Mr. Arenas’s recent work has focused on competition matters, damages quantification, commercial litigation, regulation, and merger control. He has acted as a signing expert in cartel damages litigations in Spain, including for matters related to the raw milk and envelopes cartels, and has been involved in cartel-related damages work in Portugal in the banking sector. In addition, Mr. Arenas has acted as a signing expert in several commercial litigation cases in the real estate sector and has participated in other commercial litigation matters in the payments and automotive parts sectors. His experience centers on the preparation of expert reports and economic analyses in litigation and regulatory contexts, particularly in Europe and Latin America. He has also worked on a range of other competition and regulatory matters, including contributing to a study commissioned by the European Commission evaluating the implementation and effectiveness of antitrust remedies over the last 20 years. His broader advisory experience includes work related to the new tax on the banking sector in Spain, interchange fee regulation in Chile, significant market power and remedies in telecommunications, and merger analysis in the advertising sector.

Prior to joining NERA, Mr. Arenas worked on competition, regulatory, and arbitration matters in Peru, where he advised clients in sectors such as gas, construction, telecommunications, ports, consumer goods, cement, and payment systems. His work included cartel-related matters, internal investigations, tariff reviews, competition compliance assessments, regulatory due diligence, and damages estimation in litigation and arbitration contexts. He also advised on the estimation of illicit gains in cartel cases, abuse of dominance matters, and regulatory and damages issues arising in infrastructure- and energy-related disputes.