William Ingraham 'Bill' Koch (born May 3, 1940) is an American billionaire businessman, sailor, collector, winemaker, and philanthropist. He is the youngest of four sons of Fred C. Koch, founder of Koch Industries, a major energy conglomerate. After graduating from MIT, he joined the family business and co-founded Koch Industries with his brothers, but became embroiled in disputes with his siblings, particularly Charles and David, leading to his departure in 1983 when he sold his 40% stake for over $400 million. He subsequently founded Oxbow Corporation, a diversified energy and commodities trading company headquartered in West Palm Beach, Florida, which became the cornerstone of his independent business empire. Koch is renowned in sailing for skippering the yacht America³ to victory in the 1992 America's Cup, the first U.S. win in 38 years. Beyond business and sports, he owns Koch Family Estates winery in California, producing premium wines, and maintains an extensive collection of Western American art displayed at his Colorado ranch. A vocal critic of his brothers' conservative political activism through Koch Industries, Bill has supported Democratic causes and environmental initiatives, including lawsuits against oil companies for fraud. His philanthropy focuses on education, arts, and youth sports, with notable donations to institutions like the U.S. Olympic Committee. Estimated net worth around $1.8 billion as of 2019, Koch resides in Palm Beach, Florida, and continues to influence networks through his business and advocacy.