Just four Big Tech stocks — Nvidia, Microsoft, Meta, and Broadcom — account for 60 percent of the benchmark index’s total returns so far this year, according to a new analysis from DataTrek Research. They’re also responsible for pushing headline valuation levels to dot-com bubble levels.

Follow all the latest U.S. market action for Tuesday here to see if stocks can shake of some summer torpor and reach fresh highs.

The benchmark S&P 500 index declined for a fourth consecutive day on Aug. 20 and the Nasdaq Composite was dragged lower as mega-cap technology stocks continue to sell off. Take advantage of TipRanks Premium at 50% off!