October’s Best And Worst S&P500 Components

By Investopedia Staff | November 02, 2010 AAA

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 October. By comparison, the entire S&P 500 was up 3.4% and the DJIA was up 3% over the same period. (For related reading, see How Now, Dow? What Moves The DJIA?)

October's Best-Performing S&P500 Stocks

Company %Change Market Cap
King Pharmaceutical(NYSE:KG) +44.15% 3.54B
Monster Worldwide, Inc(NYSE:MWW) +41.14 2.39B
Massey Energy(NYSE:MEE) +32.89% 4.34B
CF Industries Holdings, Inc.(NYSE:CF) +28.25% 8.63B
Wynn Resorts Ltd. (Nasdaq:WYNN) +25.46% 13.49B

October's Worst-Performing S&P500 Stocks


Company %Change Market Cap
Apollo Group Inc (Nasdaq:APOL) -26.3% 5.65B
Marshall & Ilsley Corporation (NYSE:MI) -21.1% 2.98B
First Horizon National Corp. (NYSE:FHN) -18.3% 2.19B
JDS Uniphase Corporation(Nasdaq:JDSU) -15.6% 2.30B
Lexmark International Inc.(NYSE:LXK) -14.0% 3.04B

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