Bulgarian Prime Minister Ivan Kostov, on a working visit to the United States since Monday, made a half hour address to a hundred representatives of leading US companies, members of the US Chamber of Commerce, and answered questions for as long after that. In his address, Kostov said that Bulgaria seeks foreign investors mainly in the energy sector and telecommunications, and also in water supply, electronics, the food-processing industry, transport, farming, machine-building, the military industry and tourism.