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 Montage Technology Group, Ltd. (NASDAQ: MONT) jumped more than 15% Thursday after the company provided encouraging preliminary fourth-quarter revenue results.

So what: Fourth-quarter revenue is now expected to be in the range of $35 million to $35.5 million, significantly exceeding Montage's previous guidance for sales of $32 million to $34 million. Analysts, on average, were modeling Q4 sales of just $33.06 million.

To explain the increase, Montage says it has seen both higher sales of its memory interface solutions, as well as continued growth from its set-top box products in emerging markets like China. Specifically, revenue from set-top boxes and memory interface products are expected to rise sequentially by 10% and 80%, respectively.

Now what: Of course, it's also worth keeping in mind that Montage is working from a relatively small base, but those numbers are impressive no matter how you slice it. As a result, while shares may look relatively expensive trading around 31 times trailing earnings and more than five times sales, I think Montage could still reward patient investors, assuming it can maintain its growth over the long term.