Economic law

Competition law
Distribution law
Consumer law


Business transfers and company mergers
Capital transactions
Corporate law

Energy, energy efficiency and environmental law

Energy law
Energy saving certificates
Environmental law

Social and solidarity economy law

Legal and tax restructuring
Structuring and setting up governance and business
Growth, development and cooperation

Intellectual property law

Trademark, patent, design and model
Portfolio management

New technologies and IT law

IT contracts
Internet and digital law

Labour and social security law

Labour law
Social Security and Social Protection law

Tax law

Corporate taxation
Asset taxation
Taxation of foundations and sponsorship


François Loubières
Flore Mazas
Daniel Petard
Marie-Sylvaine Capin-Sizaire
Natacha d'Arnoux de Flery
Florence Saint Olive
Sabrina Chaou
Léna Tiano


27 rue Marbeuf 75008 PARIS
+33 (0) 1 81 80 42 50 -

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François Loubières


A founding partner of Swann Avocats since 2012, François is a graduate of the Universities of Paris I and Montpellier I. François advises on economic law (competition, distribution, consumer affairs), energy and energy efficiency law (energy saving certificates). François started his career at Vogel & Vogel in the field of competition law (1999-2008) before becoming General Counsel and member of the Executive Committee of Primagaz (2008-2012). François is highly responsive and familiar with the concerns, the functioning and the expectations of his clients. He provides tailor-made services based on a pragmatic and direct approach.
+33 (0) 1 81 80 42 51
+33 (0) 6 07 41 28 93


Flore Mazas


Flore is a founding partner of Swann Avocats and advises on economic law (distribution, consumer affairs, competition) and energy and energy efficiency law. She holds a Master II degree in European law and was admitted to the Paris Bar in 1998. She practised with the law firms Vogel & Vogel and PriceWaterHouseCoopers before founding the firm. Highly responsive and attentive to her clients, Flore provides services with a pragmatic and solution-oriented approach.

Date of swearing in : 01/07/1998
+33 (0) 1 81 80 42 52
+33 (0) 6 83 44 97 23


Daniel Petard


A founding partner of Swann Avocats, Daniel is a graduate of the Universities of Paris V and Paris I. Daniel is involved in corporate matters (equity transactions, business transfers, governance), as well as in the social and solidarity economy (social housing, medico-social sector, support). As a former member of an international law firm, Daniel has the ability to grasp complex issues, combining different professions and areas of expertise, to be at the forefront of project management. Daniel provides close support to managers and shareholders in their high-stakes projects.

Date of swearing in : 26/05/1999
+33 (0) 1 81 80 42 53
+33 (0) 6 12 44 45 98


Marie-Sylvaine Capin-Sizaire


After a university education and a first experience in business law, Marie-Sylvaine has been advising companies for more than 25 years on all labour law issues. Focused on individual and collective litigation, she also advises mainly on reorganisation operations (collective mutually agreed terminations, voluntary departure plans, employment protection plans, etc.) and mergers and acquisitions, as well as on the management of psycho-social risks. Reactive and involved, Marie-Sylvaine is known for her pragmatism and her global vision of cases.

Date of swearing in : 21/03/1994
+33 (0) 1 81 80 42 80
+33 (0) 6 45 51 81 51


Natacha d'Arnoux de Flery


Natacha joined Swann Avocats in 2014 and advises on corporate matters (equity transactions, business transfers, governance, social secretariat) as well as on social and solidarity economy matters (social housing, medico-social sector, support). Natacha has also developed expertise in commercial litigation. Natacha holds a Master I in Business Law and a Master II in Contract Law and Commercial Practices. With her solid experience and pragmatic approach, Natacha knows how to offer her clients adapted and effective solutions.

Date of swearing in : 15/01/2015
+33 (0) 1 81 80 42 55

d'Arnoux de Flery

Florence Saint Olive


Florence joined Swann Avocats in 2019. Florence is a graduate of the University of Paris V and is focused on competition, distribution and consumer law matters, particularly in the drafting and negotiation of business contracts and general terms and conditions of sale (B2B and B2C), as well as on management of pre-litigation and litigation files between business partners. Her experience in general and business law firms, as well as her legal training in the USA have enabled her to develop a pragmatic and proactive approach.

Date of swearing in : 09/03/2000
+33 (0) 1 81 80 42 54
+33 (0) 7 81 89 78 41

Saint Olive

Sabrina Chaou


Sabrina joined Swann Avocats in 2021 after working in business law firms and legal departments. Sabrina holds a Master 2 in private law and an MBA in business law. She advises on corporate law and on the social and solidarity economy.

Date of swearing in : 11/05/2021
+33 (0) 1 81 80 42 57


Léna Tiano


Léna joined Swann Avocats in 2023 after several experiences in law firms and legal departments. Léna holds a master’s degree in International and European Litigation from the University of Paris Nanterre and an LLM in Fashion Law from the University of Luiss Guido Carli in Italy. She advises and litigates in all areas of business law, including competition law, distribution law and consumer law. She is fluent in English.

Date of swearing in : 26/01/2023
+33(0)1 81 80 42 56