Stjepan Kumrić is the general manager of Lukavac Cement d.o.o. Lukavac is also the president of the company's Board of Directors. He is also the president of the Supervisory Board of the Limestone Mine "Vijenac" d.o.o. Lukavac, member of the Supervisory Board of CEMMAC a.s. Slovakia and procurator in the company Lukavac Cement HR d.o.o. Croatia.