Expedia and Other Big Movers on the Nasdaq on December 13, 2012

This morning has been rocky for the market. The Nasdaq is down 0.4%; the S&P 500 has declined 0.3%; and the Dow has decreased 0.2%. The Nasdaq Composite Index is a capitalization-weighted index, with each company weighted in proportion to its market value.

The biggest movers traded on the NASDAQ so far are:

Company	Market Cap	Percentage Change
Allot (Nasdaq:ALLT)	$645.8 million	-13.8%
Infinity Pharmaceuticals (Nasdaq:INFI)	$1.04 billion	+8.2%
Informatica (Nasdaq:INFA)	$2.97 billion	+4.5%
Intercept Pharmaceuticals (Nasdaq:ICPT)	$544.9 million	+4.2%
United (Nasdaq:UTHR)	$2.65 billion	-3.7%
Deckers (Nasdaq:DECK)	$1.35 billion	+3.4%
Expedia (Nasdaq:EXPE)	$8.17 billion	-3.2%

Broker Summary: Charles Schwab Online Brokerage

After a precipitous drop of 13.8%, Allot (Nasdaq:ALLT) is now trading at a share price of $17.32. At 2.1 million shares, the company's volume so far today is which is more trading activity than there was yesterday.

After an increase of 8.2%, Infinity Pharmaceuticals (Nasdaq:INFI) has reached a current price of $28.48. The company's volume for the day so far is two million shares. This is 1.7 times the average volume over the last three months.

Increasing 4.5%, Informatica (Nasdaq:INFA) is trading at $28.77 per share. So far today, the company's volume is two million shares.

Intercept Pharmaceuticals (Nasdaq:ICPT) is currently trading at $34.38 per share, a 4.2% increase. At 11,665 shares, the company's volume so far today is 1.2 times the current daily average.

Currently trading at $50.25 per share, United (Nasdaq:UTHR) has fallen 3.7%. So far today, the company's volume is 374,207 shares.

Deckers (Nasdaq:DECK) is at $39.67 per share after an increase of 3.4%. The company's volume for the day so far is one million shares, 0.4 times the current three-month average.

Expedia (Nasdaq:EXPE) has fallen 3.2% and is currently trading at $58.62 per share. The company's volume for the day so far is 1.1 million shares.

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.