The Koch family foundations are a group of charitable foundations in the United States associated with the family of Fred C. Koch. The most prominent of these are the Charles Koch Foundation and the David H. Koch Charitable Foundation, created by Charles Koch and David Koch, two sons of Fred C. Koch who own the majority of Koch Industries, an oil, gas, paper, and chemical conglomerate which is the US's second-largest privately held company. Charles' and David's foundations have provided millions of dollars to a variety of organizations, including libertarian and conservative think tanks. Areas of funding include think tanks, political advocacy, climate change scepticism, higher education scholarships, cancer research, arts, and science.