As of 2015, the wealthiest people in the world include Bill Gates, Carlos Slim Helu, Warren Buffett, Amancio Ortega and Larry Ellison, reports Forbes. Other wealthy individuals in Forbes' billionaire list include Charles Koch, David Koch, Christy Walton, Jim Walton and Liliane Bettencourt. Gates' main source of income is Microsoft, while Helu has accumulated wealth from the telecom industry.
Known for co-founding the software company Microsoft, Gates has been the richest person worldwide for 16 times in the recent 21 years. He's also a reputable philanthropist who established The Bill & Melinda Gates Foundation to improve the quality of life in Africa, provide educational opportunities in the United States and contribute health supplies to various countries. Helu owns significant shares of the wireless carrier America Movil and holds the largest shares of The New York Times.
Buffett owns the diversified holding company Berkshire Hathaway, which is the fourth most valuable public firm in the United States, as of February 2015. Like Gates, Buffett also engages in philanthropic endeavors, having contributed around $23 billion to different foundations.
Ortega, the co-founder of Zara, is the wealthiest retailer across the globe. He has also ventured into the real estate industry in cities such as New York, Miami, Chicago and London. Ellison, the fifth in Forbes' list of world billionaires, obtained his wealth from his database software company Oracle, which he founded in 1977.