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 U.S. Silica (SLCA -0.23%) jumped as much as 10.7% in early trading on a bullish analyst report.

So what: Analysts at Howard Weil initiated coverage on the stock with an outperform rating today. The analyst set a $19.00 price target for the stock.

Now what: At the Motley Fool, we don't put a lot of credence in analyst upgrades or downgrades; but, sometimes, the market will for a short period of time. That was the case today, but the stock quickly fell back to earth, and is now up just 4.4% on the day. I don't see this as a reason to change your investment thesis today.

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