The process of investigating a supplier or business partner before engagement to assess financial, legal, reputational, and compliance risks.
Also known as: Supplier Due Diligence, Third-Party Due Diligence, Vendor Screening
Vendor due diligence is the process of investigating a potential or existing supplier, contractor, or business partner before entering a commercial relationship or processing payments. It assesses financial stability, legal standing, reputational risk, and — critically — sanctions and regulatory compliance.
Modern due diligence goes beyond basic credit checks. It includes screening vendor names and their ultimate beneficial owners against government watchlists, verifying corporate registration documents, assessing the vendor's own compliance posture, and establishing ongoing monitoring to catch changes after initial onboarding.
Due diligence typically runs in two phases:
Onboarding Due Diligence occurs before a vendor is approved for use. This includes collecting company documents, verifying legal entity information, checking against sanctions and watchlists, and assessing business reputation through media and regulatory databases.
Continuous Monitoring maintains ongoing vigilance after approval. Sanctions designations, legal actions, and regulatory changes can affect a vendor that was clean at onboarding. Effective programs re-screen all active vendors on a defined schedule — typically daily or weekly — and trigger alerts when a change is detected.
Regulatory exposure is the primary driver of vendor due diligence investment. OFAC, the EU, and the UN issue sanctions designations that prohibit transactions with listed entities. A payment to a sanctioned vendor — even one made unknowingly — can result in penalties exceeding $1 million per transaction.
Beyond sanctions, vendor due diligence protects against:
SanctionShield AI automates the sanctions screening component of vendor due diligence at scale. A single API call screens a vendor name and its beneficial owners against OFAC, EU Consolidated List, UN Security Council, HM Treasury, and other major watchlists simultaneously, returning a match score and detailed results within seconds.
Enterprises integrate SanctionShield AI into their vendor management systems to enforce screening at onboarding and trigger automated daily re-screening of all active vendors — eliminating the manual review bottleneck without reducing coverage.