From the Collaborative Bond and Money Market Data Portal
Legal Entity Identifier or LEI is a unique identity reference code allocated to an entity recognised by law as legally existing in accordance with an internationally agreed standard administered by the Regulatory Oversight Committee (ROC) of the Global Legal Entity Identifier System (GLEIS). The ROC is a stand-alone committee established by the international Financial Stability Board (FSB) and endorsed by the Group of 20 (G-20) nations. The ROC has authorised Local Operating Units (LOU) which generate and issue the LEIs. In the Collaborative Market Data Model we record available LEIs for issuers. For further information see here.