Ey is a global professional services firm that provides consulting, assurance, tax, and transaction advisory services. Founded in 1989, it is one of the "Big Four" accounting firms, alongside Deloitte, KPMG, and PwC. The firm operates in more than 150 countries and employs over 300,000 people, helping clients improve their business performance and manage risks. The name Ey is derived from the surname of one of its founders, Arthur Young. The firm is known for its commitment to building a better working world, focusing on sustainability and innovation. Its diverse range of services supports organizations in navigating complex challenges and achieving their goals.