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 and railroad tie manufacturer Koppers Holdings (NYSE: KOP) shot up more than 10% after a pair of Wall Street banks offered some bullish views.

So what: Koppers has two primary business lines: selling carbon materials and chemicals to customers like Alcoa (NYSE: AA) and manufacturing railroad ties for customers like CSX Corp (NYSE: CSX). These are both businesses that catch a definite tailwind when the economy is chugging along, and analysts at both Oppenheimer and Jefferies seem to think that there's a breeze building behind the company. Oppenheimer initiated Koppers shares with an "outperform" rating, while Jefferies boosted its rating on the stock from "hold" to "buy."

Now what: Unlike war, I'm won't say that analyst upgrades are good for absolutely nothing. A negative analyst view can be a good reason to take a closer look at a stock you own, while a positive note can bring a stock to your attention that you might not have otherwise paid mind. However, an analyst's positive (or negative) outlook is no replacement for doing your own research. Koppers has a solid business that has produced attractive returns on capital, good cash flow, and pays a decent dividend. Thank Oppenheimer and Jefferies for bringing it to your attention, but buy because of the business fundamentals, not because they said so.

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Fool contributor Matt Koppenheffer does not own shares of any of the companies mentioned. You can check out what Matt is keeping an eye on by visiting his CAPS portfolio, or you can follow Matt on Twitter @KoppTheFool or on his RSS feed. The Fool’s disclosure policy assures you no Wookiees were harmed in the making of this article.