D iamantis Diamantides is a Greek self-made billionaire and a major, albeit highly discreet, player in the global shipping industry. He is the founder of two major shipping companies: Delta Tankers, which operates a fleet of crude oil and product tankers, and Marmaras Navigation, which focuses on dry bulk carriers. He has built his empire from the ground up.

Diamantides is known for his astute and often contrarian approach to the notoriously cyclical shipping market, buying and selling vessels at opportune times. He has built a modern and efficient fleet, making his companies highly respected in the maritime world. Like many traditional Greek shipowners, he is intensely private and avoids the media spotlight, preferring to manage his vast shipping interests out of the public eye. His family is now involved in the business, continuing the legacy he created.