Argyrios Papaefthymiou

Argyrios is a Senior Associate of our Antitrust & Competition practice. He has extensive experience on a wide range of advisory, investigative and transactional competition and regulatory matters, including cross-border merger control, antitrust, State aid, foreign subsidies and foreign direct investment screening. He advises corporates and private equity clients across diverse sectors, including aviation, digital markets, chemicals, construction, consumer goods, energy, finance, pharmaceuticals, sports, technology and telecommunications. Prior to joining Zepos & Yannopoulos, Argyrios worked for a number of years as a competition lawyer in international law firms in London and Brussels. Before that, he completed traineeships at the European Commission (DG COMP, State aid – financial institutions) and the World Trade Organization. Argyrios is formally trained as a lawyer and an economist. He is dually qualified in Greece (Court of Appeals) and England and Wales (Solicitor of the Senior Courts). He joined our firm in 2025. · Zepos & Yannopoulos

GreeceAntitrust & Competition, Merger Control

About

Argyrios Papaefthymiou is a Senior Associate in the Antitrust & Competition practice at Zepos & Yannopoulos in Greece (joined 2025), advising corporates and private equity clients on advisory, investigative and transactional competition and regulatory matters — including cross-border merger control, antitrust, State aid, foreign subsidies and foreign direct investment screening — across sectors such as aviation, digital markets, chemicals, construction, consumer goods, energy, finance, pharmaceuticals, sports, technology and telecommunications. He previously worked as a competition lawyer in international firms in London and Brussels, completed traineeships at the European Commission (DG COMP, State aid – financial institutions) and the World Trade Organization, is formally trained in law and economics, and is dually qualified in Greece (Court of Appeals) and England & Wales (Solicitor of the Senior Courts).

Practice areas

Antitrust & CompetitionMerger ControlState AidForeign SubsidiesForeign Direct Investment ScreeningRegulatory

Office

Greece

Zepos & Yannopoulos · Argyrios is a Senior Associate of our Antitrust & Competition practice. He has extensive experience on a wide range of advisory, investigative and transactional competition and regulatory matters, including cross-border merger control, antitrust, State aid, foreign subsidies and foreign direct investment screening. He advises corporates and private equity clients across diverse sectors, including aviation, digital markets, chemicals, construction, consumer goods, energy, finance, pharmaceuticals, sports, technology and telecommunications. Prior to joining Zepos & Yannopoulos, Argyrios worked for a number of years as a competition lawyer in international law firms in London and Brussels. Before that, he completed traineeships at the European Commission (DG COMP, State aid – financial institutions) and the World Trade Organization. Argyrios is formally trained as a lawyer and an economist. He is dually qualified in Greece (Court of Appeals) and England and Wales (Solicitor of the Senior Courts). He joined our firm in 2025.

Greece

Expertise

AviationDigital MarketsChemicalsConstructionConsumer GoodsEnergyFinancePharmaceuticalsSportsTechnologyTelecommunicationsPrivate EquityCompetition InvestigationsCross-border Merger Control

Education

Formal training in Law and Economics

Admissions

Greece (Court of Appeals)
England and Wales (Solicitor of the Senior Courts)