Julia Koch has an estimated net worth of $81.2 billion as of 2026, making her one of the three wealthiest women on earth. As the widow of David H. Koch, she controls a 42% family stake in Koch Industries, the largest privately held company in the United States by revenue, with more than $125 billion in annual sales across energy, chemicals, manufacturing, and consumer products.
Updated March 2026: According to Forbes’ 2026 Richest Women in the World ranking published March 10, 2026, Julia Koch & family ranked No. 3 with a net worth of $81.2 billion — up from $74.2 billion in the prior year’s ranking. The increase reflects continued strong performance in Koch Industries’ diversified private operations and appreciation in the family’s other asset holdings.
Julia Margaret Flesher was born on April 12, 1962, in Des Moines, Iowa. Her parents owned a furniture store, and the family relocated to Conway, Arkansas when Julia was approximately eight years old, where her parents subsequently operated a clothing store. She earned a bachelor’s degree from the University of Central Arkansas. In 1984, she moved to New York City and took a position as an assistant to renowned fashion designer Adolfo, whose clientele included First Lady Nancy Reagan. That role placed her at the intersection of high society and political circles, setting the stage for her later prominence in New York social life.
Julia Koch’s public profile prior to her 1996 marriage to David H. Koch was modest — she worked in fashion, attended society events, and cultivated relationships in New York’s philanthropic community. Upon marrying David Koch, she became directly connected to one of the most powerful private business empires in American history. Koch Industries, founded by Fred C. Koch and expanded under David and his brother Charles Koch, controls a vast portfolio spanning oil refining, chemicals, fertilizers, paper products, building materials, and consumer brands including Georgia-Pacific, Molex, and Infor.
David Koch died on August 23, 2019, leaving Julia and their three children with a combined 42% ownership stake in Koch Industries — valued at approximately $50 billion at the time of his death, according to Forbes. Julia subsequently became president of the David H. Koch Foundation, which continues to direct philanthropic giving in line with priorities established during David’s lifetime, focusing on medical research, the arts, and education.
In June 2024, the Koch family purchased a 15% stake in BSE Global — the parent company of the Brooklyn Nets NBA franchise and Barclays Center — for approximately $900 million, per multiple reports. This represented the family’s formal entry into professional sports ownership. In October 2025, the family deepened its sports investment by acquiring approximately a 10% stake in the New York Giants NFL franchise, at a valuation of $10 billion — making their investment worth approximately $1 billion — an acquisition approved by the NFL ownership committee.
Julia Koch married David H. Koch on April 27, 1996, at a ceremony attended by New York’s social elite. They had three children together: David Jr. (born 1998), Mary Julia (born 2001), and John (born 2006). Her society debut came at the 1997 Met Gala, which cemented her place in New York City’s upper social circles. David Koch died in August 2019 at age 79 after a long battle with prostate cancer.
Julia Koch serves as president of the David H. Koch Foundation and is a trustee at multiple cultural and medical institutions in New York City. She maintains an active philanthropic presence supporting the Metropolitan Museum of Art, the American Ballet Theatre, Memorial Sloan Kettering Cancer Center, and NYU Langone. The family’s combined lifetime philanthropic giving exceeded $1.2 billion, according to public records cited by Forbes.
Julia Koch’s net worth is $81.2 billion as of March 2026, according to Forbes’ 2026 Richest Women in the World list, which ranked her No. 3 globally. Her net worth increased from $74.2 billion in 2025, driven by appreciation in Koch Industries and her family’s expanding sports investments.
Julia Koch’s fortune derives almost entirely from the 42% ownership stake in Koch Industries that she and her three children inherited upon the death of her husband David H. Koch in 2019. Koch Industries is the largest private company in the United States by revenue, with annual sales exceeding $125 billion across energy, chemicals, manufacturing, and consumer goods. The family has since diversified into sports ownership through stakes in the Brooklyn Nets and the New York Giants.
Yes. The Koch family purchased a 15% stake in BSE Global — parent company of the Brooklyn Nets and Barclays Center — for approximately $900 million in June 2024. In October 2025, the family acquired approximately a 10% stake in the New York Giants at a $10 billion team valuation, a deal formally approved by the NFL’s ownership committee.