Along with her three children, socialite and philanthropist Julia Koch bagged a 42% stake in Koch Industries upon the death in 2019 of her husband David, who was instrumental in turning the privately held conglomerate into the enormous success it is today.

At the time of David's death, the holding had a value of $50.5 billion (£38.1bn), making it officially the biggest single inheritance of all time.

The fortune derives from the share in the company David inherited in 1967 from his own father, Fred. Back then, the stake was worth just $7 million – around $65 million (£49.1m) in today's money – which goes to show just how successful Koch Industries has been over the years.

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