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: Abercrombie & Fitch (NYSE: ANF) jumped 10% in intraday trading today, after the company announced that same-store sales rose 13% in September.

So What: After its sales struggled through the recession, shoppers have returned to Abercrombie & Fitch stores, blowing out analysts' expectation of a 3.6% rise in same-store sales. This is a big win during the crucial back-to-school season, and it outpaced the overall industry's 2.8% rise in same-store sales.

Now What: Investors have seen Abercrombie & Fitch's fortunes go south since 2008, when the company booked $475.7 million in net income. A huge jump in sales like this shows that performance is really turning around; we should see big improvements when results are announced next month. I'm buying a big turnaround for Abercrombie & Fitch, and I think there's plenty of upside to come for this retailer.