In 2004, the company purchased the maker of Lycra and Coolmax fabric, Invista, for $4.2 billion. In 2008, the company’s turn over crossed $100 billion and became America’s second-largest private company. The company has stakes in diverse industries such as in forest and consumer products, fibers and polymers, refineries, pipelines, fertilizer, and chemical technology. It has expanded in 60 countries across the world with over 70,000 workers.
In 2006, he gifted $20 million to the American Museum of Natural History to make the David H. Koch Dinosaur Wing.
In 2007, he contributed $100 million to the Massachusetts Institute of Technology for prostate cancer research. Moreover, he contributed $30 million to the Memorial Sloan–Kettering Cancer Center in New York, $20 million to Johns Hopkins University School of Medicine in Baltimore, $15 million to New York-Presbyterian Hospital Weill Cornell Medical Center and $25 million to the M.D. Anderson Cancer Center in Houston.
David H. Koch has pledged more than $100 million over 10 years to the New York State Theater in Lincoln Center.
In 2009, he contributed $15 million to the National Museum of Natural History in purpose of making the new David H. Koch Hall of Human Origins
He helped by funding the construction of Deerfield Academy’s $68 million state-of-the-art Koch Center for mathematics, science and technology.
He has given $10 million to the American Civil Liberties Union to defeat parts of the USA PATRIOT Act
BusinessWeek’s 2008 listed David Koch among the 50 Top American Givers
According to Forbes Magazine 2011, he is the world’s 18th richest with net worth $25 billion fortune.