$QQQ closed up 1.09 percent on Thursday, September 10, 2015, on 1.21 times normal volume. Note that the stock is in overbought territory based on its Slow Stochastic indicator (14, 3, 3) -- sideways movement or a pullback should not be unexpected.
$QQQ closed up 0.04 percent on Thursday, September 17, 2015, on 1.41 times normal volume. It was able to bounce off of its 200 day moving average, an important long-term support line. It ran into resistance at its 50 day moving average. The price action carved out a bearish shooting star candlestick pattern. That may indicate a downside reversal. Look for price to trade beneath the low of the shooting star for confirmation. Note that the stock is in overbought territory based on its Slow Stochastic indicator (14, 3, 3) -- sideways movement or a pullback should not be unexpected.