The market is currently down, with the Nasdaq declining 0.2%, the S&P 500 falling 0.4% and the Dow decreasing 0.6%.

The Oil and Gas Operations sector (DIG) is down 2.3%, underperforming the market overall. The current biggest movers in the sector are:

CompanyMarket CapPercentage Change
Tesoro (NYSE:TSO)$5.73 billion-6.4%
Western Refining (NYSE:WNR)$2.39 billion-5.4%
Valero (NYSE:VLO)$17.32 billion-3.7%
HollyFrontier (NYSE:HFC)$8.02 billion-3.1%
Linn (Nasdaq:LINE)$8.27 billion-2.7%
Marathon (NYSE:MPC)$19.33 billion-2.4%
AmeriGas Partners (NYSE:APU)$4.02 billion+2.4%
Broker Summary: E-Trade Financial

Tesoro (NYSE:TSO) is trading at $38.36 per share, down 6.4%. The company's volume is currently 3.9 million shares for the day, 1.1 times its current three-month average. A stock's volume conveys how excited investors are about it.

Falling 5.4%, Western Refining (NYSE:WNR) is currently at a share price of $24.83. So far today, the company's volume is 1.2 million shares. The trading volume for a stock indicates the level of investor interest.

Valero (NYSE:VLO) is down 3.7% to reach $30.23 per share. So far today, the company's volume is 4.4 million shares,. In technical analysis, trading volume is used to determine the strength of a market indicator.

HollyFrontier (NYSE:HFC) is currently trading at a share price of $38.14, a 3.1% decline. This morning, the company's volume is 1.4 million shares. This is consistent with its current daily average. If a stock price makes a big move up or down, volume lets us know the significance of that move.

After a decline of 2.7%, Linn (Nasdaq:LINE) has hit a share price of $40.35. With 884,767 shares changing hands so far today, the company's volume is one times the current three-month average. When a stock price moves up or down, watching the volume is a good way of identifying how significant that shift is.

Marathon (NYSE:MPC) has fallen 2.4% and is currently trading at $55.74 per share. So far today, 1.8 million shares have changed hands. Volume is an important indicator because it indicates how significant a price shift is.

AmeriGas Partners (NYSE:APU) has risen 2.4% to hit a current price of $44.32 per share. So far today, 64,067 shares have changed hands, consistent with the volume from yesterday lighter than yesterday's volume of 146,561 shares. Volume is used to evaluate how meaningful the price movement of a stock is.

The Bottom Line The nature of the market is such that stocks will have good days and bad days. 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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Tickers in this Article: TSO, WNR, VLO, HFC, LINE, MPC, APU

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