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 January. By comparison, the entire S&P 500 was up 3.16% and the DJIA was up +3.26% over the same period. (For related reading, see How Now, Dow? What Moves The DJIA?)

IN PICTURES: 9 Simple Investing Ratios You Need To Know

January's Best-Performing S&P500 Stocks





Company


% Change


NVIDIA Corporation (Nasdaq:NVDA)


+58.38%


Micron Technology Inc. (NYSE:MU)


+34.78%


Intuitive Surgical, Inc. (Nasdaq:ISRG)


+30.35%


Marathon Oil Corporation (NYSE:MRO)


+23.73%


Weyerhaeuser Co. (NYSE:WY)


+23.67%




January's Worst-Performing S&P500 Stocks









Company


% Change


Monster Worldwide Inc. (NYSE:MWW)


-30.97%


SUPERVALU Inc. (NYSE:SVU)


-23.58%


Tellabs, Inc. (Nasdaq:TLAB)


-21.25%


RadioShack Corp. (NYSE:RSH)


-19.50%


F5 Networks, Inc (Nasdaq:FFIV)


-18.15%



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Tickers in this Article: NVDA, MU, ISRG, MRO, WY, MWW, SVU, TLAB, RSH, FFIV

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