S tefan Quandt is a German billionaire heir and industrialist who, along with his older sister Susanne Klatten, is a major shareholder in the luxury automaker BMW. He is the son of the late Herbert Quandt, the legendary industrialist who is credited with saving BMW from bankruptcy in 1959 and building it into a global powerhouse. Upon his father's death, Stefan inherited a substantial stake in the company, which has since grown in value to form the bedrock of his immense fortune.

Quandt holds a 23.6% stake in BMW and serves as the deputy chairman of its supervisory board, where he plays a key role in the company's long-term strategic decisions. In addition to his BMW inheritance, he manages a portfolio of other businesses through his private holding company, Delton AG, which has interests in logistics (Logwin) and homeopathic medicine (Heel). He and his sister are the most powerful shareholders at BMW, and their family is one of the wealthiest and most influential in Germany, a status that has also brought scrutiny regarding their family's activities during the Nazi era.