Legal Entity Identifier or LEI meaning

In practice, a Legal Entity Identifier (LEI) is a standardised 20‑character alpha‑numeric code (ISO 17442) that uniquely identifies companies, funds and other legal entities in financial markets. Issued by GLEIF‑accredited providers, it is used widely in transaction reporting, instrument reference data, admissions/listings, and market abuse disclosures. In the UK, under onshored mifir (and RTS 22/23), investment firms must report clients’ LEIs for transaction reporting (the “no LEI, no trade” principle). Trading venues/market operators must obtain and report the issuer’s LEI for financial instruments admitted to trading and in instrument reference data. Under UK MAR and FCA disclosure templates, LEIs identify issuers and persons discharging managerial responsibilities (PDMRs) in regulatory filings. In Ireland, equivalent obligations apply under EU MiFIR/MAR and ESMA standards. Usage and meaning are consistent across England & Wales, Scotland, Northern Ireland and Ireland; the underlying legal sources differ (UK onshored law overseen by the FCA versus EU law supervised by the Central Bank of Ireland). Practical points: LEIs require annual renewal and must match exactly in filings. Firms should confirm counterparties’ and issuers’ LEIs on the GLEIF database before trading, listing or making disclosures.