Didier Chabassieu chairs the Management Board of HighCo. He shares the Group’s values of innovation, passion, respect and performance, driven with the ambition to make HighCo the leader on its markets.

Fascinated by the development of digital and new technologies, Didier Chabassieu joined HighCo when it was founded in 1990 after completing a graduate degree in finance. In 1993, he organised the first investor fund-raising operation. He became Chief Financial Officer and a member of the Management Board in 1996 and oversaw HighCo’s IPO.

Since 2000, Didier Chabassieu has been in charge of the Group’s mergers and acquisitions, leading about 30 acquisitions in 10 European countries. He floated a subsidiary on the German market and led the investment in the Group’s minority stakes in the internet start-ups Mediastay (2000), Digitick (2007), Rue du commerce, and so on.

Didier Chabassieu was appointed Managing Director in 2002 and Chairman of the Management Board in 2013.

Shareholding: Didier Chabassieu owns 394, 159 HighCo shares, or 1.93% of the share capital, as at 1 March 2026.

Other current terms of office and positions held outside the Group: None.

Other terms of office and positions held over the past five years and expired: TheCamp (SAS) – Director.

Expiry of term of office: 15 December 2025

Age: 57

Nationality: French.

Professional address: HighCo – 365, avenue Archimède, CS 60346 – 13799 Aix-en-Provence Cedex 3, France.

Cécile Collina-Hue graduated from Paris Dauphine University where she completed her post-graduate degree in corporate finance.

She began her career with DCI group in 1995, working in management control and treasury management.

Joining HighCo in 2002, Cécile Collina-Hue has held a number of positions in administration and finance at the Group before being appointed Deputy Managing Director in 2016.

She became a member of the Management Board as Managing Director in 2017 

Cécile is also responsible for financial communication, and investor and shareholder relations.

Shareholding: Cécile Collina-Hue owns 99, 181 HighCo shares, or 0.48% of the share capital, as at 1 March 2026.

Other current terms of office and positions held outside the Group: None.

Other terms of office and positions held over the past five years and expired: None.

Expiry of term of office: 15 December 2025

Age: 53

Nationality: French.

Professional address: HighCo – 8, rue Catherine de la Rochefoucauld, 75009 Paris, France.

A graduate of Ecole Supérieure de Commerce (ESC) in Marseille and holding a DESS graduate degree from CELSA, Richard Caillat began his career in 1988 at the French television channel “La Cinq”, where he implemented its interactive policy. He joined the HighCo Group in 1991 and in 1994 became a member of the Management Board. He was appointed Co-Chairman from 2002 to 2006 before being named Chairman in 2006.  

In 2013, Richard Caillat became Chairman of the Supervisory Board.

In 2010, Richard Caillat personally produced his first theatre play, “La Mère” (The Mother). He then created Arts Live Entertainment to give the internet a key role in the production of performing arts shows. He became Chairman of the Board of Directors of the Théâtre de Paris. 

Since 20 December 2017, Richard Caillat has held a seat on the Board of Directors of Olympique de Marseille-Association, alongside other leaders including Basile Boli, Jean-Pierre Chanal (City of Marseille), Djamel Agaoua (Chief Executive Officer of Viber) and Rodolphe Saadé (Chairman and Chief Executive Officer of CMA CGM).

Date of first mandate: June 2013

Expiry of term of office: 2030 Annual General Meeting

Other directorships: See PDF file below.

Independent member: No

Member of the Audit and CSR Committee: No

Member of the Compensation and Governance Committee: No

Number of shares held: Richard Caillat owns 102, 444 HighCo shares, or 0.50% of the share capital, as at 1 March 2026.

Age: 61

Nationality: French.

Nathalie Biderman holds an MBA from INSEAD, a Master’s degree in international law from Georgetown University, a DESS graduate degree and a degree in corporate and tax law from University Panthéon-Assas (Paris II).

Nathalie began her career as a lawyer at the Paris Bar. After advising the Olympic Organising Committee in Albertville on its marketing and communication strategy, she joined the US corporate law firm Cleary, Gottlieb, Steen & Hamilton.

She advised multinational companies in their expansion and restructuring policies in Europe, focusing on the media, communication and information technology sectors.

In 1999, she moved into the internet world as part of the founding team of eDreams, the online travel website that went on to become a leader in Europe.

In 2003, Nathalie Biderman joined the international division of Havas Group before serving as COO for the Euro RSCG Worldwide PR global network.

For nearly 10 years, she advised French and international groups as well as institutions, international NGOs and political and economic figures both within and outside France in their communication strategies.

Bringing together the value of this unique experience and a vast international network built over years, in 2012 she set up the international development strategy consultancy Calya Consultants. The firm targets companies that aim to gain an international dimension, by forming strategic partnerships and investing in innovative technology solutions.

Since January 2022, she has been Of counsel to the Israeli business law firm AYR (Amar Reiter Jeanne Shochatovitch & Co) in its international development.

Nathalie Biderman is registered with the New York Bar and was named Conseiller du Commerce Extérieur de la France (French Foreign Trade Advisor) in 2020. She is also registered with the Israeli Bar as a foreign lawyer.

Date of first mandate: June 2013

Expiry of term of office: 2025 Annual General Meeting

Other directorships: See PDF file below.

Independent member: Yes

Member of the Audit and CSR Committee: Yes

Member of the Compensation and Governance Committee: Yes

Number of shares held: Nathalie Biderman owns 2 HighCo shares, or 0.01% of the share capital, as at 1 March 2026.

Age: 59

Nationality: French.

Leïla Bouguerra graduated from Neoma Business School with an undergraduate degree in business administration in 1991 and from Université Paris Dauphine with a master’s degree in control, governance and strategies in 1992.

She began her career in 1992 as an auditor with Arthur Andersen France before joining the French daily newspaper Libération as Deputy Finance Director in 1994, at the time of the launch of the new “Libé 3” format.

From 1996 to 2012, she worked for WPP and Ogilvy Paris, where she went from financial controller of the advertising agency to Chief Financial Officer of Ogilvy group in France.

At Publicis, she worked from 2013 to 2022 as CFO of Europe West DigitasLBi then Sapient, playing a role in several transformation, acquisition and integration projects at the crossroads of the communications, Agile technology and consulting sectors for a scope covering France, Italy, Spain, Netherlands and Belgium.

Leïla Bouguerra returned to WPP in 2022 as CFO of the France & Business Partner Group for Wunderman Thompson France and Velvet Consulting. In 2023, she was promoted CFO of Wunderman Thompson for the Emea region. Following WPP’s merger of Wunderman Thompson and VML Y&R, in January 2024 Leïla Bouguerra was appointed Group France CFO of VML Group companies in France, including Velvet Consulting.

Leïla Bouguerra is a hybrid CFO at the crossroads of the communications, technology and consulting sectors, acting as a strategic business partner to help build bridges and instil efficiency in perptually evolving environments and organisations. Over the course of her career, she has been a member of several boards of directors and management committees in France and elsewhere in Europe.

Date of first mandate of WPP France Holdings: January 2000 (Leïla Bouguerra, representative of WPP France Holdings, was appointed in March 2024)

Expiry of the term of office of WPP France Holdings: 2029 Annual General Meeting

Other directorships: Wunderman Thompson S.r.l. (Italy) – Member of the Board of Directors.

Independent member: No

Member of the Audit and CSR Committee: No

Member of the Compensation and Governance Committee: Yes

Number of shares held: Leïla Bouguerra holds no HighCo shares.

Age: 56

Nationality: French.

Currently in London, Rex Worth is Corporate Development and M&A Director at WPP (acquisitions, investments and divestments focused on digital advertising, technology and media).

Holding a Bachelor of Arts from the University of Oxford (2008-2012, Grade 2:1) and ACA qualification, he gained his solid expertise in Big 4, audit and assurance, accountancy and financial reporting at PwC (2012 to 2016) and WPP (2016 to present).

Date of first mandate of WPP 2005 Ltd: October 1999 (Rex Worth, representative of WPP 2005, was appointed on 20 August 2025)

Expiry of the term of office of WPP 2005 Ltd: 2029 Annual General Meeting

Other directorships: None

Independent member: No

Member of the Audit and CSR Committee: Yes

Member of the Compensation and Governance Committee: No

Number of shares held: Rex Worth holds no HighCo shares as of 20 August 2025.

Age: 36

Nationality: British

Cyril Tramon is the founder and Chairman of WeShareBonds, a property investment crowdfunding platform.

A graduate of the Ecole Supérieure de Commerce de Rouen (1995), Cyril began his career at EY Corporate Finance. He moved on to J.P. Morgan (London), where he worked in the Loan and High Yield Capital Markets department and then in Acquisition Finance.

In 2000, he was recruited by the French SME Consodata, European leader in marketing databases, as Head of Mergers & Acquisitions, taking on the responsibility of Financial Communication and the monitoring of companies acquired by Consodata.

After the company was sold in 2003, Cyril founded Phillimore, a private equity fund specialised in financing SMEs. He founded WeShareBonds in 2015.

Date of first mandate: August 2022

Expiry of term of office: 2030 Annual General Meeting

Other directorships: See PDF file below.

Independent member: Yes.

Member of the Audit and CSR Committee: Yes.

Member of the Compensation and Governance Committee: Yes.

Number of shares held: Cyril Tramon owns 1 HighCo share, or 0.01% of the share capital, as at 1 March 2026.

Age: 54

Nationality: French.