U.S. stock markets opened slightly higher on Monday, reflecting cautious sentiment during a data-heavy week. The Dow Jones rose 51.78 points, or 0.12%, to 44,962.43 shortly after the market opened. The S&P 500 gained 10.73 points, or 0.18%, to reach 6,043.11, briefly hitting an intraday record high before settling at a 0.2% increase. The NASDAQ climbed 46.24 points, or 0.24%, to 19,264.41 at the open and later extended its gains to rise by 1.00% by 3:36 PM. The market movements come amid expectations of significant economic data releases later in the week.