An investor is a person who puts in his money in ventures in anticipation of profits. A shareholder is strictly an investor who trades in shares and stocksshares and stocksA stock is measured at one specific time, and represents a quantity existing at that point in time (say, December 31, 2004), which may have accumulated in the past. A flow variable is measured over an interval of time. Therefore, a flow would be measured per unit of time (say a year).
› wiki › Stock_and_flowStock and flow - Wikipedia of companies that are traded publicly.Jun 11, 2011