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In finance, market data is price and trade-related data for a financial instrument reported by a trading venue such as a stock exchange. Market data allows traders and investors to know the latest price and see historical trends for instruments such as equities, fixed-income products, derivatives and currencies. The market data for a particular instrument would include the identifier of the instrument and where it was traded such as the ticker symbol and exchange code plus the latest bid and ask price and the time of the last trade. It may also include other information such as volume traded, bid and offer sizes and static data about the financial instrument that may have come from a variety of sources. There are a number of financial data vendors that specialise in collecting, cleaning, collating and distributing market data and this has become the most common way that traders and investors get access to market data. Delivery of price data from exchanges to users, such as traders, is highly time-sensitive and specialized technologies designed to handle collection and throughput of massive data streams are used to distribute the information to traders and investors. The speed that market data is distributed can become critical when trading systems are based on analysing the data before others are able to, such as in high-frequency trading. Market price data is not only used in real time to make on-the-spot decisions about buying or selling, but historical market data can also be used to project pricing trends and to calculate market risk on portfolios of investments that may be held by an individual or an institutional investor. ==Data structure== A typical equity market data message or business object furnished from NYSE, TSX, or NASDAQ might appear something like this: The above example is an aggregation of different sources of data, as quote data (bid, ask, bid size, ask size) and trade data (last sale, last size, volume) are often generated over different data feeds. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Market data」の詳細全文を読む スポンサード リンク
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