The stock market ... and the Zacks Rank Trading Tool. As of July 19, the largest sector is information technology, which makes up nearly a third (31.9%) of the S&P 500 by market cap.

Regular trading hours for the U.S. stock market, which includes the Nasdaq Stock Market (Nasdaq) and the New York Stock Exchange (NYSE), are 9:30 am to 4 pm, except on stock market holidays ...