The 2015 list highlighted a concentration of wealth in technology, telecom, and finance, with many top fortunes tied to publicly traded companies and family controlled conglomerates. Amancio Ortega of Inditex, Larry Ellison of Oracle, and Charles Koch and David Koch of Koch Industries also appeared among the top ten, reflecting sectors such as retail, software, and energy Forbes.
Top Billionaires by Net Worth in 2015
Bill Gates, Carlos Slim, and Warren Buffett
Bill Gates remained the richest person in 2015 because Microsoft continued to generate strong revenue from Windows, Office, and enterprise services, and his diversified investments through Cascade Investment added to his fortune Forbes. Carlos Slim Helu benefited from dominant positions in Mexican telecom and infrastructure, while Warren Buffett grew his wealth through Berkshire Hathaway acquisitions and equity holdings in major American companies Forbes.
Other notable entries included Amancio Ortega, founder of Zara parent Inditex, whose retail model drove consistent growth, and Larry Ellison, co founder of Oracle, whose software and cloud businesses supported a multibillion dollar net worth. Charles and David Koch ranked highly due to their ownership of Koch Industries, a large privately held conglomerate active in refining, chemicals, and pipelines Forbes.
Companies and Sectors Behind the Richest Fortunes
Technology, Telecom, and Energy
Technology was a key driver of wealth in 2015, with Microsoft and Oracle creating fortunes for Bill Gates and Larry Ellison, while telecom companies such as América Móvil fueled Carlos Slim Helu's wealth Forbes. Energy and industrial sectors also featured prominently, with Koch Industries and other firms linked to oil refining, chemicals, and infrastructure contributing to the top rankings Forbes.
Many of the richest people in 2015 built their fortunes through long term ownership of large companies, often with family or closely held structures that allowed control without full public disclosure of every asset. Berkshire Hathaway exemplified this approach, with Warren Buffett using insurance float and strategic acquisitions to compound wealth over decades Forbes.