Leonidas Theodosiou focuses his practice on antitrust, trade defense, and general EU law matters including litigation in the EU Courts. Leonidas represents clients on abuse of dominance and cartel investigations, as well as on UK, EU, and international merger control. He also advises governments and corporations on state aid, particularly in the context of privatizations and rescues of failing banks. He is admitted to practice in New York, the EU (Greece), and is a Registered European Lawyer in England and Wales.
Prior to joining Morgan Lewis, Leonidas spent several years as an antitrust associate with a Magic Circle law firm, resident in Brussels. In 2018, Leonidas was seconded to Tata Steel – one of the world’s largest steelmakers – where he served as the organization’s in-house counsel dedicated to antitrust.
Leonidas’ practice is complemented by a strong academic profile. He was a research associate at the Committee on Capital Markets Regulation in Boston, a researcher at Harvard, and presently is a doctoral researcher in competition law at Maastricht University. He contributes frequently to leading academic and professional publications (e.g., most recently, the Oxford Journal of European Competition Law & Practice). He speaks regularly at seminars and conferences (e.g., most recently, the Law Society of England & Wales). He has received significant awards and fellowships in recognition of his academic activities, including e.g. a Fulbright Fellowship by the US Department of State, and was selected to deliver the 2013 Commencement Speech at Harvard Law School.
Amdipharm Mercury on its defence against a Statement of Objections (SO) by the UK Competition and Markets Authority (CMA) regarding an alleged pay-for-delay arrangement with respect to adrenal insufficiency drug Hydrocortisone
Concordia on its defence against the CMA’s SO and Supplementary SO in relation to alleged unfair and excessive pricing of thyroid drug Liothyronine
Focus Pharma on its defence against the CMA’s SO in relation to an alleged market exclusion arrangement in respect of anti-nausea drug Prochlorperazine
Advanz on its defence against the CMA’s alleged market sharing arrangement in respect of antibiotic Nitrofurantoin
A global manufacturing corporation on (i) its internal investigation of suspected antitrust violations; (ii) its application for immunity or leniency to antitrust enforcement agencies; and (iii) designing and implementing its organisation-wide compliance programme
A global electronics corporation in a major cartel investigation involving immunity applications in respect of various products
Yandex on (i) the $3.725 billion combination of the ridesharing businesses of Yandex and Uber in Russia and neighbouring countries; and (ii) Sberbank’s $500 million investment in Yandex’s shopping comparison platform Yandex.Market
Tata Steel on merger control aspects of various transactions
Abbott Laboratories on its $2.9 billion acquisition of CFR Pharmaceuticals
Pfizer on global merger control aspects of various multibillion transactions
The Carlyle Group on the acquisition of a 36.8% stake from General Electric in Hong Kong listed satellite operator AsiaSat for up to $483 million
Citigroup in relation to a Phase II merger control investigation into the sale of Citigroup’s retail network in Greece to Alpha Bank
Hellenic Petroleum and the Greek Privatization Agency in relation to the European Commission’s Phase II investigation into the proposed acquisition of the Greek Gas Transmission System Operator DESFA by SOCAR
A major games of chance operator in relation to a Phase II merger control investigation into the acquisition of exclusive rights to operate horse-racing betting
A major investment management company on the acquisition of stakes in a number of Europe’s leading games of chance operators (including Casinos Austria and the Czech lottery company Sazka)
State Aid Control & EU Litigation
Successfully represented a leading operator of games of chance in a number of proceedings before the General Court and the Court of Justice of the European Union (including in T-416/13, Stanleybet v. Commission; T-57/13 and T-58/13, Casino Loutraki, others v. Commission; and subsequent appellate proceedings in C-131/15)
A Member State’s privatization agency on state aid control aspects of a number of landmark privatizations, including (i) the extension of the concession for the operation of the country’s largest airport for €1.1 billion; and (ii) the contemplated divestment of the majority of shares in the country’s natural gas transmission incumbent
Successfully defended Citadele Bank on an in-depth investigation launched by the European Commission concerning allegedly illegal state aid
A international conglomerate on two state aid investigations into allegedly unlawful infrastructure aid
Spanish, Dutch, and Greek banks which benefitted from state aid on negotiating, implementing and/or amending their restructuring plans in line with EU state aid control rules
Harvard Law School, 2013, LL.M., Fulbright Fellow, US Department of State
University of Cambridge, Trinity Hall, 2012, LL.M.
Aristotle University of Thessaloniki, Greece, 2011, LL.B.
England and Wales (REL)
Greece: Courts of Appeal
General Court and Court of Justice of the European Union
Awards and Affiliations
Member, Practice Group of the Year, Competition, Law360 (2017–2019)
Member, Law Society of England and Wales (Competition Section)
Member, International Trade and Customs Law Committee, International Bar Association