The biggest betting companies in the world include industry giants like Bet365, William Hill, and DraftKings, each offering a wide range of sports betting, casino games, and online gambling services. These companies have established a global presence, leveraging technology to enhance user experience and expand their customer base. With significant investments in marketing and partnerships with sports leagues, they continue to dominate the market. Regulatory changes and the rise of mobile betting have further fueled their growth, making them key players in the ever-evolving landscape of online gambling.