INA is vertically integrated oil and gas company operating in oil and gas exploration and production, refining and marketing of oil products. Its subsidiaries are engaged in LPG business, natural gas transportation and providing integradted oilfield services. INA is a medium-sized European oil company and a significant regional player.

Exploration and production of oil and gas in Croatia and abroad (licence interests are held in Angola, Albania, Algeria, Libya, Egypt, Syria and Russia)
Processing of crude through fuels refineries located at Rijeka (Urinj) and Sisak, and the Rijeka (Mlaka) and Zagreb lubricants plants
Distribution of fuels and associated products through a chain of some 401 retail outlets currently in operation throughout Croatia
Trading in oil, derivates and other products
Wholesale and retail LPG business in Croatia (Proplin d.o.o.)
Providing onshore and offshore oil related services through its drilling and oilfield services sub-sidiary (Crosco d.o.o.)