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Home Categories Trading Basic Education A large trader is an investor or entity whose trades equal or exceed volume and market value thresholds set by the Securities and Exchange Commission (SEC). Level 1 is a type of trading screen used in stock trading that displays real-time quotes for the best national bid and ask prices for a security. Limit down is a decrease in the price of a futures contract or stock, sufficient to trigger trading restrictions. Liquid markets have many buyers and sellers available, where prices move in relatively small increments. Liquidity refers to the ease with which an asset or security can be converted into cash without affecting its market price. Profit taking refers to the realization of previously unrealized profits accumulated in a security by closing all or part of the holdings. A market order is an instruction to buy or sell a security immediately at the current price. Order matching is the process of identifying and making a trade between equal and opposite requests for a security (i.e. buying and selling at the same price). Naked short selling is the now illegal practice of shorting stocks that have not been proven to exist.# Negative carryover is a condition in which holding on to an investment costs more than it earns in the short term.