Koch has published three books detailing his business philosophy, The Science of Success, Market Based Management, and Good Profit. Previously, in October 2012, he was ranked the 6th richest person in the world with an estimated net worth of $34 billion-according to the Bloomberg Billionaires Index -and was ranked 18th on Forbes World's Billionaires list of 2011 (and 4th on the Forbes 400), with an estimated net worth of $25 billion, deriving from his 42% stake in Koch Industries. In February 2014, Koch was ranked 9th richest person in the world by Hurun Report with an estimated net worth of $36 billion.

Koch Industries is the largest privately held company by revenue in the United States, according to Forbes. The businesses produce a wide variety of well-known brands, such as Stainmaster carpet, the Lycra brand of spandex fiber, Quilted Northern tissue, and Dixie Cup. Originally involved exclusively in oil refining and chemicals, Koch Industries now includes process and pollution control equipment and technologies, polymers and fibers, minerals, fertilizers, commodity trading and services, forest and consumer products, and ranching. The brothers inherited the business from their father, Fred C.

Charles and David each owned 42% of the conglomerate. Koch has been co-owner, chairman, and chief executive officer of Koch Industries since 1967, while his late brother David Koch served as executive vice president. As of August 2021, he was ranked as the 20th-richest person in the world on Bloomberg Billionaires Index, with an estimated net worth of $61.1 billion.

Charles de Ganahl Koch ( / k oКЉ k/ born November 1, 1935) is an American billionaire businessman and philanthropist.

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