TOLL targets companies with monopolistic or oligopolistic industry structures that have strong competitive advantage and little or no competition. The broad portfolio may include infrastructures such as toll roads, stock exchanges, data, payments, healthcare and patented pharmaceutical companies. The fund selects 15-100 stocks considered highly concentrated by using the Herfindahl-Hirschman Index (HHI), a well-known measure of market concentration that calculates a companys relative size compared to the industry.