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 Delek US Holdings (NYSE: DK) fell 10% today after the company was downgraded by an analyst.

So what: Analysts at Deutsche Bank downgraded shares to a hold rating from a buy rating and put a $16 price target on the stock. Global Hunter Securities also initiated coverage with a buy rating and set a $20 price target.

Now what: Deutsche Bank is going against the grain of most analysts, with Morgan Keegan also having a high $25 price target on the stock. No matter whom you're looking at, with shares trading at $12.30 as I'm writing, the upside looks strong. Shares are trading at just 7.3 times trailing earnings and four times forward earnings estimates.

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