What Is an LEI Code? A Complete Guide for Belgian Companies
If your business has ever tried to buy shares, trade bonds, or report a derivatives contract, you may have met a requirement that halts everything until it's satisfied: a valid LEI code. The Legal Entity Identifier has become essential infrastructure in global finance, and for many companies active in the markets it isn't optional.
What is an LEI code?
A Legal Entity Identifier (LEI) is a 20-character alphanumeric code that uniquely identifies a legal entity taking part in the financial markets. Defined by the international standard ISO 17442 and overseen by GLEIF (the Global Legal Entity Identifier Foundation), it works like a global ID card for your company: the same code identifies you in any country and on any trading venue.
Unlike most business numbers, the LEI is global and open — anyone can publicly look up any LEI and confirm an entity's legal name, address, and status.
Why the LEI system exists
The LEI was born out of the 2008 financial crisis, when regulators found there was no consistent global way to identify the parties to financial transactions. In response, the G20 and the Financial Stability Board (FSB) called for a single system. The result was the Global LEI System, overseen by the Regulatory Oversight Committee (ROC) and operated since 2014 by GLEIF.
Who needs an LEI code in Belgium?
Since MiFID II and EMIR came into force, the rule is blunt: "no LEI, no trade." In Belgium, market supervision is carried out by the FSMA (the Financial Services and Markets Authority).
You need an LEI if your company buys or sells shares, bonds or fund units; enters derivatives contracts (EMIR reporting); invests through a securities account; or acts as a fund, holding or investment vehicle. This applies as much to a listed company as to an SRL, SA or even a non-profit (ASBL) investing its reserves.
How to get and keep your LEI
Registration is simple: you provide your company's legal details — name, enterprise number (BCE) and registered address — which are checked against the official registry. Your LEI is then issued and published in GLEIF's public database. An LEI must be renewed every year; a lapsed LEI can block your transactions just like not having one. TrustedLEI handles registration, renewal and transfers, with French-language support.