Diane Lamarche

Partner, Paris


“Diane Lamarche has great expertise, shows high availability and is very attentive to the needs of her clients. She is pragmatic, always strives to provide solutions that suit her clients, is excellent in litigation, inspires confidence… and is very nice.” “Professionalism and responsiveness.”

“Diane Lamarche frequently acts for private individuals, investment funds and corporates on commercial and shareholder disputes. One impressed market source reports: ‘She is one of the toughest opponents I have ever faced.’”
Chambers Europe 2021: Litigation, France / Legal 500 EMEA 2022: Litigation, France


Diane Lamarche is a partner in the Commercial Litigation practice of White & Case in Paris.

Diane has extensive expertise in private and public M&A litigation, with a focus in securities, commercial and corporate law. She mainly acts for major French and foreign companies before the French courts (civil, commercial and criminal) and regulators (such as the AMF). She also assists her clients before foreign jurisdictions and arbitration panels.

Diane's focus is on high-end litigation for clients operating in a wide variety of sectors such as notably private equity funds, financial institutions, industrial firms and technology companies.

Diane has also developed a notable expertise in corporate governance of listed companies. In this field, she advises corporate officers and board members and defends them when they are subject to liability and disciplinary proceedings.

In addition, Diane has a strong expertise in assisting private equity funds in the defense of their shareholders’ rights and on general corporate transactions. She also advises leading listed and non-listed companies on financial and securities transactions and on the negotiation of complex agreements.

Graduated both in finance and law, Diane trained in investment banks (within the M&A department of Lazard in London and the Equity Capital Markets department of HSBC in Paris) and in international business law firms.

Bars and Courts
Paris Bar
Graduate Diploma
Finance & Law
ESSEC Business School
Masters, Business law
Université de Paris I Pantheon Sorbonne



Representing Alec Wildenstein Jr, heir of the internationally renowned art collector family, with numerous civil, tax and criminal French proceedings in which he is involved alongside his sister Diane and uncle Guy Wildenstein, following the deaths of his grandfather Daniel in 2001 and his father Alec Sr. in 2008.

Assisting Amber Capital on the management of its minority stakes in Lagardère and the implementation of its shareholder rights since 2016.

Assisting Elliott Advisors, Amber Capital, Davidson Kempner and Farallon on various investments in French listed companies.

Assisting Deloitte in complex litigations with former partners.

Representing Hydranautics in commercial litigations with industrial partners.

Assisting Groupe Rocca in the context of several disputes.

Assisting the former directors of EPC Group against a minority shareholder.

Assisting Voodoo in the context of a litigation against former partner and competitor.

Assisting former owners and directors of Dufour Yachts in the context of post-acquisition disputes.

Assisting former shareholders of CMG Sports Club in the context of post-acquisition disputes.

Assisting a leading Financial Institution in a dispute against technology partners.

M&A / Corporate

Assisting Deloitte in connection with the sale of In Extenso and with governance issues.

Representation of Otium Capital in connection with the acquisition of Birchbox France.

Representation of Arianee, global specialist in the digital certification of valuables, in its €8 million financing round to develop its technology and digitize the fashion and luxury industry. 

Representation of several listed companies and family group in connection with governance issues.

Representation of fast-growth companies and funds in fundraisings and corporate transactions.

Awards and Recognition

Recognized as "Leading individual" by Legal 500 EMEA 2022 for Litigation and Stock-market Litigation in France

Recognized as "Up & Coming" by Chambers Global 2022 for Litigation in France

Among the 25 "Rising Stars - Europe's Best Up-and-Coming Female Lawyers" Law.com 2021

Young Leader 2020 – French China Foundation