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 Suntech Power Holdings (NYSE: STP) are up significantly today, gaining more than 11% from Friday's close.

So What: British analyst firm Collins Stewart upgraded both Suntech and JinkoSolar Holding (NYSE: JKS) to "buy" from "hold" this morning, sending both stocks skyward. Citing "higher modules prices, a higher Euro and better visibility," the firm set Suntech's target price at $12 per share, about 18% ahead of where the stock stands today.

Now What: Solar power has been a theoretically hot commodity for years, without translating that business strength into matching shareholder returns. If this upgrade is a sign, Suntech is still far from a best-of-breed company: Jinko and 800-pound gorilla First Solar (Nasdaq: FSLR) both crush Suntech's margins, for example. In a rapidly consolidating solar industry, I'm not sure Suntech looks like great buyout bait.

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