Brendan McDermid/Reuters
- The Nasdaq has outperformed the S&P 500 to start the year by a significant margin.
- But historical data cited by DataTrek Research suggests the tech sector could slip soon.
- When the Nasdaq beats the S&P 500 by 5 points or more over 50 days, underperformance has followed.
The Nasdaq has more than doubled the gains of the S&P 500 to start the year, but a key historical pattern suggests there's reason to be cautious on the tech-heavy index moving forward, according to DataTrek Research.