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 chemical manufacturer Georgia Gulf (NYSE: GGC) jumped as much as 14% in intraday trading.

So what: So what? might be more like it. With no news out for Georgia Gulf today, it seems anybody's guess as to why shares are spiking. The stock had slid badly since the company announced earlier in the month that it's restating its financials going back to September of last year, and there's also a fairly sizable short interest on the stock, so today's move could simply be a short-cover-driven rebound from the recent decline.

Now what: Bloomberg today reported that the Chlorine Institute said the operating rate for producers of chlorine and caustic soda -- which includes Georgia Gulf, along with Dow Chemical (NYSE: DOW), Occidental Petroleum (NYSE: OXY), and Olin Corp. (NYSE: OLN) -- fell to 80 in October from 91 in September. No doubt, chemical companies are looking for a rebound after some recession-induced lean times, but investors will want to keep a close eye on whether things continue to move in the right direction.

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