From 3rd January 2018 MiFID (Markets in Financial Instruments Directive) II require that all companies that make transactions in financial instruments which are traded or which underlying assets are traded on a trading venue have LEI.
The LEI (Legal Entity Identifier) is a global legal entity identifier, consisting of a 20-digit alphanumeric code. The LEI code is unique, it shall be issued once for a specific legal entity and the same code cannot be issued to another legal entity. The LEI code does not replace the registry code of the commercial register of the Republic of Estonia. In Estonia, the registry code is still used to identify a legal entity.
An LEI code can be applied for from separately authorised agencies, information on which can be found on the Global Legal Entity Identifier Foundation homepage. There are a number of different opportunities and the selection can be made freely. Unfortunately, there is no agency in Estonia that issues LEI codes. Since each LEI code is unique, a code issued elsewhere is also valid in Estonia.
You can apply LEI through EPC Finance. LEI registration fee is 79 eur / year.
LEI check: https://www.gleif.org/en/lei/search