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 oil tanker fleet operator Teekay Tankers (NYSE: TNK) refueled today, jumping as much as 11.3% on heavy trading volume.

So what: The shipper got a rare dose of love from Wall Street as Bank of America Merrill Lynch upgraded the stock from a sell to a buy with a generous price target of $12 per share. That's 23% above last night's closing price, and would take the stock back to levels not seen since early February.

Now what: The company has a history of strong cash flows and generous dividends, with an 11% yield fully in class with income-generation favorites BP Prudhoe Bay Royalty Trust and Encore Energy Partners. But those two have also provided positive stock returns over the past year, while Teekay's yield is juiced by a depressed share price. This could be the turning point for Teekay, after which the stock returns to a higher level but loses a bit of that tasty dividend yield in return.

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