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Tickers in this Article: PRGS, TPCG, NFLX, QLIK, CYMI, SSYS, QCOR
This morning has been rocky for the market. The Nasdaq is trading down 1%; the S&P 500 has decreased 0.5%; and the Dow has slipped 0.3%. Most stocks on the Nasdaq Composite Index are technology and Internet-related, but there are financial, consumer, bio-tech and industrial companies as well.

The biggest movers traded on the NASDAQ so far are:
CompanyMarket CapPercentage Change
Progress (Nasdaq:PRGS)$1.36 billion-13%
TPC Group (Nasdaq:TPCG)$644.8 million+10.9%
Netflix (Nasdaq:NFLX)$3.7 billion+10.6%
Qlik Technologies (Nasdaq:QLIK)$1.64 billion+7.4%
Cymer (Nasdaq:CYMI)$1.59 billion-4.6%
Stratasys (Nasdaq:SSYS)$1.33 billion-4.3%
Questcor Pharmaceuticals (Nasdaq:QCOR)$1.16 billion+3.7%
Broker Summary: TD Ameritrade Thinkorswim

Progress (Nasdaq:PRGS) is at a share price of $18.69 after a sharp decline of 13%. So far today, 1.3 million shares have changed hands. If a stock price moves on high volume, this means that the change is a significant one.

TPC Group (Nasdaq:TPCG) rose a significant 10.9% to reach $45.12 per share. The company's volume for the day so far is 631,835 shares, 9.7 times its average over the past three months. Volume is used to evaluate how meaningful the price movement of a stock is.

After a big jump of 10.6%, Netflix (Nasdaq:NFLX) is trading at $73.62 per share. The company's volume for the day so far is 7.5 million shares. 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.

Qlik Technologies (Nasdaq:QLIK) has increased to a share price of $20.54, a 7.4% rise. At 1.4 million shares, the company's volume so far today is 0.7 times its current daily average. Volume is used to evaluate how meaningful the price movement of a stock is.

Slipping 4.6%, Cymer (Nasdaq:CYMI) is currently trading at $48.76 per share. The company is currently trading a volume of 170,479 shares. Volume indicates the level of interest that investors have in a company at its current price.

After a decline of 4.3%, Stratasys (Nasdaq:SSYS) has hit a share price of $59.70. At 150,648 shares, the company's volume so far today is 0.2 times the current three-month average. In technical analysis, trading volume is used to determine the strength of a market indicator.

Rising 3.7%, Questcor Pharmaceuticals (Nasdaq:QCOR) is currently trading at $20.11 per share. So far today, the company's volume is 3.2 million shares. At this rate, trading activity will likely be down from yesterday when 8.7 million shares changed hands. High volume indicates a lot of investor interest while low volume indicates the opposite.

The Bottom Line On any given day, a particular stock may see positive or negative change in its share price. Paying close attention to the previous ratios will help you identify key times to adjust your strategy. 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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