What Is Know Your Business (KYB)? Definition, Process and Compliance Guide

KYB is a due diligence process that identifies, verifies and validates a company before you do business with it. It goes beyond collecting a company name and address: it requires confirming legal status, activity, directors, and the individuals who ultimately own or control it.

Three pillars structure any KYB process:

• Company identification: legal name, registration number, legal form and business activity.
• Legal existence verification: confirming the company is active, properly registered and in good standing.
• Beneficial ownership: knowing who really controls the entity, beyond the names listed on paper.

KYB is modelled on the due diligence obligations long imposed on financial institutions, but it now extends far beyond banking. Marketplaces, insurers, lenders, real estate platforms and B2B SaaS companies all rely on it to secure their partnerships.

KYB and KYC are frequently confused because they share the same objective: preventing fraud and financial crime. The distinction is simple: KYC verifies individual customers, while KYB verifies companies.

In practice, the two overlap. A KYB check almost always includes an identity verification step for the company's legal representatives, which is a KYC process applied to a person acting on behalf of a business.

Beyond ticking a regulatory box, KYB delivers concrete business value.

Picture a UK payments platform onboarding a new merchant partner: without a structured KYB process, a single unverified shell company can slip through, exposing the platform to fraud, regulatory scrutiny and weeks of retroactive remediation. With the right checks in place, the same verification can be completed before the contract is even signed.

• Regulatory compliance: meeting obligations under UK anti-money laundering law and avoiding penalties.
• Fraud prevention: shell companies are a well-documented cover for criminal activity, from invoice fraud to money laundering.
• Risk management: calibrate the level of scrutiny to the risk each partner represents.
• Trust and reputation: work only with legitimate, verified partners.
• Faster onboarding: automated registry checks return results in seconds, where manual verification means chasing several sources in sequence.

While the exact requirements vary by sector and risk level, most KYB processes follow the same four stages.

The process starts with basic identifying information: legal name, registration number, registered address and business activity. This data is used to locate the company in official registries.

Once identified, the company's legal existence and status are checked against official sources, such as Companies House in the UK. This step confirms the business is active, correctly registered and that the information provided matches official records.

UK rules require identifying any individual who ultimately owns or controls more than 25% of the shares or voting rights in the company, or who otherwise exercises control over it. This is often the most complex step, particularly for companies with layered or international ownership structures.

In practice, UBO identification typically combines data retrieved from official registries (where available) with supporting documents provided directly by the company and identity verification of the individuals concerned.

KYB does not end once a relationship is established. Regulated firms must conduct ongoing monitoring of the business relationship and keep the information obtained through due diligence up to date. In practice, this means periodic re-checks and continuous screening against sanctions and politically exposed persons (PEP) lists.

Requirements vary between industries and jurisdictions, but the table below summarises what a typical KYB check verifies.

Manual KYB is difficult to scale. This is where verification platforms such as Youtrust Verify come in, combining several checks into a single, API-driven workflow.

• Company Registry Verification automatically confirms a company's legal existence and authenticity from official registries — including Companies House in the UK — using a business identifier or corporate documents.
• Legal Representative Identity Verification retrieves information on the company's legal representatives from registry data and confirms their identity through an automated document check.
• Watchlist Screening checks companies and individuals against more than 280 international sanctions and PEP lists, including OFAC, HM Treasury and EU consolidated lists, with the option to set up ongoing monitoring after the initial check.
• Document Trust analyses submitted company documents for signs of fraud or tampering and returns a clear risk score.

Combining these building blocks lets you construct a KYB workflow that matches your actual risk exposure, instead of relying on a single, one-size-fits-all check. Note that for more complex requirements — such as automated UBO data retrieval — availability depends on the jurisdiction and your regulatory context; your compliance team should define what additional steps are needed beyond automated registry checks.

Once a business partner has passed these checks, the next step is usually to formalise the relationship in writing. This is where Youtrust's electronic signature solution comes in: contracts, framework agreements or supplier terms can be signed remotely in minutes. Under UK eIDAS, an electronic signature cannot be denied legal effect solely because it is electronic, and a qualified electronic signature (QES) carries the same legal effect as a handwritten signature. Pairing verified onboarding with electronic signature closes the loop between knowing who you are dealing with and formally engaging with them.

KYB obligations in the UK sit within the broader anti-money laundering (AML) and counter-terrorist financing (CTF) framework. Regulated businesses, including banks, payment institutions, and certain professional service firms, must apply customer due diligence measures under the Money Laundering, Terrorist Financing and Transfer of Funds (Information on the Payer) Regulations 2017 (MLR 2017), enforced in the financial sector by the Financial Conduct Authority (FCA).

Regulation 28 of MLR 2017 requires regulated businesses to identify the customer and, where the customer is beneficially owned by another person, to take reasonable measures to understand the ownership and control structure of that entity before establishing a business relationship.

Internationally, these obligations are shaped by the recommendations of the Financial Action Task Force (FATF), the global standard-setter for anti-money laundering policy. Recommendation 24 was revised in March 2022 to strengthen transparency requirements on beneficial ownership.

Running KYB checks at scale raises recurring challenges:

• Manual verification is slow and does not scale with growing onboarding volumes.
• Complex ownership structures make identifying UBOs behind holding companies or trusts time-consuming.
• Fragmented data sources: each country has its own registry format, making cross-border checks harder.
• Document fraud: falsified certificates of incorporation can slip through basic checks.

Best practice: apply a risk-based approach, rely on official registry data rather than self-declared information, automate document authenticity checks, and screen every new partner against sanctions and PEP lists before onboarding, then periodically afterwards.

One UK-specific caveat matters here. MLR 2017 states that regulated firms do not satisfy their beneficial ownership obligations by relying solely on the register of people with significant control (PSC) held at Companies House. Registry data is the starting point, not the whole answer: it needs to be corroborated with independent sources and supporting documents.

KYB is no longer optional for businesses that want to trade safely with other companies. A structured process, built on official registry data, beneficial ownership checks and ongoing monitoring, protects you from fraud, regulatory penalties and reputational damage. Automating these checks, rather than running them manually, is increasingly what separates businesses that onboard partners quickly from those slowed down by manual back-and-forth.