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Tickers in this Article: ISIL, CYMI, POWI, CAVM, UTEK, VECO, ASML
The morning has been bad for the market. The Nasdaq is trading down 1%; the S&P 500 has decreased 0.4%; and the Dow has slipped 0.3%.

The Semiconductors sector (XLK) is currently ahead of the overall market, down only 0.9%, and its biggest movers are currently:
CompanyMarket CapPercentage Change
Intersil (Nasdaq:ISIL)$1.03 billion-8.3%
Cymer (Nasdaq:CYMI)$1.59 billion-4%
Power Integrations (Nasdaq:POWI)$896.4 million-3.4%
Cavium (Nasdaq:CAVM)$1.64 billion-3.2%
Ultratech (Nasdaq:UTEK)$840.5 million-2.8%
Veeco Instruments (Nasdaq:VECO)$1.17 billion-2.5%
ASML Holding N.V (Nasdaq:ASML)$22.9 billion-2%
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Slipping 8.3%, Intersil (Nasdaq:ISIL) is currently trading at $7.44 per share. The company's volume for the day so far is 2.8 million shares, 1.9 times the average volume over the last three months. Volume is used to evaluate how meaningful the price movement of a stock is.

Falling 4%, Cymer (Nasdaq:CYMI) is currently at a share price of $49.06. So far today, the company's volume is 198,449 shares. Yesterday, volume was only 169,098 shares. In technical analysis, trading volume is used to determine the strength of a market indicator.

Power Integrations (Nasdaq:POWI) has fallen 3.4% and is currently trading at $30.04 per share. The company's volume is currently 150,554 shares for the day, 0.6 times the average daily volume. Volume is an important indicator because it indicates how significant a price shift is.

Cavium (Nasdaq:CAVM) is trading at $31.97 per share, down 3.2%. So far today, the company's volume is 528,679 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.

Ultratech (Nasdaq:UTEK) is down 2.8% to reach $30.90 per share. With 59,156 shares changing hands so far today, the company's volume is 0.3 times its current three-month average. If a stock price makes a big move up or down, volume lets us know the significance of that move.

Currently trading at $29.15 per share, Veeco Instruments (Nasdaq:VECO) has fallen 2.5%. So far today, 310,308 shares of the company's stock have changed hands. This is about the same trading activity as there was yesterday. Volume is also used as a secondary indicator to help confirm what the price movement is suggesting.

ASML Holding N.V (Nasdaq:ASML) is currently trading at a share price of $54.99, a 2% decline. The company's volume is currently 887,253 shares for the day, 0.3 times the average daily volume. 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.

The Bottom Line The nature of the market is such that stocks will have good days and bad days. Paying close attention to the previous ratios will help you identify key times to adjust your strategy. Keep in mind that all these ratios should be compared against historical numbers and industry information in order to get a more complete picture.

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