.com/coverages/professional-liability). Harper; Know your coverage: What is Professional Liability insurance?; Errors & omissions, Negligence allegations, Legal defense, Contract-driven limits; Why Harper; FAQs on general liability vs. E&O, client E&O requirements, and pricing drivers. Accessed 2026-09-23.
10. [Errors and Omissions Insurance](https://www.harperinsure.com/coverages/errors-and-omissions). Harper; Page states the product is 'Same policy as professional liability, just what your industry calls it'; describes financial-loss claims from professional services and late-arriving claims. Accessed 2026-09-23.
11. [What We Cover](https://www.harperinsure.com/coverages). Harper; Coverage directory list including Errors and Omissions and Professional Liability as separate catalogue entries. Accessed 2026-09-23.

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

12. [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.
13. [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.
14. [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.
15. [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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