Training for “Millennium IT” system, being implemented at Mongolian Stock Exchange under the “Master agreement” of State Property Committee of Mongolia, Mongolian Stock Exchange, and London Stock Exchange, was organized at Mongolian Stock Exchange for its all member Broker and Dealer companies. This training lectured by three specialists from “MILLENNIUM IT” company, the subsidiary company of LSE, and all Broker and Dealer companies participated actively. The training covered following topics: functional features, introducing new trading platform, and how to access Central Securities Depository system. On next phase of technical implementation, we will conduct UAT (User Acceptance Test) and mock run for brokers and dealers.