It's taken 15 years for the Nasdaq composite index to approach the record high of 5,048 it reached back in March 2000, at the height of the tech-stock boom that would later collapse. Here are some things that have changed since then, in the index and in the U.S.
Biggest company in the index
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2000: Microsoft ($525 billion)
2015: Apple ($759 billion)
Biggest industries in index
2000: Technology, 64.9 percent; Telecommunications, 11.8 percent; consumer services, 7.7 percent.
2015: Technology, 43.3 percent; Consumer services, 20.8 percent; Health Care, 16.1 percent.
Number of tech stocks in the Nasdaq:
In the news
2000: Y2K bug, controversy over Cuban immigrant boy Elian Gonzalez, U.S. Presidential election between George W. Bush and Al Gore. "American Beauty" wins Oscar for Best Picture.
2015: Killings of French cartoonists over depiction of prophet Muhammad; U.S. moves to normalize relations with Cuba; identity of Islamic State militant shown beheading hostages is revealed. "Birdman" wins Oscar for Best Picture.
Index data supplied by Nasdaq.