Law Firm

Oyat avocats Paris
Oyat avocats Paris
Oyat avocats Paris

Oyat, your business partner that puts collective intelligence at the heart of your projects.

Oyat is not just another
law firm in Paris.

Thanks to our talent pool, we know how to anticipate difficulties and advise on the most strategic projects.

Knowledge & know-how

We have chosen our areas of expertise and our strength
is to master them to better assist you.


Oyat is supported by technical and financial experts, as well as by peers in France and abroad, to provide practical, tailor-made solutions, particularly in the following areas: employment law, tax law and competition law.


Lawyers and experts specialized in employment law, our partners help us create operational solutions to support our clients’ strategies, enabling them to anticipate, optimize and secure their decision-making. They are involved in both consultancy and litigation: restructuring, individual labor relations, company management (combining mandates and employment contracts), management of the legal consequences of M&A operations, remuneration policies, employee savings schemes, employee shareholding, collective bargaining and labor relations, high-risk litigation, criminal labor litigation, international mobility and expatriation, CSR.


Our partners support our clients in managing their tax affairs, both as advisors and litigators: group restructuring (acquisitions, mergers, demergers, partial contributions of assets), management packages, equity transactions, international mobility, tax audits and litigation.


Our partners provide both advisory and litigation services, in French and European law, in the following areas: anti-competitive practices, merger control, European Union law, state aid, distribution, etc.


Skills & know-how

We are women and men of conviction, and we address
the challenges ahead by your side.
Oyat avocats - Betty Baalouchi
Betty Baalouchi
Office Manager
Oyat avocats - Ouisse Weiss Akhonzada
Ouisse Weiss Akhonzada
Oyat avocats - Louis Grohard
Louis Grohard
Oyat avocats - Romain Chinchole
Romain Chinchole
Oyat avocats - Anas Benlarbi
Anas Benlarbi
Oyat avocats - Romane Rage
Romane Rage
Oyat avocats - Elsa Lob
Elsa Lob
Oyat avocats - Claire Manouvriez
Claire Manouvriez
Oyat avocats - Émilie de Boussiers
Émilie de Boussiers
Victoria Giesbert
Lisa Ould
Oyat avocats - Charles-Henri Laval
Charles-Henri Laval
Oyat avocats - Arnaud Marroni
Arnaud Marroni
Oyat avocats - Camille Guyot
Camille Guyot
Oyat avocats - Clyde Coutellier
Clyde Coutellier
Oyat avocats - Charlotte Barraco-David
Charlotte Barraco-David
Oyat avocats - Guillaume Ledoux
Guillaume Ledoux
Oyat avocats - Laurent de la Brosse
Laurent de la Brosse
Founding Partner
Oyat avocats - Romain Canot
Romain Canot
Oyat avocats - Marie-Hélène Tonnellier
Marie-Hélène Tonnelier
Founding Partner
Oyat avocats - Caroline Basdevant-Soulié
Caroline Basdevant-Soulié
Founding Partner

From our side to yours

At Oyat, we share our understanding of the world to ensure your success.
Oyat newsletters
Press release
  • 20.06.2024 - Awards

    Marie-Hélène Tonnellier and Laurent de la Brosse are ranked once again in Best Lawyers 2025

  • 18.04.2024 - Awards

    Oyat has been recognized once again by the Palmarès des meilleurs cabinets d’avocats en France 2024, published by the magazine Le Point

  • 27.03.2024 - Awards

    Oyat is ranked by The Legal 500 EMEA 2024 in 3 categories

  • 17.03.2024 - Awards

    Marie-Hélène Tonnellier is ranked in the 2024 Chambers Guide

  • 13.03.2024 - Events

    Meet Caroline Basdevant-Soulié and Marie-Hélène Tonnellier at the IBA conference in Barcelone

  • 30.01.2024 - Awards

    Oyat has been distinguished in the Trophées du Droit 2024 rankings

  • Oyat avocats - Claire Manouvriez et Arnaud Marroni - Counsels
    15.01.2024 - Press release

    Appointment of two Counsel within the Major Projects & Ecological Transition team

  • 12.01.2024 - Awards

    Oyat has been distinguished in the Leaders League 2023 rankings

  • Oyat avocats conseille Yotta
    11.01.2024 - Deals, Press release

    Oyat advises Yotta Capital Partners, SofiOuest and AJ Invest & Consulting on the sale of Groupe Recif

  • Oyat avocats conseille iCom
    07.12.2023 - Deals, Press release

    Oyat assisted the shareholders of iCom Cloud in its sale to KPMG France

  • 18.10.2023 - Events

    Meet Caroline Basdevant-Soulié and Marie-Hélène Tonnellier at the IBA annual conference in Paris

  • Oyat avocats conseille Nomios
    29.06.2023 - Deals, Press release

    Oyat advises Nomios in the framework of the exclusive negotiations between IK Partners and Keensight Capital for the sale of Nomios

  • 22.06.2023 - Awards

    Marie-Hélène Tonnellier and Laurent de la Brosse are ranked in Best Lawyers 2024

  • 20.04.2023 - Awards

    Oyat has been recognized by the Palmarès des meilleurs cabinets d’avocats en France 2023, published by the magazine Le Point

  • 14.04.2023 - Awards

    Oyat is ranked in all its practices by the Legal 500 EMEA 2023

  • 06.04.2023 - Publications

    Cyber insurance: the French legal framework is changing

  • Oyat avocats conseille Cenexi

    Oyat advises Cenexi’s management on its acquisition by India’s Gland Pharma

  • 24.03.2023 - Awards

    Marie-Hélène Tonnellier is ranked in the 2023 Chambers Guide

  • 09.02.2023 - Publications

    The French doctrine on the use of the cloud

  • 24.01.2023 - Press release

    Oyat celebrates its first anniversary!

  • 27.12.2022 - Awards

    Oyat has been distinguished in the Leaders League 2022 rankings

  • 15.11.2022 - Press release

    Oyat appoints two Counsels: Laura Dufresne and Émilie de Boussiers

  • 20.10.2022 - Oyat newsletters

    Useful reminder to inventors

  • Oyat avocats conseille Fieldsales Solution
    01.10.2022 - Deals, Press release

    Oyat advised the managers of Activate Solutions Group Ltd on the sale of the group

  • 22.09.2022 - Awards

    Laurent de la Brosse has been recognised as a Notable Practitioner by IFLR 1000 2022 in «Project development, Real estate acquisitions»

  • Création Oyat avocats Paris
    21.09.2022 - Press release

    Oyat’s DNA in a few words, 9 months after the creation of the firm

  • Oyat avocats conseille Arcadis
    01.09.2022 - Deals, Press release

    Oyat advises Arcadis on its acquisition by DI Environnement

  • 23.06.2022 - Awards

    Marie-Hélène Tonnellier and Laurent de la Brosse are ranked in Best Lawyers 2023

  • 13.06.2022 - Events

    Marie-Hélène Tonnellier, speaker at the next IFCLA Conference, at Helsinki

  • 02.06.2022 - Oyat newsletters

    Carve out: a summary of the main objectives and interests attached to this transaction

  • 26.05.2022 - Events

    Marie-Hélène Tonnellier shall be speaker at the next Inifa conference in Paris

  • 22.04.2022 - Awards

    Oyat is ranked in the latest edition of Legal500 Paris in the “Firms to watch” category.

  • Création Oyat avocats Paris
    11.04.2022 - Press release

    Driven by an entrepreneurial passion, Oyat is an independent and pioneer law firm, and launches its visual identity and its website

  • Oyat avocats Paris - Marie-Hélène Tonnellier, Chambers 2022
    01.04.2022 - Awards

    Marie-Hélène Tonnellier is ranked in the TMT Information Technology Chambers Guide 2022

  • Oyat avocats - Cycle up
    10.03.2022 - Deals

    Oyat advises Cycle Up, Icade and Egis on the entry of 3 new shareholders : Banque des Territoires, Acorus and Groupe SMA

  • Oyat avocats - Isatis
    05.03.2022 - Deals

    OYAT advises Isatis Capital on the sale of its shares of Foederis to Group Septeo

  • Brève Oyat avocats Paris
    24.02.2022 - Oyat newsletters

    Focus on the new Guidelines on State aid for climate, environmental protection and energy

  • Brève Oyat avocats Paris
    10.02.2022 - Oyat newsletters

    Corporate Venture, what is it ?

  • Création Oyat avocats Paris
    25.01.2022 - Press release

    Creation of Oyat law firm

From your side to ours

You are convinced that “we” is stronger than “I”?
Your success will be at the center of our concerns


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