Arthur Dethomas

Arthur Dethomas


Email [email protected]​

Phone +33 1 53 67 47 47

Fax +33 1 53 67 47 48

LanguagesEnglish, French

Practice groupLitigation, Arbitration, and Employment

"He knows his subject very well, remains calm and can push arguments in a very clever way"

Chambers 2019

Renowned for his experience in corporate, stock exchange and financial litigation and in white-collar criminal law, Arthur Dethomas is a member of the Club des Juristes (a French legal think-tank). Arthur has developed a recognized competency in complex corporate cases before the French commercial courts and represents clients before courts as well as regulatory authorities. He has been involved on numerous internal investigations and has substantial experience representing clients in cross-border matters, including insider trading, financial fraud and the Foreign Corrupt Practices Act.

According to the Chambers & Partners guide “Arthur Dethomas receives very positive commentary from clients who ‘have only positive things to say about him; he is extremely competent, very well known in the market and calm and measured in his work. He is highly experienced in shareholders’ dispute and financial liability claim” and “wins praise for his ability to design and execute strategies".

He is recommended by Legal 500 as being “the ‘precise and highly skilled” Arthur Dethomas ‘ranks among the best of his generation’ and ‘equally at ease in the courtroom as in the boardroom. In June 2019 he was named “lawyer of the year” in litigation by French magazine Option Droit & Affaires.

Arthur is licensed in Paris and in New York. He is a member of the Paris Bar Council and a former “Premier Secrétaire de la Conférence” of the Paris Bar. He teaches a class in financial regulation at Sciences-Po Paris. Prior to joining Hogan Lovells, Arthur practiced at international law firms and founded in 2013 a highly renowned litigation boutique firm. 

Arthur has a master degree in Business Law (University of Paris X) and an LL.M. from Washington College of Law (A.U.). He is fluent in French and English. A former lecturer in law at the University of Phnom Penh, Cambodia (1998-1999), he also speaks Khmer.

He teaches a class in Financial regulation at Sciences-Po Paris.

Awards and recognitions


Litigation (France)
Chambers Global


Dispute Resolution: Commercial Litigation (France)
Legal 500 EMEA


Avocat de l'année, Contentieux
Option Droit et Affaires


Recognized in Litigation (France)
Chambers Global and Europe


Stock Market Litigation and Dispute Resolution: White-Collar Crime
Legal 500

Education and admissions


Master’s degree in Business Law, University of Paris X

LL.M., Washington College of Law (A.U.)

Bar admissions and qualifications


New York

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