The principal activities of INA and its subsidiaries (the group), are:
Exploration and production of oil and gas in Croatia and abroad
Processing of oil and production of oil derivatives in the refineries located in Rijeka (Urinj) and Sisak, where fuels production is located, and Rijeka (Mlaka) and Zagreb, where lubricants are produced
Retail sales of oil derivatives and other products through a retail network comprising over 400 petrol stations in Croatia, and 50 petrol stations in neighbouring countries
Trading in crude oil and oil derivatives
Supply of natural gas and sales of imported and domestic natural gas to industrial consumers and distributors - Prirodni plin d.o.o.
Provision of drilling, workover and other services related to oil and gas exploration and production, both on-shore and off-shore - services are provided by Crosco-Naftni Servisi d.o.o.
Provision of services related to the construction of oil pipelines, gas pipelines, processing plants and processing plant maintenance - services are provided by STSI d.o.o.
Production and sales of lubricants - Maziva-Zagreb d.o.o.
Production and trade in liquefied natural gas - Proplin d.o.o.