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According to the Bloomberg Billionaires Index, Len Blavatnik is the 20th-33rd richest person in the world. He has an estimated net worth of $19.7 billion as of April 2023. Blavatnik is a Ukrainian-born American businessman who made his fortune in the natural resources industry. He is the founder and chairman of Access Industries, a private investment firm with interests in energy, metals, telecommunications, and real estate.