U.S. stock futures surged late Monday, hitting a 5% "limit up" at one point, following Wall Street's worst day since the 1987 crash. Dow Jones Industrial Average futures ymh20 were last up about 800 points, or 3.9%, while S&P 500 futures esh20 and Nasdaq-100 futures nqh20 were also up more than 3%, suggesting gains when the market opens Tuesday morning. During regular trading, the Dow DJIA, -0.87% plunged nearly 3,000 points, or 12.9%, to settle at 20,188.52, while the S&P 500 index SPX, -1.11% tumbled 324.89 points, or 12%, to end at 2,386.13, and the Nasdaq Composite Index COMP, -1.07% dropped 970.28 points, or 12.3%, to finish at 6,904.59.