9. David Koh, income 39.6 billion dollars
Brother Charles David Koch, as mentioned above, is a co-owner of Koch Industries Holding Company and its vice-president. Businessman Capital equaled 39.6 billion dollars on March 2016. David Koch Charitable Foundation donated over $1 billion for various purposes. In 2014, New York Metropolitan Museum of Art named one of its squares on his honor, thereby showing their respect to one of Koch, who donated he money for its reconstruction. Compared to last year brothers suffered a loss in their personal condition, each one of them lost at 3.3 billion dollars.