Ségolène Gallienne is a French businesswoman, the billionaire heir and Co-owner of Bouygues S.A. (Euronext: EN), a massive multinational conglomerate spanning construction, real estate, media (TF1), and telecommunications (Bouygues Telecom). Her wealth is generational, tied to the industrial empire founded by her late father, Francis Bouygues, in 1952.

Gallienne's career is defined by generational stewardship and fiduciary oversight of the complex family assets. She holds a significant stake in the company, ensuring the long-term private control of the French industrial giant (along with her brothers, Martin and Olivier Bouygues).

• Bouygues S.A. (Family Heir & Shareholder): The core publicly traded asset, a major multinational conglomerate spanning construction, real estate, media (TF1), and telecom (Bouygues Telecom).
• Industrial Focus: Her fortune is tied to the long-term, stable profitability of the construction, telecom, and media sectors.
• Family Governance: She is one of the three major heirs who maintain the family's controlling interest in the publicly traded company.
• Investment Strategy: Her philosophy is rooted in long-term asset hold and conservative financial management of essential French industrial assets.

Ségolène Gallienne's structural role is centered on fiduciary stewardship of her inherited assets, ensuring the long-term, stable management of the Bouygues S.A. legacy. The company's strategic genius lies in its commitment to vertical integration and technological diversification (into telecom and media). Her structural contribution is essential to providing foundational stability to one of France's largest industrial groups.

She is based in France and manages her family's stake within the highly stable Bouygues family holding structure. Her wealth is secured by the colossal, long-term, stable profitability of the global construction, telecom, and media sectors.

Ségolène Gallienne's social impact stems from Bouygues S.A.'s role as a massive employer and provider of essential infrastructure, media, and telecom services in France and globally. Her family's foundation supports various educational and community initiatives, continuing the multi-generational commitment to corporate social responsibility.

Her personal philanthropy supports various community and educational initiatives.

Ségolène Gallienne maintains the discreet, professional style of a corporate heir. Her attire is professional and high-quality, favoring classic French business wear. Her aesthetic reflects stability and quiet, established authority, typical of a highly private French billionaire.

Residing in Paris, France, her luxury is the immense security and financial reward derived from her multi-billion euro fortune. Her life is dedicated to financial stewardship, investment strategy, and the long-term legacy of the Bouygues empire.