article_snippet: Bill Gates - Microsoft, $79.2 bn .
article_snippet: Carlos Slim Helu -  telecoms, $77.1bn .
article_snippet: Warren Buffet - investor, $72.7bn .
article_snippet: Larry Ellison - Oracle, $54.3 bn .
article_snippet: Charles Koch - various
article_snippet: David Koch - various, $42.9 bn .
article_snippet: Christy Walton -  Walmart, $41.7 bn .
article_snippet: Jim Walton - Walmart, $40.6 bn .
article_snippet: Mark Zuckerberg, 30 - Facebook, $33.4bn .
article_snippet: Dustin Moskovitz, 30 - Facebook, $7.9bn .
article_snippet: Tom Persson, 30 - H&M, $3bn . 5.
article_snippet: Nathan Blecharczyk, 31 - Airbnb, $1.9bn .
article_snippet: Evan Spiegel, 24 - Snapchat, $1.5bn .
article_snippet: Bobby Murphy, 25 - Snapchat, $1.5bn .