---
title: "At-Bay vs Marsh McLennan Agency: Cyber Insurance"
description: "At-Bay specifies interruption, fraud and security-tier features with published limits; Marsh McLennan Agency describes cyber placement without naming terms or limits."
canonical: "https://spot.insure/compare/at-bay-vs-marsh-mclennan-agency/cyber"
page-type: "line-comparison"
updated-at: "2026-09-30"
comparison-pair: "at-bay-vs-marsh-mclennan-agency"
provider-a: "at-bay"
provider-b: "marsh-mclennan-agency"
coverage-line: "cyber"
---

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[Human-readable page](https://spot.insure/compare/at-bay-vs-marsh-mclennan-agency/cyber)

## Agent Guide

**What this page is:** Focused comparison of At-Bay and Marsh McLennan Agency for Cyber 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 Cyber Insurance questions about At-Bay versus Marsh McLennan Agency. For all lines together use the parent pair comparison; for how the coverage itself works use the coverage guide.

**Questions this page answers:**
- At-Bay vs Marsh McLennan Agency for Cyber Insurance: how do they differ?
- Which is better for Cyber Insurance, At-Bay or Marsh McLennan Agency?
- What does At-Bay or Marsh McLennan Agency publish about Cyber Insurance (limits, eligibility, claims, add-ons)?
- What should I confirm in a quote for Cyber Insurance from At-Bay or Marsh McLennan Agency?

**Key facts:**
- Line: Cyber Insurance. Providers: At-Bay and Marsh McLennan Agency.
- 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:**
- [At-Bay vs Marsh McLennan Agency](https://spot.insure/compare/at-bay-vs-marsh-mclennan-agency) — parent: all coverage lines for this pair
- [Cyber Insurance guide](https://spot.insure/coverage/cyber) — coverage explainer for this line
- [At-Bay profile](https://spot.insure/insurance-providers/at-bay) — provider profile (evidence)
- [Marsh McLennan Agency profile](https://spot.insure/insurance-providers/marsh-mclennan-agency) — provider profile (evidence)
- [AIG vs At-Bay Cyber Insurance](https://spot.insure/compare/aig-vs-at-bay/cyber) — sibling comparison (other line, or other pair for this line)
- [AIG vs Marsh McLennan Agency Cyber Insurance](https://spot.insure/compare/aig-vs-marsh-mclennan-agency/cyber) — sibling comparison (other line, or other pair for this line)
- [Alliance Risk vs At-Bay Cyber Insurance](https://spot.insure/compare/alliance-risk-vs-at-bay/cyber) — sibling comparison (other line, or other pair for this line)
- [Alliance Risk vs Marsh McLennan Agency Cyber Insurance](https://spot.insure/compare/alliance-risk-vs-marsh-mclennan-agency/cyber) — sibling comparison (other line, or other pair for this line)
- [Amelia Risk vs At-Bay Cyber Insurance](https://spot.insure/compare/amelia-risk-vs-at-bay/cyber) — sibling comparison (other line, or other pair for this line)
- [Amelia Risk vs Marsh McLennan Agency Cyber Insurance](https://spot.insure/compare/amelia-risk-vs-marsh-mclennan-agency/cyber) — sibling comparison (other line, or other pair for this line)

# At-Bay vs Marsh McLennan Agency: How Do They Compare for Cyber Insurance?

At-Bay specifies interruption, fraud and security-tier features with published limits; Marsh McLennan Agency describes cyber placement without naming terms or limits.

## Research Scope and Use

Use this comparison to evaluate At-Bay and Marsh McLennan Agency for Cyber 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 specifies interruption, fraud and security-tier features with published limits; Marsh McLennan Agency describes cyber placement without naming terms or limits. [3](https://www.at-bay.com/insurance/cyber/ "Cyber Insurance Coverage & Policy Highlights") [9](https://www.marshmma.com/us/solutions/cyber.html "Cyber | MMA")

## What Is At-Bay Insurance?

At-Bay targets technology firms with up to $5 billion in revenue and offers cyber limits up to $10 million, plus technology E&O; buyers seeking a standard online business package should compare other carriers. Managed detection and response costs extra. [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 Marsh McLennan Agency?

Marsh McLennan Agency provides business insurance and employee health and benefits, alongside retirement, wealth, and private-client services across the United States and Canada. Its US small-business page lists six common coverage types and directs buyers to request a personalized quote by phone; the insurer and terms for a specific placement must be confirmed in the proposal. [7](https://www.marshmma.com/us/mma/about-us.html "Who We Are") [8](https://www.marshmma.com/us/solutions/small-business.html "Small Business Insurance Solutions")

[Marsh McLennan Agency profile](https://spot.insure/insurance-providers/marsh-mclennan-agency)

## What Is Cyber Insurance?

Cyber insurance can help pay covered response costs and claims against your business after a cyber incident. If your business relies on data, software or outside providers, compare response limits, vendor outages and approval rules. [10](https://www.ftc.gov/business-guidance/small-businesses/cybersecurity/cyber-insurance "Cyber Insurance") [11](https://www.aig.com/content/dam/aig/america-canada/us/documents/business/cyber/cyberedge-wording-sample-specimen-form.pdf "CyberEdge specimen policy")

## Key Differences in Cyber Insurance

### Coverage and Limits

At-Bay lists direct and contingent business interruption, system failure, invoice manipulation and social engineering, plus cryptojacking and bricking cover. Marsh McLennan Agency describes cyber liability and risk management without listing comparable grants. A business reliant on cloud vendors should ask Marsh McLennan Agency whether its proposal includes contingent interruption and what waiting period applies. [3](https://www.at-bay.com/insurance/cyber/ "Cyber Insurance Coverage & Policy Highlights") [9](https://www.marshmma.com/us/solutions/cyber.html "Cyber | MMA")

### Security Services and Eligibility

Every At-Bay policy includes Stance security tools and breach-coach access, while higher InsurSec tiers add a reduced ransomware retention or financial-fraud terms and require a separate managed-detection subscription. Marsh McLennan Agency’s overview does not list similar services. At-Bay writes up to $10 million and $5 billion revenue, while its automated route has lower thresholds. Ask Marsh McLennan Agency for its limits and included tools. [3](https://www.at-bay.com/insurance/cyber/ "Cyber Insurance Coverage & Policy Highlights") [9](https://www.marshmma.com/us/solutions/cyber.html "Cyber | MMA")

### Buying and Incident Support

At-Bay accepts emailed underwriting submissions or broker-platform requests and describes an in-house claims team. Marsh McLennan Agency asks buyers to contact an adviser. The current At-Bay page does not name an issuer per quote, so confirm the insurer and whether any security subscription is required for your selected tier. [3](https://www.at-bay.com/insurance/cyber/ "Cyber Insurance Coverage & Policy Highlights") [9](https://www.marshmma.com/us/solutions/cyber.html "Cyber | MMA")

## What to Confirm in Cyber Insurance Quotes

- Which At-Bay InsurSec tier and separate MDR subscription apply, and what financial-fraud or ransomware retention is quoted? Ask Marsh McLennan Agency for limits, contingent interruption wording, incident services and its claims contact. [3](https://www.at-bay.com/insurance/cyber/ "Cyber Insurance Coverage & Policy Highlights") [9](https://www.marshmma.com/us/solutions/cyber.html "Cyber | MMA")

## Offering Details

| Criteria | At-Bay Cyber Insurance | Marsh McLennan Agency cyber (official overview) |
| --- | --- | --- |
| Role in This Line | At-Bay places cyber insurance through its disclosed producer, At-Bay Insurance Services LLC, which is licensed as an insurance producer in all 50 states. At-Bay says eligible new excess-and-surplus (E&S) cyber business has been written on its own carrier paper, At-Bay Specialty Insurance Company, since August 2023. [4](https://www.at-bay.com/licenses/ "Licenses") [5](https://www.at-bay.com/press_releases/at-bay-begins-issuing-policies-on-its-own-paper/ "At-Bay Begins Issuing Policies on its own E&S Paper") (Evidence: Company-reported; scope: Producer role from the current license page; carrier role from a 2023 transition announcement, not confirmed for every current cyber quote..) | Marsh McLennan Agency describes arranging cyber for the audience stated on the cited product page. [9](https://www.marshmma.com/us/solutions/cyber.html "Cyber | MMA") (Evidence: Company-reported; scope: cyber marketed by marsh-mclennan-agency; scope is limited to the cited official product overview and described audience. This is not a policy form or a universal eligibility statement..) |
| Issuing Insurer | The current cyber product page does not name an issuing insurer. At-Bay's 2023 announcement says new E&S cyber business is quoted on At-Bay Specialty Insurance Company paper, but that is a historical statement, not a per-quote disclosure. [3](https://www.at-bay.com/insurance/cyber/ "Cyber Insurance Coverage & Policy Highlights") [5](https://www.at-bay.com/press_releases/at-bay-begins-issuing-policies-on-its-own-paper/ "At-Bay Begins Issuing Policies on its own E&S Paper") (Evidence: Company-reported; scope: Cyber product page checked today names no insurer; the carrier-transition release is dated August 2023 and does not cover every current state or account..) | Confirm in your quote. |
| Who It’s For | Confirm in your quote. | Organizations managing cyber exposure; exact insurer, policy form, and eligibility are placement-specific. [9](https://www.marshmma.com/us/solutions/cyber.html "Cyber | MMA") (Evidence: Company-reported; scope: cyber marketed by marsh-mclennan-agency; scope is limited to the cited official product overview and described audience. This is not a policy form or a universal eligibility statement..) |
| Coverage Features | At-Bay lists direct and contingent business interruption and system failure coverage, social engineering and invoice manipulation coverage for all classes of business, full limits for cryptojacking and bricking, broad cyber extortion coverage including cryptocurrency payment, and reputational-harm coverage for PR costs from adverse publicity. [3](https://www.at-bay.com/insurance/cyber/ "Cyber Insurance Coverage & Policy Highlights") (Evidence: Company-reported; scope: Product-page coverage highlights; the issued policy and endorsements control actual terms..)<br><br>At-Bay sells cyber insurance with optional InsurSec security tiers: Core includes vulnerability monitoring and a fraud-defense sub-limit; Advanced adds a reduced ransomware retention and a zero-hour ransomware waiting period; Complete adds a $0 financial-fraud retention and a $1 million financial-fraud sub-limit. Each higher tier requires a separately purchased managed detection and response (MDR) subscription. [3](https://www.at-bay.com/insurance/cyber/ "Cyber Insurance Coverage & Policy Highlights") (Evidence: Company-reported; scope: Product-page InsurSec package descriptions and footnotes; availability depends on the business's risk profile and qualifying conditions..) | The cited product page describes cyber liability and a cyber-risk management strategy as part of the executive and professional risk offering. Marketing description only; actual coverage, exclusions, conditions, limits, and availability depend on the issued policy and jurisdiction. [9](https://www.marshmma.com/us/solutions/cyber.html "Cyber | MMA") (Evidence: Company-reported; scope: cyber marketed by marsh-mclennan-agency; scope is limited to the cited official product overview and described audience. This is not a policy form or a universal eligibility statement..) |
| Limits and Retentions | At-Bay says it writes primary and excess cyber insurance for businesses with revenue up to $5 billion and limits up to $10 million. Through its Broker Platform, brokers can get automated quotes only for businesses up to $100 million in revenue and $3 million in limits. [3](https://www.at-bay.com/insurance/cyber/ "Cyber Insurance Coverage & Policy Highlights") (Evidence: Company-reported; scope: Published appetite ceilings, not guaranteed offers; underwriting and the appetite guide control individual accounts..) | The cited overview does not set a universal limit or retention for this line. Ask for the proposed policy form, limits, retentions, exclusions, and conditions in the quote. [9](https://www.marshmma.com/us/solutions/cyber.html "Cyber | MMA") (Evidence: Not publicly disclosed; scope: Only the cited marketing page was reviewed for published limit and retention information; no policy-form entitlement is inferred..) |
| Risk Services | Every At-Bay cyber policy includes access to At-Bay Stance, a security platform with vulnerability monitoring, vCISO advisory and tabletop exercises, and security awareness training. Managed detection and response (MDR) for endpoints or email costs extra, $16 or $25 per user per month respectively, and is sold separately by At-Bay Security, LLC. [3](https://www.at-bay.com/insurance/cyber/ "Cyber Insurance Coverage & Policy Highlights") (Evidence: Company-reported; scope: Product-page InsurSec and footnote descriptions; MDR pricing is described as estimated and subject to change..) | Confirm in your quote. |
| How to Apply | You apply for At-Bay cyber coverage by emailing a submission to underwriting@at-bay.com or by requesting an automated quote through At-Bay's Broker Platform. [3](https://www.at-bay.com/insurance/cyber/ "Cyber Insurance Coverage & Policy Highlights") (Evidence: Company-reported; scope: Product-page submission instructions; the Broker Platform route is limited to accounts within its lower appetite ceilings..) | The page invites organizations to contact a Marsh McLennan Agency adviser or specialist to discuss placement. The page does not establish a quote, bind, or coverage-effective timeline. [9](https://www.marshmma.com/us/solutions/cyber.html "Cyber | MMA") (Evidence: Company-reported; scope: cyber marketed by marsh-mclennan-agency; scope is limited to the cited official product overview and described audience. This is not a policy form or a universal eligibility statement..) |
| Claims Support | At-Bay describes an in-house claims team and a named breach-coach phone line for active ransomware or system-interruption incidents, alongside a published cyber incident roadmap that assembles response partners after a claim is reported. [6](https://www.at-bay.com/claims/ "Claims Handling") (Evidence: Company-reported; scope: Claims-handling page process description; does not establish claim outcomes or payment speed..) | Confirm in your quote. |

## Full Comparison

- [At-Bay vs Marsh McLennan Agency](https://spot.insure/compare/at-bay-vs-marsh-mclennan-agency): all coverage lines, business roles, service and claims.
- [What Is Cyber Insurance?](https://spot.insure/coverage/cyber): Cyber insurance can help pay covered breach response, data recovery, interruption and liability costs; vendor incidents and funds-transfer fraud need separate checks.
- [AIG vs At-Bay Cyber Insurance](https://spot.insure/compare/aig-vs-at-bay/cyber)
- [AIG vs Marsh McLennan Agency Cyber Insurance](https://spot.insure/compare/aig-vs-marsh-mclennan-agency/cyber)
- [Alliance Risk vs At-Bay Cyber Insurance](https://spot.insure/compare/alliance-risk-vs-at-bay/cyber)
- [Alliance Risk vs Marsh McLennan Agency Cyber Insurance](https://spot.insure/compare/alliance-risk-vs-marsh-mclennan-agency/cyber)
- [Amelia Risk vs At-Bay Cyber Insurance](https://spot.insure/compare/amelia-risk-vs-at-bay/cyber)
- [Amelia Risk vs Marsh McLennan Agency Cyber Insurance](https://spot.insure/compare/amelia-risk-vs-marsh-mclennan-agency/cyber)

## 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. [Cyber Insurance Coverage & Policy Highlights](https://www.at-bay.com/insurance/cyber/). At-Bay; Cyber Coverage Highlights; Primary & Excess Appetite; InsurSec Packages (Core, Advanced, Complete); footnotes 1–7. Accessed 2026-09-23.
4. [Licenses](https://www.at-bay.com/licenses/). At-Bay; At-Bay Insurance Services LLC producer introduction and 50-state P&C/surplus-lines license table. Accessed 2026-09-23.
5. [At-Bay Begins Issuing Policies on its own E&S Paper](https://www.at-bay.com/press_releases/at-bay-begins-issuing-policies-on-its-own-paper/). At-Bay; August 9, 2023 release: "At-Bay ... has begun issuing Cyber and Tech E&O policies under its Delaware-based Excess and Surplus (E&S) carrier, At-Bay Specialty Insurance Company"; "All E&S Cyber and Tech E&O new business in eligible states and territories is now being quoted on At-Bay Specialty Insurance Company paper, as of August 7, 2023". Accessed 2026-09-23.
6. [Claims Handling](https://www.at-bay.com/claims/). At-Bay; At-Bay Cyber Incident Roadmap; Call an At-Bay Breach Coach; The At-Bay Claims Team. Accessed 2026-09-23.

### Marsh McLennan Agency

7. [Who We Are](https://www.marshmma.com/us/mma/about-us.html). Marsh McLennan Agency; Lines 193-195: ‘a business of Marsh’ and company-listed service lines across US and Canada. This does not establish the legal entity for an account, corporate ownership chart, or insurer role.. Accessed 2026-09-29.
8. [Small Business Insurance Solutions](https://www.marshmma.com/us/solutions/small-business.html). Marsh McLennan Agency; Lines 205-207: small-business audience and call invitation; lines 224-249 list six coverage categories and short descriptions; line 264 is an embedded form whose function is not stated. No form submitted.. Accessed 2026-09-29.
9. [Cyber | MMA](https://www.marshmma.com/us/solutions/cyber.html). Marsh McLennan Agency; Cyber solution overview and cyber-risk services.. Accessed 2026-09-30.

### Cyber Insurance Guide

10. [Cyber Insurance](https://www.ftc.gov/business-guidance/small-businesses/cybersecurity/cyber-insurance). Federal Trade Commission; Opening; First-Party and Third-Party Coverage; First-Party Coverage; Third-Party Coverage; What Should Your Cyber Insurance Policy Cover. Accessed 2026-09-16.
11. [CyberEdge specimen policy](https://www.aig.com/content/dam/aig/america-canada/us/documents/business/cyber/cyberedge-wording-sample-specimen-form.pdf). AIG; General Terms §§4–6, PDF pp.3–6; Security and Privacy §1 p.11, §2(l)/(p) p.14, §3 pp.15–18, exclusions p.18; Event Management §1 and §2(h), PDF pp.19–20. 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.

## At-Bay Reviews

Review Score: 9.5 / 10 from 2 rated sources, equally weighted.

At-Bay’s public review evidence is thin: one old G2 review and a BBB complaint record. It is not enough to judge day-to-day service or claims handling.

- BBB: BBB rating A (A+ to F). At-Bay identity; US commercial insurance review/satisfaction evidence sought on BBB. Period: accessed 2026-09-25. Checked 2026-09-25. [At-Bay | BBB Business Profile](https://www.bbb.org/us/ca/mountain-view/profile/insurance-companies/at-bay-1216-1000025767)
- G2: G2 star rating 4.5 (5 stars); 1 reviews. At-Bay company/product feedback; G2 seller profile identifies its offering as cybersecurity insurance and lists San Francisco headquarters. Not an insurance-policy claims or commercial-buyer satisfaction study. Period: review dated 2020-09-21. Checked 2026-09-25. [At-Bay seller profile and reviews](https://www.g2.com/es/sellers/at-bay)

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

## Marsh McLennan Agency Reviews

Review Score: 8.2 / 10 from 2 rated sources, equally weighted.

There are almost no public customer reviews of Marsh McLennan Agency (MMA). Trustpilot shows 3.2 out of 5, but from a single review, and BBB shows an A grade with four complaints closed in three years.

- Trustpilot: TrustScore 3.2 (out of 5); 1 reviews. Trustpilot profile for marshmma.com, MMA's own domain. Unclaimed; MMA has not invited reviews. Period: checked 2026-09-29. Checked 2026-09-29. [marshmma.com Trustpilot profile](https://www.trustpilot.com/review/marshmma.com)
- Trustpilot: TrustScore (Marsh brand) 1.3 (out of 5); 115 reviews. Trustpilot page for marsh.com, the global Marsh brand (mostly individual and non-US customers). This is a different entity from MMA. Period: checked 2026-09-29. Checked 2026-09-29. [Marsh Reviews](https://www.trustpilot.com/review/www.marsh.com)
- BBB: BBB business grade A. BBB San Diego-area profile for Marsh & McLennan Agency LLC (accredited). MMA has separate BBB profiles per office; Dayton and Schaumburg both show A+. Checked 2026-09-29. [Marsh & McLennan Agency LLC (San Diego) BBB](https://www.bbb.org/us/ca/san-diego/profile/insurance-services-office/marsh-mclennan-agency-llc-1126-3000103)
- BBB: Complaints 4. Same San Diego-area profile; zero customer reviews. No client-count denominator. Period: closed in the last three years (checked 2026-09-29). Checked 2026-09-29. [Marsh & McLennan Agency LLC — BBB Complaints](https://www.bbb.org/us/ca/san-diego/profile/insurance-services-office/marsh-mclennan-agency-llc-1126-3000103/complaints); [Marsh & McLennan Agency LLC — BBB Reviews](https://www.bbb.org/us/ca/san-diego/profile/insurance-services-office/marsh-mclennan-agency-llc-1126-3000103/customer-reviews)

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

## Agent and Developer Resources

- [Markdown page](https://spot.insure/compare/at-bay-vs-marsh-mclennan-agency/cyber.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)