KEY POINTS
  • Tech is up 28% in 2019 — but Bernstein warns that tech companies, especially high priced stocks, may be getting too expensive as earnings expectations are starting to decline.
  • Apple fell 2% and Juniper 4% on Monday after being downgraded to 'sell' ratings, as the Dow slid more than 100 points.
  • But don't just look at inexpensive value tech stocks, said Adam Parker of Trivariate Capital Management LP on Monday's "Halftime Report." He and Ritholtz Wealth Management's Josh Brown believe the action in tech is in software as a service, enterprise, and cloud.

Rising risks in tech?

Tech is the best performing sector of the year — up 28% so far in 2019 — and is outperforming the S&P 500 by about 7 percentage points, but a number of Wall Street firms are signaling caution.