A securities class action is a lawsuit brought on behalf of a group of investors who have suffered an economic loss in a particular stock or security as a result of fraudulent stock manipulation or other violations of securities laws. Such cases are brought by one or more investors in the stock, known as "Lead Plaintiffs" on behalf of all others who have suffered financial losses as a result of purchasing shares in a company during the period of time the fraud or securities laws violations artificially inflated the value of the stock (known as the "class period").