New York - US stocks fell in opening trade on Monday, after surviving last week's extreme China-driven turmoil with net gains.
About 15 minutes into trade, the Dow Jones Industrial Average was down 156.94 points at 16 486.07.
The broader S&P 500 lost 15.03 points at 1 973.84, and the Nasdaq Composite gave up 0.49% at 4 804.74.
Nervousness still pervaded Wall Street after last week's roller-coaster trade, and as some analysts continued to argue that US equities are generally overvalued.
Among the 30 Dow blue chips, only Intel (+0.14%) and UnitedHealth (+ 0.23%) managed gains; United Technologies led the losers column with a 2.5% loss after Barclays analysts downgraded the stock.
ExxonMobil (-2.2%) and Chevron (-1.0%) led a pullback in oil industry shares after crude prices gave up some of their sharp gains last week.
Among gainers, Twitter, who shares have sunk over the past month, advanced 3.0%.