As of 2015, some of the richest people on the Forbes 400 list include Microsoft founder Bill Gates, Facebook's CEO Mark Zuckerberg and investor Warren Buffett, according to Forbes. Gates ranks as the highest on the list with a value of $76 billion followed by Buffett with a value of $62 billion, while Zuckerberg ranks seventh with a value of about $40.3 billion. The list requires participants amass at least $1.7 billion for consideration.
Gates left Microsoft in 2008 and stepped down as the company's chairman in 2014, reports Gates Notes. As of 2014, Gates serves as a technology adviser for his company.
Gates focuses on his charity foundation called the Bill & Melinda Gates Foundation. One of the many tasks the organization carries out includes helping the hungry and impoverished, reports the Bill & Melinda Gates Foundation.
Facebook became the largest Internet initial public offering, or IPO, when the company went public on the stock market in 2012, explains Biography.com. Zuckerberg beat Steve Jobs on the Forbes 400 list in 2010 when he ranked higher than him in wealth at approximately $6.9 billion. He also became the youngest CEO to make the Fortune 500 list in 2013.
Buffett amassed his wealth from his company Berkshire Hathaway, notes Forbes. His company is also the owner of several subsidiaries, including Fruit of the Loom, Dairy Queen and Geico.