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 special chemicals maker Chemtura (NYSE: CHMT) jumped 10% today, a day after shares plunged.

So what: No news and shares popped after a gloomy outlook yesterday? That's strange.

What's driving shares today is positive earnings news from chemical makers Cytec Industries (NYSE: CYT) and a debt buyback from LyondellBassel (NYSE: LYB). Both popped today, and management made bullish statements about the future.

Now what: Yesterday I said that shares looked like they were trading at an attractive valuation despite cautious comments from management. Now that industry competitors have weighed in with more bullish sentiments, it looks like that's correct and management is just being overly cautious.

The specialty chemicals sector is hot today, and all three of these companies look like they're trading at attractive valuations considering their potential growth.

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This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.