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 RDA Microelectronics (Nasdaq: RDA) are doing their best bottle-rocket impression today, shooting up by as much as 15.7% on moderately heavy trading volume.

So what: This is the second hyperjump in two weeks for RDA, not to mention a 24% gain on its first trading day in mid-November. The company hasn't reported any substantial news all month long, making it easy to chalk another one up for hyperactive year-end trading in little-known Chinese stocks.

Now what: "Hyperactive" is a relative term, of course: Even a total unknown from RDA's neck of the woods such as Spreadtrum Communications (Nasdaq: SPRD) or Noah Education Holdings (NYSE: NED) typically attract three to five times RDA's daily dollar volume. With minuscule market history to examine and nearly no information trickling out of China about the company, RDA is a lottery ticket at best. Even after today's impressive pop, the stock is down by 16.3% from highs seen at the end of November.

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Fool contributor Anders Bylund holds no position in any of the companies discussed here. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool is investors writing for investors.