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: Great Atlantic & Pacific Tea Co. (NYSE: GAP) shares are up nearly 5.2% in afternoon trading on no news. 

So What: The company, which owns the A&P supermarket chain, reported a big quarterly loss last week, roughly double its loss a year ago, as sales continue to decline. Despite the gloom, investors were cheered by the company's progress with its turnaround. Since that report, Great Atlantic & Pacific Tea shares are up 20%.

Now What: Today's pop may reflect continued buying on the positive turnaround news reported last week, but keep an eye out for not yet released news.   

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