He was Chairman of Royal Dutch Shell of Argentina for fifteen years and served as Minister of Energy during the Mauricio Macri's administration.

Aranguren arranged the removal of state subsidies to electricity, gas, and water distribution, which caused a huge increase in taxes for those services.

[2] Those increases were met by protests in numerous cities by people bearing banners, bugles, and noise-making cacerolazos.

[7] On 5 November 2017, the Paradise Papers, a set of confidential electronic documents relating to offshore investment, revealed that Aranguren have managed two offshore companies, Shell Western Supply and Trading Limited and Sol Antilles y Guianas Limited, both subsidiaries of Royal Dutch Shell.

One is the main bidder for the purchase of diesel oil by the current government through the state owned CAMMESA (Compañía Administradora del Mercado Mayorista Eléctrico).