D avid Reuben, along with his younger brother Simon, forms one of the wealthiest and most powerful business partnerships in the United Kingdom. The Reuben brothers are self-made billionaires who built a colossal fortune first in metals trading and then in real estate. Born in Bombay, India, to an Iraqi-Jewish family, they moved to London as teenagers and began their careers in business, David in scrap metals and Simon in carpets.

In the 1990s, they became dominant players in the Russian aluminum market during the chaotic post-Soviet era, a period known as the 'aluminum wars'. They later sold their Russian assets and pivoted their focus to real estate, building a massive and highly valuable portfolio of properties in London and around the world. Their holdings include prime office buildings, retail spaces, hotels, and data centers. They are known for their deep privacy and their ability to execute large and complex deals.