The Nasdaq composite has closed at a record high for the first time since the dot-com bubble of 2000.
The index gained 20 points, or 0.4 percent, to close at 5,056 Thursday, beating its previous high by eight points.
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The Dow Jones industrial average rose 20 points, or 0.1 percent, to 18,058.
The Standard & Poor's 500 rose four points, or 0.2 percent, to close at 2,112, just below its own record from last month.
The Nasdaq tracks all stocks listed on the Nasdaq Stock Market, a rival to the New York Stock Exchange.
A lot has changed since the dot-com era, when the index was more heavily weighted with technology and telecom companies. These days, biotechnology and consumer services companies make up significant parts of the index.