S&P 500 and Nasdaq futures were down four percent each, appearing to set the stage for a Monday that could further decimate retirement accounts.
US stock futures declined sharply Sunday evening after two sessions of selloffs that wiped away over $5.4 trillion in market value.
Dow Jones Industrial Average futures tumbled 1,531 points, or 4%, with S&P 500 futures and Nasdaq futures also flashing 4% declines.