Trilateral Research vs EY: full comparison for 2026
Quick verdict
Trilateral Research (4.3/5) edges ahead of EY (4.2/5) overall. Trilateral Research is the better choice for public bodies needing rights and ethics assessments. EY is the stronger option for enterprises building AI risk into existing controls. The right choice depends on how independent you need the advice to be, your regulatory exposure, and your budget.
Trilateral Research vs EY: head-to-head summary
| Criterion | Trilateral Research | EY |
|---|---|---|
| Founded | 2004 | 1989 |
| HQ | London, UK | London, UK |
| Team size | 55–200 | ~400,000 |
| Rating | 4.3 / 5 | 4.2 / 5 |
| Primary differentiator | Fundamental rights and ethics impact assessments from a research-led firm | AI risk work folded into existing technology risk and controls programs |
| Pricing model | Project fees; rates on request | Engagement fees per scope; rates not published |
| Min. engagement | Not disclosed | Not disclosed |
| Primary tech stack | EU AI Act, GDPR, ISO/IEC 42001 | EU AI Act, NIST AI RMF, GDPR |
| Industries served | Public sector, Law enforcement, Healthcare, Financial services | Financial services, Insurance, Public sector, Energy, Consumer |
Trilateral Research vs EY: overview
Trilateral Research
Trilateral Research was established in 2004 and is headquartered in London, with an Irish operations center in Waterford. It began in research and data protection and now advises on responsible AI, including fundamental rights impact assessments of the kind the EU AI Act requires for some high-risk deployments. Directory estimates of its size range from about 55 to 200 people. It also builds its own ethical AI software, mostly for public-sector and law-enforcement users.
EY
EY was formed by the 1989 merger of Ernst & Whinney and Arthur Young and employs about 400,000 people. Its advisory teams cover responsible AI, AI risk, and compliance programs, and its technology risk leaders have spoken publicly about how far real AI assurance still has to go. That candor is useful for buyers who want an honest view of what can be certified today. Like the rest of the Big Four, it sells implementation as well.
Services and capabilities: Trilateral Research vs EY
| Capability | Trilateral Research | EY |
|---|---|---|
| Readiness assessment | ✓ | ✓ |
| Use-case prioritization | ✗ | ✗ |
| TCO / ROI modeling | ✗ | ✗ |
| AI governance & EU AI Act | ✓ | ✓ |
| Build vs. buy advice | ✗ | ✗ |
| Independent audit or assurance | ✗ | ✓ |
| Roadmap any vendor can implement | ✗ | ✗ |
| Delivery capability after advice | ✗ | ✓ |
Frameworks and platforms: Trilateral Research vs EY
| Framework / platform | Trilateral Research | EY |
|---|---|---|
| EU AI Act | ✓ | ✓ |
| GDPR | ✓ | ✓ |
| DORA | N/A | N/A |
| NIST AI RMF | N/A | ✓ |
| ISO/IEC 42001 | ✓ | N/A |
| Azure | N/A | ✓ |
| AWS | N/A | N/A |
| Google Cloud | N/A | N/A |
Pricing comparison: Trilateral Research vs EY
| Criterion | Trilateral Research | EY |
|---|---|---|
| Minimum engagement | Not disclosed | Not disclosed |
| Engagement models | Fixed-scope assessment, Ongoing advisory | Fixed-scope assessment, Multi-use-case advisory, Audit or certification, Delivery team |
| Rate transparency | Not public | Not public |
| Price tier | Mid-market | Mid-market |
Target audience comparison: Trilateral Research vs EY
| Dimension | Trilateral Research | EY |
|---|---|---|
| Best company size | Startup to mid-market | Enterprise |
| Best industries | Public sector, Law enforcement, Healthcare | Financial services, Insurance, Public sector |
| Best use cases | Fundamental rights impact assessments for high-risk AI., Ethics reviews of public-sector AI systems. | Adding AI risk to an existing controls framework., Responsible AI policies for a large insurer. |
| Typical project type | Fixed-scope assessment | Fixed-scope assessment |
Trilateral Research vs EY: pros and cons
| Trilateral Research | |
|---|---|
| + | Two decades of research on ethics and data protection |
| + | Fundamental rights impact assessments are a core skill |
| + | Independent of the big cloud and software vendors |
| - | Small team for large multi-country programs |
| - | Builds its own software, which can shape recommendations |
| - | Less focus on cost modeling or business cases |
| EY | |
|---|---|
| + | Ties AI risk to controls frameworks finance teams already use |
| + | Realistic public view on the limits of AI assurance |
| + | Large global bench |
| - | Premium fees |
| - | Sells delivery alongside advice |
| - | Audit-client independence rules apply |
Who should choose Trilateral Research?
A typical fit: fundamental rights impact assessments for high-risk AI.
Fundamental rights and ethics impact assessments from a research-led firm. Minimum engagement is not publicly disclosed. Works best with clients in Public sector, Law enforcement, Healthcare, Financial services.
Who should choose EY?
A typical fit: adding AI risk to an existing controls framework.
AI risk work folded into existing technology risk and controls programs. Minimum engagement is not publicly disclosed. Works best with clients in Financial services, Insurance, Public sector, Energy, Consumer.
Decision matrix: Trilateral Research vs EY
| Your situation | Recommended choice |
|---|---|
| You want advice with no build contract attached | Trilateral Research |
| Finance needs run costs before approving anything | Neither lists cost modeling; ask for a sample |
| Some of your use cases may be high-risk under the EU AI Act | Both cover AI Act classification |
| You need an outside check on a system already built | EY |
| You want the same firm to build what it recommends | EY |
| Your budget is at the lower end | Compare: Trilateral Research (Not disclosed) vs EY (Not disclosed) |
| You need advisers in many countries at once | EY |
Use case fit: Trilateral Research vs EY
| Use case | Trilateral Research fit | EY fit | Winner |
|---|---|---|---|
| Fundamental rights impact assessments for high-risk AI. | Strong | Limited | Trilateral Research |
| Ethics reviews of public-sector AI systems. | Strong | Limited | Trilateral Research |
| Adding AI risk to an existing controls framework. | Limited | Strong | EY |
| Responsible AI policies for a large insurer. | Limited | Strong | EY |
Verdict: Trilateral Research vs EY
Trilateral Research (4.3/5) is the stronger overall choice for most AI Advisory projects. Fundamental rights and ethics impact assessments from a research-led firm.
EY (4.2/5) is worth a look if you need responsible AI policies for a large insurer. If your situation matches that, EY is a competitive option.
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Trilateral Research vs EY FAQ
Is Trilateral Research better than EY?
Trilateral Research (4.3/5) scores higher overall, but "better" depends on your use case. Trilateral Research's strongest advantage: two decades of research on ethics and data protection. EY's strongest advantage: ties AI risk to controls frameworks finance teams already use.
How do Trilateral Research and EY differ in pricing?
Trilateral Research's pricing: project fees; rates on request. EY's pricing: engagement fees per scope; rates not published. Any hourly bands shown come from Clutch, not a published rate card, so a scoping call is still needed for a project quote.
Which is better for enterprise: Trilateral Research or EY?
EY is the larger team and typically the better enterprise-scale choice. For very large programmes, verify team size and compliance coverage directly with each firm before shortlisting.
What are the main differences between Trilateral Research and EY?
Trilateral Research's primary differentiator is: fundamental rights and ethics impact assessments from a research-led firm. EY's primary differentiator is: AI risk work folded into existing technology risk and controls programs. They also differ in team size (55–200 vs ~400,000), minimum engagement (Not disclosed vs Not disclosed), and primary industries served (Public sector, Law enforcement vs Financial services, Insurance).
Verify all details directly with each firm before making a decision.