Have you ever seen a stock you own rise or fall in material fashion even though there's been no news from the company? Often, the driving force in such a situation is a report from a Wall Street analyst. A buy rating can lead to gains while a sell rating (or even a downgrade from a "buy" to "neutral") usually results in a sell-off.

Here's what you should do when you come across this situation in your portfolio.

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Source Fool.com