The losses spread to Asia, where Japan’s Nikkei 225 index fell 1.8 per cent and South Korea’s Kospi slid 3.4 per cent on Friday morning. Hong Kong’s Hang Seng benchmark was down 1.8 per cent, and mainland China’s CSI 300 declined 1.4 per cent.

Nvidia reported quarterly results that handily topped Wall Street expectations, sending the stock sharply higher in after-hours trading.

Jarring swings keep rocking Wall Street, and U.S. stocks erased a big morning gain to drop on Thursday as the market remains skittish following weeks of doubts and erratic moves. Nvidia, cryptocurrencies and other areas that had soared with nearly relentless momentum,

The better market mood triggered by Nvidia's barnstorming earnings and outlook is reducing concerns about sharp, and possibly negative, stock market moves. The Cboe Volatility index (VIX), is an option-derived measure of expected S&P 500 moves,

U.S. stocks ended a choppy session higher on Wednesday, bouncing off recent losses as technology stocks rose ahead of Nvidia's quarterly results.

The U.S. stock market swung through another unsettled day of trading, ahead of a couple of crucial tests for Wall Street.