Top 10 Best Third Party Due Diligence Services of 2026

EY typically runs due diligence engagements with structured workplans that cover counterparty background, ownership and control inquiries, and risk-relevant fact gathering for specific diligence scopes. Teams can expect engagement governance artifacts like issue logs, evidence requests, and decision memos that map findings to contract and compliance recommendations.

A clear tradeoff is that EY relies on human-led delivery for most value rather than a fully self-serve dashboard workflow. EY fits well when a firm needs evidence-grade documentation for audit or regulatory inquiries, and it also fits situations where third-party risk reviews must align with internal risk-rating methodology and remediation tracking expectations.

Kroll’s core capability is operational diligence work that blends screening outputs with case development, document review, and risk narrative construction for specific counterparties. This depth tends to fit engagements where internal teams need defensible findings, including beneficial ownership verification and litigation or regulatory enforcement research tied to the entity and its principals. Kroll also fits organizations that require consistent deliverables across multiple geographies rather than relying only on automated screening results.

A tradeoff appears in the time-to-deliver for investigation-heavy work compared with screening-only providers that return faster outputs. Kroll works best when governance teams can provide entity inputs early and define the risk questions for principals, ownership layers, and affiliates before evidence collection begins.

Deloitte works through structured diligence programs that combine counterparty screening coverage with compliance-oriented assessment of operational, regulatory, and third-party obligations. Typical deliverables include risk assessment narratives, remediation roadmaps, and oversight guidance for vendor onboarding, refresh, and fourth-party disclosure expectations. This approach fits organizations that need accountable decision support and defensible methodology, not just data pulls or screening output.

A key tradeoff is that Deloitte delivery is service-led, so throughput and automation depth depend on engagement design and staffing rather than self-serve provisioning. Deloitte is a strong fit when deals require rapid governance decisions, complex evidence mapping, or integration between diligence outcomes and contract and monitoring processes.

PwC brings large-firm due diligence delivery to vendor risk management with a workflow that combines counterparty inquiry, evidence handling, and risk narrative outputs for internal governance. Its strength centers on end-to-end advisory execution for KYC and risk screening programs that require coordinated workstreams across compliance, legal, and operational stakeholders.

KPMG delivers third-party due diligence as a managed advisory service that combines KYC and sanctions screening with risk-focused investigations and remediation guidance for counterparties. The firm can execute beneficial ownership verification and adverse media and litigation or regulatory enforcement checks as part of wider vendor risk management workflows.

TRACE supports third-party due diligence and vendor risk management with a workflow focused on counterparty screening and evidence-led case building. Its distinct angle is the way it packages investigation results for audit-ready sharing, including remediation tracking and ongoing refresh workflows.

Ankura is a due diligence and investigations firm that differentiates itself through structured case execution and evidence-led workflows across complex cross-border risk. It typically combines counterparty and adverse media screening deliverables with financial health and regulatory or litigation checks that map to vendor risk questions.

RSM delivers third-party due diligence services that combine credit, risk screening, and investigative analysis into structured vendor and counterparty outputs. Delivery teams typically manage evidence collection, third-party risk questionnaires, and remediation follow-through as part of the diligence workflow.

FTI Consulting delivers third-party due diligence and risk analytics built around structured evidence collection, counterparty screening, and documented risk-rating methodology. The firm is strongest in complex investigations that mix regulatory and litigation checks with reputation and integrity signals, then translate findings into remediation tracking and decision-ready summaries.

The Risk Advisory Group delivers third-party due diligence and vendor risk management for organizations that need counterparty screening, evidence-backed risk writeups, and decision-ready reporting. The firm’s work centers on practical risk assessments across compliance, financial stability signals, and operational risk considerations used in vendor selection and ongoing oversight.