A ristotelis Mistakidis, often known as "Telis," is a commodities trading tycoon who made his fortune during a long and storied career at Glencore, the world's largest commodities trader. Born in Greece and raised in the UK, Mistakidis joined Marc Rich & Co. in 1993, the company that would later become Glencore. He rose through the ranks to become the head of its copper trading department, one of the company's most important and profitable divisions.

Mistakidis became known as the "king of copper" for his dominant and influential role in the global copper market. He became a billionaire following Glencore's massive IPO in 2011, which made many of its top partners incredibly wealthy. His tenure at Glencore ended in 2018 when he retired amidst regulatory scrutiny of the company's copper mining operations in the Democratic Republic of Congo. Since leaving Glencore, he has invested in other ventures, including a significant stake in a Greek bank.