The majority of Wertheimer's fortune is derived from Chanel, the fashion and fragrance company he controls with his brother, Gerard. Alain and Gerard are assumed to each own half of Chanel in this analysis.

Chanel had net revenue of $17.2 billion in 2022, according to financials released by the company in June 2023. It's valued using the average enterprise value-to-sales and enterprise value-to-Ebitda multiples of five publicly traded peer companies: L'Oreal, Estee Lauder, Prada, LVMH and Kering. The valuation was updated on June 27, 2023 to reflect the latest results and this led to a rise of about $4 billion.

The brothers own almost a 1% stake in publicly traded US beauty store company Ulta Beauty and a 5.8% stake in haircare business Olaplex through their family office Mousse Partners and affiliated investment firms. They also own a French and US racehorse business, which is valued based on a calculation by a thoroughbred horse consultant who asked not be identified because the company is closely held.

A spokesman for Chanel declined to comment on the Wertheimer family's fortune.

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