Fontbona and her family control Antofagasta, the Santiago-based mining company. Through the publicly-traded company Quiñenco, they control Banco de Chile, Madeco, a copper products manufacturer, the country's largest brewer CCU, and a shipping company, CSAV. CSAV is the world's 16th largest shipping company as measured by TEUs. In 2013, she controlled 65% of Antofagasta.