Normal Market Size A share classification structure based on the number of shares outstanding. This determines the number of shares that a market maker can trade at the quoted price. Investopedia Says: Buying or selling in amounts above the set number of shares requires price negotiation with the market maker. The NMS system reduces the effect a market maker's trading activity may have on the share price of a stock that has shares outstanding in the low thousands. Related Terms: Market Maker Outstanding Shares |