William Koch net worth: William Kochs net worth is $4 billion dollars which makes him one of the richest people in Florida. William Koch grew up in Indiana, and is the son of Fred Chase Koch, the founder of Koch Industries, one of the most successful oil companies in United States history. Though he and his brothers stood to inherit vast amounts of their father's wealth, they ended up spending almost twenty years in court fighting over who would control that wealth. After initially selling his shares of the company to two of his brothers in 1983 for $1.3 billion, he went to court in an attempt to collect more money. The case was finally settled in 2001. He is a staunch Republican supporter, and has sent checks for as much as $1 million to the Romney campaign. An Old West enthusiast, he purchased the only remaining picture of Billy the Kid for $2.3 million, and had an entire faux ghost town taken from its location in Colorado and reassembled on his ranch at a cost of $3.1 million.