The number of
shares outstanding in a company that is sufficient to be able to control the company. In a
publicly-traded company, the control value may be 50% + 1 for ordinary decisions, or a
supermajority of
shares for more important decisions. If one person or company
owns a control value, such shares command a higher
price than other shares because each share represents a level of oversight in the company that non-control shares do not possess.