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 Littelfuse (Nasdaq: LFUS) jumped 10% briefly this morning after the company increased first-quarter guidance.

So what: Revenue view was increased to $167 million in Q1 from $156 million to $165 million. Earnings per share are now expected to be $0.96 to $0.98, up from $0.83 to $0.97 previously.

Now what: The increased guidance brought in at least one big buyer at the market open, but that exuberance died down quickly as the day wore on. Now trading up 5%, the stock is still very attractive considering the company will easily trounce the $0.89 analysts were expecting this quarter, and the stock was only trading at a forward P/E ratio of 13 before today's news. I think this is a nice buying opportunity and shares will continue to trade higher in the future.

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