Dona Bertarelli Net Worth

Dona Bertarelli has an estimated net worth of $7.4 billion, according to Forbes Real-Time Billionaires, Dona Bertarelli profile (figures as of October 20, 2026). That is up from $4.7 billion in 2019.

Dona Bertarelli is a Swiss entrepreneur, investor, sailor, and ocean advocate. She worked in the family biotech company Serono in the 1990s as executive director of public and professional affairs. During that time, she helped launch the Serono Symposia and the Serono Foundation. She later became known beyond business through sailing wins with Spindrift Racing and through ocean work as co-chair of the Bertarelli Foundation and founder of Sails of Change.

Her wealth is tied mainly to Serono, the biotech business built by her family. Forbes says the bulk of her fortune comes from the 2007 sale of Serono for over $13 billion. She and her brother Ernesto split ownership of most family assets. Bertarelli also owns the Park Gstaad hotel, Five Seas Hotel in Cannes, and Country Club Geneva. In 2026, Forbes put her net worth at $7.4 billion on its real-time tracker.

How Dona Bertarelli makes money

Most of Bertarelli's money traces back to biotechnology. She was active in Serono and held a senior public affairs role from 1992 to 1997. The company was sold in 2007, and Forbes says that deal, worth over $13 billion, is the main source of her wealth. Her fortune is also connected to shared family holdings, since she and her brother Ernesto divide ownership of most family assets.

Her business interests go beyond biotech. Forbes notes that she owns the Park Gstaad hotel, Five Seas Hotel in Cannes, and Country Club Geneva. Other projects in the public record include buying Fiorucci in 2022 and partnering on the Amancaya resort project in 2025. Alongside business, she spends much of her time on marine conservation and serves as a special adviser to the United Nations.

Forbes net worth over time

Forbes valued Bertarelli at $4.7 billion in 2019, then $4.3 billion in 2020. The estimate moved back to $5 billion in 2023 and reached $6.2 billion in 2024. Those swings still point to the same core story: her wealth is anchored in the Serono sale and in family investments that stretch across several sectors, including hospitality and other assets.

By 2026, Forbes ranked her at $7.5 billion on its World's Billionaires List, while the real-time tracker showed $7.4 billion in October 2026. Forbes still ties most of that fortune to the Serono deal, not to salary or one new venture. Her public work has centered on ocean causes, but the money behind her profile remains rooted in biotech and long-held family investments.