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Tickers in this Article: NFLX, KMX, GPI, BT, CBD, GNC, AN
On a bad day for the market, the Nasdaq has slipped 1%, the S&P 500 has fallen 0.5% and the Dow is trading down 0.3%.

The Services sector (IYC) is down 0.3%, outperforming the market overall. Currently, the biggest movers in the sector are:
CompanyMarket CapPercentage Change
Netflix (Nasdaq:NFLX)$3.7 billion+10.6%
CarMax (NYSE:KMX)$6.67 billion+9.3%
Group one Automotive (NYSE:GPI)$1.44 billion+3.6%
BT Group plc (NYSE:BT)$30.66 billion-3.3%
Companhia Brasileira de Distrib (NYSE:CBD)$12.32 billion+2.8%
GNC Holdings (NYSE:GNC)$4.17 billion+2.6%
AutoNation (NYSE:AN)$5.62 billion+2.4%
Broker Summary: OptionsXpress Online Trading Platform

Netflix (Nasdaq:NFLX) is currently at $73.62 per share after a dramatic increase of 10.6%. The company's volume is currently 7.5 million shares for the day, 1.3 times the current daily average. If a stock price moves on high volume, this means that the change is a significant one.

Increasing 9.3%, CarMax (NYSE:KMX) is trading at $31.91 per share. So far today, the company's volume is 5.5 million shares. In technical analysis, trading volume is used to determine the strength of a market indicator.

After rising 3.6%, Group one Automotive (NYSE:GPI) is currently trading at a share price of $65.47. The company's volume for the day so far is 173,529 shares, 0.7 times the average volume over the last three months. If a stock is trading on low volume, then there is not much interest in the stock. On the other hand, if a stock is trading on high volume, then there is a lot of interest in the stock.

Falling 3.3%, BT Group plc (NYSE:BT) is currently at a share price of $36.36. So far today, 74,295 shares of the company's stock have changed hands. This is on pace to fall short of yesterday's volume of 575,596 shares. If a stock price makes a big move up or down, volume lets us know the significance of that move.

Companhia Brasileira de Distrib (NYSE:CBD) is at $48.14 per share after an increase of 2.8%. So far today, the company's volume is 125,506 shares, in line with the current daily average. As a stock moves up or down, it is important to pay attention to the trading volume. This indicates the level of interest: the higher the volume, the more the interest.

GNC Holdings (NYSE:GNC) has increased to a share price of $40.70, a 2.6% rise. So far today, 1.1 million shares have changed hands. Volume is also used as a secondary indicator to help confirm what the price movement is suggesting.

AutoNation (NYSE:AN) is currently trading at $47.64 per share, a 2.4% increase. With 346,345 shares changing hands so far today, the company's volume is in keeping with its current three-month average. Volume is an important indicator in technical analysis as it is used to measure the worth of a market move. If the markets have made a strong price move either up or down the perceived strength of that move depends on the volume for that period. The higher the volume during that price move the more significant the move.

The Bottom Line No matter the economic climate, Wall Street will always have stocks that make major moves each week. It is important to weigh current activity against historical performance when making any investment decisions. Tools like valuation ratios and profit margins, however, are only as useful as the context you put them in; remember to take historical data and competitor performance into account.

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