Requirements imposed on companies by the various national exchanges that they must meet in order to be part of the trading activity on that particular exchange. Listing requirements vary between the NYSE, NASDAQ, AMEX, etc., but in all cases the company's stock must meet a minimum share price, the company must possess a minimum asset value, there must be minimum number of shareholders, so on and so forth. In addition, to initial listing requirements all national exchanges maintain ongoing listing requirements and corporate governance standards which must be satisfied.