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Tickers in this Article: CEPH, WDC, IRM, LO, COG, URBN, JDSU, MMI, NKE, BBY
On a day-to-day basis, most stock tend not to have dramatic price movements. However, material news/information that is fundamental to an industry, sector or stock's business does get released periodically. This type of news has the potential to move a stock by several percentage points (in either direction). While it is a measure of prestige, a stock's inclusion into the S&P500 does not protect the stock to downward movements. But even if a stock has already moved, it might still warrant a look. After good news, a stock may increase in value, but this momentum can often continue on for more upside. Likewise, bad news often knocks down a stock's price more than is warranted, causing it to sell at bargain levels until the price moves back up.

Check out which S&P 500 components made the biggest moves in March. By comparison, the entire S&P 500 was down 0.1% and the DJIA was up +0.8% over the same period. (For related reading, see How Now, Dow? What Moves The DJIA?)

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March's Best-Performing S&P500 Stocks

Company
% Change
Cephalon Inc. (Nasdaq:CEPH)
+32.9%
Western Digital Corp. (NYSE:WDC)
+25.3%
Iron Mountain Inc. (NYSE:IRM)
+23.5%
Lorillard, Inc. (NYSE:LO)
+22.9%
Cabot Oil & Gas Corporation (NYSE:COG)
+18.0%

March's Worst-Performing S&P500 Stocks

Company
% Change
Urban Outfitters Inc. (Nasdaq:URBN)
-21.4%
JDS Uniphase Corporation (Nasdaq:JDSU)
-15.0%
Motorola Mobility Holdings, Inc (NYSE:MMI)
-14.0%
Nike Inc. (NYSE:NKE)
-14.0%
Best Buy Co. Inc. (NYSE:BBY) -11.5%
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