US stock markets opened higher but were quickly hit by heavy profit-taking. The S&P 500 is now down 45 points, or 0.7%.
The big drag comes from Nvidia, which was trading higher by 3% in the premarket and opened at a higher level after a keynote speech from CEO Jensen Huang yesterday.
A big profit was made at the open and shares are now down 5.5%.
Shares of Tesla are also struggling in falling 4.4% after depreciation.