Peltier Juvigny Marpeau & Associés > Paris, France > Firm Profile

Peltier Juvigny Marpeau & Associés
75002 PARIS

France > EU, competition and distribution Tier 2

Merger control is a significant strong suit of the EU and competition practice at Peltier Juvigny Marpeau & Associés, which has an impressive record of involvement in complex cases before the European Commission – including recently advising Vivendi on its takeover of Lagardère – in addition to handling a high volume of merger control proceedings before the FCA. The team is also well versed in antitrust litigation at both the national and European levels, and has represented clients in a growing number of follow-on damages claims. At the head of the practice, Thibault Reymond and Ning-Ly Seng are skilled in both contentious and non-contentious competition matters.

Practice head(s):

Thibault Reymond; Ning-Ly Seng


‘Very responsive and keep in close contact with their clients.’

‘Ning-Ly Seng builds close relationships with clients and has complete mastery of her subject. She has a very business-oriented approach and keeps the client’s requirements in mind.’

‘PJM has one of the very best competition practices in Paris and the continent. They are client focused and very knowledgeable about the relevant industries and governmental authorities. PJM’s competition practice provides extraordinary solutions with global, top-notch expertise paired with the advantages of a boutique such as direct attention from the top partners.’

‘Ning-Ly Seng is a superb lawyer, with unparalleled and extensive knowledge of competition law and related regulatory issues in Europe. Even more impressive is her client-focused approach: she understands her clients’ businesses and is highly responsive to their requirements. She solves difficult problems effectively and elegantly and makes it all look so much easier than it really is.’

‘Thibault Reymond stands out for his rapid and cross-disciplinary understanding of the client’s issues.’

Key clients

Casino (including Monoprix and C-Discount)





Boehringer Ingelhiem




Compagnie des Alpes

Abeille Assurances










Work highlights

  • Advised Vivendi on its strategic takeover bid over Lagardère, which was approved by the European Commission following a phase II procedure.
  • Represented Casino in proceedings before the European Court of Justice seeking to annul the decision of the European Commission to authorise dawn raids on the client’s premises.
  • Assisting Bolloré SE with obtaining approval from the European Commission for its strategic sale of Bolloré Logistics to CMA CGM.

France > Dispute resolution: Stock market litigation Tier 3

Peltier Juvigny Marpeau & Associés assists asset management firms as well as individuals and a leading accounting firm in dealing with AMF securities breach investigations, including financial communication issues and insider dealing accusations. The team also acts in shareholders’ conflicts and public M&A-related cases. The highly experienced Frédéric Peltier and Clément Wierre are the practice heads.

Practice head(s):

Frédéric Peltier; Clément Wierre

Key clients

FAJR (Frédéric Abitbol/Joanna Rousselet)

Jekiti Mar Capital



Work highlights

  • Representing Altamir, a listed private equity investor, in the context of several litigation proceedings against Moneta Asset Management, one of its main minority shareholders, following a memo published on Moneta’s website.
  • Assisting Cira in the definition of its shareholders’ activism strategy in the company CS Group.

France > Employment Tier 3

Distinguished for its industry expertise in the financial sector, Peltier Juvigny Marpeau & Associés advises major banks and investment funds. Other areas of strength include sensitive termination cases and related litigation. Aurelie Fournier leads the team and leads on complex litigation, whistleblowing procedures and corporate reorganisations. She is supported by François Troadec, who focuses on reorganisation plans and trade union issues.

Practice head(s):

Aurélie Fournier

Other key lawyers:

François Troadec


‘The team is innovative, particularly with regard to the document sharing cloud.’

‘Aurélie Fournier particularly stands out.’

‘Discussions are always constructive and these experienced lawyers take our operational needs into account and support us in finding secure solutions.’

‘They can call on other lawyers on subjects for which we need expertise other than that of social law (tax law) and this is also the strength of this firm.’

‘The team is very responsive and close to its customers’ issues. The advice is fine, precise and above all very concrete. The strategies are thought out and well anticipated.’

‘François Troadec, very competent, proactive and a fine strategist’

Key clients

BNP Paribas


Financière Gérard Joulie

Sphere SA

Moet-Hennessy – Louis Vuitton


BNP Paribas Lease Group

BNP Paribas Personal Finance


Séché Environnement

Work highlights

  • Acted for BNP Paribas in a high-end lawsuit against an employee who challenges his dismissal in the context of a claim of discrimination in consideration of his racial origins.
  • Advised Dometvie on labor and employment matters in the context of a Recovery Plan “Plan de sauvegarde”.
  • Represented BNP Paribas Lease Group in a litigation against a trade Union (CFDT) relating to the compensation of mobile working during the Covid-19 crisis.

France > Insolvency Tier 3

Peltier Juvigny Marpeau & Associés houses a robust insolvency practice, successfully managing small to mid-sized mandates spanning diverse industries such as food, clothing, power, books, aeronautics, and transportation. Under the guidance of Nicolas Partouche, the firm offers strategic counsel to companies navigating pre-insolvency and insolvency proceedings, assisting in the development of recovery plans, and supporting insolvency practitioners in complex cases and litigation, including asset recovery and debt liability. Julie Cavelier further strengthens the practice, providing guidance to clients in both amicable and judicial insolvency proceedings, having been appointed to counsel in February 2023.

Practice head(s):

Nicolas Partouche

Other key lawyers:


‘A very structured and organised firm.’

‘A coherent, united and very competent team.’

‘An excellent cocktail of know-how, efficiency and availability.’

Key clients

Dometvie Group

Groupe Monoprix

Miquel Aras & Associes (Michaël Aras) and SELARL Yvon Perin et Jean-Philippe Borkowiak (Yvon Perin) – for Camaïeu

Ello Managers



Mr. Thierry Gloriès

B. Gnecchi

SELARL Asteren

MJS Partners

Alain-François Souchon

Work highlights

  • Advised Dometvie Group, specialised in home improvements for people with reduced mobility, in the opening of safeguard proceedings and the adoption of a recovery plan.
  • Advised Monoprix Group, which is the exclusive supplier of the Getir group for the monoprix brands, with its commercial relations with the Getir Group (Getir France, Gorillas Technologies France and Frichti) in the context of their insolvency proceedings.
  • Advised the Judicial Liquidators in the context of the insolvency proceedings of Camaieu to safeguard employees’ rights relating to the portability of health and provident cover, which were suspended by AG2R Preovyance following their redundancies for economic reason.

France > Dispute resolution: Commercial litigation Tier 4

Practice head(s):

Frédéric Peltier; Clément Wierre

Other key lawyers:


‘An extremely involved and creative team with a very high level of expertise. Fine strategist and a very pragmatic approach.’

‘A very high level of technical expertise on cases with high financial stakes. Its lawyers are capable of delivering excellent quality service, worthy of the best firms in the area.’

‘Clément Wierre is one of the most talented litigators of his generation. A fine connoisseur of the courts, he knows how to get the best legal advantage out of complex situations.’

‘A dynamic, responsive, proactive, attentive team, undoubtedly demonstrating expertise in their field.’

‘Clément Wierre is extremely proactive, very business-oriented, efficient and available with real expertise in his subjects.’

Key clients


MJA (Mandataires judiciaires Associés)

FAJR (Frédéric Abitbol/Joanna Rousselet)

Intermediate Capital Group (ICG)

Apax Partners

Concorde Finance





Trimax Développement

Groupe Duval



Andrea Partners

Corsica Sole


Safti Immobilier

France > Mergers and acquisitions Tier 4

Practice head(s):

Benoit Marpeau

Other key lawyers:


 ‘Benoit Marpeau: very high technique, inventive, an outstanding negotiator and very friendly. He is very responsive and counts among the very best in Paris.’

‘Deep expertise and client-centric approach. Their strengths include speed, efficiency, and a high level of ethical conduct.’

‘Benoit Marpeau is a standout lawyer. His attention to detail and deep understanding of M&A law make him an invaluable asset. He has exceptional client engagement skills; he takes the time to understand the client’s needs and tailors his approach accordingly. Additionally, his ability to simplify complex legal issues into understandable terms is unparalleled, making the legal process more accessible for clients. Benoit’s proactive communication and transparency in billing also contribute to a seamless and trustworthy client experience.’

‘Very experienced and responsive team.’

‘Benoit Marpeau has great intelligence of situations and finds the most pragmatic solutions with great responsiveness and technical expertise.’

‘Very high technical level. Capacity for innovation and adaptation.’

‘High business sense.’

‘Benoit Marpeau: strong business sense and excellent negotiation skills. High technical level.’

Key clients



Séché Environnement

Casino Group


Groupe Avril

Rivalen Sas

Impala (holding Jacques Veyrat)

Icape Group




Content Square


Lov Group

Casavo Management S.P.a

Work highlights

  • Advised Casino group on the sale of 119 stores to Intermarché.
  • Advised LVMH in connection with the acquisition of a majority stake in Platinum Invest F.
  • Advised Avril on the acquisition of Axereal Elevage.

The firm: Dethomas Peltier Juvigny & Associés is an independent law firm created in 2013 by Arthur Dethomas, Frédéric Peltier, Olivier de Juvigny and Thibault Reymond, experienced partners from the best French and international firms.

The firm is dedicated to M&A transactions and to the resolution of complex matters. We advise our clients in strategic matters, essentially related to M&A and joint-ventures, competition and merger control, governance, shareholders’ disputes, and equity financing.

In 2015, Benoit Marpeau joined Dethomas Peltier Juvigny & Associés to reinforce the M&A practice. End of 2016, Ning-Ly Seng, who started her career in 2004 at Bredin Prat and became counsel in 2015, joined the firm to strengthen the competition practice. She was elected to partnership in 2018.

Areas of practice
M&A/corporate finance: This practice is at the heart of our corporate team¡¦s activities, including acquisitions or capital increases involving public or private companies, and private equity transactions. Our practice deals with all matters encountered by companies, whether they concern governance, disputes between shareholders or between companies and their managers. We advise issuers, shareholders and management on regulatory issues specific to listed companies, notably for the preparation of complex general shareholders meetings. Our practice also acts in matters before the French Financial Markets Authority (“Autorite des Marches Financiers”) or criminal courts.

Merger control and antitrust/competition: Competition law has become a cornerstone in the strategy of companies; our firm dedicates to merger control and antitrust/competition issues three partners who are involved on a regular basis in major or legally challenging cases. Our antitrust/competition partners have high-standard reputation in French and European merger control, they assist clients in antitrust/competition litigations before French and European competition authorities and jurisdictions. Our practice also includes private enforcement cases and restrictive and unfair competition practices.

Litigation and arbitration: Our lawyers defend their clients’ interests in strategic corporate disputes. Their expertise is well recognized in the practice of company law, shareholder and governance disputes, as well as in stock exchange, financial and anti-competitive behavior litigation.

White-collar criminal law and proceedings before regulatory authorities: With its combined understanding of criminal procedure and knowledge of the business and financial world, our firm provides counsel to clients in economic and financial criminal law matters, particularly in cases of violation of stock exchange and competition regulations. The lawyers of our firm have a highly regarded practice in defense before the French Financial Markets Authority and the French and European Competition Authorities.

Under the responsibility of our co-head of the Antitrust Department, Ning-Ly Seng, the firm is involved in many diversity programs. Indeed, Ning-Ly is an active member of the Club 21è Siècle and has just been asked to join the Bureau as Projects Manager (as such, she coordinates all the projects of the Club and those in partnership with the Club).

For instance, the firm partners with ViensVoirMonTaf and welcomes each year between 2 and 3 high school students from underprivileged neighbourhoods to carry out their compulsory discovery internship.

Ning-Ly is or has been also part of several mentoring programs:

  • Revel@Her promoting women from diverse backgrounds (four double portraits were published in Les Echos Start, among which the duo formed by Ning-Ly and her mentee1),
  • the mentoring program of W@CompetitionFR with 16 other antitrust professionals (including the former President of the French Competition Authority), mentoring youngest competition practitioners,
  • Article 1, supporting during one full year a young student from underprivileged backgrounds by means of professional tutoring,
  • HEC Incubator, supporting women entrepreneurs from diverse background to enter into HEC Incubator program (a tailored and participative start-up support program, in partnership with Station F, one of the biggest European start-up campus).

The firm fiercely encourages the associates to participate and/or benefit from mentoring programs.