Dow Jones stocks fell further below their 50-day moving average on the stock market today. Nvidia also fell. Warren Buffett bought VeriSign stock.

The main indexes sold off at the open and stayed lower through the close, putting the Santa Claus rally at risk.

The tech-heavy Nasdaq Composite fell 1.58% while the S&P 500 lost 1.12%. The Dow Jones shed 333 points to end the day.

Stocks fell in morning trading Friday as Wall Street closes out a holiday-shortened week. The S&P 500 fell 1.4%, with more than 80% of stocks in the benchmark index losing ground. Still, the index is managing to hold onto a modest gain for the week.