Billionaire Profile
Segolene Gallienne
Global Rank
#1210

Image: Public domain | via Wikimedia Commons

Segolene Gallienne

CEO, U.S. Steel
BE
Real-Time Net Worth
$3.32B
As of December 2025
Age
48
Source
Steel, Investments
Industry
manufacturing
Citizenship
BE

Biography

Ségolène Gallienne, a 48-year-old Belgian citizen, has built a significant fortune through steel and investments. Her net worth is approximately $3.3 billion. A director of various French and international companies, including Christian Dior and Groupe Bruxelles Lambert (GBL), she is also the Chairwoman of the Board of Directors of Diane S.A., a company specializing in the art trade. Her career has seen her in high-profile communication roles, including Head of Public Relations at Proximus (formerly Belgacom) and Head of Communications at Dior Fine Jewelry. She is a shareholder in GBL, and her husband, Ian Gallienne, is a co-CEO of GBL, a company with assets exceeding $10 billion.

Wealth Over Time

In-Depth Profile

Early Life

Ségolène Gallienne, born in France, is the daughter of the late Albert Frère, a prominent Belgian billionaire industrialist who passed away in 2018. Her father transformed his family's scrap-metal business into a vast empire spanning media, utilities, and oil. Growing up, she was immersed in the world of high finance, observing her father's strategic moves and business acumen.

Rise to Success

While not actively involved in managing her family's holding company initially, Gallienne's influence grew over time. Her husband, Ian Gallienne, took a more active role, becoming the CEO of GBL. In 2002, she met Ian Gallienne, and together, they form one of the most influential couples in Belgium, with a combined wealth estimated at over €2.9 billion (approximately $3.1 Billion USD) as of February 13, 2025. She has been a member of the board of directors of Groupe Bruxelles Lambert since 2015, and is a member of its standing committee.

Key Business Strategies

Her career shows the skills and experience needed to succeed in business and finance. Gallienne is on the board of various companies, including Christian Dior SE since 2010. She also serves as Chairwoman of Diane SA's board of directors, which specializes in the art trade. Her experience in communications and public relations, particularly at Proximus and Dior Fine Jewelry, has equipped her with valuable skills for managing relationships and conveying key messages.

Philanthropy

No specific philanthropic amounts were found in the search results.

Career Milestones

2000

Head of Public Relations

Proximus (formerly Belgacom)

2001

Head of Communications

Dior Fine Jewelry

2008

Chairwoman of the Board of Directors

Diane SA

2010

Director

Christian Dior SE

2015

Non-Executive Director

Groupe Bruxelles Lambert

2024

Director

Power Corp. of Canada

Philanthropy & Social Impact

N/A

Unknown

Undisclosed

No specific information on philanthropy found