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 Chinese chip designer Spreadtrum Communications (Nasdaq: SPRD) jumped more than 10% in intraday trading today on higher-than-average volume.

So what: It was unclear exactly what was driving the momentum in Spreadtrum shares. Yesterday, the company announced the release of a single chip that houses four GSM SIM cards, though it seems unlikely that the new product would elicit this much excitement. Investors may also be reacting to the fourth-quarter guidance from key competitor MediaTek, which said its sales would fall 15% to 20% from the third quarter. As MediaTek has been ceding market share to Spreadtrum, investors may suspect that this dour outlook means more gains for Spreadtrum.

Now what: Unless I've missed something, the most likely driver for today's boost looks to be speculation about market share gains. While gobbling up more market share would certainly be a good thing for Spreadtrum, investors may want to wait for actual news before getting too excited.

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