Small cap schemes invest in very small companies or their stocks. According to the Sebi mandate, small cap schemes must invest in companies that are ranked below 250 in terms of market capitalisation. These schemes also will have to invest at least 65% in small cap stocks. Small cap schemes invest in very small companies or their stocks. According to the Sebi mandate, small cap schemes must invest in companies that are ranked below 250 in terms of market capitalisation. These schemes also will have to invest at least 65% in small cap stocks. Economic Times