Graf is the owner of Novomatic Group, Europe's largest gaming technology group. The Gumpoldskirchen, Austria-based company's Novomatic AG division has about 2,000 gaming facilities including casinos and slot aracdes. The closely held Novomatic AG had revenue of 3.6 billion euros ($4.1 billion) in 2025.
The majority of Graf's fortune is derived from his ownership of Novomatic, Europe's largest gaming technology group, according to the 2025 company report.
Novomatic AG has about 2,000 gaming facilities and had revenue of 3.6 billion euros ($4.1 billion) in 2025, according to its website. Graf and his family own all of Novomatic, according to company filings.
It's valued using reported financial results and the average enterprise value-to-sales multiples of two publicly traded peers: Brightstar Lottery and Ainsworth Game Technology.
The value of his cash investments is based on an analysis of taxes, dividends and market performance.
Graf was born into a family of meat butchers in 1947, and grew up with his grandparents in Perchtoldsorf, Austria. At age 23, he was named Austria's youngest-ever master butcher by the country's meat industry, and left the family business to begin importing pinball machines from Belgium in 1974. He started Novomatic six years later, developing new types of slot machines by taking advantage of the gambling industry's transition to electronic gaming.
Working from the company's headquarters in the Austrian wine-producing village of Gumpoldskirchen, Graf expanded his gambling business throughout Western Europe over the course of the next three decades. He has built or developed about 20 casinos, 1,500 slot arcades and more than 450 casino, online and mobile gambling games.
The billionaire was picked as Austria's "Man of the Year" by Trend magazine in 2008. He's divorced, a father of three children, and has a collection of about 125 vintage cars.