NASDAQ is a stock exchange and the world's first fully electronic trading system. Currently, NASDAQ lists over 3,000 companies, the majority of which are technology and innovation-focused companies. Its key indices, including the Nasdaq Composite Index and the Nasdaq-100 Index, are widely used to measure the performance of US and global technology stocks. Operated by Nasdaq, Inc., NASDAQ provides not only securities trading but also market data, clearing services, and financial technology support.