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Tickers in this Article: ACOM, VOLC, NFLX, OPEN, ATHN, GHDX, ALXN
After this morning's trading, the Nasdaq is up 0.3%, the S&P 500 has declined 0.2% and the Dow has decreased 0.2%. The Nasdaq Composite Index represents all the stocks that trade on the Nasdaq stock market.

The biggest movers traded on the NASDAQ so far are:
CompanyMarket CapPercentage Change
Ancestry.com (Nasdaq:ACOM)$1.25 billion+7.8%
Volcano (Nasdaq:VOLC)$1.44 billion+7.5%
Netflix (Nasdaq:NFLX)$3.61 billion+6.3%
OpenTable (Nasdaq:OPEN)$985.2 million+5.7%
athenahealth (Nasdaq:ATHN)$2.64 billion-4.1%
Genomic Health (Nasdaq:GHDX)$1.05 billion-3.9%
Alexion Pharmaceuticals (Nasdaq:ALXN)$20.78 billion-3.2%
Broker Summary: OptionsXpress Online Trading Platform

Ancestry.com (Nasdaq:ACOM) has risen 7.8% and is currently trading at $31.46 per share. So far today, the company's volume is 11.1 million shares, above yesterday's volume of 625,607 shares.

Rising 7.5%, Volcano (Nasdaq:VOLC) is currently trading at $28.87 per share. This morning, the company's volume is 1.2 million shares. This is 2.5 times the current daily average.

Netflix (Nasdaq:NFLX) is up 6.3% to reach a current price of $69.07 per share. With 3.6 million shares changing hands so far today, the company's volume is 0.7 times the average volume over the last three months.

Increasing 5.7%, OpenTable (Nasdaq:OPEN) is trading at $46.09 per share. The company is currently trading a volume of 718,502 shares.

athenahealth (Nasdaq:ATHN) has decreased to $70.34 per share, a 4.1% fall. So far today, 296,883 shares have changed hands, on pace to finish the day below yesterday's volume of 3.4 million shares.

After a decline of 3.9%, Genomic Health (Nasdaq:GHDX) has hit a share price of $33.09. So far today, the company's volume is 81,325 shares. This is 0.4 times its current daily average.

At $104.14, Alexion Pharmaceuticals (Nasdaq:ALXN) has slipped 3.2%. The company's volume is currently 1.7 million shares for the day, 1.7 times the current three-month average.

The Bottom Line No matter the economic climate, Wall Street will always have stocks that make major moves each week. Daily stock performance should be weighed against historical performance and put in context of the market overall. 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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