Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of technology developer Rambus (Nasdaq: RMBS) were soaring today, gaining as much as 14% in intraday trading.

So what: The jump for Rambus appears to have been driven by new research coverage from small-cap research firm Sidoti & Company, which initiated Rambus at a "buy" and slapped a $10 price target on the stock -- effectively saying it expects the stock to double.

Now what: I'm a broken record when it comes to analyst-driven stock moves. While positive research coverage can be a good reason to tune into a stock, it's important to remember that it's only a single viewpoint. Investors need to make sure they have a good handle on why they're buying and what they think the stock is worth, rather than jamming the buy button solely on the view of a Wall Street analyst.

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Fool contributor Matt Koppenheffer has no financial interest in any of the companies mentioned. You can check out what Matt is keeping an eye on by visiting his CAPS portfolio, or you can follow Matt on Twitter, @KoppTheFool, or on Facebook. The Fool’s disclosure policy prefers dividends over a sharp stick in the eye.