2. Koch family
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Koch family inherited their wealth mainly from Fred C. Koch, the founder of the Koch Industries. Fred began developing his wealth and founded this oil refinery company after he invented the method for refining heavy oil into gasoline. Koch Industries is the second largest privately held company in the United States according to Forbes. Recent living member of Koch family, Charles G. Koch and David H. Koch, individually hold 42% shares of Koch Industries worth of $40 billion. Along with Koch Industries, the family also owns a non-profit organization called Koch Family Foundation which started with the Fred and Mary Koch Foundation in 1953, and later, included the Charles Koch Foundation, the David H. Koch Charitable Foundation and the Koch Cultural Trust. According to Forbes, the family collectively has $89 billion of fortune.
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