The Nasdaq exchange smashed its 15-year-old record Thursday, breaking through the old mark set at the peak of the dot-com boom in 2000.

The Nasdaq Composite Index added 0.41 percent to finish at 5,056.06, finally making up all the nearly 4,000 points lost in a stunning crash that followed the previous mark of 5,048.62 set on March 10, 2000.