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Tickers in this Article: DF, ERTS, M, NFLX, RRD, CSC, SPLS, BIG, SHLD, GPS
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 May. By comparison, the entire S&P 500 was down -2.11% and the DJIA was down -2.68% over the same period. (For related reading, see How Now, Dow? What Moves The DJIA?)

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May's Best-Performing S&P500 Stocks

% Change
Dean Foods Co. (NYSE:DF)
Electronic Arts Inc. (Nasdaq:ERTS)
Macy\'s Inc. (NYSE:M)
Netflix, Inc. (NYSE:NFLX)
R.R. Donnelley & Sons Company (NYSE:RRD)

May's Worst-Performing S&P500 Stocks

% Change
Computer Sciences Corporation (NYSE:CSC)
Staples, Inc. (Nasdaq:SPLS)
Big Lots Inc. (NYSE:BIG)
Sears Holdings Corporation (Nasdaq:SHLD)
Gap Inc. (NYSE:GPS) -16.52%
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