Worker ownership plays a significant role in the US economy today. This worker ownership takes on different forms. A large proportion of the US population (close to a fifth) owns stock in the company where they work. Meaningful worker holdings are ubiquitous in high-technology companies such as Google in the Internet area, Microsoft in the software area, Gilead Sciences in biotechnology, and Qualcomm in mobile technology. The most intensive sectors of worker ownership in the US are about 10,000 companies with about 15 million workers with Employee Stock Ownership Plans, where about 4,000 of the firms are majority or 100 per cent worker-owned, and a compact but vibrant and growing sector of about 300 worker co-operatives with about 6,000 members. Much of this chapter is based on our book, The Citizen’s Share, with economist Richard B. Freeman (Blasi, Freeman, and Kruse, 2015: 57–122).