INI included a broad range of companies, from heavy and basic industries to "soft" services, most of them with E.N., standing for Empresa Nacional (National Corporation), in their names. Among them were: Ensidesa (Empresa Nacional Siderúrgica S.A.)–Aceralia (steel), Enasa (Empresa Nacional de Autocamiones S.A.)–Pegaso (trucks), SEAT (Sociedad Española de Automóviles de Turismo) (cars), INH (Instituto Nacional de Hidrocarburos)–Repsol (Refinería de Petróleos de Escombreras Oil) (oil and gas), ENCE (Empresa Nacional de Celulosas de España) (cellulose, biofuels), ENDASA (Empresa Nacional de Aluminio S.A.) (aluminium), Endesa (Empresa Nacional de Electricidad S.A.) (power), ENFERSA (Empresa Nacional de Fertilizantes S.A.) (fertilizers), E.N.
INI encompassed a wide array of companies, ranging from heavy and basic industries to "soft" services, most of them bearing the designation E.N., signifying Empresa Nacional (National Corporation), in their names. Among these were: Ensidesa (Empresa Nacional Siderúrgica S.A.)–Aceralia (steel), Enasa (Empresa Nacional de Autocamiones S.A.)–Pegaso (trucks), SEAT (Sociedad Española de Automóviles de Turismo) (cars), INH (Instituto Nacional de Hidrocarburos)–Repsol (Refinería de Petróleos de Escombreras Oil) (oil and gas), ENCE (Empresa Nacional de Celulosas de España) (cellulose, biofuels), ENDASA (Empresa Nacional de Aluminio S.A.) (aluminium), Endesa (Empresa Nacional de Electricidad S.A.) (power), ENFERSA (Empresa Nacional de Fertilizantes S.A.) (fertilizers), E.N.