<alternatetext>World's Richest CEOs </alternatetext> The worlds richest chief executives have all either founded or built companies from the ground up, in many cases transforming their industries. While some of them inherited wealth, most came from modest beginnings. One started as a newspaper boy, another as an insurance salesman, a third as a mortgage broke <alternatetext>10. Aliko Dangote, 55 </alternatetext> Company: Dangote Group Net worth: $11.2 billion Compensation: $16, 510* Billionaire Aliko Dangote is the richest man in Africa, according to Forbes. He is also the founder and CEO of Dangote Group, which owns Nigerias largest listed company by market cap Dangote Cement. <alternatetext>9. Mark Zuckerberg, 27 </alternatetext> Company: Facebook Net worth: $18.1 billion 2011 compensation: $1.49 million At 27-years-old, Mark Zuckerberg is the youngest CEO on the list. As the founder and CEO of the worlds largest social networking website with 845 million monthly users, Zuckerberg is likely to leap up the rankings once Facebook goes public this year. <alternatetext>8. Larry Page, 39 </alternatetext> Company: Google Net worth: $18.3 billion 2010 compensation: $1,786 Google co-founder Larry Page was the companys first CEO, but he stepped aside in 2001 and became President of products. Page returned to the post of Chief Executive last year.