Dow Jones Industrial Average, S&P 500 Eke Out Gains; Nasdaq Composite Ends Lower After Biotech Rally Loses Steam

U.S. stocks closed mildly higher Tuesday, seesawing during most of the trading session as investors continued weighed a looming government shutdown and uncertainties surrounding the health of the global economy. After opening mildly higher, the Dow fell as much as 60 points in morning trading, only to reverse and trade roughly 100 points higher. However, U.S. stocks pared gains in afternoon trading to close slightly higher a day after the Dow Jones Industrial Average plunged 300 points.