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The Market Identifier Code (MIC) (ISO 10383) is a unique identification code used to identify securities trading exchanges, regulated and non-regulated trading markets. The MIC is a four alphanumeric character code, and is defined in ISO 10383.[1] by the International Organization for Standardization (ISO).[2] For example, trades that are executed on the US NASDAQ market are identified using MIC code XNAS.

Exchange (operating MIC) vs Market (MIC) MIC codes are allocated at two levels: Exchange (operating MIC). E.g. NASDAQ has code XNAS

Market (MIC), where the exchange's operating MIC is also used as MIC of its main market or "all" markets. Eg NASDAQ markets have these MICs: XNAS: NASDAQ - All Markets XNCM: NASDAQ Capital Market XNDQ: NASDAQ Options Market XNFI: NASDAQ Fixed Income Trading XNGS: NASDAQ/NGS (Global Select Market) XNIM: NASDAQ Intermarket The site Iota Finance[3] provides a useful reference of MIC codes that is updated regularly.

The Financial Instrument Global Identifier (FIGI) (formerly Bloomberg Global Identifier (BBGID)) is an open standard, unique identifier of financial instruments that can be assigned to instruments including common stock, options, derivatives, futures, corporate and government bonds, municipals, currencies, and mortgage products.