French citizen
Date of birth: 21 October 1976

Grégoire Castaing is a graduate of École normale supérieure Paris-Saclay, where he qualified for a professorship in economics and management, and holds a post-graduate degree in finance. He began his career with Arthur Andersen before joining Ernst & Young.

He joined the Canal+ Group in 2007 as Deputy Director of Internal Audit, and was successively promoted to Director of Financial Services, then Group Chief Financial Officer, and finally Deputy Chief Executive Officer in charge of Finance and Strategy and member of the Executive Board.

On 3 June 2024 he was named Deputy Chief Executive Officer of the Lagardère group in charge of Finance and joined the Executive Committee of the Lagardère group on the same date.

In the context of the partial demerger of Vivendi, and as proposed by Chief Executive Officer Jean-Christophe Thiery, Grégoire Castaing was appointed Deputy Chief Executive Officer of Louis Hachette Group on 22 October 2024.

In 2025, he was appointed as a director of Hachette Livre and Lagardère Paris Racing Ressources, and Chairman of Lagardère North America.

Positions held in other companies

In France:

• Deputy Chief Executive Officer in charge of Finance, Lagardère SA⁽¹⁾
• Director, Dailymotion SA
• Director and founders’ representative, Canal+ Corporate Foundation
• Director, Hachette Livre
• Director, Lagardère Paris Racing Ressources

Outside France:

Chairman, Lagardère North America (United States)

¹ Company listed on a regulated market.